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Conference Paper G.729.1 광대역 음성 코덱을 응용한 MoIP 단말 구현
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Authors
소운섭, 황인기, 구기종, 김대호, 김도영, 김대영
Issue Date
2007-11
Citation
전자 정보 통신 학술 대회 (CEIC) 2007, pp.148-151
Publisher
대한전자공학회
Language
Korean
Type
Conference Paper
Abstract
We developed a high quality Multimedia over IP(MoIP) phone as a consumer electronics device to support recent trends of high quality of services for multimedia communications. For this purpose we chose a high performance RISC application processor having DSP features and enhanced Multimedia Accelerator(eMMA) function. In the implementation of this phone, we used G.729.1 codec recently standardized in ITU-T which is a new scalable speech and audio codec that extends G.729 speech coding standard. For video we applied H.263/MPEG-4 codec which is supported by the eMMA with hardware in the processor. To adopt G.729.1 codec to this phone we transformed most of the fixed point C codes to assembly codes so as to minimize processing power in the processor. As a result of this work we reduced the processing run time of the C codes over 90%. In the SIP call processing test we obtained under 100ms voice delay and 3.8 MOS quality value and 15 fps CIF video frame..
KSP Keywords
Audio codec, Coding standard, High performance, ITU-T, Mpeg-4, Multimedia Communication, Multimedia over IP, Processing power, Quality value, Recent trends, Run-Time