AUDIO COMPRESSION CIRCUIT AND METHOD

摘要

An audio compressor (200) utilizes a switched charging state rectifier (225) which produces an output (240) proportional to the magnitude of an input signal (205) but with controlled attack/release times. The rectified voltage (220) is input to a logical selector (1600), which provides logical control signals which are a function of the rectified voltage. In a preferred embodiment, the control signals of the logical selector are used to select the switch position of a switched resistor ladder. The switched resistor ladder is used to provide a resistance path in an op-amp feedback amplifier, thereby enabling the gain of the op-amp amplifier (235) to be adjusted in steps by the selector as the rectified signal level varies.