From: paul@poboy.b17c.ingr.com (Paul Robichaux)
Date: Wed, 11 Aug 93 15:02:06 PDT
To: norm@netcom.com (Norman Hardy)
Subject: Re: Secure voice software issues
In-Reply-To: <9308112136.AA16886@netcom3.netcom.com>
Message-ID: <199308112153.AA04326@poboy.b17c.ingr.com>
MIME-Version: 1.0
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This was discussed a while back in the context of secure voice
hardware, but I don't remember whether anyone had been able to get
real-time CELP performance with any particular implementation.

I do know that ZyXEL's modems are able to do real-time CELP using a
68000 processor. The low-end models can do CELP encoding at 9600 baud,
and the faster ones do better-quality encoding (ACELP, I think they
call it) at 19200 baud.

The Mac OS also includes Apple's sound compression routines, which
aren't CELP (i.e. they're not optimized for voice) but allegedly can
do real-time compression.

-Paul

-- 
Paul Robichaux, KD4JZG     | "Crypto-anarchy means never having to say
perobich@ingr.com          |  you're sorry." - Tim May (tcmay@netcom.com)
Intergraph Federal Systems | Be a cryptography user- ask me how.