Subject: Re: Frequency response was Re: [linux-audio-user] Audiophile CD's
From: Tony Lambley (tonyl_AT_vextech.net)
Date: Mon Jan 28 2002 - 19:27:46 EET
> > What happens when you sample a 1Hz sine with 2 samples a second, and
those
> > samples happen to coincide with the zero crossover points?
>
> That's why it's necessary to sample at f > 2b -- information is lost
> when there isn't a sample close enough to the peak/trough of the wave.
> I'm not sure how much greater than 2b f has to be, but apparently others
> have determined that 44.1khz or 48khz is high enough to reproduce
> frequencies up to 20kHz.
But doesn't that still leave a huge potential loss of information? Our ears
can't tell the difference between a sine and square at 20k, so a 44.1k or
48k sample rate is sufficient for a human intended audience.
Wouldn't fx algorithms be a difference case though?
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