Digital Drive Upsamplers, DACs, jitter, shakes and analogue withdrawals, this is it.

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Re: Not sure I understand this phenomenon.

Posted by Werner (A) on March 7, 2007 at 02:18:59

In Reply to: Re: Not sure I understand this phenomenon. posted by PAR on March 4, 2007 at 16:01:21:

"As other posters have pointed out, this is probably really about the effect of digital filters, their intrinsic nature (type) and the frequency from where they are operational. High sample rates allow for them to be placed well above the 44.1 KS/s Nyquist point of 22.05KS/s with advantages IMHO."

Er, no.

Whatever the final sample rate of the DAC, with a CD input each and every 'standard' digital reconstruction filter has its transition band at 22.05kHz. The only relaxation is on the subsequent analogue low-pass filter which indeed can be at a much higher frequency as the preceding digital filter has already attenuated everything between 20kHz and the oversampled fs/2.

('standard' meaning filters obeying to the Nyquist/Shannon definition of reconstruction, as opposed to filters that allow some imaging in order to - somewhat misguidedly - show a faster time response, e.g. Wadia, Legato, ...)


bring back dynamic range

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