Digital microphone system, audio control device, and control method thereof

A method for controlling an audio control device, applicable to an audio control device, wherein the audio control device is used to control a digital microphone circuit, the digital microphone circuit has a first timing pin and a first data pin, the audio control device has a second timing pin and a second data pin, the control method comprising:

• outputting a clock signal to the first timing pin via the second timing pin;
• maintaining the clock signal at a predetermined level;
• switching a transmission type of the first data pin from an output type to an input type when the clock signal is maintained at the predetermined level for a first given time;
• when the clock signal is maintained at the predetermined level for a second given time, switching a transmission type of the second data pin from an input type to an output type, wherein the first given time is less than or equal to the second given time;
• and
• after the transmission type of the second data pin is switched to the output type, outputting the clock signal having multiple pulses to the first timing pin via the second timing pin, and outputting a command signal to the first data pin in the input type via the second data pin in the output type in response to an edge of the clock signal.

A digital microphone system, comprising:

• a digital microphone circuit, comprising;
• a sensor, for sensing an external sound wave and correspondingly generating an analog audio signal;
• a gain adjust , for adjusting magnitude of the analog audio signal according to a gain value;
• a modulation circuit, for converting the adjusted analog audio signal into a digital audio signal;
• a command processing unit;
• a first timing pin, for receiving a clock signal;
• a first data pin;
• a first switching unit, wherein when the first data pin is in an output type, the first data pin is electrically connected to the modulation circuit via the first switching unit, modulation circuit outputs the digital audio signal via the first data pin according to an edge of the clock signal, and when the first data pin is in an input type, the first data pin is electrically connected to the command processing unit via the first switching unit, the command processing unit receives a command signal via the first data pin;
• and
• a timing detection unit, for detecting the clock signal and controlling operation of the switching unit according to the clock signal.

An audio control device, for controlling a digital microphone circuit having a first timing pin and a first data pin, the audio control device comprising:

• a signal processing unit, for processing on a digital audio signal;
• a signal generation unit, for generating a command signal;
• a second timing pin, electrically connected to the first timing pin;
• a second data pin, electrically connected to the first data pin;
• a switching unit, for performing selection so that the second data pin is in an input type or an output type, wherein when the second data pin is in the input type, the second data pin is used to receive the digital audio signal, and when the second data pin is in the output type, the second data pin is used to output the command signal;
• a timing generation unit, for generating a clock signal and outputting the clock signal via the second timing pin;
• and
• a signal detection unit, for detecting the digital audio signal, controlling operation of the switching unit and the signal generation unit according to the digital audio signal, and enabling the timing generation unit to generate the corresponding clock signal.