MCU voice broadcast circuit

What is a ADC ?Analog to Digital Converter DefinitionAn Analog to Digital Converter (ADC) is a device that changes a continuous analog signal into a discrete digital signal.ADC Process Sampling and Holding Quantizing and EncodingSampling and HoldingIn Sampling and Holding (S/H), the continuous signal is sampled and held steady for a short period. This removes variations in the input signal that could affect conversion accuracy. The minimum sampling rate must be twice the maximum frequency of the