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In Reply to: The Nyquist/Shannon theorum is one of the most mis-quoted and misunderstood concepts in audio! posted by TimNaff on April 13, 2001 at 23:11:56:
Hi: In the beginning of CD era oversampling was simply introduced as means to move analog filters away from 20-20.5kHz audible range due to their distortion. In your post you are attempting to bring discussion to connect over- or up- sampling with interpolation and improved resolution(If i understood your question). Its possible to "enhance resolution - make perception that resolution is improved" but in many areas of digital signal processing interpolations are considered to be fake as means of actual resolution improvment. Regarding FFT, as you well know, if you do not do it from minus infinity to plus infinity (which in reality of course is absurd) then you end up with imperfections and digital filters (if my spelling correct "Henning Window" for example) are needed. You are the first who states his empirical findings that real minimum sampling frequency is about three times then fastest in the sampe. Very interesting, indeed. At any rate,I am very sorry for bringing "analog filters" to your post I saw them as a part of oversampling discussion (starting from historical prospectives). My interest is DSD which, as I understand, at least in 2 channels, having 2.8MHz true sampling rate, does not need interpolation at all. According to published measurments it, however, brings noise, much greater then that of CD, (starting from about 10kHz). This,in turn requires... heavy filtering (eight pole filter in balanced SCD-1 Player, for example), and discussion went away a bit from oversampling/interpolation question you posted. Sorry again. Simon
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Follow Ups
- Interpolation - SimonTJU 21:18:35 04/15/01 (0)
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