US3555423A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Modulation control circuits for delta-modulation telecommunication systems
Assignee: TECHNOLOGY UK
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Filing: 1968-02-06
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Granted: 1971-01-12
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Expires: 1988-02-06
Abstract
Abstract A DELTA-MODULATION TELECOMMUNICATIONS SYSTEM CAN BE MADE TO CARRY SIGNALS OF WIDER DYNAMIC RANGE BY PULSEDURATION MODULATING FEEDBACK SIGNALS IN THE TRANSMITTER CIRCUIT AND RECEIVED SIGNALS IN THE RECEIVER CIRCUIT. THE MODULATION SHOULD VARY WITH THE AMOUNT OF INFORMATION CARRIED OR INVERSELY WITH THE FREQUENCY OF REVERSALS IN THE DELTA-MODULATED SIGNAL. A MODULATION CONTROL SIGNAL MAY BE DERIVED BY A CIRCUIT COMPRISING A TWO-STAGE SHIFT REGISTER, THREE GATES, AND AN R-C INTEGRATING NETWORK. SEVERAL PULSE-DURATION MODULATING ARRANGEMENTS ARE DESCRIBED. THESE IMPROVEMENTS CAN BE INCORPORATED IN A COMPACT FORM, USING INTEGRATED CIRCUITS.
Inventors
- 👤 Raymond Charles Weston
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 17:14
CPC Classifications
H; H03; H03M; H03M3/00; H03M3/02; H03M3/022
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-01-11 | 1974-07-13 | 1975-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-11 | 1978-07-13 | 1979-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-11 | 1982-07-13 | 1983-01-12 | $7700.00 | Window Closed / Lapsed |