[time-nuts] Re: Accuracy of a sound card
phk at phk.freebsd.dk
Tue Aug 23 14:55:34 EDT 2005
In message <430B6A33.1090004 at erols.com>, Chuck Harris writes:
>No one has yet addressed the actual oscillator that is on board the sound card.
>What are they using on the Delta 44? ... the Aureon Sky? I would have much
>more confidence if they would at least use a cheap TCXO module.
Using a tcxo for a soundcard is the technical equivalent of using
twelve handpolished and individually goldplated railroad tracks for
loudspeaker cable: It would look impressive but be pointless.
The A/D converters used and the heavyhanded analog anti-alias
filtering means, that any sort term frequency change in the order
of 1PMM/minute is not measurable or hearable by any current means:
the phase difference only shows up as one nanosecond after 44 seconds
Poul-Henning Kamp | UNIX since Zilog Zeus 3.20
phk at 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.
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