US3875341A
Expired / Lapsed
US
⏱️ 0.0 years remaining
System for transferring wideband sound signals
Assignee: Nokia Deutschland GmbH
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Filing: 1973-02-22
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Granted: 1975-04-01
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Expires: 1993-02-22
Abstract
Abstract A system for transferring sound signals is described with which broad-band sound signals can be transferred over a much more narrow-band transfer path between pick-up and reproduction equipment. Starting from ear-physiological findings, the system proposes to transfer only a particular lower frequency range in original form, and of the upper frequency range only amplitude information of individual subranges. At the place of reproduction, the signal of the upper frequency range is then reproduced synthetically with the aid of the amplitude information.
Inventors
- 👤 Gerhard Gunter Gassmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 00:48
CPC Classifications
G; G10; G10L; G10L21/00; G10L21/02; G10L21/038; H; H04; H04B; H04B1/00; H04B1/66; H04B1/667
Claims Analysis
Total Claims: 41
Claim 1
Independent Claim
99 words
A transmitter for transferring wideband sound signals over a narrow frequency range, comprising: means for receiving the sound signals; means for dividing the received sound signals into a lower frequency range and a plurality of higher frequency ranges; means for providing amplitude signals corresponding to the amplitudes of the signals in each of the higher frequency ranges; means for providing a pilot frequency signal; means for sequentially modulating the pilot frequency signal with the amplitude signals of the higher frequency ranges; and means for transferring the signals of the lower frequency range and the sequentially modulated pilot frequency signal.
Claim 2
Dependent Claim
99 words
A transmitter for transferring wideband sound signals over a narrow frequency range, comprising: means for receiving the sound signals; means for dividing the received sound signals into a lower frequency range and a plurality of higher frequency ranges; means for providing amplitude signals corresponding to the amplitudes of the signals in each of the higher frequency ranges; means for providing a pilot frequency signal; means for sequentially modulating the pilot frequency signal with the amplitude signals of the higher frequency ranges; and means for transferring the signals of the lower frequency range and the sequentially modulated pilot frequency signal.
Claim 3
Dependent Claim
125 words
A receiver for use in a system having a transmitter of the type that transfers lower frequency range sound signals directly and a pilot frequency signal sequentially modulated by amplitude signals corresponding to amplitudes of the sound signals in a predetermined number of higher frequency ranges, said receiver comprising: means for receiving and demodulating the sequentially modulated pilot frequency signal to provide sequential amplitude signals corresponding to the amplitudes of the signals in the higher frequency ranges; means for providing synthetic signals having frequeNcies approximately equal to the mid-range frequency of each higher frequency range; means for modulating each synthetic signal with the appropriate amplitude signal; and means for receiving and reproducing the modulated synthetic signals and the directly transferred lower frequency range sound signals.
Claim 4
Dependent Claim
125 words
A receiver for use in a system having a transmitter of the type that transfers lower frequency range sound signals directly and a pilot frequency signal sequentially modulated by amplitude signals corresponding to amplitudes of the sound signals in a predetermined number of higher frequency ranges, said receiver comprising: means for receiving and demodulating the sequentially modulated pilot frequency signal to provide sequential amplitude signals corresponding to the amplitudes of the signals in the higher frequency ranges; means for providing synthetic signals having frequeNcies approximately equal to the mid-range frequency of each higher frequency range; means for modulating each synthetic signal with the appropriate amplitude signal; and means for receiving and reproducing the modulated synthetic signals and the directly transferred lower frequency range sound signals.
Claim 5
Independent Claim
182 words
A system for transferring wideband sound signals over a narrow frequency range, comprising: a transmitter including means for receiving the sound signals, means for dividing the received sound signals into a lower frequency range and a plurality of higher frequency ranges, means for providing amplitude signals corresponding to the amplitudes of the signals in each of the higher frequency ranges, means for providing a pilot frequency signal, means for sequentially modulating the pilot frequency signal with the amplitude signals of the higher frequency ranges, and means for transferring the signals of the lower frequency range and the sequentially modulated pilot frequency signal, and a receiver including means for receiving and demodulating the sequentially modulated pilot frequency signal to provide sequential amplitude signals corresponding to the amplitudes of the signals in the higher frequency ranges, means for providing synthetic signals having frequencies approximately equal to the mid-range frequency of each higher frequency range, means for modulating each synthetic signal with the appropriate amplitude signal and means for receiving and reproducing the modulated synthetic signals and the directly transferred lower frequency range sound signals.
Claim 6
Independent Claim
182 words
A system for transferring wideband sound signals over a narrow frequency range, comprising: a transmitter including means for receiving the sound signals, means for dividing the received sound signals into a lower frequency range and a plurality of higher frequency ranges, means for providing amplitude signals corresponding to the amplitudes of the signals in each of the higher frequency ranges, means for providing a pilot frequency signal, means for sequentially modulating the pilot frequency signal with the amplitude signals of the higher frequency ranges, and means for transferring the signals of the lower frequency range and the sequentially modulated pilot frequency signal, and a receiver including means for receiving and demodulating the sequentially modulated pilot frequency signal to provide sequential amplitude signals corresponding to the amplitudes of the signals in the higher frequency ranges, means for providing synthetic signals having frequencies approximately equal to the mid-range frequency of each higher frequency range, means for modulating each synthetic signal with the appropriate amplitude signal and means for receiving and reproducing the modulated synthetic signals and the directly transferred lower frequency range sound signals.
Claim 7
Dependent Claim
37 words
A transmitter as described in claim 1, wherein the means for sequentially modulating the pilot frequency signal is synchronized by a standard frequency source that is available at both the transmitting and receiving ends of the system.
Claim 8
Dependent Claim
157 words
A transmitter for transferring wideband sound signals over a narrow frequency range, comprising: means for receiving the sound signals; means for dividing the received sound signals into a lower frequency range and a plurality of higher frequency ranges; means for providing amplitude signals corresponding to the amplitudes of the signals in each of the higher frequency ranges; means for providing a pilot frequency signal; means for sequentially modulating the pilot frequency signal with the amplitude signals of the higher frequency ranges so that the sequential modulation takes place in successive time channels that are repeated cyclically and each cycle includes an additional time channel; means for providing a sync signal corresponding to the repetition rate of the cycles, said sequential modulating means being adapted to modulate the pilot frequency signal with the sync signal during the additional time channel; and means for transferring the signals of the lower frequency range and the sequentially modulated pilot frequency signal.
Claim 9
Dependent Claim
157 words
A transmitter for transferring wideband sound signals over a narrow frequency range, comprising: means for receiving the sound signals; means for dividing the received sound signals into a lower frequency range and a plurality of higher frequency ranges; means for providing amplitude signals corresponding to the amplitudes of the signals in each of the higher frequency ranges; means for providing a pilot frequency signal; means for sequentially modulating the pilot frequency signal with the amplitude signals of the higher frequency ranges so that the sequential modulation takes place in successive time channels that are repeated cyclically and each cycle includes an additional time channel; means for providing a sync signal corresponding to the repetition rate of the cycles, said sequential modulating means being adapted to modulate the pilot frequency signal with the sync signal during the additional time channel; and means for transferring the signals of the lower frequency range and the sequentially modulated pilot frequency signal.
Claim 10
Dependent Claim
184 words
A receiver for use in a system having a transmitter of the type that transfers lower frequency range sound signals directly, a pilot frequency signal sequentially modulated in successive time channels by amplitude signals corresponding to the amplitudes of sound signals in a predetermined number of higher frequency ranges and by a sync signal corresponding to the repetition rate of the sequential modulation of the pilot frequency signal, said receiver comprising: means for receiving and demodulating the sequentially modulated pilot frequency signal to provide sequential amplitude signals corresponding to the amplitudes of the signals in the higher frequency ranges and a sync signal; means for providing synthetic signals having frequencies approximately equal to the mid-range frequency of each higher frequency range; means for modulating each synthetic signal with the appropriate amplitude signal; means for distributing the sequential amplitude signals to the modulating means; means responsive to the sync signal for controlling and synchronizing said distributing means to assure Proper distribution of the sequential amplitude signals; and means for receiving and reproducing the modulated synthetic signals and the directly transferred low frequency range sound signals.
Claim 11
Dependent Claim
184 words
A receiver for use in a system having a transmitter of the type that transfers lower frequency range sound signals directly, a pilot frequency signal sequentially modulated in successive time channels by amplitude signals corresponding to the amplitudes of sound signals in a predetermined number of higher frequency ranges and by a sync signal corresponding to the repetition rate of the sequential modulation of the pilot frequency signal, said receiver comprising: means for receiving and demodulating the sequentially modulated pilot frequency signal to provide sequential amplitude signals corresponding to the amplitudes of the signals in the higher frequency ranges and a sync signal; means for providing synthetic signals having frequencies approximately equal to the mid-range frequency of each higher frequency range; means for modulating each synthetic signal with the appropriate amplitude signal; means for distributing the sequential amplitude signals to the modulating means; means responsive to the sync signal for controlling and synchronizing said distributing means to assure Proper distribution of the sequential amplitude signals; and means for receiving and reproducing the modulated synthetic signals and the directly transferred low frequency range sound signals.
Claim 12
Independent Claim
284 words
A system for transferring wideband sound signals over a narrow frequency range, comprising: a transmitter including means for receiving the sound signals, means for dividing the received sound signals into a lower frequency range and a plurality of higher frequency ranges, means for providing amplitude signals corresponding to the amplitudes of the signals in each of the higher frequency ranges, means for providing a pilot frequency signal, means for sequentially modulating the pilot frequency signal with the amplitude signals of the higher frequency ranges, so that the sequential modulation takes place in successive time channels that are repeated cyclically and each cycle includes an additional time channel, means for providing a sync signal corresponding to the repetition rate of the cycles, and said sequential modulating means being adapted to modulate the pilot frequency signal with the sync signal during the additional time channel, and means for transferring the signals of the lower frequency range and the sequentially modulated pilot frequency signal; and a receiver including means for receiving and demodulating the sequentially modulated pilot frequency signal to provide sequential amplitude signals corresponding to the amplitudes of the signals in the higher frequency ranges and to provide a sync signal in sequence with the amplitude signals, means for providing synthetic signals having frequencies approximately equal to the mid-range frequency of each higher frequency range, means for modulating each synthetic signal with the appropriate amplitude signal, distributing the sequential amplitude signals to the modulating means, means responsive to the sync signal for controlling and synchronizing said distributing means to assure proper distribution of the sequential amplitude signals, and means for receiving and reproducing the modulated synthetic signals and the directly transferred lower frequency range sound signals.
Claim 13
Independent Claim
284 words
A system for transferring wideband sound signals over a narrow frequency range, comprising: a transmitter including means for receiving the sound signals, means for dividing the received sound signals into a lower frequency range and a plurality of higher frequency ranges, means for providing amplitude signals corresponding to the amplitudes of the signals in each of the higher frequency ranges, means for providing a pilot frequency signal, means for sequentially modulating the pilot frequency signal with the amplitude signals of the higher frequency ranges, so that the sequential modulation takes place in successive time channels that are repeated cyclically and each cycle includes an additional time channel, means for providing a sync signal corresponding to the repetition rate of the cycles, and said sequential modulating means being adapted to modulate the pilot frequency signal with the sync signal during the additional time channel, and means for transferring the signals of the lower frequency range and the sequentially modulated pilot frequency signal; and a receiver including means for receiving and demodulating the sequentially modulated pilot frequency signal to provide sequential amplitude signals corresponding to the amplitudes of the signals in the higher frequency ranges and to provide a sync signal in sequence with the amplitude signals, means for providing synthetic signals having frequencies approximately equal to the mid-range frequency of each higher frequency range, means for modulating each synthetic signal with the appropriate amplitude signal, distributing the sequential amplitude signals to the modulating means, means responsive to the sync signal for controlling and synchronizing said distributing means to assure proper distribution of the sequential amplitude signals, and means for receiving and reproducing the modulated synthetic signals and the directly transferred lower frequency range sound signals.
Claim 14
Dependent Claim
30 words
A transmitter as described in claim 5, wherein the time sequence of the amplitude signal modulation of the pilot frequency signal is chosen to cycle from low to high frequencies.
Claim 15
Dependent Claim
202 words
A receiver for use in a system having a transmitter of the type that transfers lower frequency range sound signals directly and a pilot frequency signal sequentially modulated in successive time channels by amplitude signals corresponding to the amplitudes of sound signals in a predetermined number of higher frequency ranges and in an additional time channel by an upper frequency range amplitude signal corresponding to the amplitude of all the sound signals in the higher frequency ranges, said receiver comprising: means for receiving and demodulating the sequentially modulated pilot frequency signal to provide sequential amplitude signals corresponding to the amplitudes of the signals in the higher frequency ranges and an upper frequency range amplitude signal; means for providing synthetic signals having frequencies approximately equal to the mid-range frequency of each higher frequency range; means for modulating each synthetic signal with the appropriate amplitude signal; means for providing a noise signal having a frequency range approximately equal to the total frequency range of the higher frequency ranges; means for modulating the noise signal with the upper frequency range amplitude signal; and means for receiving and reproducing the modulated synthetic signals, the modulated noise signal and the directly transferred low frequency range sound signals.
Claim 16
Dependent Claim
202 words
A receiver for use in a system having a transmitter of the type that transfers lower frequency range sound signals directly and a pilot frequency signal sequentially modulated in successive time channels by amplitude signals corresponding to the amplitudes of sound signals in a predetermined number of higher frequency ranges and in an additional time channel by an upper frequency range amplitude signal corresponding to the amplitude of all the sound signals in the higher frequency ranges, said receiver comprising: means for receiving and demodulating the sequentially modulated pilot frequency signal to provide sequential amplitude signals corresponding to the amplitudes of the signals in the higher frequency ranges and an upper frequency range amplitude signal; means for providing synthetic signals having frequencies approximately equal to the mid-range frequency of each higher frequency range; means for modulating each synthetic signal with the appropriate amplitude signal; means for providing a noise signal having a frequency range approximately equal to the total frequency range of the higher frequency ranges; means for modulating the noise signal with the upper frequency range amplitude signal; and means for receiving and reproducing the modulated synthetic signals, the modulated noise signal and the directly transferred low frequency range sound signals.
Claim 17
Dependent Claim
25 words
A transmitter as described in claim 5, wherein the sync signal modulated on pilot frequency signal lies outside the modulation range of the amplitude signals.
Claim 18
Dependent Claim
32 words
A transmitter as described in claim 5, wherein the sync signal lies beyond the threshold of the modulation peRcentage which corresponds to the amplitude signal equivalent to a zero amplitude sound signal.
Claim 19
Dependent Claim
100 words
A transmitter as described in claim 5, additionally comprising: means for providing a volume compression signal corresponding to the amplitude of the received sound signals; the means for receiving the sound signals additionally includes means for receiving the volume compression signal, said means being responsive to the received signals for compressing the volume of the sound signals; and means for modulating the sync signal with the volume compression signal so that the sync signal amplitude varies in relation to the volume compression, whereby the pilot frequency signal during the additional time channel has an amplitude corresponding to the volume compression.
Claim 20
Dependent Claim
21 words
A transmitter as described in claim 12, wherein the sync signal modulation factor directly corresponds to the amount of volume compression.
Claim 21
Dependent Claim
243 words
A receiver for use in a system having a transmitter of the type that transfers lower frequency range sound signals directly, a pilot frequency signal sequentially modulated in successive time channels by amplitude signals corresponding to the amplitudes of sound signals in a predetermined number of higher frequency ranges and by a sync signal corresponding to the repetition rate of the sequential modulation of the pilot frequency signal, said sync signal being further modulated by an amount corresponding to the volume compression of the received sound signals, said receiver comprising: means for receiving and demodulating the sequentially modulated pilot frequency signal to provide sequential amplitude signals corresponding to the amplitudes of the signals in the higher frequency ranges and a sync signal; means for providing synthetic signals having frequencies approximately equal to the mid-range frequency of each higher frequency range; means for modulating each synthetic signal with the appropriate amplitude signal; means for distributing the sequential amplitude signals to the modulating means; means responsive to the sync signal for controlling and synchronizing said distributing means to assure proper distribution of the amplitude signals; means for receiving and adding the modulated synthetic signals and the directly transferred low frequency range sound signals and for providing a combined output signal; volume expansion means for receiving the combined output signal and the sync signal and for providing a volume expanded output signal in response thereto; and means for receiving and reproducing the volume expanded output signal.
Claim 22
Dependent Claim
243 words
A receiver for use in a system having a transmitter of the type that transfers lower frequency range sound signals directly, a pilot frequency signal sequentially modulated in successive time channels by amplitude signals corresponding to the amplitudes of sound signals in a predetermined number of higher frequency ranges and by a sync signal corresponding to the repetition rate of the sequential modulation of the pilot frequency signal, said sync signal being further modulated by an amount corresponding to the volume compression of the received sound signals, said receiver comprising: means for receiving and demodulating the sequentially modulated pilot frequency signal to provide sequential amplitude signals corresponding to the amplitudes of the signals in the higher frequency ranges and a sync signal; means for providing synthetic signals having frequencies approximately equal to the mid-range frequency of each higher frequency range; means for modulating each synthetic signal with the appropriate amplitude signal; means for distributing the sequential amplitude signals to the modulating means; means responsive to the sync signal for controlling and synchronizing said distributing means to assure proper distribution of the amplitude signals; means for receiving and adding the modulated synthetic signals and the directly transferred low frequency range sound signals and for providing a combined output signal; volume expansion means for receiving the combined output signal and the sync signal and for providing a volume expanded output signal in response thereto; and means for receiving and reproducing the volume expanded output signal.
Claim 23
Dependent Claim
165 words
A system as described in claim 7, wherein the transmitter additionally comprises: means for providing a volume compression signal corresponding to the amplitude of the received sound signals; the means for receiving the sound signals additionally includes means for receiving the volume compression signal said means being responsive to the received signals for compressing the volume of the sound signals; and means for modulating the sync signal with the volume compression signal so that the sync signal amplitude varies in relation to the volume compression whereby the pilot frequency signal during the additional time channel has an amplitude corresponding to the volume compression; and the receiver additionally comprises means for receiving the modulated synthetic signals and the directly transferred low frequency range sound signals and for providing in response thereto a combined output signal; volume expansion means for receiving the combined output signal and the sync signal for providing in response thereto a volume expanded signal; means for receiving and reproducing the volume expanded signal.
Claim 24
Dependent Claim
29 words
A transmitter as described in claim 5, additionally comprising pre-emphasis means for receiving and pre-emphasizing the amplitude signals approximately logarithmically prior to the modulation of the pilot frequency signal.
Claim 25
Dependent Claim
40 words
A system as dEscribed in claim 7, wherein the transmitter includes means for pre-emphasizing approximately logarithmically the amplitude signals prior to the modulation of the pilot frequency signal and the receiver additionally comprises means for de-emphasizing the demodulated amplitude signals.
Claim 26
Dependent Claim
16 words
A transmitter as described in claim 1, wherein the pilot frequency signal is single side-band modulated.
Claim 27
Dependent Claim
68 words
A transmitter as described in claim 1, additionally comprising: second means for receiving the sound signals; means for dividing the sound signals received by the second means into a lower frequency range and an upper frequency range corresponding in bandwidth to the total frequency range of the higher frequency ranges; means providing an upper frequency range amplitude signal; and means for transferring the upper frequency range amplitude signal.
Claim 28
Dependent Claim
96 words
A receiver as described in claim 2, additionally comprising: means for receiving an upper frequency range amplitude signal corresponding to the amplitude of the sound signals in the higher frequency ranges; means for providing a noise signal having a frequency range approximately equal to the total frequency range of the higher frequency ranges; means for modulating the noise signal with the upper frequency range amplitude signal; and means for adding the modulated noise signal to the modulated synthetic signals and the directly transferred lower frequency signal so that reproducing means reproduces the modulated noise signal also.
Claim 29
Dependent Claim
150 words
A system as described in claim 3, wherein the transmitter additionally includes: second means for receiving the sound signals; means for dividing the sound signals received by the second means into a lower frequency range and an upper frequency range corresponding in bandwidth to the total frequency range of the higher frequency ranges; means providing an upper frequency range amplitude signal; means for transferring the upper frequency range amplitude signal; and the receiver additionally comprises means for receiving the upper frequency range amplitude signal; means for providing a noise signal having a frequency range approximately equal to the total frequency range of the higher frequency ranges; means for modulating the noise signal with the upper frequency range amplitude signal; and means for adding the modulated noise signal to the modulated synthetic signals and the directly transferred lower frequency signals so that the reproducing means reproduces the modulated noise signal also.
Claim 30
Dependent Claim
140 words
A transmitter as described in claim 1, wherein the means for sequentially modulating the pilot frequency signal with the amplitude signals is arranged so that the sequential modulation takes place in successive time channels that are repeated cyclically and each cycle includes an additional time channel, said transmitter additionally comprising: second means for receiving the sound signal; means for dividing the sound signals received by the second means into a lower frequency range and an upper frequency range corresponding in bandwidth to the total frequency range of the higher frequency ranges; means for providing an upper frequency range amplitude signal; and said sequential modulating means being adapted to modulate the pilot frequency signal with the upper frequency range amplitude signal during the additional time channel, whereby the upper frequency range amplitude signal is also transmitted by the pilot frequency signal.
Claim 31
Dependent Claim
149 words
A transmitter as described in claim 22, wherein each cycle includes a second additional time channel, said transmitter additionally comprising: means for providing a sync signal corresponding to the repetition rate of the cycles; means for providing a volume compression signal corresponding to the amplitude of the received sound signals; the means for receiving the sound signals additionally including: means for receiving the volume compression signal, sAid means being responsive to the received signals for compressing the volume of the sound signals; means for modulating the sync signal with the volume compression signal so that the sync signal amplitude varies in relation to the volume compression; and said sequential modulating means being adapted to modulate the pilot frequency signal with the modulated sync signal during the second additional time channel whereby the pilot frequency signal has an amplitude corresponding to the volume compression during the second additional time channel.
Claim 32
Dependent Claim
116 words
A receiver as described in claim 9, adapted for use in a system wherein the transferred pilot frequency signal is further modulated in a second additional time channel by a sync signal that has been modulated by a volume compression signal, wherein the receiving and demodulating means also provides a sync signal, said receiver additionally comprising: means for distributing the sequential amplitude signals to the modulating means; means responsive to the sync signal for controlling and synchronizing said distributing means to assure proper distribution to the amplitude signals; and volume expansion means for receiving the modulated pilot frequency signal and the sync signal and for providing a volume expanded modulated pilot frequency signal in response thereto.
Claim 33
Dependent Claim
141 words
In a system for transferring wideband sound signals over a narrow frequency range, a transmitter comprising: means for receiving the sound signals; means for dividing the received sound signals into a lower frequency range and a plurality of higher frequency ranges; means for providing amplitude signals corresponding to the amplitudes of the signals in each of the higher frequency ranges; second means for receiving the sound signals; means for dividing the sound signals received by the second means into a lower frequency range and an upper frequency range corresponding in bandwidth to the total frequency range of the higher frequency ranges; means for providing an upper frequency range amplitude signal corresponding to the amplitude of the signals in the upper frequency range; and means for transmitting the lower frequency range signals, the amplitude signals and the upper frequency range amplitude signal.
Claim 34
Dependent Claim
141 words
In a system for transferring wideband sound signals over a narrow frequency range, a transmitter comprising: means for receiving the sound signals; means for dividing the received sound signals into a lower frequency range and a plurality of higher frequency ranges; means for providing amplitude signals corresponding to the amplitudes of the signals in each of the higher frequency ranges; second means for receiving the sound signals; means for dividing the sound signals received by the second means into a lower frequency range and an upper frequency range corresponding in bandwidth to the total frequency range of the higher frequency ranges; means for providing an upper frequency range amplitude signal corresponding to the amplitude of the signals in the upper frequency range; and means for transmitting the lower frequency range signals, the amplitude signals and the upper frequency range amplitude signal.
Claim 35
Dependent Claim
168 words
In a system for transferring wideband sound signals over a narrow frequency range, wherein a transmitter transmits the lower frequency range signals directly along with amplitude signals corresponding to the amplitudes of sound signals in higher frequency ranges and an upper frequency range amplitude signal corresponding to the amplitude of the signals in an upper frequency range having a bandwidth approximately equal to the total bandwidth of the higher frequency ranges, a receiver comprising: means for providing synthetic signals having frequencies approximately equal to the mid-range frequency of each higher frequency range; means for receiving the transmitted signals; means for modulating each synthetic signal with the appropriate amplitude signal; means for providing a noise signal having a frequency range approximately equal to the total frequency range of the higher frequency ranges; means for modulating the noise signal with the upper frequency range amplitude signal; means for adding the modulated noise signal, the modulated synthetic signals and the lower frequency range signals; and means for reproducing the added signals.
Claim 36
Dependent Claim
168 words
In a system for transferring wideband sound signals over a narrow frequency range, wherein a transmitter transmits the lower frequency range signals directly along with amplitude signals corresponding to the amplitudes of sound signals in higher frequency ranges and an upper frequency range amplitude signal corresponding to the amplitude of the signals in an upper frequency range having a bandwidth approximately equal to the total bandwidth of the higher frequency ranges, a receiver comprising: means for providing synthetic signals having frequencies approximately equal to the mid-range frequency of each higher frequency range; means for receiving the transmitted signals; means for modulating each synthetic signal with the appropriate amplitude signal; means for providing a noise signal having a frequency range approximately equal to the total frequency range of the higher frequency ranges; means for modulating the noise signal with the upper frequency range amplitude signal; means for adding the modulated noise signal, the modulated synthetic signals and the lower frequency range signals; and means for reproducing the added signals.
Claim 37
Dependent Claim
203 words
In a system for transferring wideband sound signals over a narrow frequency range, comprising: a transmitter including means for receiving the sound signals, means for dividing the received sound signals into a lower frequency range and a plurality of higher frequency ranges, means for providing amplitude signals corresponding to the amplitudes of the signals each of the higher frequency ranges, means for providing a plurality of pilot frequency signals, means for positively modulating the pilot frequency signals with thE amplitude signals, and means for transferring the signals of the lower frequency range and the modulated pilot frequency signals; and a receiver including means for providing a plurality of local oscillator signals having frequencies corresponding to the pilot frequency signals of the transmitter, means for receiving the local oscillator signals and the modulated pilot frequency signals and for providing amplitude signals corresponding to the amplitudes of the signals in the high frequency ranges, means for providing a plurality of synthetic signals each having a frequency approximately equal to the mid-range frequency of a higher frequency range, means for modulating each synthetic signal with the appropriate amplitude signal, and means for receiving and reproducing the modulated synthetic signals and the directly transferred low frequency signals.
Claim 38
Dependent Claim
203 words
In a system for transferring wideband sound signals over a narrow frequency range, comprising: a transmitter including means for receiving the sound signals, means for dividing the received sound signals into a lower frequency range and a plurality of higher frequency ranges, means for providing amplitude signals corresponding to the amplitudes of the signals each of the higher frequency ranges, means for providing a plurality of pilot frequency signals, means for positively modulating the pilot frequency signals with thE amplitude signals, and means for transferring the signals of the lower frequency range and the modulated pilot frequency signals; and a receiver including means for providing a plurality of local oscillator signals having frequencies corresponding to the pilot frequency signals of the transmitter, means for receiving the local oscillator signals and the modulated pilot frequency signals and for providing amplitude signals corresponding to the amplitudes of the signals in the high frequency ranges, means for providing a plurality of synthetic signals each having a frequency approximately equal to the mid-range frequency of a higher frequency range, means for modulating each synthetic signal with the appropriate amplitude signal, and means for receiving and reproducing the modulated synthetic signals and the directly transferred low frequency signals.
Claim 39
Dependent Claim
40 words
A transmitter as described in claim 27, wherein said pilot frequency signals have a frequency spacing equal to an integral multiple of the frequency of a standard commonly available frequency source so that a pilot frequency oscillator is not needed.
Claim 40
Dependent Claim
227 words
A system as described in claim 3, wherein the means for sequentially modulating the pilot frequency signal with the amplitude signals is formed and arranged so that the sequential modulation takes place in successive time channels that are repeated cyclically and each cycle includes an additional time channel, said transmitter additionally includes: second means for receiving the sound signals; means for dividing the sound signals received by the second means into a lower frequency range and an upper frequency range of the higher frequency ranges; means providing an upper frequency range amplitude signal; said sequential modulating means being adapted to modulate the pilot frequency signal with the upper frequency range amplitude signal during the additional time channel whereby the upper frequency range amplitude signal is also transmitted on the pilot frequency signal, and the receiving and demodulating means of the receiver is arranged to provide an upper frequency range amplitude signal in sequence with the amplitude signals, said receiver additionally including: means for providing a noise signal having a frequency range approximately equal to the total frequency range of the higher frequency ranges, means for modulating the noise signal with the upper frequency range amplitude signal, and means for adding the modulated noise signal to the modulated synthetic signals and the directly transferred lower frequency signals so that the reproducing means reproduces the modulated noise signal also.
Claim 41
Dependent Claim
223 words
A system as described in claim 29, wherein each cycle includes a second additional time channel, said transmitter additionally comprising: means for providing a sync signal corresponding to the repetition rate of the cycles; means for providing a volume compression signal corresponding to the amplitude of the received sound signals; the means for receiving the sound signals additionally including means for receiving the volume compression signal, said means being responsive to the received signals for compressing the volume of the sound signals; means for modulating the sync signal with the volume compression signal so that the sync signal amplitude varies in relation to the volume compression; said sequential modulating means being adapted to modulate the pilot frequency signal with the modulated sync signal during the second additional time channel whereby the pilot frequency signal has an amplitude corresponding to the volume compression during the second additional time channel, wherein the receiving and demodulating means also provides a sync signal, said receiver additionally comprising: means for distributing the sequential amplitude signals to the modulating means; means responsive to the sync signal for controlling and synchronizing said distributing means to assure proper distribution To the amplitude signals; and volume expansion means for receiving the modulated pilot frequency signal and the sync signal and for providing a volume expanded modulated pilot frequency signal in response thereto.
References Cited (Backward Citations)
US2840639A
Cited
US2957948A
Cited
US3030450A
Cited
US3246084A
Cited
US3139487A
Cited
US3349184A
Cited
US3674939A
Cited
US3696298A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-03-31 | 1978-09-30 | 1979-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-31 | 1982-09-30 | 1983-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-31 | 1986-09-30 | 1987-04-01 | $7700.00 | Window Closed / Lapsed |