US3624558A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Delta modulation encoder having double integration
Assignee: AT&T Inc
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Filing: 1970-01-16
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Granted: 1971-11-30
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Expires: 1990-01-16
Abstract
Abstract A delta modulation encoder has a second integrator for producing more rapid alternations in the noise signal, thereby removing a portion of the noise from the signal frequency band. The integrator is clamped to prevent excessive overshoots.
Inventors
- 👤 Stephen Joseph Brolin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 03:18
CPC Classifications
H; H03; H03M; H03M3/00; H03M3/02
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
158 words
A delta modulation encoder for converting an analog signal into a digital pulse signal, the analog signal being characterized by the occurrence of large transients, said encoder comprising a first integrator circuit, means for comparing the output of said integrator with the analog signal to produce a difference signal, means responsive to the output of the comparing means for producing a digital signal output indicative of the sign of the difference, means for feeding back the digital signal output to said integrator, means comprising a series combination of a resistor and a capacitor connected from a point between said comparing means and the digital signal producing means to ground for producing a short term average of the difference between the analog signal and the inteGrator output, and means connected across said capacitor for reducing the magnitude of overshoot of said integrator upon the occurrence of large signal transients comprising means for maintaining a fixed charge on said capacitor.
Claim 2
Dependent Claim
158 words
A delta modulation encoder for converting an analog signal into a digital pulse signal, the analog signal being characterized by the occurrence of large transients, said encoder comprising a first integrator circuit, means for comparing the output of said integrator with the analog signal to produce a difference signal, means responsive to the output of the comparing means for producing a digital signal output indicative of the sign of the difference, means for feeding back the digital signal output to said integrator, means comprising a series combination of a resistor and a capacitor connected from a point between said comparing means and the digital signal producing means to ground for producing a short term average of the difference between the analog signal and the inteGrator output, and means connected across said capacitor for reducing the magnitude of overshoot of said integrator upon the occurrence of large signal transients comprising means for maintaining a fixed charge on said capacitor.
Claim 3
Dependent Claim
35 words
A delta modulation encoder as claimed in claim 1 wherein the means for maintaining the short term average between predetermined limits comprises a pair of oppositely poled diodes connected to one plate of said capacitor.
Claim 4
Dependent Claim
22 words
A delta modulation encoder as claimed in claim 2 and further including means for back-biasing said diodes to the said predetermined limits.
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) | 1974-11-29 | 1975-05-31 | 1975-11-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-29 | 1979-05-31 | 1979-11-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-29 | 1983-05-31 | 1983-11-30 | $7700.00 | Window Closed / Lapsed |