US3980953A
Expired / Lapsed
US
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Delta modulation system employing digital frame averaging
Assignee: Lear Siegler Inc
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Filing: 1975-03-17
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Granted: 1976-09-14
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Expires: 1995-03-17
Abstract
Abstract A delta modulator produces a digital bit stream from an input analog waveform and applies same to bit-averaging circuitry dividing the bit stream into time-frame intervals and computing the average slope per frame. Each average time-frame slope value is transmitted over a communication system as a discrete digital signal and at a receiver each such signal is employed to set the gain of a multi-level integrator and thus incrementally reconstruct the original waveform.
Inventors
- 👤 W. Franklin Nance
- 👤 Ronald J. Surprenant
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:30
CPC Classifications
H; H04; H04L; H04L5/00; H04L5/22; H04L5/26; H03; H03M; H03M3/00; H03M3/02; H03M3/022
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
123 words
An improved delta modulation system comprising a non-adaptive delta modulator producing a binary bit stream from an analog input waveform at a sample pulse rate, a pair of up-down counters alternately enabled at a predetermined frame rate to count the algebraic sum of binary input signals from said delta modulator during alternate frames and each storing the count thereof and transmitting upon a transmission system the binary algebraic sum count during the preceding frame, an amplifier connected to said transmission system through gain-adjusting means for producing a pulse train having pulse heights determined by said binary algebraic sum count, and an integrator connected to the output of said amplifier for reconstructing at the integrator output the analog waveform applied to said delta modulator.
Claim 2
Dependent Claim
123 words
An improved delta modulation system comprising a non-adaptive delta modulator producing a binary bit stream from an analog input waveform at a sample pulse rate, a pair of up-down counters alternately enabled at a predetermined frame rate to count the algebraic sum of binary input signals from said delta modulator during alternate frames and each storing the count thereof and transmitting upon a transmission system the binary algebraic sum count during the preceding frame, an amplifier connected to said transmission system through gain-adjusting means for producing a pulse train having pulse heights determined by said binary algebraic sum count, and an integrator connected to the output of said amplifier for reconstructing at the integrator output the analog waveform applied to said delta modulator.
Claim 3
Dependent Claim
76 words
The system of claim 1 further defined by bandwidth limiting means applying an analog waveform to said delta modulator, a generator producing sampling pulses at a rate of ten or more times the highest frequency of input analog signal and applying same to said delta modulator whereby the binary bit stream has a rate of said sampling pulse rate, and said counters being presettable to a predetermined number from which algebraic counting per frame is made.
Claim 4
Dependent Claim
85 words
The system of claim 1 further defined by said binary bit stream representing change in slope of said analog signal per sample period, said up-down counters counting up one for each binary 1 and down one for each binary 0 to produce upon a plurality of output lines binary signals representing average slope per frame, and said gain-adjusting means comprising a plurality of resistors connected one for each binary output line to thus adjust the amplifier gain in accordance with said average slope per frame.
Claim 5
Dependent Claim
66 words
The system of claim 1 further defined by each of said counters being preset to a predetermined initial count per frame representing a zero slope whereby the outputs of the counters are plus or minus and the amplifier gain control means including switching means operated by one bit of the binary count per frame to switch the input between plus and minus inputs of the amplifier.
References Cited (Backward Citations)
US3878465A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-09-14 | 1980-03-15 | 1980-09-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-09-14 | 1984-03-15 | 1984-09-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-09-14 | 1988-03-15 | 1988-09-14 | $7700.00 | Window Closed / Lapsed |