re : Auto Gain Control with DSP ??

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2 total messages Started by burdet Thu, 09 Apr 1992 14:44

#194

Author: burdet
Date: Thu, 09 Apr 1992 14:44

39 lines
2009 bytes

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
Message-id: <9204081844.AA05041@deimos.ads.com>
X-Envelope-to: burdet
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

Re: : Auto Gain Control with DSP ??

#200

Author: George Vokalek
Date: Sat, 11 Apr 1992 11:10

21 lines
1200 bytes

In comp.dsp you write:

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

Consult:

"On the design, implementation and performance of a microprocessor
controlled fast AGC system for a digital receiver."

by fred harris (yes, all lower case, he likes it that way) and
Gregory Smith.

Presented at Milcom-88, 1988 IEEE Military Communications Conference.

George 

---
George Vokalek,                                Dept. of Mechanical Engineering,
                                           University of Adelaide, GPO BOX 498, 
gvokalek@augean.eleceng.ua.oz.au                 Adelaide 5001, South Australia

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