Vocoder offers options optimized for quality, flexibility.May 20, 2009 -
Dual rate speech coder, G.723.1, complies with ITU-T standard and performs compression and decompression of 8 kHz speech signals. It encodes 16-bit PCM samples into 16-bit code-words, respectively yielding 10 or 12 code-words per 240 sample frames for 5.3 and 6.3 Kbps channels. Software has switchable transmission rates over 5.3 or 6.3 Kbps channels, providing 4 kHz of quality speech bandwidth. Voice activity detection (VAD) and comfort noise generation (CNG) are included.
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Original Press release
GAO Research Inc.
601 Milner Avenue, Suite 300
Toronto, , M1B 2K4
Canada
A New Version of G.723.1 Vocoder from GAO Research
Toronto, Canada - GAO Research Inc. (www.GAOResearch.com) has released its latest enhanced vocoder (G.723.1). GAO's G.723.1 dual rate speech coder complies with the ITU-T standard and performs compression and decompression of 8kHz speech signals. It encodes 16-bit PCM samples into 16-bit code-words yielding 10 or 12 code-words per 240 sample frames for the 5.3Kbps and 6.3Kbps channels respectively. This software has switchable transmission rates over 5.3Kbps or 6.3Kbps channels providing 4kHz of quality speech bandwidth. The higher bit rate has greater quality. The lower bit rate gives good quality and provides system designers with additional flexibility.
The ITU-T G.723.1 standard specifies a coded representation that can be used for compressing the speech or other audio signal component of multimedia services at a very low bit rate as part of the overall H.324 family of standards. This coder was optimized to represent high quality speech at the above rates using a limited amount of complexity. It encodes speech or other audio signalsin frames using linear predictive analysis-by-synthesis coding. The excitation signal for the high rate coder is Multipulse Maximum Likelihood Quantization (MP-MLQ) and for the low rate coder is Algebraic-Code-Excited Linear-Prediction (ACELP). Voice activity detection (VAD) and comfort noise generation (CNG), which are specified in Annex A, are also included in this version.Applications for this vocoder include video phones, audio/video conferencing, media gateways, etc.pr> For more information about this G.723.1 Vocoder, please visit www.GAOResearch.com or contact Sales@GAOResearch.com.
About GAO Research Inc.
GAO Research Inc. is a recognized international leading provider of communications software to telecom and electronics companies and provides the most comprehensive and unique suite of modem, fax, telephony, speech software, VoIP, FoIP, fax relay and fax/modem/voice relay software for embedded applications for DSP and microprocessors.
For more information please visit http://www.GAOResearch.com
1. GAO Research Inc. is a member of GAO Group, which also includes
2. GAO RFID Inc. - http://www.GAORFID.com
3. GAO Tek Inc. - http://www.GAOTek.com
4. GAO RFID Asset Tracking - http://www.GAORFIDAssetTracking.com
5. GAO Embedded - http://www.GAOEmbedded.com
6. GAO Instruments - http://www.GAOInstruments.com
7. GAO Comm- http://www.GAOComm.com
8. GAO Fiber Optics - http://www.GAOFiberOptics.com
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