| 摘要 |
A digital to analog data demodulating circuit adapted for selectively demodulating analog data from a plurality of digital data each having a different sampling frequency. The circuit includes an input terminal provided for selectively receiving the plurality of digital data, a digital filter coupled to the input means for shifting higher the sampling frequency of the digital data applied from the input terminal, a D/A converter coupled to the digital filter for generating first and second analog conversion data separated into a lower frequency band and a higher frequency band, the lower frequency band being alsmost conicident with the frequency band of the analog data digitized to the corresponding digital data and the higher frequency band having a center frequency coincident with the shifted sampling frequency and an LPF coupled to the D/A converter for removing the second analog conversion data from the output of the D/A converter.
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