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VIDEO_COMPRESSOR

2016-09-13 22:07  
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VIDEO_COMPRESSOR
Nonlinear function amplifier IC-2 compresses video input signals as required to compensate for inefficient quantization where there are too many levels for small signals and too few levels for large signals. Designed to feed 6-bit analog-to-digital converter, IC-1 attenuates input -20 dB and shifts level.Output of IC-2 is amplified by IC-3 to voltage range comparable to that of input signal. IC-4 acts as temperature compensator and output level shifter. R7 nulls small output offsets.—J.B. Frost, Non-Linear Function Amplifier, EEE Magazine, March 1971, p 78.