Patent ID: 8502717

Claim:
An analog-to-digital converter, receiving a first audio signal from a microphone sensor, receiving a mode signal, a channel selection signal, and a clock signal, comprising: a toggle detection module, determining whether the channel selection signal is toggling between a logic low level and a logic high level to generate a first control signal; a pre-amplifier, amplifying the first audio signal to obtain a second audio signal; a 1-bit ΔΣ modulator, converting the second audio signal from analog to digital to obtain a third audio signal; and a signal coding module, if the mode signal indicates an encoding mode and the channel selection signal is determined to be toggling, encoding a fourth audio signal according to the third audio signal, outputting data bits of the fourth audio signal when the clock signal oscillates to the logic low level, and outputting data bits of the channel selection signal when the clock signal oscillates to the logic high level.