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Re: Re "Aliasing" . . .

Posted by Martin419 (A) on September 9, 2005 at 14:48:28

In Reply to: Re: Re "Aliasing" . . . posted by Max on September 8, 2005 at 18:59:01:

Indeed -- your theory would work exactly as you described if a perfect continuous sinuoidal 30kHz tone (i.e. above the new Nyquist folding frequency) was the input resulting in a continuous 18kHz alias frequency output.

But I don’t relax at home by listening to 30kHz sine waves, actually. Do you?

In any case, at low resolutions PCM has shortcomings EVEN when all the rules of Nyquist are perfectly obeyed. That’s precisely why we acknowledge that hirez does sound better than Redbook 44.1kHz across the human audio bandwidth (i.e. up to 20kHz).

But of course there is a trade-off: There are benefits of Nyquist anti-alias filtering prior to sampling (as you state), but there are negative side effects too. Indeed, it has even been suggested that above 88kHz, music actually sounds better and cleaner when no Nyquist filter is applied.

Likewise, the greater the process bit resolution, the less is the need for noise-shaping — since the aural significance of the LSB tends to zero with higher bit depth.

In short, theory and practice are different animals. What I have already described about downsampling is what I have experienced myself. As a result, 'uneven' sample rate conversion does sound worse to my ears -- with music -- than an 'even' one, filtering considerations notwithstanding, IMHO.

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Kimber Kable

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