From: dionf@ERE.UMontreal.CA (Francois Dion)
Date: Sun, 7 Feb 93 09:13:29 PST
To: jim@tadpole.com (Jim Thompson)
Subject: Re: Compressed/Encrypted Voice using Modems
In-Reply-To: <9302071001.AA00783@ono-sendai>
Message-ID: <9302071709.AA28201@brise.ERE.UMontreal.CA>
MIME-Version: 1.0
Content-Type: text/plain


Beyond the ultraworld of Jim Thompson:
> 
> 
> > From: Peter Shipley <shipley@tfs.COM>
> 
> > at Interopt I heard some voice demos that were at 9600 4800 and 2400 baud
> > the 2400 sounded a phoneme chip but was *very* resionable.
> 
> Quite likely what you heard were 9600/4800/2400bps (bits per second),
> not baud.  The two are different.  2400bps compression of voice is
> quite a bit beyond current GP CPUs.

Well, almost true. 9600 baud !=9600 bps in modems. 9600 bps modems are actually
2400 token per seconds, with each token beeing 4 bit long. 2400 bps modems
are also 2400 bauds (token per seconds) like the 9600 bps modems, but with each
token beeing 1 bit.

> Also, note that 9600 baud (V.32 carriers) are based on a 2400bps carrier.

No, it's the inverse 9600 bps are based on 2400 baud.

> (And if they're not, I'm sure someone will correct me.)  2400 baud modems
> are based a bit rate something less than 2400bps, though I can't remember
> exactly what it is right now.

No, a 2400 bps modem is 2400 baud because each token is 1 bit long.

Ciao,
-- 
Francois Dion
    '  _   _   _ 
 CISM (_) (_)  _) FM       Montreal , Canada       Email: CISM@ERE.UMontreal.CA
      (_)  / . _)             10000 Watts          Telephone no: (514) 343-7511
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