US3967269A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Analogue to digital converters
Assignee: British Broadcasting Corp
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Filing: 1974-04-29
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Granted: 1976-06-29
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Expires: 1994-04-29
Abstract
Abstract An analogue-to-digital converter of the parallel-series-parallel type has additional circuitry associated with the second quantization stage which accepts overflow caused by errors in the first quantization stage and generates a correction signal to correct the output of the first quantization stage.
Inventors
- 👤 Russell Edward Fletcher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 13:20
CPC Classifications
H; H03; H03M; H03M1/00; H03M1/12; H03M1/14; H03M1/16
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
165 words
An analogue-to-digital converter comprising: first digitising means for relating an analogue input signal to one of a plurality of coarse amplitude ranges and providing a digital output indicative of the coarse range into which said input signal falls; subtractive means for determining the difference between said analogue input signal and the coarse level corresponding to said coarse range into which said input signal falls and providing an output in response thereto; second digitising means for providing a digital output indicative of said difference; means for detecting whenever said output of said subtractive means exceeds a range defined by said coarse range and for generating a digital correction signal in response thereto; and means for digitally adding said digital correction signal to said output of said first digitising means, and for modifying said output of said second digitising means to provide a digital output indicative of the difference between said analogue input signal and a coarse level adjacent to that indicated by said first digitising means.
Claim 2
Dependent Claim
165 words
An analogue-to-digital converter comprising: first digitising means for relating an analogue input signal to one of a plurality of coarse amplitude ranges and providing a digital output indicative of the coarse range into which said input signal falls; subtractive means for determining the difference between said analogue input signal and the coarse level corresponding to said coarse range into which said input signal falls and providing an output in response thereto; second digitising means for providing a digital output indicative of said difference; means for detecting whenever said output of said subtractive means exceeds a range defined by said coarse range and for generating a digital correction signal in response thereto; and means for digitally adding said digital correction signal to said output of said first digitising means, and for modifying said output of said second digitising means to provide a digital output indicative of the difference between said analogue input signal and a coarse level adjacent to that indicated by said first digitising means.
Claim 3
Dependent Claim
20 words
A converter according to claim 1, wherein the input of said detecting means is connected to said second digitising means.
Claim 4
Dependent Claim
43 words
A converter according to claim 1, wherein said subtractive means comprises a digital-to-analogue converter connected to receive the digital output of said first digitising means and an analogue subtractor connected to receive the output of said digital-to-analogue converter and said analogue input signal.
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) | 1979-06-29 | 1979-12-29 | 1980-06-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-06-29 | 1983-12-29 | 1984-06-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-06-29 | 1987-12-29 | 1988-06-29 | $7700.00 | Window Closed / Lapsed |