[plug] slowdown probs

[John Knight]

To all those of you that are thinking that the human ear can only hear 44 
khz, you're wrong. This was what was found in the 80's when CD audio was 
being developed but has been proven to be incorrect in the last few years. 
What the scientists at the time didn't account for was that the inner-ear 
can make out some more frequencies too.

This spurred on technologies like the Sony Super CD and eventually DVD audio 
which runs 48 khz.

Yes, there are problems in converting CD to mp3. Those of you that have used 
CDEx (I hope I got the caps right) would know that there is a high quality 
setting with the warning "May cause ringing artifacts". I've tried this out 
before and most of the songs DID have them.

Anyway, you'll notice that on a low bitrate mp3 (say 128), it sounds "dirty" 
in comparison to high bitrate one (192 onwards). I'm NOT an expert on this 
sort of thing (I've got a brother that's in the know with this stuff), so 
that's all I can bring to the discussion I'm afraid.

John Knight

>
>On Wed, 22 Aug 2001, alan howard wrote:
>
> >  unfortunatly cd audio is just as bad. a 44khz sample rate ( normal cd ) 
>will
> > not correctly resolve a 9khz square wave
>
>Alan, nor will the human ear. Are you making recordings for animal
>behaviour research :)
>   IIRC, a fourier analysis of a square wave, shows a 9kHz sine wave (which
>you hear) plus 18kHz, and higher harmonics, which you'd hear little or
>nothing of. Both the CD and MP3 standards are designed with the human ear
>in mind. Just as GSM etc are designed for human voice.
>
>   Is there any special problem converting CD to MP3? e.g. some artifact of
>the sampling rate?
>
>--
>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
>
>


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