| 摘要 |
Analogue to digital (A/D) and digital to analogue (D/A) converters perform the required conversion at a higher sampling rate (e.g. 64Fs) and a lower resolution (e.g. 1 to 4 bits) than the actual sampling rate (Fs) and resolution (e.g. 16 bits) of the required digital signal. The oversampled low resolution signal is generated by oversampling the input digital signal (for D/A conversion) or is decimated to generate the required output digital signal (for A/D conversion). The oversampling or decimation filters are switchable between two modes of operation, in which different signal delays are imposed by the filter. Thus a lower quality, but shorter delay, filter can be used in converters in the signal path for an artist's foldback signal. This can reduce the subjectively disturbing effects of long conversion delays in the foldback signal path.
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