TI DSPS 3rd Party Listings: Telecommunication Algorithms: Voice Activity Detection and AGC

Digital Signal Processing Solutions Tools: Telecommunication Algorithms

Product Name:	Voice Activity Detection and AGC
Company Name:	D2 Technologies, Inc.
Features & Benefits:	VAD classified voice activity as early or sustained according to user specs Adapts to different background ambient noise Adapts to echo when used with D2's NEC Assigns an effort level to the voice activity Adjusts voice signal to a specified target Accepts telephone band codec or linear voice data
TMS320 Devices Supported:	C2xx C5x C54x C6x
Data Rate (kbps):	8
Program Memory (k word):	0.07
Data Memory (k word):	144
Processor Loading (MIPS):	0.18
Target Platform:
Hardware Requirements:	None.
Word Size:
Clock Rate:
Group Delays:
Technical Support/Training Available:	YES 90 day warranty period plus optional design consultation, algorithm development, system integration and training services available.
Overview:	D2's Voice Activity Detection and AGC (VAD AGC) algorithm module detects voice activity and adjusts the voice signal to a target power level. The VAD AGC algorithm adapts to background ambient or line noise as well as the presence of echo, classifying voice activity as "early" versus "sustained" and assigning an "effort level" to the speaker that is independent of network loss. The AGC algorithm adjusts the voice power level to a user specified target within a user specified time constant. The AGC is integrated with the Voice Activity Detect algorithm to ensure that background noise or echo does not get amplified up to the specified target level.
Ideal Performance:	Integrated with other VP Open modules and tested for concurrent real-time processing on multiple voice ports.
Algorithm Verification:	Half duplex speech detection tests with taped male and female speech that simulates voice messaging and two way conversational activity at different noise levels, Full duplex speech detection tests with two tapes that simulate two way conversation tested with the echo cancellation active, VP Open interface validation.
Availability:	C5x, C54x - Available, C2xx, C6x - Consult D2
Operating System Used:	VP Open specifications
Tools Supported By:	TI, White Mountain, DSP Research, Go DSP, National Instruments.
Company Information:	D2 Technologies, Inc. 104 West Anapamu Street Santa Barbara CA 93101 USA Tel: 805-564-3424 Fax: 805-966-2144 e-mail: sales@d2tech.com www: http://www.d2tech.com
	Voice processing solutions provider for computer telephony. Over 20 years of industry experience in algorithms, DSP implementation, real-time systems, and telephony system integration.