[plug]audio cds, was slowdown probs

[Mike Holland]

On Thu, 23 Aug 2001, alan howard wrote:

> if you have a signal generator , try changing from square wave to sine, you
> can hear a difference at 9 khz.

So you claim you can hear 27kHz ? Or is it just an imperfection in the
signal generator?

> also a square wave is made up of odd order harmonics, ie at 9khz it is 9khz +
>  1/3 27khz  + 1/5 45khz  etc sine waves.

OK. Then I'm even more skeptical.

  I should have mentioned, that the 9kHz square wave (or any signal)
should be put through a low pass filter before sampling, and so should
sample identically to a 9kHz sine wave, with an ideal filter. Is that
correct? If so, how does it make any sense talking about a 9kHz square
wave on CD?  (even if the ear can detect 27kHz)


-- 
Mike Holland  <mike at golden.wattle.id.au>
                          --==--
There goes the good time that was had by all.
                -- Bette Davis, remarking on a passing starlet