US4633196A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Delta modulator/demodulator with improved tracking of rapidly varying waveforms
Assignee: Motorola Solutions Inc
•
Filing: 1985-04-18
•
Granted: 1986-12-30
•
Expires: 2005-04-18
Abstract
Abstract In a delta modulator/demodulator incorporating continuously variable slope circuitry (8, 9, 10), the current passed to an integrator (3) to increase its gain, is squared by a squaring circuit (13) in order to increase the sensitivity of the modulator/demodulator to fast rising and falling waveforms and high frequencies.
Inventors
- 👤 Nahum Peled
- 👤 Shmuel Frenkel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 16:07
CPC Classifications
H; H03; H03M; H03M3/00; H03M3/02; H03M3/022; H03M3/024
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
124 words
A delta modulator/demodulator comprising: a sampler circuit for providing a clocked digital output signal; an integrator circuit for integrating a ramp signal whose sign is dependent on said clocked digital output signal so as to provide an analogue signal; and continuously variable slope circuitry for providing said ramp signal and including means for monitoring said clocked digital output signal and for providing an output signal dependent thereon, means responsive to said output signal for generating said ramp signal having a slope dependent on said output signal, and squaring means for squaring said ramp signal, whereby the sensitivity of the variable slope circuitry is increased such that said analogue signal provided by said integrator circuit has a faster response to said clocked digital output signal.
Claim 2
Dependent Claim
124 words
A delta modulator/demodulator comprising: a sampler circuit for providing a clocked digital output signal; an integrator circuit for integrating a ramp signal whose sign is dependent on said clocked digital output signal so as to provide an analogue signal; and continuously variable slope circuitry for providing said ramp signal and including means for monitoring said clocked digital output signal and for providing an output signal dependent thereon, means responsive to said output signal for generating said ramp signal having a slope dependent on said output signal, and squaring means for squaring said ramp signal, whereby the sensitivity of the variable slope circuitry is increased such that said analogue signal provided by said integrator circuit has a faster response to said clocked digital output signal.
Claim 3
Dependent Claim
30 words
A delta modulator/demodulator according to claim 1 wherein said squaring means comprises an X-Y multiplier circuit connected to receive the same ramp signal at both the X and Y inputs.
Claim 4
Dependent Claim
155 words
A data transmission system having a plurality of channels, each channel having a delta modulator/demodulator comprising: a sampler circuit for providing a clocked digital output signal; an integrator circuit for integrating a ramp signal whose sign is dependent on said clocked digital output signal so as to provide an analogue signal; and continuously variable slope circuitry for providing said ramp signal and including means for monitoring said clocked digital output signal and for providing an output signal dependent thereon, and means responsive to said output signal for generating said ramp signal having a slope dependent on said output signal; the data transmission system further comprising squaring means for squaring said ramp signal whereby the sensitivity of the variable slope circuitry is increased such that said analogue signal provided by said integrator circuit has a faster response to said clocked digital output signal, and means for time-sharing said squaring means between each of said delta modulator/demodulators.
Claim 5
Dependent Claim
155 words
A data transmission system having a plurality of channels, each channel having a delta modulator/demodulator comprising: a sampler circuit for providing a clocked digital output signal; an integrator circuit for integrating a ramp signal whose sign is dependent on said clocked digital output signal so as to provide an analogue signal; and continuously variable slope circuitry for providing said ramp signal and including means for monitoring said clocked digital output signal and for providing an output signal dependent thereon, and means responsive to said output signal for generating said ramp signal having a slope dependent on said output signal; the data transmission system further comprising squaring means for squaring said ramp signal whereby the sensitivity of the variable slope circuitry is increased such that said analogue signal provided by said integrator circuit has a faster response to said clocked digital output signal, and means for time-sharing said squaring means between each of said delta modulator/demodulators.
Claim 6
Dependent Claim
33 words
A data transmission system according to claim 3 wherein the time-sharing means comprises an analogue multiplexer and a demultiplexer which are switched at a predetermined rate and have said squaring means connected therebetween.
Claim 7
Dependent Claim
20 words
A data transmission system according to claim 4 wherein said multiplexer and demultiplexer are switched at the data sampling rate.
References Cited (Backward Citations)
US3706944A
Cited
US3748586A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-12-29 | 1990-06-30 | 1990-12-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-12-29 | 1994-06-30 | 1994-12-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-12-29 | 1998-06-30 | 1998-12-30 | $7700.00 | Window Closed / Lapsed |