To: WSFAlist at KeithLynch.net
Date: Thu, 21 Dec 2006 02:07:57 -0500
Subject: [WSFA] Re: Modems, and O.J. Simpson
From: ronkean at juno.com
Reply-To: WSFA members <WSFAlist at KeithLynch.net>

On Wed, 20 Dec 2006 23:38:07 -0500 (EST) "Keith F. Lynch"
<kfl at KeithLynch.net> writes:

... Just don't try to store modem signals as MP3s.  That trick never
> works.
>

To contrive a counterexample, I would think that 128 kbps MP3 mono could
successfully replicate a Bell 103 (0-300 bps async FSK) signal, given the
more than two orders of magnitude data rate overhead.

> Speaking of MP3, I discovered a new audio format at work this week:
> DSS.  Eight megs for three hours of speech is a very impressive
> number.  But the quality leaves a little something to be desired.

8 MB for three hours works out to 5926 bps, so that is an impressively
low encoded rate, considering that the slowest mono MP3 rate for speech I
have ever seen in use was 16 kbps.  And one does perceive a sound quality
degradation at 16 kbps MP3 relative to, say, 128 kbps MP3.  At 5926 kbps,
375 hours of speech would fit on a 1 GB memory module.  I think that
might be enough for one O.J. trial.

Ron Kean

.