A CIRCUIT FOR DETECTING FORMAT SIGNAL

摘要

a format signal judging part(10) judging the effectiveness of the transmission signal by detecting the existence of the interface format in the digital audio signal transferred from a digital audio data transmitter; a PLL part(50) generating the system clock signal according to the interface format signal; a clock generation part(20) generating the clock signal of the same frequency as the locking frequency of the PLL part(50); a clock selection part(30) supplying the system clock signal to a data processing part(40) by selecting the clock signal of the PLL part(50) or the clock signal of the clock generation part(20) according to the result signal of the format signal judging part(10).