Toronto, Ontario Canada (PressExposure) April 09, 2012 -- GAO Research Inc. ( http://www.GAOResearch.com ) is offering its Voice Activity Detector (VAD), Comfort Noise Generator (CNG) software which is used to reduce the transmission rate during silentperiods of voice transmission.The system, allowing discontinuous transmission, ise based on a Voice Activity Detection (VAD) algorithm and a Comfort Noise Generator (CNG) algorithm that allows the insertion of an artificial noise during silent intervals.
This feature enables it to effectively avoid noise modulation introduced when the transmission is switched off. If the background acoustic noise presented during active periods abruptly disappears, the noise modulation may reduce the intelligibility of the speech. The purpose of the VAD is to reliably detect the presence or absence of speech and to convey this information to the CNG algorithm. The purpose of the CNG algorithm is to create a noise that matches the actual background noise with a global transmission cost as low as possible.This software is implemented in assembly or C. It features user-callable functions and is able to work with all speech vocoders.
This Voice Activity Detector (VAD), Comfort Noise Generator (CNG)belongs to GAO's family of Voice over IP software. Other products in the line include Digital Network Echo Canceller (ITU-T G.168) which is used for reducing the echo by digitally subtracting an estimated echo from the circuit echo,Dual Tone Multi-Frequency (DTMF) Softwarewhich has a variety of uses in telephone systems.andAutomatic Gain Control (AGC) Softwarewhich is designed for speech processing applications. GAO VoIP software halves the transmission bandwidth by recognizing the periods when a party is silent and ceasing transmission during those periods. Comfort noise generation is also provided.
About GAO Research Inc.
GAO Research Inc. (www.GAOResearch.com) is a world-renowned provider of high quality, reliable telecommunications software including embedded modem software, fax modem software, speech codes, and telephony software for a wide range of DSPs and microprocessors.