A multi-channel audio signal automatic gain adjustment circuit

Abstract

The utility model relates to the field of microphone switching, specifically a multi-channel audio signal automatic gain adjustment circuit. The circuit includes a microphone input unit, an identification unit, a gain adjustment unit and a mixing unit; wherein there are more than two microphone input units, each with a gain adjustment unit, and the adjusted audio output is simultaneously connected to the mixing unit; the identification unit acquires the current status of the microphone input unit through loop collection, and controls the working status of the gain adjustment unit and the mixing unit of each microphone input unit by hardware, so that multiple microphones can automatically adjust the circuit gain. This circuit is often used to detect the audio information of a mobile phone or computer, and sample it to provide a sound source for the sound and light synchronization of an RGB / RGBIC music controller; the collection environment is that when the sound source of the mobile phone or computer is unplugged, it automatically switches to the sound source information in the pickup mode of a capacitive electret microphone, and provides a sound source for the sound and light synchronization of the RGB / RGBIC music controller, and uses an interval power supply to ensure that faults are detected and that the circuit will not fail.