Article View: comp.dsp
Article #1091Re: US Gov. sends real-time audio at 2400 baud!
From: Joe Buck
Date: Fri, 09 Nov 1990 18:31
Date: Fri, 09 Nov 1990 18:31
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1283 bytes
In article <PITARO.90Nov9085439@sleepy.uucp>, pitaro@rocket.uucp (Michael Pitaro) writes:
|> An example of a secure telephone is a STU III. It uses 1200 bps
|> LPC10-E for voice compression followed by encryption and a
|> REED-SOLOMON block code for error recovery. The voice quality is poor
|> but intelligible. I understand the government is going to upgrade the
|> STU III to use 2400 bps CELP voice compression. Motorola sells one
|> version of the STU III. I hear ATT sells another version.
Correct except that your rates are off by a factor of two. The LPC10-E
algorithm is 2400 bps; the federal standard CELP algorithm is 4800bps.
--
Joe Buck
jbuck@galileo.berkeley.edu {uunet,ucbvax}!galileo.berkeley.edu!jbuck
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Path: arc1-ca.pugleaf.net!utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!swrinde!zaphod.mps.ohio-state.edu!usc!elroy.jpl.nasa.gov!decwrl!ucbvax!galileo.berkeley.edu!jbuck From: jbuck@galileo.berkeley.edu (Joe Buck) Newsgroups: comp.dsp Subject: Re: US Gov. sends real-time audio at 2400 baud! Message-ID: <39484@ucbvax.BERKELEY.EDU> Date: 9 Nov 90 18:31:59 GMT References: <1990Nov8.210640.2893@ux1.cso.uiuc.edu> <PITARO.90Nov9085439@sleepy.uucp> Sender: usenet@ucbvax.BERKELEY.EDU Reply-To: jbuck@galileo.berkeley.edu (Joe Buck) Lines: 14