Analog encoder decoder circuit

Details Analog encoder decoder circuit Analog encoder decoder circuit

1976-02-02

1976-12-14

Canney, Vincent P.

Dynamic magnetic information storage or retrieval

Recording or reproducing an information signal and a control...

360 67, G11B 502

Patent

active

039979148

ABSTRACT:
An analog encoder/decoder circuit for use with an instrumentation recorder hich folds the recorded signal over and reuses the same voltage-controlled oscillator range three times at three different gains, thereby increasing the dynamic range to over 10,000. Depending on the level of the input signal, a first multiplexer selects one of three amplifier gains for amplifying the input signal prior to recording. Taken together, the three amplifier gains comprise a piece-wise linear approximation of a logarithmic curve. After playback or demodulation by the recorder, one of three corresponding inverse gain amplifiers are selected for amplifying the playback signal by a second multiplexer whereby the output signal is substantially identical to the input signal.

REFERENCES:
patent: 3041415 (1962-06-01), Gratian
patent: 3379839 (1968-04-01), Bennett
patent: 3657489 (1972-04-01), Clark, Jr.

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