US3946162A
Expired / Lapsed
US
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System for transferring wideband sound signals
Assignee: Nokia Deutschland GmbH
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Filing: 1974-05-17
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Granted: 1976-03-23
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Expires: 1994-05-17
Abstract
Abstract A system for transmitting wideband signals, for example speech, over a narrow band is proposed. Lower frequency range signals are directly transmitted and amplitude information of partial upper frequency ranges is transmitted on pilot frequencies. At a receiver, "equivalent" signals from oscillators having frequencies approximately equal to the mid range frequencies of the partial upper frequency ranges are modulated with the amplitude information of the corresponding partial upper frequency ranges to produce "synthetic" signals. The synthetic signals are modulated with narrow band noise to crreate a more pleasing and realistic sound. Means are provided for controlling at the pick-up end the "modulation factor" of the noise modulation at the reproducing end. This is achieved by controlling the level of the third harmonic of a sync signal transmitted from the pick-up end. The level of the third harmonic may be automatically or manually adjusted to conform to the type of sound being transmitted.
Inventors
- 👤 Gerhard-Gunter Gassman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:44
CPC Classifications
H; H04; H04B; H04B1/00; H04B1/66; H04B1/667; G; G10; G10L; G10L21/00; G10L21/02; G10L21/0316; G10L21/0364
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
165 words
A receiver for use in a system having a transmitter of the type that transfers lower frequency range sound signals directly and at least one pilot frequency signal modulated by an amplitude signal corresponding to the amplitude of the sound signals in a higher frequency range, said receiver comprising: means for receiving and demodulating the pilot frequency signal to provide an amplitude signal corresponding to the amplitude of the signal in the higher frequency range; means for providing an equivalent signal having a frequency approximately equal to the mid range frequency of the higher frequency range; means for modulating the equivalent signal with the amplitude signal to provide a synthetic signal; means for dividing the synthetic signal into a pair of quadrature signals; first and second means for providing noise signals; first and second means for modulating the pair of quadrature signals with the noise signals; means for receiving and reproducing the noise modulated quadrature signals and the directly transferred lower frequency range sound signal.
Claim 2
Dependent Claim
165 words
A receiver for use in a system having a transmitter of the type that transfers lower frequency range sound signals directly and at least one pilot frequency signal modulated by an amplitude signal corresponding to the amplitude of the sound signals in a higher frequency range, said receiver comprising: means for receiving and demodulating the pilot frequency signal to provide an amplitude signal corresponding to the amplitude of the signal in the higher frequency range; means for providing an equivalent signal having a frequency approximately equal to the mid range frequency of the higher frequency range; means for modulating the equivalent signal with the amplitude signal to provide a synthetic signal; means for dividing the synthetic signal into a pair of quadrature signals; first and second means for providing noise signals; first and second means for modulating the pair of quadrature signals with the noise signals; means for receiving and reproducing the noise modulated quadrature signals and the directly transferred lower frequency range sound signal.
Claim 3
Dependent Claim
147 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 higher frequency range; means for providing a pilot frequency signal; means for providing a sync signal; means responsive to the sync signal for sequentially sampling said amplitude signals at a repetition rate corresponding to the sync signal; means for reducing a harmonic of the sync signal in accordance with a desired noise modulation factor and for modifying said sync signal; means for modulating the pilot frequency signal with the modified sync signal and the sequentially sampled amplitude signals; and means for transferring the signals of the lower frequency range, and the modulated pilot frequency signal.
Claim 4
Dependent Claim
147 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 higher frequency range; means for providing a pilot frequency signal; means for providing a sync signal; means responsive to the sync signal for sequentially sampling said amplitude signals at a repetition rate corresponding to the sync signal; means for reducing a harmonic of the sync signal in accordance with a desired noise modulation factor and for modifying said sync signal; means for modulating the pilot frequency signal with the modified sync signal and the sequentially sampled amplitude signals; and means for transferring the signals of the lower frequency range, and the modulated pilot frequency signal.
Claim 5
Independent Claim
355 words
A system for transferring and receiving 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 higher frequency range; means for providing a pilot frequency signal; means for providing a sync signal; means responsive to the sync signal for sequentially sampling said amplitude signals at a repetition rate corresponding to the sync signal; means for reducing a harmonic of the sync signal in accordance with a desired noise modulation factor and for modifying said sync signal; means for modulating the pilot frequency signal with the modified sync signal and the sequentially sampled amplitude signals; means for transferring the signals of the lower frequency range and the modulated pilot frequency signal; 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 equivalent signals having frequencies approximately equal to the mid range frequency of each higher frequency range; means for modulating the equivalent signals with the amplitude signals to provide synthetic signals; 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; means responsive to the sync signal for providing a noise modulation factor signal corresponding to the harmonic suppression of the sync signal; means for providing a noise signal; means for attenuating said noise signal in accordance with the noise modulating factor signal so that the noise signal has an amplitude corresponding to the desired noise modulation factor; means for combining said synthetic sound signals and for providing a total synthetic signal; means for modulating the total synthetic signal with the attenuated noise signal and for providing a noise modulated total synthetic signal; and means for receiving and reproducing the noise modulated total synthetic signal and the directly transferred low frequency range sound signal.
Claim 6
Independent Claim
355 words
A system for transferring and receiving 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 higher frequency range; means for providing a pilot frequency signal; means for providing a sync signal; means responsive to the sync signal for sequentially sampling said amplitude signals at a repetition rate corresponding to the sync signal; means for reducing a harmonic of the sync signal in accordance with a desired noise modulation factor and for modifying said sync signal; means for modulating the pilot frequency signal with the modified sync signal and the sequentially sampled amplitude signals; means for transferring the signals of the lower frequency range and the modulated pilot frequency signal; 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 equivalent signals having frequencies approximately equal to the mid range frequency of each higher frequency range; means for modulating the equivalent signals with the amplitude signals to provide synthetic signals; 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; means responsive to the sync signal for providing a noise modulation factor signal corresponding to the harmonic suppression of the sync signal; means for providing a noise signal; means for attenuating said noise signal in accordance with the noise modulating factor signal so that the noise signal has an amplitude corresponding to the desired noise modulation factor; means for combining said synthetic sound signals and for providing a total synthetic signal; means for modulating the total synthetic signal with the attenuated noise signal and for providing a noise modulated total synthetic signal; and means for receiving and reproducing the noise modulated total synthetic signal and the directly transferred low frequency range sound signal.
Claim 7
Dependent Claim
201 words
A receiver for use in a system having a transmitter of the type that transfers lower frequency range sound signals directly and the higher frequency range signals are divided into a plurality of partial higher frequency ranges and amplitude signals corresponding to the amplitudes of the sound signals in the partial higher frequency ranges are transmitted on at least one modulated pilot frequency, said receiver comprising: means for receiving and demodulating the pilot frequency signal to provide amplitude signals corresponding to the amplitudes in the higher frequency ranges; means for providing equivalent signals having frequencies approximately equal to the mid range frequencies of the partial higher frequency ranges; means for modulating the equivalent signals with the amplitude signals to provide synthetic signals; means for dividing each synthetic signal into two components shifted in phase by 90° with respect to each other; means for combining the corresponding components of each synthetic signal; first and second means for providing noise signals; first and second means for modulating the two components of the phase shifted synthetic signals with the first and second noise signals; and means for receiving and reproducing the noise modulated synthetic signals and the directly transferred low frequency range sound signals.
Claim 8
Dependent Claim
201 words
A receiver for use in a system having a transmitter of the type that transfers lower frequency range sound signals directly and the higher frequency range signals are divided into a plurality of partial higher frequency ranges and amplitude signals corresponding to the amplitudes of the sound signals in the partial higher frequency ranges are transmitted on at least one modulated pilot frequency, said receiver comprising: means for receiving and demodulating the pilot frequency signal to provide amplitude signals corresponding to the amplitudes in the higher frequency ranges; means for providing equivalent signals having frequencies approximately equal to the mid range frequencies of the partial higher frequency ranges; means for modulating the equivalent signals with the amplitude signals to provide synthetic signals; means for dividing each synthetic signal into two components shifted in phase by 90° with respect to each other; means for combining the corresponding components of each synthetic signal; first and second means for providing noise signals; first and second means for modulating the two components of the phase shifted synthetic signals with the first and second noise signals; and means for receiving and reproducing the noise modulated synthetic signals and the directly transferred low frequency range sound signals.
Claim 9
Dependent Claim
185 words
A receiver for use in a system having a transmitter of the type that transfers lower frequency range sound signals directly and at least one pilot frequency signal modulated by an amplitude signal corresponding to the amplitude of the sound signals in a higher frequency range and that provides a signal corresponding to a desired noise modulating factor, said receiver comprising: means for receiving and demodulating the pilot frequency signal to provide an amplitude signal corresponding to the amplitude of the signal in the higher frequency range; means for providing an equivalent signal having a frequency approximately equal to the mid range frequency of the higher frequency range; means for modulating the equivalent signal with the amplitude signal to provide a synthetic signal; means for providing a noise signal; means for receiving the noise modulating factor signal; means responsive to the noise modulating factor signal for controlling the level of the noise signal; means for modulating the synthetic signal with the level controlled noise signal; and means for receiving and reproducing the noise modulated synthetic signal and the directly transferred lower frequency range sound signal.
Claim 10
Dependent Claim
185 words
A receiver for use in a system having a transmitter of the type that transfers lower frequency range sound signals directly and at least one pilot frequency signal modulated by an amplitude signal corresponding to the amplitude of the sound signals in a higher frequency range and that provides a signal corresponding to a desired noise modulating factor, said receiver comprising: means for receiving and demodulating the pilot frequency signal to provide an amplitude signal corresponding to the amplitude of the signal in the higher frequency range; means for providing an equivalent signal having a frequency approximately equal to the mid range frequency of the higher frequency range; means for modulating the equivalent signal with the amplitude signal to provide a synthetic signal; means for providing a noise signal; means for receiving the noise modulating factor signal; means responsive to the noise modulating factor signal for controlling the level of the noise signal; means for modulating the synthetic signal with the level controlled noise signal; and means for receiving and reproducing the noise modulated synthetic signal and the directly transferred lower frequency range sound signal.
Claim 11
Dependent Claim
134 words
In a receiver of the type that receives a pilot signal sequentially modulated with amplitude signals corresponding to the amplitudes of sound signals in a predetermined number of partial frequency ranges and reproduces the sound signals in said partial frequency ranges by simulating said partial frequency ranges with equivalent frequency signals having frequencies approximately equal to the mid range frequencies of the partial frequency ranges, said equivalent signals being amplitude modulated to correspond to the amplitude of the signals in the partial frequency ranges, the improvement comprising: means for providing a noise signal having a bandwidth approximately equal to one-half the bandwidth of the frequency spacing between the equivalent signals; and means for modulating the amplitude modulated signals with said noise signal to produce more realistic and pleasing simulation of the partial frequency ranges.
Claim 12
Dependent Claim
134 words
In a receiver of the type that receives a pilot signal sequentially modulated with amplitude signals corresponding to the amplitudes of sound signals in a predetermined number of partial frequency ranges and reproduces the sound signals in said partial frequency ranges by simulating said partial frequency ranges with equivalent frequency signals having frequencies approximately equal to the mid range frequencies of the partial frequency ranges, said equivalent signals being amplitude modulated to correspond to the amplitude of the signals in the partial frequency ranges, the improvement comprising: means for providing a noise signal having a bandwidth approximately equal to one-half the bandwidth of the frequency spacing between the equivalent signals; and means for modulating the amplitude modulated signals with said noise signal to produce more realistic and pleasing simulation of the partial frequency ranges.
Claim 13
Dependent Claim
224 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 by amplitude signals corresponding to the amplitudes of sound signals in a predetermined number of partial higher frequency ranges, a sync signal corresponding to the repetition rate of the sequential modulation of the pilot frequency signal and a signal containing noise modulation factor information, 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 partial higher frequency ranges; means for providing equivalent signals having frequencies approximately equal to the mid range frequency of each partial higher frequency range; means for modulating each equivalent signal with the appropriate amplitude signal to provide synthetic signals for each partial higher frequency range; means for distributing the sequential amplitude signals to the modulating means; means for providing a noise signal; attenuation means responsive to the noise modulation factor signal for attenuating the noise signal in accordance therewith; means for combining the synthetic signals to provide a total synthetic signal; means responsive to the attenuated noise signal for modulating the total synthetic signal therewith; and means for receiving and reproducing the noise modulated synthetic signals and the directly transferred low frequency range sound signals.
Claim 14
Dependent Claim
224 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 by amplitude signals corresponding to the amplitudes of sound signals in a predetermined number of partial higher frequency ranges, a sync signal corresponding to the repetition rate of the sequential modulation of the pilot frequency signal and a signal containing noise modulation factor information, 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 partial higher frequency ranges; means for providing equivalent signals having frequencies approximately equal to the mid range frequency of each partial higher frequency range; means for modulating each equivalent signal with the appropriate amplitude signal to provide synthetic signals for each partial higher frequency range; means for distributing the sequential amplitude signals to the modulating means; means for providing a noise signal; attenuation means responsive to the noise modulation factor signal for attenuating the noise signal in accordance therewith; means for combining the synthetic signals to provide a total synthetic signal; means responsive to the attenuated noise signal for modulating the total synthetic signal therewith; and means for receiving and reproducing the noise modulated synthetic signals and the directly transferred low frequency range sound signals.
Claim 15
Dependent Claim
22 words
A receiver as described in claim 7, wherein the noise modulation factor signal is transmitted as a component of the sync signal.
Claim 16
Dependent Claim
25 words
A receiver as described in claim 8, wherein the noise modulation factor signal corresponds to the amplitude level of a harmonic of the sync signal.
Claim 17
Dependent Claim
47 words
A receiver as described in claim 9, wherein the noise modulation factor signal is transferred as a trapezoidal voltage simultaneously with the amplitude information of the partial higher frequency ranges and as a frequency corresponding to one-half the repetition frequency of the sequential transfer of amplitude information.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-03-23 | 1979-09-22 | 1980-03-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-03-23 | 1983-09-22 | 1984-03-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-03-23 | 1987-09-22 | 1988-03-23 | $7700.00 | Window Closed / Lapsed |