----- 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.
>
> > 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 !
> > Would there be any point
> > in saving such files as 44.1KHz audio before
> > converting to mp3 ?
>
> Probably not.
>
> > My (limited) understanding is that FM
broadcasts
> > are compressed before transmission and the
> > datastream is decoded by the tuner/receiver.
If so
> > what is the encoding process used ?
>
> There is usually compression involved but not
the way you think. The
> audio waveform is compressed before broadcast so
that the quieter parts
> are made louder. The only encoding/decoding
going on is for stereo
> transmission which I won't go into here.
Thanks for taking the time.
Eric
> MP3 ENCODER mailing list
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>
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