AUDIO PRE-AMP AND MID-BAND COMPRESSOR CIRCUIT

摘要

An audio pre-amp and mid-band compressor circuit coupled to receive program signal (21) from a program signal source (16) having a state-variable pre-amplifier (12) responsive to a program input signal (21) to provide a low range band-pass signal (66), a mid-range band-signal (52) and a high range band-pass signal (46) and for summing (40) and scaling a low range band-pass signal, a mid-range band-signal and a high range band-pass signal providing a compensated signal (112). A voltage controlled amplifier circuit (14) has a signal input terminal coupled to receive the compensated signal (112), and a control signal input (140) coupled to receive at least a sample portion of the mid-range band-pass signal (48). The voltage controlled amplifier circuit (14) responds to the amplitude of the sample portion of the mid-range band-pass signal (48) to scale the compensated signal (112) to provide a corrected output signal characterized to remain within a predetermined linear amplitude range at an output terminal.