Accession Number : ADD003616

Title :   Analog Encoder Decoder Circuit.

Descriptive Note : Patent,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON D C

Personal Author(s) : White,Jack R

Report Date : 14 Dec 1976

Pagination or Media Count : 6

Abstract : An analog encoder/decoder circuit for use with an instrumentation recorder which 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 is described. 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.

Descriptors :   *Patents, *Coders, *Decoders, *Circuits, Analog systems, Playback, Recording systems, Multiplexing

Subject Categories : Electrical and Electronic Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE