US3818151A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for amplifying signal transmission through transmission lines
Assignee: Lorain Products Corp
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Filing: 1973-01-26
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Granted: 1974-06-18
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Expires: 1993-01-26
Abstract
Abstract A circuit for increasing the amplitude of signals transmitted through a two-wire transmission line. Amplifying voltage generating means generates and introduces in series with the transmission line an amplifying voltage that varies in accordance with the signal voltage across the transmission line. Amplifying current generating means generates and introduces in shunt with the transmission line an amplifying current that varies in accordance with the signal current through the transmission line. Gain control means varies the ratio of amplifying voltage to signal voltage and the ratio of amplifying current to signal current, as a function of frequency, to provide frequency compensated gain and impedance matching for each frequency in the band of frequencies to be transmitted through the transmission line.
Inventors
- 👤 C Chambers
- 👤 F Kiko
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:29
CPC Classifications
H; H04; H04B; H04B3/00; H04B3/02; H04B3/04; H03; H03F; H03F3/00; H03F3/62
Claims Analysis
Total Claims: 55
Claim 1
Independent Claim
597 words
In an apparatus for modifying the transmission characteristics of a telEphone transmission line or the like, the combination of, amplifying voltage driver means for generating an amplifying voltage in aiding relationship to a transmitted signal, said voltage driver means having inverting input means, non-inverting input means and output means, amplifying current driver means for generating an amplifying current in aiding relationship to the transmitted signal, said current driver means having inverting input means, non-inverting input means and output means, voltage sensing means for energizing the input means of said voltage driver means with a signal which varies in accordance with the signal voltage across the transmission line, current sensing means for energizing the input means of said current driver means with a signal which varies in accordance with the signal current through the transmission line, means for applying the amplifying voltage at the output means of said voltage driver means in series with the transmission line, means for applying the amplifying current at the output means of said current driver means in shunt with the transmission line, series tank circuit means for peaking the amplitude of said amplifying voltage as a function of frequency, means for connecting said series tank circuit means between said voltage sensing means and the input means of said voltage driver means, shunt tank circuit means for peaking the amplitude of said amplifying current as a function of frequency, means for connecting said shunt tank circuit means between said current sensing means and the input means of said current driver means, series impedance compensating circuit means for controlling the relative amplitudes of the signals at the inverting and non-inverting input means of said voltage driver means as a function of frequency, shunt impedance compensating circuit means for controlling the relative amplitudes of the signals at the inverting and non-inverting input means of said current driver means as a function of frequency, said series and shunt impedance compensating circuit means each including a first compensating branch having an impedance which varies in a first manner with frequency and a second compensating branch having an impedance which varies in a second manner with frequency, means for connecting the first and second compensating branches of said series impedance compensating circuit means between said voltage sensing means and the respective non-inverting and inverting input means of said voltage driver means, means for connecting the first and second compensating branches of said shunt impedance compensating circuit means between said current sensing means and the respective inverting and non-inverting input means of said current driver means, series correcting circuit means for cancelling a portion of the impedance compensating activity of said series impedance compensating circuit means in accordance with the peaking activity of said series tank circuit means, shunt correcting circuit means for cancelling a portion of the impedance compensating activity of said shunt impedance compensating circuit means in accordance with the peaking activity of said shunt tank circuit means, said series and shunt correcting circuit means each including a first cancelling brach having an impedance which varies in said first manner with frequency and a second cancelling branch having an impedance which varies in said second manner with frequency, means for connecting the first and second cancelling branches of said series correcting circuit means between said series tank circuit means and the respective inverting and non-inverting input means of said voltage driver means and means for connecting the first and second cancelling branches of said shunt correcting circuit means between said shunt tank circuit means and the respective non-inverting and inverting input means of said current driver means.
Claim 2
Dependent Claim
597 words
In an apparatus for modifying the transmission characteristics of a telEphone transmission line or the like, the combination of, amplifying voltage driver means for generating an amplifying voltage in aiding relationship to a transmitted signal, said voltage driver means having inverting input means, non-inverting input means and output means, amplifying current driver means for generating an amplifying current in aiding relationship to the transmitted signal, said current driver means having inverting input means, non-inverting input means and output means, voltage sensing means for energizing the input means of said voltage driver means with a signal which varies in accordance with the signal voltage across the transmission line, current sensing means for energizing the input means of said current driver means with a signal which varies in accordance with the signal current through the transmission line, means for applying the amplifying voltage at the output means of said voltage driver means in series with the transmission line, means for applying the amplifying current at the output means of said current driver means in shunt with the transmission line, series tank circuit means for peaking the amplitude of said amplifying voltage as a function of frequency, means for connecting said series tank circuit means between said voltage sensing means and the input means of said voltage driver means, shunt tank circuit means for peaking the amplitude of said amplifying current as a function of frequency, means for connecting said shunt tank circuit means between said current sensing means and the input means of said current driver means, series impedance compensating circuit means for controlling the relative amplitudes of the signals at the inverting and non-inverting input means of said voltage driver means as a function of frequency, shunt impedance compensating circuit means for controlling the relative amplitudes of the signals at the inverting and non-inverting input means of said current driver means as a function of frequency, said series and shunt impedance compensating circuit means each including a first compensating branch having an impedance which varies in a first manner with frequency and a second compensating branch having an impedance which varies in a second manner with frequency, means for connecting the first and second compensating branches of said series impedance compensating circuit means between said voltage sensing means and the respective non-inverting and inverting input means of said voltage driver means, means for connecting the first and second compensating branches of said shunt impedance compensating circuit means between said current sensing means and the respective inverting and non-inverting input means of said current driver means, series correcting circuit means for cancelling a portion of the impedance compensating activity of said series impedance compensating circuit means in accordance with the peaking activity of said series tank circuit means, shunt correcting circuit means for cancelling a portion of the impedance compensating activity of said shunt impedance compensating circuit means in accordance with the peaking activity of said shunt tank circuit means, said series and shunt correcting circuit means each including a first cancelling brach having an impedance which varies in said first manner with frequency and a second cancelling branch having an impedance which varies in said second manner with frequency, means for connecting the first and second cancelling branches of said series correcting circuit means between said series tank circuit means and the respective inverting and non-inverting input means of said voltage driver means and means for connecting the first and second cancelling branches of said shunt correcting circuit means between said shunt tank circuit means and the respective non-inverting and inverting input means of said current driver means.
Claim 3
Dependent Claim
427 words
In an apparatus for modifying the transmission characteristics of a telephone transmission line or the like, the combination of, amplifying volTage driver means for generating an amplifying voltage is aiding relationship to a transmitted signal, said voltage driver means having inverting input means, non-inverting input means and output means, amplifying current driver means for generating an amplifying current in aiding relationship to the transmitted signal, said current driver means having inverting input means, non-inverting input means and output means, voltage sensing means for energizing the input means of said voltage driver means with a signal which varies in accordance with the signal voltage across the transmission line, current sensing means for energizing the input means of said current driver means with a signal which varies in accordance with the signal current through the transmission line, means for applying the ampliyfing voltage at the output means of said voltage driver means in series with the transmission line, means for applying the amplifying current at the output means of said current driver means in shunt with the transmission line, first directional control means for connecting said voltage sensing means to the non-inverting input means of said voltage driver means when dominant signals are transmitted in a first direction through the transmission line and to the inverting input means of said voltage driver means when dominant signals are transmitted in a second direction through the transmission line, second directional control means for connecting said current sensing means to the non-inverting input means of said current driver means when dominant signals are transmitted in said first direction and to the inverting input means of said current driver means when dominant signals are transmitted in said second direction, a plurality of frequency compensating means for varying the amplitudes of the signals at the input means of said driver means, as functions of frequency, to compensate for variations in the attenuation of the transmission line, with frequency, over the band of frequencies to be transmitted, a plurality of impedance compensating means for varying the amplitudes of the signals applied to the input means of said driver means, as functions of frequency, to substantially match the impedance of the apparatus to the impedance of the transmission line, at each frequency in the band of frequencies to be transmitted, a plurality of correcting means for cancelling a controllable portion of the impedance compensating activity of said impedance compensating means, as functions of frequency and in accordance with the signal amplitude variations produced by said frequency compensating means, and thereby affording simultaneous frequency and impedance compensation.
Claim 4
Dependent Claim
427 words
In an apparatus for modifying the transmission characteristics of a telephone transmission line or the like, the combination of, amplifying volTage driver means for generating an amplifying voltage is aiding relationship to a transmitted signal, said voltage driver means having inverting input means, non-inverting input means and output means, amplifying current driver means for generating an amplifying current in aiding relationship to the transmitted signal, said current driver means having inverting input means, non-inverting input means and output means, voltage sensing means for energizing the input means of said voltage driver means with a signal which varies in accordance with the signal voltage across the transmission line, current sensing means for energizing the input means of said current driver means with a signal which varies in accordance with the signal current through the transmission line, means for applying the ampliyfing voltage at the output means of said voltage driver means in series with the transmission line, means for applying the amplifying current at the output means of said current driver means in shunt with the transmission line, first directional control means for connecting said voltage sensing means to the non-inverting input means of said voltage driver means when dominant signals are transmitted in a first direction through the transmission line and to the inverting input means of said voltage driver means when dominant signals are transmitted in a second direction through the transmission line, second directional control means for connecting said current sensing means to the non-inverting input means of said current driver means when dominant signals are transmitted in said first direction and to the inverting input means of said current driver means when dominant signals are transmitted in said second direction, a plurality of frequency compensating means for varying the amplitudes of the signals at the input means of said driver means, as functions of frequency, to compensate for variations in the attenuation of the transmission line, with frequency, over the band of frequencies to be transmitted, a plurality of impedance compensating means for varying the amplitudes of the signals applied to the input means of said driver means, as functions of frequency, to substantially match the impedance of the apparatus to the impedance of the transmission line, at each frequency in the band of frequencies to be transmitted, a plurality of correcting means for cancelling a controllable portion of the impedance compensating activity of said impedance compensating means, as functions of frequency and in accordance with the signal amplitude variations produced by said frequency compensating means, and thereby affording simultaneous frequency and impedance compensation.
Claim 5
Dependent Claim
310 words
In an apparatus for modifying the transmission characteristics of a telephone transmission line or the like, the combination of, amplifying voltage driver means for generating an amplifying voltage in aiding relationship to a transmitted signal, said voltage driver means having input means and output means, amplifying current driver means for generating an amplifying current in aiding relationship to the transmitted signal, said current driver means having input means and output means, voltage sensing means for controlling the signal at the input means of said voltage driver means in accordance with the signal voltage across the transmission line, means for applying the amplifying voltage at the output means of said voltage driver means in series with the transmission line, current sensing means for controlling the signal at the input means of said current driver means in accordance with the signal current through the transmission line, means for applying the amplifying current at the output means of said current driver means in shunt with the transmission line, first and second frequency compensating means for varying the amplitudes of the signals at the input means of said voltage and current driver means, respectively, as functions of frequency, to compensate for the frequency dependent attenuation of the transmission line ovEr the band of frequencies to be transmitted, first and second impedance compensating means for varying the amplitudes of the signals at the input means of said voltage and current driver means, as functions of frequency, to substantially match the impedance of the apparatus to the impedance of the transmission line at each frequency in the band of frequencies to be transmitted, first and second correcting means for varying the amplitudes of the signals at the input means of said voltage and current driver means, as functions of frequency, to coordinate the frequency compensating and impedance compensating activites of said frequency and impedance compensating means.
Claim 6
Dependent Claim
310 words
In an apparatus for modifying the transmission characteristics of a telephone transmission line or the like, the combination of, amplifying voltage driver means for generating an amplifying voltage in aiding relationship to a transmitted signal, said voltage driver means having input means and output means, amplifying current driver means for generating an amplifying current in aiding relationship to the transmitted signal, said current driver means having input means and output means, voltage sensing means for controlling the signal at the input means of said voltage driver means in accordance with the signal voltage across the transmission line, means for applying the amplifying voltage at the output means of said voltage driver means in series with the transmission line, current sensing means for controlling the signal at the input means of said current driver means in accordance with the signal current through the transmission line, means for applying the amplifying current at the output means of said current driver means in shunt with the transmission line, first and second frequency compensating means for varying the amplitudes of the signals at the input means of said voltage and current driver means, respectively, as functions of frequency, to compensate for the frequency dependent attenuation of the transmission line ovEr the band of frequencies to be transmitted, first and second impedance compensating means for varying the amplitudes of the signals at the input means of said voltage and current driver means, as functions of frequency, to substantially match the impedance of the apparatus to the impedance of the transmission line at each frequency in the band of frequencies to be transmitted, first and second correcting means for varying the amplitudes of the signals at the input means of said voltage and current driver means, as functions of frequency, to coordinate the frequency compensating and impedance compensating activites of said frequency and impedance compensating means.
Claim 7
Dependent Claim
265 words
In an apparatus for modifying the transmission characteristics of a telephone transmission line or the like, the combination of, amplifying voltage generating means for generating an amplifying voltage in aiding relationship to a transmitted signal, said voltage generating means having input means and output means, amplifying current generating means for generating an amplifying current in aiding relationship to the transmitted signal, said current generating means having input means and output means, means for applying a signal which varies in accordance with the signal voltage across the transmission line to the input means of said voltage generating means, means for applying the amplifying voltage at the output means of said voltage generating means in series with the transmission line, means for applying a signal which varies in accordance with the signal current through the transmission line to the input means of said current generating means, means for applying the amplifying current at the output means of said current generating means across the transmission line, frequency compensating means for varying the gains of said generating means, as functions of frequency, to provide a composite gain that varies in accordance with the attenuation of the transmission line over the band of frequencies to be transmitted, impedance compensating means for varying the gains of said generating means, as functions of frequency, to match the impedances of the apparatus to the impedances of a transmission line over the band of frequencies to be transmitted, impedance-frequency correcting means for varying the gains of said voltage and current generating means to afford simultaneous frequency and impedance compensating activity by said compensating means.
Claim 8
Dependent Claim
265 words
In an apparatus for modifying the transmission characteristics of a telephone transmission line or the like, the combination of, amplifying voltage generating means for generating an amplifying voltage in aiding relationship to a transmitted signal, said voltage generating means having input means and output means, amplifying current generating means for generating an amplifying current in aiding relationship to the transmitted signal, said current generating means having input means and output means, means for applying a signal which varies in accordance with the signal voltage across the transmission line to the input means of said voltage generating means, means for applying the amplifying voltage at the output means of said voltage generating means in series with the transmission line, means for applying a signal which varies in accordance with the signal current through the transmission line to the input means of said current generating means, means for applying the amplifying current at the output means of said current generating means across the transmission line, frequency compensating means for varying the gains of said generating means, as functions of frequency, to provide a composite gain that varies in accordance with the attenuation of the transmission line over the band of frequencies to be transmitted, impedance compensating means for varying the gains of said generating means, as functions of frequency, to match the impedances of the apparatus to the impedances of a transmission line over the band of frequencies to be transmitted, impedance-frequency correcting means for varying the gains of said voltage and current generating means to afford simultaneous frequency and impedance compensating activity by said compensating means.
Claim 9
Dependent Claim
84 words
An apparatus as set forth in claim 4 in which said amplifying voltage generating means and said amplifying current generating means each have a first operative state in which signals transmitted from a first end of the transmission line are amplified, a second operative state in which signals transmitted from a second end of the transmission line are amplified and which includes means for controlling the operative states of said generating means in accordance with the dominant direction of transmission through the transmission line.
Claim 10
Dependent Claim
65 words
An apparatus as set forth in claim 4 in which said frequency compensating means includes signal peaking means for increasing the gains of said generating means, as functions of frequency, as the frequency of signal transmission rises toward a predetermined frequency and for decreasing the gains of said generating means, as functions of frequency, as the frequency of signal transmission rises above said predetermined frequency.
Claim 11
Dependent Claim
88 words
An apparatus as set forth in claim 4 in which said impedance compensating means includes means for establishing a difference between the gains of said voltage and current generating means, said impedance compensating means being arranged to vary said difference, as a function of frequency and in accordance with the impedances looking in both directions from the apparatus into the transmission line, to effectively match the impedances of the apparatus to the impedances of the transmission line at each frequency in the band of frequencies to be transmitted.
Claim 12
Dependent Claim
88 words
An apparatus as set forth in claim 6 in whiCh said impedance compensating means includes means for establishing a difference between the gains of said voltage and current generating means, said impedance compensating means being arranged to vary said difference, as a function of frequency and in accordance with the impedances looking in both directions from the apparatus into the transmission line, to effectively match the impedances of the apparatus to the impedances of the transmission line at each frequency in the band of frequencies to be transmitted.
Claim 13
Dependent Claim
43 words
An apparatus as set forth in claim 8 in which said impedance-frequency correcting means includes cancelling means for reducing the magnitude of said gain difference, as a function of frequency, in accordance with increases in the gain established by said signal peaking means.
Claim 14
Dependent Claim
235 words
In an apparatus for modifying the transmission characteristics of a telephone transmission line or the like, the combination of amplifying voltage generating means for generating an amplifying voltage in aiding relationship to a signal transmitted over said line, said voltage generating means having input means and output means, amplifying current generating means for generating an amplifying current in aiding relationship to a signal transmitted over said line, said current generating means having input means and output means, means for applying a signal which varies in accordance with the signal voltage across the transmission line to the input means of said voltage generating means, means for applying the amplifying voltage at the output means of said voltage generating means in series with the transmission line, means for applying a signal which varies in accordance with the signal current through the transmission line to the input means of said current generating means, means for applying the amplifying current at the output means of said current generating means in shunt with the transmission line, said generating means each including gainfrequency control means for varying the gains of said generating means, as functions of frequency, to match the impedance of the transmission characteristic modifying apparatus to the impedance of the transmission line and to provide a composite gain that varies in a compensatory manner with the attenuation of the transmission line over the band of frequencies to be transmitted.
Claim 15
Dependent Claim
235 words
In an apparatus for modifying the transmission characteristics of a telephone transmission line or the like, the combination of amplifying voltage generating means for generating an amplifying voltage in aiding relationship to a signal transmitted over said line, said voltage generating means having input means and output means, amplifying current generating means for generating an amplifying current in aiding relationship to a signal transmitted over said line, said current generating means having input means and output means, means for applying a signal which varies in accordance with the signal voltage across the transmission line to the input means of said voltage generating means, means for applying the amplifying voltage at the output means of said voltage generating means in series with the transmission line, means for applying a signal which varies in accordance with the signal current through the transmission line to the input means of said current generating means, means for applying the amplifying current at the output means of said current generating means in shunt with the transmission line, said generating means each including gainfrequency control means for varying the gains of said generating means, as functions of frequency, to match the impedance of the transmission characteristic modifying apparatus to the impedance of the transmission line and to provide a composite gain that varies in a compensatory manner with the attenuation of the transmission line over the band of frequencies to be transmitted.
Claim 16
Dependent Claim
83 words
An apparatus as set forth in claim 10 in which said amplifying voltage generating means and said amplifying current generating means each have a first operative state wherein signals transmitted from a first end of the transmission line are amplified and a second operative state wherein signals transmitted from a second end of the transmission line are amplified, and which includes means for controlling the operative states of said generating means in accordance with the dominant direction of transmission through the transmission line.
Claim 17
Dependent Claim
271 words
In an apparatus for modifying the transmission characteristics of a telephone transmission line or the like, the combination of, amplifying voltage generating means for generating an amplifying voltage in aiding relationship to a transmitted signal, said voltage generating means having input means and output means, amplifying current generating means for generating an amplifying current in aiding relationship to the transmitted signal, said current generating means having input means and output means, means for applying a signal which varies in accordance with the signal voltage across the transmission line to the input means of said voltage generating means, means for applying the amplifying voltage at the output means of said voltage generating means in series with the transmission line, means for applying a signal which varies in accordance with the signal current through the transmission line to the input means of said current generating means, means for applying the amplifying current at the output means of said current generating means in shunt with the transmission line, series frequency compensating means for increasing The amplitude of said amplifying voltage as a function of frequency, as the frequency of signal transmission rises toward a predetermined value and for decreasing the amplitude of said amplifying voltage as a function of frequency, as the frequency of signal transmission rises beyond said predetermined value, shunt frequency compensating means for increasing the amplitude of said amplifying current as a function of frequency, as the frequency of signal transmission rises toward said predetermined value and for decreasing the amplitude of said amplifying current as a function of frequency; as the frequency of signal transmission rises beyond said predetermined value.
Claim 18
Dependent Claim
271 words
In an apparatus for modifying the transmission characteristics of a telephone transmission line or the like, the combination of, amplifying voltage generating means for generating an amplifying voltage in aiding relationship to a transmitted signal, said voltage generating means having input means and output means, amplifying current generating means for generating an amplifying current in aiding relationship to the transmitted signal, said current generating means having input means and output means, means for applying a signal which varies in accordance with the signal voltage across the transmission line to the input means of said voltage generating means, means for applying the amplifying voltage at the output means of said voltage generating means in series with the transmission line, means for applying a signal which varies in accordance with the signal current through the transmission line to the input means of said current generating means, means for applying the amplifying current at the output means of said current generating means in shunt with the transmission line, series frequency compensating means for increasing The amplitude of said amplifying voltage as a function of frequency, as the frequency of signal transmission rises toward a predetermined value and for decreasing the amplitude of said amplifying voltage as a function of frequency, as the frequency of signal transmission rises beyond said predetermined value, shunt frequency compensating means for increasing the amplitude of said amplifying current as a function of frequency, as the frequency of signal transmission rises toward said predetermined value and for decreasing the amplitude of said amplifying current as a function of frequency; as the frequency of signal transmission rises beyond said predetermined value.
Claim 19
Dependent Claim
54 words
An apparatus as set forth in claim 12 in which said frequency compensating means include reactance means for setting the frequencies at which the amplitudes of said amplifying voltages and amplifying currents attain their respective maximums and Q-control means for controlling the slopes of the increasing and decreasing portions of said functions of frequency.
Claim 20
Dependent Claim
244 words
In an apparatus for modifying the transmission characteristics of a telephone transmission line or the like, the combination of, amplifying voltage driver means for generating an amplifying voltage in aiding relationship to the transmitted signal, said voltage driver means having input means and output means, amplifying current driver means for generating an amplifying current in aiding relationship to the transmitted signal, said current driver means having input means and output means, voltage sensing means for controlling the signal at the input means of said voltage driver means in accordance with the signal voltage across the transmission line, means for applying the amplifying voltage at the output means of said voltage driver means in series with the transmission line, current sensing means for controlling the signal at the input means of said current driver means in accordance with the signal current through the transmission line, means for applying the amplifying current at the output means of said current driver means in shunt with the transmission line, series and shunt frequency compensating means for varying the amplitudes of the signals at the input means of said voltage and current driver means, respectively, as functions of frequency, to compensate for variations in the attenuation of the transmission line as a function of frequency, and thereby cause the relative amplitudes of the different frequency components of the transmitted signal to be substantially the same at the receiving end of the transmission line as at the transmitting end thereof.
Claim 21
Dependent Claim
244 words
In an apparatus for modifying the transmission characteristics of a telephone transmission line or the like, the combination of, amplifying voltage driver means for generating an amplifying voltage in aiding relationship to the transmitted signal, said voltage driver means having input means and output means, amplifying current driver means for generating an amplifying current in aiding relationship to the transmitted signal, said current driver means having input means and output means, voltage sensing means for controlling the signal at the input means of said voltage driver means in accordance with the signal voltage across the transmission line, means for applying the amplifying voltage at the output means of said voltage driver means in series with the transmission line, current sensing means for controlling the signal at the input means of said current driver means in accordance with the signal current through the transmission line, means for applying the amplifying current at the output means of said current driver means in shunt with the transmission line, series and shunt frequency compensating means for varying the amplitudes of the signals at the input means of said voltage and current driver means, respectively, as functions of frequency, to compensate for variations in the attenuation of the transmission line as a function of frequency, and thereby cause the relative amplitudes of the different frequency components of the transmitted signal to be substantially the same at the receiving end of the transmission line as at the transmitting end thereof.
Claim 22
Dependent Claim
214 words
In an apparatus for modifying the transmission characteristics of a telephone transmission line or the like, the combination of, amplifying voltage generating means for generating an amplifying voltage in aiding relationship to a transmitted signal, said voltage generating means having input means and output means, amplifying current generating means for generating an amplifying current in aiding relationship to the transmitted signal, said current generating means having input means and output means, means for applying a signal which varies in accordance with the signal voltage across the transmission line to the input means of said voltage generating means, means for applying the amplifying voltage at the output means of said voltage generating means in series with the transmission line, means for applying a signal which varies in accordance with the signal current through the transmission line to the input means of said current generating means, means for applying the amplifying current at the output means of said current generating means in shunt with the transmission line, said generating means each including gain control means for varying the gains of said generating means, as a function of frequency, to provide a composite gain that varies in accordance with the attenuation of the transmission line, over the band of frequencies to be transmitted through the transmission line.
Claim 23
Dependent Claim
214 words
In an apparatus for modifying the transmission characteristics of a telephone transmission line or the like, the combination of, amplifying voltage generating means for generating an amplifying voltage in aiding relationship to a transmitted signal, said voltage generating means having input means and output means, amplifying current generating means for generating an amplifying current in aiding relationship to the transmitted signal, said current generating means having input means and output means, means for applying a signal which varies in accordance with the signal voltage across the transmission line to the input means of said voltage generating means, means for applying the amplifying voltage at the output means of said voltage generating means in series with the transmission line, means for applying a signal which varies in accordance with the signal current through the transmission line to the input means of said current generating means, means for applying the amplifying current at the output means of said current generating means in shunt with the transmission line, said generating means each including gain control means for varying the gains of said generating means, as a function of frequency, to provide a composite gain that varies in accordance with the attenuation of the transmission line, over the band of frequencies to be transmitted through the transmission line.
Claim 24
Dependent Claim
37 words
An apparatus as set forth in claim 15 in which the gains of said voltage and current generating means are substantially equal to one another over the band of frequencies to be transmitted through the transmission line.
Claim 25
Dependent Claim
83 words
An apparatus as set forth in claim 15 in which said amplifying voltage generating means and said amplifying current generating means each have a first operative state wherein signals transmitted from a first end of the transmission line are amplified and a second operative state wherein signals transmitted from a second end of the transmission line are amplified, and which includes means for controlling the operative states of said generating means in accordance with the dominant direction of transmission through the transmission line.
Claim 26
Dependent Claim
253 words
In an apparatus for modifying the transmission characteristics of a telephone transmission line or the like, the combination of, amplifying voltage driver means for generating an amplifying voltage in aiding relationship to a transmitted signal, said voltage driver means having inverting input means, non-inverting input means and output means, amplifying current driver means for generating an amplifying current in aiding relationship to the transmitted signal, said current driver means having inverting input means, non-inverting input means and output means, first impedance compensating means for controlling the signals at the inverting and non-inverting input means of said voltage driver means in accordance with the amplitude and frequency of the signal voltage, means for applying the amplifying voltage at the output means of said voltage driver means in series with the transmission line, second impedance compensating means for controlling the amplitudes of the signals at the inverting and non-inverting input means of said current driver means in accordance with the amplitude and frequency of the signal current through the transmission line, means for applying the amplifying current at the output means of said current driver means in shunt with the transmission line, said first and second impedance compensating means being adapted to vary the difference between the ratio of amplifying voltage to signal voltage and the ratio of amplifying current to signal current, to match the impedances looking in respective first and second directions from the apparatus to the impedances presented by the apparatus, at each frequency in the band of frequencies to be transmitted.
Claim 27
Dependent Claim
253 words
In an apparatus for modifying the transmission characteristics of a telephone transmission line or the like, the combination of, amplifying voltage driver means for generating an amplifying voltage in aiding relationship to a transmitted signal, said voltage driver means having inverting input means, non-inverting input means and output means, amplifying current driver means for generating an amplifying current in aiding relationship to the transmitted signal, said current driver means having inverting input means, non-inverting input means and output means, first impedance compensating means for controlling the signals at the inverting and non-inverting input means of said voltage driver means in accordance with the amplitude and frequency of the signal voltage, means for applying the amplifying voltage at the output means of said voltage driver means in series with the transmission line, second impedance compensating means for controlling the amplitudes of the signals at the inverting and non-inverting input means of said current driver means in accordance with the amplitude and frequency of the signal current through the transmission line, means for applying the amplifying current at the output means of said current driver means in shunt with the transmission line, said first and second impedance compensating means being adapted to vary the difference between the ratio of amplifying voltage to signal voltage and the ratio of amplifying current to signal current, to match the impedances looking in respective first and second directions from the apparatus to the impedances presented by the apparatus, at each frequency in the band of frequencies to be transmitted.
Claim 28
Dependent Claim
51 words
An apparatus as set forth in claim 18 in which said first and second impedance compensating means each comprise reactance means for varying the relative as well as the actual amplitudes of the signals at the inverting and non-inverting input means of the respective driver means, as predetermined functions of frequency.
Claim 29
Dependent Claim
269 words
In an apparatus for modifying the transmission characteristics of a telephone transmission line or the like, the combination of, amplifying voltage driver means for generating an amplifying voltage in aiding relationship to a transmitted signal, said voltage driver means having input means and output means, amplifying current driver means for generating an amplifying current in aiding relationship to the transmitted signal, said current driver means having input means and output means, voltage sensing means for controlling the signal at the input means of said voltage driver means in accordance with the signal voltage across the transmission line, means for applying the amplifying voltage at the output means of said voltage driver means in series with the transmission line, current sensing means for controlling the signal at the input means of said current driver means in accordance with the signal current through the transmission line, means for applying the amplifying current at the output means of said current driver means in shunt with the transmission line, first and second impedance compensating means for varying the amplitudes of the signals at the input means of said voltage and current driver means, respectively, as Functions of frequency, to equalize the impedance of the transmission line and the impedance of the apparatus, at each frequency in the band of frequencies being transmitted through the transmission line, means for connecting said first impedance compensating network between said voltage sensing means and the input means of said amplifying voltage driver means and means for connecting said second impedance compensating network between said current sensing means and the input means of said amplifying current driver means.
Claim 30
Dependent Claim
269 words
In an apparatus for modifying the transmission characteristics of a telephone transmission line or the like, the combination of, amplifying voltage driver means for generating an amplifying voltage in aiding relationship to a transmitted signal, said voltage driver means having input means and output means, amplifying current driver means for generating an amplifying current in aiding relationship to the transmitted signal, said current driver means having input means and output means, voltage sensing means for controlling the signal at the input means of said voltage driver means in accordance with the signal voltage across the transmission line, means for applying the amplifying voltage at the output means of said voltage driver means in series with the transmission line, current sensing means for controlling the signal at the input means of said current driver means in accordance with the signal current through the transmission line, means for applying the amplifying current at the output means of said current driver means in shunt with the transmission line, first and second impedance compensating means for varying the amplitudes of the signals at the input means of said voltage and current driver means, respectively, as Functions of frequency, to equalize the impedance of the transmission line and the impedance of the apparatus, at each frequency in the band of frequencies being transmitted through the transmission line, means for connecting said first impedance compensating network between said voltage sensing means and the input means of said amplifying voltage driver means and means for connecting said second impedance compensating network between said current sensing means and the input means of said amplifying current driver means.
Claim 31
Dependent Claim
57 words
An apparatus as set forth in claim 20 in which the ratio of said amplifying voltage to said signal voltage is maintained at a value substantially equal in magnitude but opposite in sign to the ratio of amplifying current to signal current, at each frequency within the band of frequencies to be transmitted through the transmission line.
Claim 32
Dependent Claim
237 words
In an apparatus for modifying the transmission characteristics of a telephone transmission line or the like, the combination of, series amplifying means having input means and output means, said series amplifying means serving as means for introducing in series with the transmission line a voltage which varies in accordance with the signal voltage across the transmission line, shunt amplifying means having input means and output means, said shunt amplifying means serving as means for introducing in shunt with the transmission line, a current which varies in accordance with the signal current in the transmission line, means for connecting the input means of said series amplifying means in voltage sensing relationship to the transmission line, means for connecting the input means of said shunt amplifying means in current sensing relationship to the transmission line, means for applying the voltage at the output means of said series amplifying means in series with the transmission line, means for applying the current at the output means of said shunt amplifying means in shunt with the transmission line, said series and shunt amplifying means each including gain control means for varying the gains of said series and shunt amplifying means, as functions of frequency, to maintain between said series and shunt amplifying means a gain difference sufficient to match the impedance of the transmission line to the impedance of the apparatus for each frequency within the band of frequencies to be transmitted.
Claim 33
Dependent Claim
237 words
In an apparatus for modifying the transmission characteristics of a telephone transmission line or the like, the combination of, series amplifying means having input means and output means, said series amplifying means serving as means for introducing in series with the transmission line a voltage which varies in accordance with the signal voltage across the transmission line, shunt amplifying means having input means and output means, said shunt amplifying means serving as means for introducing in shunt with the transmission line, a current which varies in accordance with the signal current in the transmission line, means for connecting the input means of said series amplifying means in voltage sensing relationship to the transmission line, means for connecting the input means of said shunt amplifying means in current sensing relationship to the transmission line, means for applying the voltage at the output means of said series amplifying means in series with the transmission line, means for applying the current at the output means of said shunt amplifying means in shunt with the transmission line, said series and shunt amplifying means each including gain control means for varying the gains of said series and shunt amplifying means, as functions of frequency, to maintain between said series and shunt amplifying means a gain difference sufficient to match the impedance of the transmission line to the impedance of the apparatus for each frequency within the band of frequencies to be transmitted.
Claim 34
Dependent Claim
211 words
In an apparatus for modifying the transmission characteristics of a telephone transmission line or the like, the combination of, amplifying voltage generating means for generating an amplifying voltage in aiding relationship to a transmitted signal, said voltage generating means having input means and output means, amplifying current generating means for generating an amplifying current in aiding relationship to the transmitted signal, said current generating means having input means and output means, means for applying a signal which varies in accordance with the signal voltage across the transmission line to the input means of said voltage generating means, means for applying the amplifying voltage at the output means of said voltage generating means in series with the transmission line, means for applying a signal which varies in accordance with the signal current through the transmission line to the input means of said current generating means, means for applying the amplifying current at the output means of said current generating means in shunt with the transmission line, gain control means for varying the gains of said voltage and current generating means as functions of frequency, said functions being selected to substantially match the impedance of the transmission line to the impedance of the modifying apparatus, over the band of frequencies to be transmitted.
Claim 35
Dependent Claim
211 words
In an apparatus for modifying the transmission characteristics of a telephone transmission line or the like, the combination of, amplifying voltage generating means for generating an amplifying voltage in aiding relationship to a transmitted signal, said voltage generating means having input means and output means, amplifying current generating means for generating an amplifying current in aiding relationship to the transmitted signal, said current generating means having input means and output means, means for applying a signal which varies in accordance with the signal voltage across the transmission line to the input means of said voltage generating means, means for applying the amplifying voltage at the output means of said voltage generating means in series with the transmission line, means for applying a signal which varies in accordance with the signal current through the transmission line to the input means of said current generating means, means for applying the amplifying current at the output means of said current generating means in shunt with the transmission line, gain control means for varying the gains of said voltage and current generating means as functions of frequency, said functions being selected to substantially match the impedance of the transmission line to the impedance of the modifying apparatus, over the band of frequencies to be transmitted.
Claim 36
Dependent Claim
57 words
An apparatus as set forth in claim 23 in which the ratio of said amplifying voltage to said signal voltage is maintained at a value substantially equal in magnitude but opposite in sign to the ratio of amplifying current to signal current, at each Frequency within the band of frequencies to be transmitted through the transmission line.
Claim 37
Dependent Claim
118 words
An apparatus as set forth in claim 23 in which said functions of frequency are selected so that the equation: Z10/ Z11 4 + 2 (RB - RA) - RARB/4 - 2 (RB - RA) - RARB is substantially satisfied, where Z10 is the impedance of the transmission line looking in a first direction from the apparatus, as a function of frequency, Z11 is the impedance of the transmission line looking in a second direction from the apparatus, as a function of frequency, RA is the ratio of the amplifying voltage to the signal voltage, as a function of frequency, and RB is the ratio of the amplifying current to the signal current, as a function of frequency.
Claim 38
Independent Claim
210 words
A method of modifying the transmission characteristics of a telephone transmission line or the like comprising the steps of sensing the signal voltage across the transmission line and generating an amplifying voltage which varies in accordance therewith, introducing said amplifying voltage in series with the transmission line, sensing the signal current through the transmission line and generating an amplifying current which varies in accordance therewith, introducing said amplifying current in shunt with the transmission line, varying the ratio of said amplifying voltage to said signal voltage and the ratio of amplifying current to signal current as functions of frequency, to provide a frequency dependent insertion gain which increases with increases in the attenuation of the transmission line, varying the difference between said ratio of amplifying voltage to signal voltage and said ratio of amplifying current to signal current as functions of frequency, to provide a frequency dependent match between the impedances looking in different directions from the point in the transmission line where amplifying voltages and currents are introduced, and reducing the difference between said ratio of amplifying voltage to signal voltage and said ratio of amplifying current to signal current as a function of frequency, to simultaneously provide said frequency dependent insertion gain and said frequency dependent impedance match.
Claim 39
Independent Claim
210 words
A method of modifying the transmission characteristics of a telephone transmission line or the like comprising the steps of sensing the signal voltage across the transmission line and generating an amplifying voltage which varies in accordance therewith, introducing said amplifying voltage in series with the transmission line, sensing the signal current through the transmission line and generating an amplifying current which varies in accordance therewith, introducing said amplifying current in shunt with the transmission line, varying the ratio of said amplifying voltage to said signal voltage and the ratio of amplifying current to signal current as functions of frequency, to provide a frequency dependent insertion gain which increases with increases in the attenuation of the transmission line, varying the difference between said ratio of amplifying voltage to signal voltage and said ratio of amplifying current to signal current as functions of frequency, to provide a frequency dependent match between the impedances looking in different directions from the point in the transmission line where amplifying voltages and currents are introduced, and reducing the difference between said ratio of amplifying voltage to signal voltage and said ratio of amplifying current to signal current as a function of frequency, to simultaneously provide said frequency dependent insertion gain and said frequency dependent impedance match.
Claim 40
Independent Claim
166 words
A method of modifying the transmission characteristics of a telephone transmission line or the like comprising the steps of sensing the signal voltage across the transmission line and generating an amplifying voltage in accordance therewith, introducing said amplifying voltage in series with the transmission line, sensing the signal current through the transmission line and generating an amplifying current in accordance therewith, introducing said amplifying current in shunt with the transmission line, varying the ratio of amplifying voltage to said signal voltage and the ratio of said amplifying current to said signal current as functions of frequency to establish a composite gain which varies in accordance with the attenuation of the transmission line, over the band of frequencies to be transmitted, varying said ratios as functions of frequency to substantially match the impedances looking in both directions at each of the points in the transmission line at which said amplifying voltage and amplifying current are introduced, at each frequency in the band of frequencies to be transmitted.
Claim 41
Independent Claim
166 words
A method of modifying the transmission characteristics of a telephone transmission line or the like comprising the steps of sensing the signal voltage across the transmission line and generating an amplifying voltage in accordance therewith, introducing said amplifying voltage in series with the transmission line, sensing the signal current through the transmission line and generating an amplifying current in accordance therewith, introducing said amplifying current in shunt with the transmission line, varying the ratio of amplifying voltage to said signal voltage and the ratio of said amplifying current to said signal current as functions of frequency to establish a composite gain which varies in accordance with the attenuation of the transmission line, over the band of frequencies to be transmitted, varying said ratios as functions of frequency to substantially match the impedances looking in both directions at each of the points in the transmission line at which said amplifying voltage and amplifying current are introduced, at each frequency in the band of frequencies to be transmitted.
Claim 42
Independent Claim
113 words
A method of modifying the transmission characteristics of a telephone transmission line or the like comprising the steps of sensing a signal voltage across the transmission line and generating an amplifying voltage in accordance therewith, introducing said amplifying voltage in series with the transmission line, sensing a signal current through the transmission line and generating an amplifying current in accordance therewith, introducing said amplifying current in shunt with the transmission line, varying the ratio Ra of said amplifying voltaGe to said signal voltage and the ratio Rb of said amplifying current to said signal current so as to substantially satisfy, for each frequency in the band of frequencies to be transmitted, the relations:
Claim 43
Independent Claim
113 words
A method of modifying the transmission characteristics of a telephone transmission line or the like comprising the steps of sensing a signal voltage across the transmission line and generating an amplifying voltage in accordance therewith, introducing said amplifying voltage in series with the transmission line, sensing a signal current through the transmission line and generating an amplifying current in accordance therewith, introducing said amplifying current in shunt with the transmission line, varying the ratio Ra of said amplifying voltaGe to said signal voltage and the ratio Rb of said amplifying current to said signal current so as to substantially satisfy, for each frequency in the band of frequencies to be transmitted, the relations:
Claim 44
Independent Claim
178 words
A method of modifying the transmission characteristics of a telephone transmission line or the like comprising the steps of sensing the signal voltage across the transmission line and generating an amplifying voltage which varies in accordance therewith, introducing said amplifying voltage in series with the transmission line, sensing the signal current through the transmission line and generating an amplifying current which varies in accordance therewith, introducing said amplifying current in shunt with the transmission line, increasing the voltage ratio of said amplifying voltage to said signal voltage as a function of frequency, as the frequency of said signal voltage increases toward a predetermined frequency and for decreasing said voltage ratio, as a function of frequency, as the frequency of said signal voltage rises above said predetermined frequency, increasing the current ratio of said amplifying current to said signal current, as a function of frequency, as the frequency of said signal current increases toward said predetermined frequency and decreasing said current ratio as a function of frequency, as the frequency of said signal current rises above said predetermined frequency.
Claim 45
Independent Claim
178 words
A method of modifying the transmission characteristics of a telephone transmission line or the like comprising the steps of sensing the signal voltage across the transmission line and generating an amplifying voltage which varies in accordance therewith, introducing said amplifying voltage in series with the transmission line, sensing the signal current through the transmission line and generating an amplifying current which varies in accordance therewith, introducing said amplifying current in shunt with the transmission line, increasing the voltage ratio of said amplifying voltage to said signal voltage as a function of frequency, as the frequency of said signal voltage increases toward a predetermined frequency and for decreasing said voltage ratio, as a function of frequency, as the frequency of said signal voltage rises above said predetermined frequency, increasing the current ratio of said amplifying current to said signal current, as a function of frequency, as the frequency of said signal current increases toward said predetermined frequency and decreasing said current ratio as a function of frequency, as the frequency of said signal current rises above said predetermined frequency.
Claim 46
Independent Claim
130 words
A method of modifying the transmission characteristics of a telephone transmission line or the like comprising the steps of sensing a signal voltage across the transmission line and generating an amplifying voltage in accordance therewith, introducting said amplifying voltage in series with the transmission line, sensing a signal current through the transmission line and generating an amplifying current in accordance therewith, introducing said amplifying current in shunt with the transmission line, varying the ratio of said amplifying current to said signal voltage and the ratio of said amplifying current to said signal current, as functions of frequency, to afford a composite gain as a function of frequency, which is dependent upon the attenuation of the transmission line, as a function of frequency, over the band of frequencies to be transmitted.
Claim 47
Independent Claim
130 words
A method of modifying the transmission characteristics of a telephone transmission line or the like comprising the steps of sensing a signal voltage across the transmission line and generating an amplifying voltage in accordance therewith, introducting said amplifying voltage in series with the transmission line, sensing a signal current through the transmission line and generating an amplifying current in accordance therewith, introducing said amplifying current in shunt with the transmission line, varying the ratio of said amplifying current to said signal voltage and the ratio of said amplifying current to said signal current, as functions of frequency, to afford a composite gain as a function of frequency, which is dependent upon the attenuation of the transmission line, as a function of frequency, over the band of frequencies to be transmitted.
Claim 48
Independent Claim
113 words
A method of modifying the transmission characteristics of a telephone transmission line or the like comprising the steps of sensing a signal voltage across the transmission line and generating an amplifying voltage in accordance therewith, introducing said amplifying voltage in series with the transmission line, sensing a signal current through the transmission line and generating an amplifying current in accordance therewith, introducing said amplifying current in shunt with the transmission line, varying the ratio RA, of said amplifying voltage to said signal voltage and the ratio RB of said amplifying current to said signal current so as to satisfy, for substantially all frequencies in the band of frequencies to be transmitted, the equations:
Claim 49
Independent Claim
113 words
A method of modifying the transmission characteristics of a telephone transmission line or the like comprising the steps of sensing a signal voltage across the transmission line and generating an amplifying voltage in accordance therewith, introducing said amplifying voltage in series with the transmission line, sensing a signal current through the transmission line and generating an amplifying current in accordance therewith, introducing said amplifying current in shunt with the transmission line, varying the ratio RA, of said amplifying voltage to said signal voltage and the ratio RB of said amplifying current to said signal current so as to satisfy, for substantially all frequencies in the band of frequencies to be transmitted, the equations:
Claim 50
Dependent Claim
27 words
The method of claim 31 including the step of maintaining ratio RA substantially equal to ratio RB at each frequency in the band of frequencies being transmitted.
Claim 51
Independent Claim
152 words
A method of modifying the transmission characteristics of a telephone transmission line or the like comprising the steps of sensing a signal voltage across the transmission line and generating an amplifying voltage which varies in accordance therewith, introducing said amplifying voltage in series with the transmission line, sensing a signal current flowing through the transmission line and generating an amplifying current which varies in accordance therewith, introducing said amplifying current in shunt with the transmission line, varying the magnitudes and signs of the ratio of amplifying voltage to signal voltage and the ratio of amplifying current to signal current, as functions of frequency, to establish between said ratios a difference sufficient to match the impedances looking in both directions at each of the places at which amplifying voltage and amplifying current are applied to the transmission line at substantially each frequency within the band of frequencies being transmitted through the transmission line.
Claim 52
Independent Claim
152 words
A method of modifying the transmission characteristics of a telephone transmission line or the like comprising the steps of sensing a signal voltage across the transmission line and generating an amplifying voltage which varies in accordance therewith, introducing said amplifying voltage in series with the transmission line, sensing a signal current flowing through the transmission line and generating an amplifying current which varies in accordance therewith, introducing said amplifying current in shunt with the transmission line, varying the magnitudes and signs of the ratio of amplifying voltage to signal voltage and the ratio of amplifying current to signal current, as functions of frequency, to establish between said ratios a difference sufficient to match the impedances looking in both directions at each of the places at which amplifying voltage and amplifying current are applied to the transmission line at substantially each frequency within the band of frequencies being transmitted through the transmission line.
Claim 53
Independent Claim
169 words
A method of modifying the transmission characteristics of a telephone transmission line or the like comprising the steps of sensing a signal voltage across the transmission line and generating an amplifying voltage which varies in accordance therewith, introducing said amplifying voltage in series with the transmission line, sensing a signal current flowing through the transmission line and generating an amplifying current which varies in accordance therewith, introducing said amplifying current in shunt with the transmission line, and varying the ratio RA of said amplifying voltage to said signal voltage and RB the ratio of said amplifying current to said signal current, with frequency, so as to satisfy, for substantially each frequency in the band of frequencies to be transmitted, the relation: Z10/Z11 4 + 2 (RB - RA) - RARB/4 - 2 (RB - RA) - RARB where Z10 and Z11 are the impedances looking into the transmision line, from the places at which amplifying voltage and amplifying current are applied to the transmission line, as functions of frequency.
Claim 54
Independent Claim
169 words
A method of modifying the transmission characteristics of a telephone transmission line or the like comprising the steps of sensing a signal voltage across the transmission line and generating an amplifying voltage which varies in accordance therewith, introducing said amplifying voltage in series with the transmission line, sensing a signal current flowing through the transmission line and generating an amplifying current which varies in accordance therewith, introducing said amplifying current in shunt with the transmission line, and varying the ratio RA of said amplifying voltage to said signal voltage and RB the ratio of said amplifying current to said signal current, with frequency, so as to satisfy, for substantially each frequency in the band of frequencies to be transmitted, the relation: Z10/Z11 4 + 2 (RB - RA) - RARB/4 - 2 (RB - RA) - RARB where Z10 and Z11 are the impedances looking into the transmision line, from the places at which amplifying voltage and amplifying current are applied to the transmission line, as functions of frequency.
Claim 55
Dependent Claim
32 words
A method as set forth in claim 34 including the step of maintaining RA approximately equal to -RB, at each frequency in the band of frequencies being transmitted through the transmission line.
References Cited (Backward Citations)
US3706862A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-06-17 | 1977-12-17 | 1978-06-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-17 | 1981-12-17 | 1982-06-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-17 | 1985-12-17 | 1986-06-18 | $7700.00 | Window Closed / Lapsed |