| 摘要 |
PROBLEM TO BE SOLVED: To reproduce audio data with high accuracy by providing a means that expands the number of bits of a digital signal and a means that selects the digital signal obtained by a demodulation means or the digital signal obtained by the bit number expansion means to a component of the D/A converter. SOLUTION: A data line changeover device 402 is connected to an output of a bit expansion device 401. One of signals given to the data line changeover device 402 is a signal outputted from the bit expansion device 401 and the other signal is a signal before it is given to the bit expansion device 401. In the case that a bit length of sample data given to the bit expansion device 401 is 16-bit, a microcomputer 9 controls the data line changeover device 402 to connect to a data line A. In the case that a bit length of sample data given to the bit expansion device 401 is 24-bit, the microcomputer 9 controls the data line changeover device 402 to connect to a data line B that bypasses the bit expansion device 401.
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