Patent ID: 7663416

Claim:
An apparatus for generating an audio output clock, comprising: a first divider, for receiving a video clock signal of a multimedia signal from a multimedia interface and dividing the video clock signal according to a first frequency-division factor K to output a first clock signal; a frequency synthesizer, coupled to the first divider, comprising: a phase detector, for detecting a phase difference between the first clock signal and a feedback signal and generating a detection result according to the phase difference; a controlled oscillator, for generating a second clock signal according to the detection result; and a second divider, for dividing the second clock signal according to a second frequency-division factor M to output the feedback signal; and a third divider, coupled to the frequency synthesizer, for dividing the second clock signal according to a third frequency-division factor SF to output the audio output clock, wherein the audio output clock corresponds to an audio clock signal of the multimedia signal.