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Conference Paper
G.729.1 광대역 음성 코덱을 응용한 MoIP 단말 구현
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- 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, Fixed-point, High performance, ITU-T, Mpeg-4, Multimedia Communication, Multimedia over IP, Quality value, Recent Trends, Run time