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not quite correct

This is apparently the assumption in the IAR article. But it is not correct. There is no sample-and-hold that waits for a number of bits to do an average. The recent density is recomputed in a sense at every new bit. The bandwidth depends on specific implementaion. You are right that the bandwidth is nowhere close to half the sampling time, as it is in a PCM system. That is why the sampling time is so high (64*44.1 kHz). The effective bandwidth of SACD is probably about 50 or 60 kHz. I doubt it is as high as the 96 kHz from 24/192 PCM. But then again, does it matter to humans?


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