Subject: Re: [linux-audio-dev] Re: streaming from disk to terminatorX added (via mmap)
From: Benno Senoner (sbenno_AT_gardena.net)
Date: ke loka 27 1999 - 19:29:24 EDT
On Thu, 28 Oct 1999, reactor/CTPmedia wrote:
> % Benno Senoner wrote %
>
> >% actually the interpolation algorithm of terminatorX fails when
> >% I load a 15kHz sine wave ( 0dB) into tX, and play it at a mere 103% speed
> >% ( 1.03) , there is nice aliasing noise, even if we are not violating Nyquist's
> >% theorem in this case.
> >% (15kHz*1.03 < 22kHz)
> >% Scratching this wave at fast speeds produces quite funny sounds,
> >% IMHO for best quality we should oversample at least 2x - 4x and lowpass the
> >% result:
>
> hmm, i'm surely wrong, but i think that the turntable doesn't have aliasing noises,
> because of it's ANALOG nature. remember, we try to scratch DIGITALLY now.
>
yes, we try to emulate the analog thing as close as possible,
therefore we must filter out aliasing noise and do a good interpolation when
"spinning" very slowly.
Benno.
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