GAO Automatic Gain Control
by GAO Research & Consulting Ltd.

Software Overview

GAO Automatic Gain Control (AGC) algorithm is designed for speech-processing applications. It 
adaptively controls the dynamic range of a speech signal without amplifying the noise between words 
and phrases. It consists of two parts: voice activity detection and gain control. 

Features and Benefits

•	Implemented in the assembly
•	Low data and program memory requirements
•	C-callable and assembly-callable function
•	User-selectable depth and envelope of the gain control

Processor and System Requirements

•	Devices supported: TMS320C3x, TMS320C5x, TMS320C54x
•	Algorithm category: Telecommunications
•	Required:
Function
Average MIPS
Data Memory
Program Memory
AGC
0.2
100
500

Algorithm Verification

•	The algorithm has been field tested.

Availability

•	The software is available now and demonstration is available at GAO's offices in Toronto, Canada.

Company Background and Contact Information

GAO Research & Consulting Ltd. is an established international supplier of DSP algorithms, 
software, and systems for the telecommunications market. It provides a complete line of telephony, 
fax, and modem solutions. Its products have been widely reported by over 30 leading publications in 
the industry.
GAO currently employs about 20 DSP engineers. It was founded in 1991 and has been managed by Dr. 
Frank X.Y. Gao.
Contact:	Dr. Frank X.Y. GAO, CEO
		GAO Research & Consulting Ltd.
		55 Nugget Avenue, Unit 204
		Scarborough,  Toronto
			Ontario, Canada M1S 3L1
		(416) 292-0038
		Fax: (416) 292-2364
		e-mail: gao@io.org
		www: http://www.io.org/~gao