Patent US3579231A successfully refreshed from Google Patents.
US3579231A
Expired / Lapsed
US
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Code translation circuits
Assignee: The General Electric Company PLC
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Filing: 1968-09-17
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Granted: 1971-05-18
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Expires: 1988-09-17
Abstract
Abstract A P.C.M. coder using the Waldhauer principle (see U.S. Pat. No. 3,187,325), of incorporating a current-switching decision-device in an amplifier feedback loop, in which each coding stage has only a single high-gain amplifier. In each such stage, the input analogue signal to the stage and a reference voltage are supplied to the amplifier and four diode rectifiers are connected in a bridge circuit in a feedback path across the amplifier. The amplifier of each stage supplies a digital signal representing the coding effected by that stage and the analogue output signal for passing onto the next stage is developed across a resistor which is connected across one diagonal of the bridge circuit.
Inventors
- 👤 Piotor Bylanski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 09:14
CPC Classifications
H; H03; H03M; H03M1/00; H03M1/12; H03M1/14
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
135 words
In a binary coding circuit of the kind comprising a plurality of stages connected in tandem, each stage having an analog input, a digital output and an analog output connected to the analog input of the next stage, an analog residue being passed on from each stage, after a digital decision has been made, at least one said stage comprises an amplifier, means for applying the analog residue and a reference signal to the input of said amplifier, and a feedback circuit comprising bridge network, one diagonal of which is connected between the amplifier output and the amplifier input, the bridge network having a nonlinear device in each arm and an impedance connected across the other diagonal, the digital output being provided by the amplifier output and the analog residue being developed across said impedance.
Claim 2
Dependent Claim
135 words
In a binary coding circuit of the kind comprising a plurality of stages connected in tandem, each stage having an analog input, a digital output and an analog output connected to the analog input of the next stage, an analog residue being passed on from each stage, after a digital decision has been made, at least one said stage comprises an amplifier, means for applying the analog residue and a reference signal to the input of said amplifier, and a feedback circuit comprising bridge network, one diagonal of which is connected between the amplifier output and the amplifier input, the bridge network having a nonlinear device in each arm and an impedance connected across the other diagonal, the digital output being provided by the amplifier output and the analog residue being developed across said impedance.
Claim 3
Dependent Claim
45 words
A binary coding circuit according to claim 1, wherein said bridge network comprises a rectifier diode in each arm, the diodes being directed as for a full-wave bridge rectifier and said impedance comprising a resistor connected between the unidirectional current terminals of the bridge network.
Claim 4
Dependent Claim
41 words
A coding circuit comprising, for each stage according to claim 1, a differential amplifier having two inputs, respectively connected to the termination of said impedance, the output of said differential amplifier being connected to the analog input of the following stage.
Claim 5
Dependent Claim
37 words
A straight binary coding circuit in accordance with claim 1, and comprising, in each stage after the first, means for controlling the application of said reference signal in dependence upon the digital output of the preceding stage.
References Cited (Backward Citations)
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US3271759A
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US3259896A
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US3419819A
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US3484779A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-05-17 | 1974-11-16 | 1975-05-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-17 | 1978-11-16 | 1979-05-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-17 | 1982-11-16 | 1983-05-18 | $7700.00 | Window Closed / Lapsed |