From: miron@extropia.wimsey.com
Date: Wed, 10 Feb 93 02:51:55 PST
To: cypherpunks@toad.com
Subject: Re: Compressed/Encrypted Voice using Modems
In-Reply-To: <9302071056.AA00916@ono-sendai>
Message-ID: <1993Feb10.101337.17788@extropia.wimsey.bc.ca>
MIME-Version: 1.0
Content-Type: text/plain


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sdw@sdwsys.lig.net (Stephen D. Williams) writes:

>Also, from a previous note, you wouldn't want to turn off V.42/V.42bis
>since that is where the error correction is.  Also, even on compressed
>data, you get some additional bandwidth because it does packetized 
>synchronous data.  This gets close to 8bits/byte instead of 10 (start,
>stop).

I think that you *do* want to turn off V.42.  V.42 does error
correction by using error detection and retransmission.  This
introduces variable delay and throughput, which are unacceptable in
a real-time application like voice.

I think that error correction through error correction codes is
the way to go.

- -- 
        Miron Cuperman <miron@extropia.wimsey.com> | NeXTmail/Mime ok
                       <miron@cs.sfu.ca>           | Public key avail
        AMIX: MCuperman                            |
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New signature on my key:

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