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From:	IN%"bhanafee@ads.com"  " (Brian Hanafee)"  8-APR-1992 20:46:53.01
To:	IN%"burdet@eig.unige.ch"
CC:	
Subj:	Auto Gain Control with DSP ??

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Date: Wed, 8 Apr 1992 20:44:18 +0200
From: " (Brian Hanafee)" <bhanafee@ads.com>
Subject: Auto Gain Control with DSP ??
To: burdet@eig.unige.ch
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X400-Originator: bhanafee@ads.com


>Hello
>
>I'm working on audio-prothesis and i have to implement an Auto Gain Control
>algorithm using DSP 56000 and using classical analog chip.

I've done this in the video domain.  I'm not sure from your posting
what you are interested in, but if you have more specific questions,
please email them.  The  system I built comprised an input A/D
converter, and three D/A converters on the output.  The three D/As
controlled an adder to zero out the pedestal voltage, a multiplier to
provide the gain, and another adder to add the desired pedestal back.
The gain control lagged by one video frame (e.g. gain for a given
frame was determined by the histogram of the previous frame), with
some hysteresis.

-- Brian


Brian Hanafee                         Advanced Decision Systems
bhanafee@ads.com                      1500 Plymouth Street
(415) 960-7300                        Mountain View, CA 94043-1230