[EMAIL PROTECTED] wrote:
>
> Magic hits the PRINT key when he sees what Ralph Smeets wrote:
>
> > Hmm,
> > some DSP theory (applied in ALL MD equipment cappable of A/D D/A coversion (a
> > little bit simplified in order to keep the mathematic mungle out):
>
> <snip complicated maths stuff>
>
> Ok, so it works vastly different from PC sound cards (the majority of which make
>things square
> off at low sampling frequencies). However, regardless of what happens to the end
>result, isn't
> the point that this type of distortion would effect the overall sound at these
>frequencies? It
> doesn't really make much difference if the end result is a triangle, square, sine,
>inverse sine,
> or wobbly sine with a pimple on top - the point is that it has changed the original
>wave form.
A cut-off at 20kHz before sampling is quite acceptable since:
1) speakers that go over 20kHz are quite expensive
2) Amplifiers that go over 20kHz are quite expensive
3) Ears that go over 20kHz are quite expensive.. ahum. rare..
4) We don't want our dog/cat go wild when we play music.
Cheers,
Ralph -> who's happy because his parents are visiting him....
--
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Ralph Smeets Functional Verification Centre Of Competence - CMG
Voice: (+33) (0)4 76 58 44 46 STMicroelectronics
Fax: (+33) (0)4 76 58 40 11 5, chem de la Dhuy
Mobile: (+33) (0)6 82 66 62 70 38240 MEYLAN
E-Mail: [EMAIL PROTECTED] FRANCE
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"For many years, mankind lived just like the animals. And then
something happened that unleashed the powers of our imagination:
We learned to talk."
-- Stephen Hawking, later used by Pink Floyd --
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