Smart Car voice input circuit as shown. Among them, VM IC provides power to the microphone, VSS is the system's analog ground, VCM is the reference voltage, a foot and two feet respectively microphone X1 is positive, the negative input pin. When speaking in front of the microphone when a foot and two feet will produce along with voice microphone input waveform change and the formation of two inverted waveform at SPCE061A at two ports, and sent SPCE061A controller internal operational amplifier Audio amplification, the amplified audio signal converted by the ADC to digital converter, stored in the corresponding register, and then compresses the digital audio signal, identification, playback processing.
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