US3784754A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus and method for transmitting and receiving signals based upon half cycles
Assignee: Individual
•
Filing: 1972-02-23
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Granted: 1974-01-08
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Expires: 1992-02-23
Abstract
Abstract Selected portions of an input signal are sampled. Preferably, the portions not sampled are redundant with respect to the sampled portions. This is true if, for instance, the sampled portions are half cycles of a sound wave. The sampled information can be distributed over the time intervals occupied by the sampled and the not sampled portions of the input wave to produce a coded signal having a lower frequency than the original wave. This process can be reversed to substantially reproduce the original wave.
Inventors
- 👤 I Hagiwara
- 👤 S Okamura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 05:56
CPC Classifications
H; H04; H04B; H04B1/00; H04B1/66
Claims Analysis
Total Claims: 27
Claim 1
Independent Claim
103 words
A compressed frequency band signal transmission system comprising means for sampling half cycles of an input signal to be transmitted, said sampled Half cycles being substantially similar to the half cycles not sampled, means responsive to the sampled half cycles for producing a coded signal, means for distributing the coded signal over the time intervals occupied by the half cycles that are not sampled as well as time intervals occupied by the half cycles that are sampled, and means for regenerating portions of the signal that are not sampled as well as portions of the signal that are sampled from the coded signal.
Claim 2
Dependent Claim
103 words
A compressed frequency band signal transmission system comprising means for sampling half cycles of an input signal to be transmitted, said sampled Half cycles being substantially similar to the half cycles not sampled, means responsive to the sampled half cycles for producing a coded signal, means for distributing the coded signal over the time intervals occupied by the half cycles that are not sampled as well as time intervals occupied by the half cycles that are sampled, and means for regenerating portions of the signal that are not sampled as well as portions of the signal that are sampled from the coded signal.
Claim 3
Dependent Claim
35 words
The apparatus of claim 1, further comprising means for determining the time at which sampling of the input signal takes place including a clipper, a flip-flop, and circuit means for halving the width of pulses.
Claim 4
Dependent Claim
65 words
A compressed frequency band signal transmission system comprising a sampling circuit means which samples a half cycle of an input wave, a buffer memory coupled to the sampling circuit means, an inverter, and a control means for controlling the sampling circuit means, the buffer memory, and the inverter being arranged to produce a coded signal containing information relating to sampled portions of the input wave.
Claim 5
Dependent Claim
65 words
A compressed frequency band signal transmission system comprising a sampling circuit means which samples a half cycle of an input wave, a buffer memory coupled to the sampling circuit means, an inverter, and a control means for controlling the sampling circuit means, the buffer memory, and the inverter being arranged to produce a coded signal containing information relating to sampled portions of the input wave.
Claim 6
Dependent Claim
18 words
The apparatus of claim 3, wherein the control means includes a plurality of counters and a gating-signal generator.
Claim 7
Dependent Claim
27 words
The apparatus of claim 3, wherein said control means includes a clipping circuit, an astable multivibrator, a pulse width doubler, a one-period-gate, and a plurality of counters.
Claim 8
Dependent Claim
48 words
A signal transmission system comprising means for removing redundant alternate half cycles of a sound wave, and means for expanding the remaining half cycles to distribute them over the intervals occupied by the sampled and not sampled portions, thus dividing in half the frequency of the signal transmitted.
Claim 9
Dependent Claim
48 words
A signal transmission system comprising means for removing redundant alternate half cycles of a sound wave, and means for expanding the remaining half cycles to distribute them over the intervals occupied by the sampled and not sampled portions, thus dividing in half the frequency of the signal transmitted.
Claim 10
Dependent Claim
27 words
The apparatus of claim 6, further comprising a means for producing negative feedback, wherein the means for removing redundant half cycles is responsive to the negative feedback.
Claim 11
Dependent Claim
58 words
A signal transmission system comprising, a wave separator, a gating circuit, an analogue-to-digital converter, a plurality of buffer memories, and a control means coupled to the above components whereby alternate half cycles of the wave to be transmitted are sampled and distributed along the time axis over the intervals containing the sampled and the not sampled half cycles.
Claim 12
Dependent Claim
58 words
A signal transmission system comprising, a wave separator, a gating circuit, an analogue-to-digital converter, a plurality of buffer memories, and a control means coupled to the above components whereby alternate half cycles of the wave to be transmitted are sampled and distributed along the time axis over the intervals containing the sampled and the not sampled half cycles.
Claim 13
Dependent Claim
98 words
A compressed frequency band voice signal transmission system comprising a means for dividing the voice signal into a plurality of frequency bands, means for sampling alternate half cycles of the voice signal which fall within each band, means responsive to the sampled half cycles of the signal for producing a coded signal, and means for distributing the coded signal derived from each frequency band over the time intervals occupied by the half cycles of the signal in that band that are not sampled as well as the half cycles of the signal in that band that are sampled.
Claim 14
Dependent Claim
98 words
A compressed frequency band voice signal transmission system comprising a means for dividing the voice signal into a plurality of frequency bands, means for sampling alternate half cycles of the voice signal which fall within each band, means responsive to the sampled half cycles of the signal for producing a coded signal, and means for distributing the coded signal derived from each frequency band over the time intervals occupied by the half cycles of the signal in that band that are not sampled as well as the half cycles of the signal in that band that are sampled.
Claim 15
Dependent Claim
36 words
The apparatus of claim 9, further comprising an analogue-to-digital converter connected to the sampling means associated with more than one of the frequency bands for converting the sampled hall cycles of the signal to digital form.
Claim 16
Dependent Claim
24 words
The apparatus of claim 9, wherein each frequency band of the signal is limited to less than twice of the lowest frequency it contains.
Claim 17
Dependent Claim
60 words
In a compressed frequency band signal transmission system, an apparatus for producing a coded signal comprising means for sampling alternate half cycles of an input signal, means responsive to the sampled half cycles for producing a coded signal, and means for distributing the coded signal over the intervals occupied by the sampled half cycles and the not sampled half cycles.
Claim 18
Dependent Claim
60 words
In a compressed frequency band signal transmission system, an apparatus for producing a coded signal comprising means for sampling alternate half cycles of an input signal, means responsive to the sampled half cycles for producing a coded signal, and means for distributing the coded signal over the intervals occupied by the sampled half cycles and the not sampled half cycles.
Claim 19
Dependent Claim
35 words
The apparatus of claim 12, wherein the sampling means is responsive to the input signal to commence sampling a half cycle at a predetermined position with respect to the zero point of said input signal.
Claim 20
Dependent Claim
22 words
The apparatus of claim 12, wherein the each sampled half cycle beging and ends at a zero point of the input signal.
Claim 21
Dependent Claim
17 words
The apparatus of claim 12, further comprising meAns for delta modulating the input signal prior to sampling.
Claim 22
Dependent Claim
34 words
The apparatus of claim 12, wherein the sampling means includes a clipper, and the means for distributing the coded signal includes a plurality of gates, a countdown circuit, a buffer memory, and an inverter.
Claim 23
Dependent Claim
60 words
In a signal transmission system, an apparatus comprising means for shortening successive half cycles of an input wave containing sound information, means for producing a polarity-inverted half cycle corresponding to each shortened half cycle, and means for inserting the polarity-inverted half cycles between shortened half cycles thereby providing a continuous output wave having twice the frequency of the input wave.
Claim 24
Dependent Claim
60 words
In a signal transmission system, an apparatus comprising means for shortening successive half cycles of an input wave containing sound information, means for producing a polarity-inverted half cycle corresponding to each shortened half cycle, and means for inserting the polarity-inverted half cycles between shortened half cycles thereby providing a continuous output wave having twice the frequency of the input wave.
Claim 25
Dependent Claim
41 words
A public address system including the apparatus of claim 17, further comprising means for monitoring the sound waves produced by the system, and means for varying the portion of the signal removed in response to the output of the monitoring means.
Claim 26
Independent Claim
89 words
A method for transmitting signals having substantial redundancy and containing sound information, comprising removing substantially redundant alternate half cycles of a sound wave, lengthening the remaining half cycles of the wave whereby its frequency is decreased, recording the wave of decreased frequency, playing back the wave of decreased frequency, regenerating the redundant half cycles of the wave that were removed, shortening the wave to leave spaces between the sampled half cycles, and inserting the regenerated half cycles of the wave in the spaces to substantially recreate the original wave.
Claim 27
Independent Claim
89 words
A method for transmitting signals having substantial redundancy and containing sound information, comprising removing substantially redundant alternate half cycles of a sound wave, lengthening the remaining half cycles of the wave whereby its frequency is decreased, recording the wave of decreased frequency, playing back the wave of decreased frequency, regenerating the redundant half cycles of the wave that were removed, shortening the wave to leave spaces between the sampled half cycles, and inserting the regenerated half cycles of the wave in the spaces to substantially recreate the original wave.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-01-07 | 1977-07-09 | 1978-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-07 | 1981-07-09 | 1982-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-07 | 1985-07-09 | 1986-01-08 | $7700.00 | Window Closed / Lapsed |