Smart car voice input circuit

The smart car voice input circuit is shown in the figure. The VM IC provides the power of the microphone, VSS is the analog ground of the system, VCM is the reference voltage, and pins 1 and 2 are the input pins of the positive and negative terminals of the microphone X1, respectively. When speaking to the microphone, pins 1 and 2 will change waveforms with the sound input from the microphone, and two inverted waveforms will be formed at the two ports of SPCE061A, which are sent to the operational amplifier inside the SPCE061A controller. Audio amplification, the amplified audio signal is converted to digital by the ADC converter, saved to the corresponding register, and then these digital audio signals are compressed, identified, played, and the like.