Abstract
A single integrated circuit chip is provided with transistors, diodes, resistor and capacitors thereon for forming a variable gainamplifier (40) and gain control circuitry which provides a level dependent frequency response characteristic, operative at low signal levels to enhance gain at higher frequencies relative to that at lower frequencies. The gain control circuitry includes logarithmic rectifier means (48) operative to develop an AC output signal having a peak value varying as a logarithmic function of a signal level which may be that at the output of the variable gain amplifier (40). The AC output signal so developed is applied to a peak detector circuit in a compression ratio control circuit (46) to develop a DC signal which is amplified by a DC amplifier and applied to a control input of the variable gain amplifier (40).
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