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In Reply to: Re: Probably both. posted by Ted Smith on March 5, 2007 at 20:56:54:
Feedback signals have a time delay and time delays create different phase shifts at different frequencies. Unless this delay is very short, it is probable that these phase shifts start becoming audible.
Yes the impulse response of DSD is good but the charts that I have seen (on the internet) show only one frequency. If we run tones of different frequencies through a ADC and check the phase of the input & output tones, I suspect the relative phase changes will be visible although the impulse response will still be excellent. On an analog only system like vinyl or reel to reel that doesn't use much feedback, the phase information would probably be less compromised.This is only a hypothesis but in a system with less phase smear, Dave is able to hear the difference in absolute polarity much better.
Since most ADCs are sigma-delta I think the issue is not CD vs SACD vs analog but rather digital vs analog.
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Follow Ups
- Re: Probably both. - The Sound Guy 22:45:27 03/06/07 (1)
- Re: Probably both. - Ted Smith 22:52:59 03/06/07 (0)
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