Patent ID: 7738615

Claim:
A sampling frequency conversion apparatus having sampling frequency conversion circuits for a plurality of channels, comprising: a detector which detects phase information of digital signals inputted to the sampling frequency conversion circuit for each channel; an input section which inputs setting information for the sampling frequency conversion circuits for two or more channels to be phase-synchronized of the sampling frequency conversion circuits for the plurality of channels; a phase information supplier which supplies the phase information for the sampling frequency conversion circuit for a specific channel of the sampling frequency conversion circuits for the two or more channels designated by the setting information inputted into the input section to the sampling frequency conversion circuits for the remaining channels of the sampling frequency conversion circuits for the two or more channels other than the sampling frequency conversion circuit for the specific channel; a sampling frequency converter which performs sampling frequency conversion based on the phase information of the sampling frequency conversion circuits for the remaining channels in synchronization with the phase information for the specific channel supplied from the phase information supplier; a selector which selects the specific channel based on the inputted phase information detected by the detector for each channel; a first code generator which directs the sampling frequency conversion circuit for the specific channel to operate in synchronization with the phase information of the specific channel detected by the detector; and a second code generator which directs the sampling frequency conversion circuits for the remaining channels to operate in synchronization with the phase information supplied by the selector.