In message <d2251f0f290d4b1ab54e1a4dba345...@vectron.com>, "Bob Camp" writes:
>If you extend the bandwidth down low enough (as in low audio) the jitter >goes up quite a bit. In the case of audio, jitter at low frequencies just >might be something to worry about. Not with the kind of physical laws I live in. At low audio frequencies, say 100 Hz, you have at least 441 samples per period of audio, and the Y-difference from one sample to the next is so small, that no amount of jitter will have sonic impact. At a 20 kHz frequency however, you have sign reversal from sample to sample and moving a sample in X has very high impact on the energy of that and the surrounding samples. This is exactly why we use oversampling in the first place: You get more gentle slopes from sample to sample which means that the jitters effect is attenuated in the result. The place where this audio-jitter-homoepathy comes from, is the first generation of Philips CD players, CD-100 etc, which had "jitter" come up from the poor mechanics, because there were insufficient buffering before the de-interleaver. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be explained by incompetence. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
