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. Also I
saw a claim that FM has a frequency cut-off at
14.5KHz - is this true ? Would there be any point
in saving such files as 44.1KHz audio before
converting to mp3 ?
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 ?
Thanks
Eric
----- Original Message -----
From: Robert Hegemann <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Wednesday, July 12, 2000 4:10 PM
Subject: Re: [MP3 ENCODER] 32 or 44.1kHz for 128
kbit/sec mp3s fromsoundcard?
Christian Schepke schrieb am Mit, 12 Jul 2000:
> Are we talking about bandwidth or sampling
frequencies ?
> I think meant was to lower the sampling
frequency from
> 44.1 kHz (frequencies - 20 kHz) to 32 kHz
(frequencies - 16 kHz).
> Imho it would make no sense to resample a CD
(44.1kHz) and encode it then.
> (Btw. Is 32 kHz a valid samplerate from the ISO
specs ?)
YES, 32 kHz is a valid samplerate from the ISO
specs.
( MPEG 1: 32, 44.1, 48 )
> It's easier and also quite efficient to lowpass
at 16 kHz and encode it
> then to mp3.
> The problem with the resampling is not only the
time it takes more to encode,
> it's also quite annoying to get the noise from
the resampling routines ...
I think the original point was, if there is a
lowpass around 16 kHz,
would it be better to start with a 32 kHz or a
44.1 kHz source material.
>
> A+
> Christian
>
> --
> Christian Schepke Tel.: +49 (0)231 39 88 99 3
> Lehrstuhl fuer Kommunikationstechnik
> Universitaet Dortmund
[EMAIL PROTECTED]
Ciao Robert
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