In article , Fleetie
wrote:
"Ian Bell" wrote
Tim S Kemp wrote:

Stewart Pinkerton wrote:

Whaaaat? That's rubbish, any modern 44.1k ADC is ruler flat to at
least 20kHz.

Never measured it, but the waveforms of perfectly audible stuff8khz
will be somewhat distorted at 44k sampling compared to higher rates.


Well I have measured it, and the distortion and I can tell you for a
fact that what you just said is definitely incorrect.

Well, he's more talking about Fourier theory, and from that standpoint,
he's right.


I disagree. For example, a 12 kHz sinewave is "perfectly audible stuff
sic above 8 kHz". Yet should be reproduced accurately.

As should any waveform composed of an array of components between 8 and
20 kHz that does not clip.

The point is that the recording (series of samples) should form a 'complete
record' if made according to the Sampling Theorem. This means that any
signals above 22 kHz will not be present.

So you can say, "not signal components above 22 kHz should be present". But
this does not mean your comment about "Fourier theory" explains what he
said w.r.t. "above 8kHz".

Slainte,

Jim

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