"Eric.Howgate" wrote:
>
> ----- Original Message -----
> From: Ross Levis <[EMAIL PROTECTED]>
> To: <[EMAIL PROTECTED]>
> Sent: Friday, July 14, 2000 5:46 AM
> Subject: Re: [MP3 ENCODER] 32 or 44.1kHz for 128
> kbit/sec mp3s fromsoundcard?
>
> > "Eric.Howgate" wrote:
> >
> > > Whilst sample rate is up for discussion, -
> could
> > > somebody confirm what is the quality of
> broadcast
> > > FM music is in terms of sample rate ? When
> > > recording from the radio via line-in Cool Edit
> > > shows the source as 16 bit stereo @ 32KHz.
> >
> > It is an analogue (analog for you Americans)
> transmission so there are
> > no sample rates. Although a lot of radio
> stations would be using 16-bit
> > 32khz internally for storage on hard disk.
>
> I believe the UK Classic FM station use the
> original music CD for transmission (they
> simultaneously broadcast in digital radio
> format ), but if (on my PC) the source is analogue
> via line-in then any wave editor will just be
> guessing at the sample rate ?? I can tell it to
> assume the source is 44.1KHz.
You don't guess. You set the sampling rate of the card
to some value and then sample the analog signal at that
rate. You usually set the rate in some preferences dialog
in the editor and then hit the record button ( also in the
editor ). Now if the editor forgets the rate you set , then
use another editor :-)
> >
> > > Also I
> > > saw a claim that FM has a frequency cut-off
> at
> > > 14.5KHz - is this true ?
> >
> > In New Zealand and most countries the cut-off is
> 15khz.
>
> This would be strange behaviour for a station
> specialising in classical music !
For stereo you must not exceed 19 kHz , because that is the
position of the 'pilot' signal, needed for stereo decoding.
David Balazic
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