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From: tprobe@most.magec.com (Ted Roberts)
Subject: Re: Which speech compression chip to use?
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Date: Thu, 6 Jul 1995 12:33:15 GMT
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In article <3tf1g5$ffb@ixnews5.ix.netcom.com>, 
uwe1@ix.netcom.com says...
>
>
>    I am trying to build a telephone answering 
machine which should be
>capable of storing speech compressed at about 10 
kbits/sec. Therefore,
>I need a DSP-based speech compression chip with a 
built-in CELP or
>subband coding algorithm (or equivalent -- not 
ADPCM). I have looked at
>two types of devices: 1) combination 
microcontroller/DSP chips such as
>the Zilog Z69C67; 2) peripheral DSP chip such as 
Dallas D2132 or DSP
>Group D6000 family together with external 
microcontroller.
>
>Additional features such as DTMF generation and 
decoding, RAM
>interface, file management, codec interface or 
built-in codec, UART,
>high clock speed, enough timers/interrupts, etc. 
would be helpful.
>Does anyone know of a good chip to use for this? Does 
anyone have
>experience with the chips I mentioned or others? Any 
advice would be
>appreciated. Thanks in advance,
>
>                                        -- Uwe 
Thomanschefsky
>
>
An Analog Devices ADSP-21xx series part would be a 
great choice.  Use the ADSP-2105 if cost is the 
primary consideration, or maybe the 21msp50 (which has 
on board sigma-delta A/D and D/A converters) if 
maximum integration is the goal.

Mark

