Patent US4100493A successfully refreshed from Google Patents.
US4100493A
Expired / Lapsed
US
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Transmission system for signal transmission by means of compressed delta modulation
Assignee: US Philips Corp
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Filing: 1976-05-25
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Granted: 1978-07-11
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Expires: 1996-05-25
Abstract
Abstract Transmission system for signal transmission by means of compressed delta modulation provided with leaking integrators in the delta modulator and demodulator, the leaking integrator in the modulator being connected in series with the capacitor of large capacitance between the terminals of a signal source having controlled current sources for reducing the noise and distortion produced by the modulator.
Inventors
- 👤 Eise Carel Dijkmans
- 👤 Karel Elbert Kuijk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 15:49
CPC Classifications
H; H03; H03M; H03M3/00; H03M3/02; H03M3/022
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
94 words
A compressed delta modulation transmitter comprising a delta modulator, a feedback circuit comprising a controlled signal source coupled to said modulator, a first integrating network having a first terminal coupled to said controlled signal source, a second terminal coupled to said modulator, and a third terminal, a leakage resistor coupled between said first and third terminals of said integrating network, and a capacitor coupled to said integrating network third terminal and ground, said signal source comprising a pair of current source means for applying current pulses to said integrating network and said leakage resistor.
Claim 2
Dependent Claim
94 words
A compressed delta modulation transmitter comprising a delta modulator, a feedback circuit comprising a controlled signal source coupled to said modulator, a first integrating network having a first terminal coupled to said controlled signal source, a second terminal coupled to said modulator, and a third terminal, a leakage resistor coupled between said first and third terminals of said integrating network, and a capacitor coupled to said integrating network third terminal and ground, said signal source comprising a pair of current source means for applying current pulses to said integrating network and said leakage resistor.
Claim 3
Dependent Claim
36 words
A transmitter as claimed in claim 1, further comprising a second integrating network including said capacitor, said first network having a cutoff frequency at least twenty times higher than the cutoff frequency of said second network.
References Cited (Backward Citations)
US3857111A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-07-10 | 1982-01-09 | 1982-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-07-10 | 1986-01-09 | 1986-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-07-10 | 1990-01-09 | 1990-07-11 | $7700.00 | Window Closed / Lapsed |