| 摘要 |
PROBLEM TO BE SOLVED: To provide a multi-sampling-rateΣΔDAC system that improves the S/N when a plurality of digital input signals sampled at different sampling rates are converted by using a commonΣΔDAC device. SOLUTION: A 1st digital input signal which is sampled at a sampling frequency twice or less as high as a nearly upper-limit frequency of the audio frequency range is processed by sampling rate conversion to generate a 1st up digital input signal. This 1st up digital input signal and a 2nd digital input signal of high sampling frequency are selected and supplied to theΣΔDAC device to output analog signals. COPYRIGHT: (C)2006,JPO&NCIPI
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