Patent ID: 7760766

Claim:
An audio processor for reproducing audio data transmitted through a digital interface, comprising: a sampling frequency information detector for detecting sampling frequency information indicating a sampling frequency of the audio data from the audio data; a comparison clock frequency divider for obtaining a frequency division ratio according to the sampling frequency information, dividing a frequency of a PLL clock signal and outputting a comparison clock signal obtained by dividing the frequency of the PLL clock signal by the frequency division ratio; a digital PLL circuit for outputting a pre-PLL clock signal having a phase according to a phase difference between an input reference clock signal and the comparison clock signal; an analog PLL circuit for outputting the PLL clock signal based on the pre-PLL clock signal and outputting a resultant signal; and an audio clock frequency divider for dividing the frequency of the PLL clock signal and outputting an audio clock signal obtained by dividing the frequency of the PLL clock signal, wherein the digital PLL circuit is configured to change the frequency of the pre-PLL clock signal according to the sampling frequency information.