Dissertation
Dissertation > Industrial Technology > Radio electronics, telecommunications technology > Communicate > Electro-acoustic technology and speech signal processing > Speech Signal Processing

Audio and Video Subsystem Design and Implementation on Video IP Phone Platform Based on Davinci

Author WangYuanLiang
Tutor LiYunJun
School Yanbian University
Course Applied Computer Technology
Keywords Davinci Visual telephone Audio driver Video driver
CLC TN912.3
Type Master's thesis
Year 2009
Downloads 43
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Has been considerable progress with the development of the video signal processor , audio and video processing technology . The rising demand for audio and video communication , social good opportunity for the development of proprietary applications in the field of demand for visual communication and video conferencing to bring visual communications . Videophone use of PSTN and Ethernet data transmission deficiencies due to the PSTN bandwidth , Ethernet has become the only choice of high - quality communication videophone . Currently embedded processor frequency is generally not high in terms of performance , it is difficult to meet the high-quality real-time video communications , audio and video algorithms run need . In terms of design , the videophone generally use separate design of multi-chip , chip brought bad compatibility between design difficulty and high cost , and can not meet the high bandwidth board-level audio and video data transmission problem , resulting in real - time video telephony is not good , the audio quality is not high , and the high cost . This article Davinci processor and the VDP research and analysis on the basis of a Davinci 's IP videophone terminal . First of all , the by EDMA way transmission of audio and video data , using RAM - based caching mechanism to solve the problem of data transfer rate ; Secondly , the use of the advantage of its chip VPSS video processing , video processing part driven rewritten to achieve video capture and playback stage processing of video data to improve the efficiency of video capture and processing stages to improve the real-time nature of the videophone ; once again , rewriting and tuning drive external audio interface chip AIC32 audio mode a processing function of the digital conversion stage , in the acquisition phase , fine-tuning, improved audio quality ; Finally, through the external video capture interface chip TVP5146 driver to complete the adjustment of the video quality of the video analog to digital conversion stage , improved video capture video stage quality. After the actual test results show that the improved real-time video , basically meet the real-time requirements . Video playback resolution of the pseudo- D1 level , improved video quality compared to existing videophone . The audio quality is good , reach of ordinary MP3 playback .

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