Patent ID: 8548616
Filing Date: 2013-10-01
Classification: H03F,H04L

Abstract:
1. A digital audio device comprising: a plurality of input ports that are adapted to receive digital audio signals; a plurality of extraction parts corresponding to the plurality of the input ports, each extraction part extracting a clock signal from the digital audio signal when a clock signal is superimposed in the digital audio signal received by the corresponding input port; a first selection part that selects the extracted clock signal as a word clock when the clock signal is extracted by one of the plurality of the extraction parts; a frequency storage part that stores a frequency of the clock signal selected by the first selection part as a current frequency; an internal clock generator that outputs a clock signal having a frequency as specified; a second selection part that determines whether another extraction part extracts a clock signal when the one extraction part becomes unable to extract the clock signal which is currently selected as the word clock, and that selects the clock signal output from the internal clock generator as a word clock when it is determined that no clock signal is extracted by any of the plurality of the extraction parts and sets the frequency of the clock signal output from the internal clock generator to the current frequency stored in the frequency storage part; and a reception part that receives the digital audio signals provided to the plurality of the input ports in synchronization with the word clock selected by one of the first selection part and the second selection part.