Patent US3668559A successfully refreshed from Google Patents.
US3668559A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Audio to digital converter
Assignee: SCOPE ACQUISITION CORP A DE CORP
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Filing: 1970-11-16
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Granted: 1972-06-06
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Expires: 1990-11-16
Abstract
Abstract An audio-to-digital converter having a comparator means for comparing an audio input with a feedback signal. The feedback is coupled to the comparator through a feedback control device so that a constant comparison occurs.
Inventors
- 👤 Richard E Williams
- 👤 Warren L Holford
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 12:54
CPC Classifications
H; H03; H03M; H03M3/00; H03M3/02
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
67 words
A speech-to-digital converter comprising summing means, means for providing an audio input representative of speech to said summing means, latching means, inverting amplifier means coupling the output of said summing means to the input of said latching means, clock means for strobing said latching means at a predetermined fixed rate, and loss means coupling the output of said latching means to the input of said summing means.
Claim 2
Dependent Claim
67 words
A speech-to-digital converter comprising summing means, means for providing an audio input representative of speech to said summing means, latching means, inverting amplifier means coupling the output of said summing means to the input of said latching means, clock means for strobing said latching means at a predetermined fixed rate, and loss means coupling the output of said latching means to the input of said summing means.
Claim 3
Dependent Claim
40 words
The converter of claim 1 wherein said amplifier has sufficient gain to offset said loss in the closed loop around said latching means whereby successive clock pulses will cause said latching means to complement when no audio input is present.
References Cited (Backward Citations)
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US3273141A
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US3506917A
Cited
US3516022A
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US3582784A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-06-06 | 1975-12-06 | 1976-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-06 | 1979-12-06 | 1980-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-06 | 1983-12-06 | 1984-06-06 | $7700.00 | Window Closed / Lapsed |