Dissertation
Dissertation > Industrial Technology > Radio electronics, telecommunications technology > Communicate > Communication theory > Signal processing

Research of Digital Audio Stream Analysis System

Author QuanHaoJun
Tutor YangZhaoXuan
School Tianjin University
Course Signal and Information Processing
Keywords MP3 AC-3 AVS DRA Decoder Stream analysis
CLC TN911.7
Type Master's thesis
Year 2010
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Digital audio signal processing technology continues to evolve , has walked into people's daily lives , and greatly affect the way of life of the people . Variety of audio standards came into circulation with the requirements in order to meet the digital audio code . For MP3, AC -3 , the AVS and DRA audio standard , have been in different occasions to obtain a wide range of applications . In the study on the digital audio codec , researchers often need to assess optimized encoder encoding quality stream specification , and a decoder , decoding performance . Data manual records , inefficient and error-prone , and stream analysis will provide scientific and accurate data to help researchers improve work efficiency . Some audio software , however , multi- playback function and mainly for post-processing , can also provide some of the basic information of the decoding process , but this information can not meet the needs of professional researchers . At present there are a number of professional audio and video analysis software , but they are expensive and not comprehensive enough support audio standard . Stream Analyzer using pure hardware or software and hardware combined form , there are some flaws . MP3, AC-3, AVS and DRA audio decoder based on the structure of an optimized stream analysis system , and an audio stream analysis tools based on Microsoft's MFC framework . The tool has an audio player , waveform and spectrum display , the any frame stream analysis , data export and sound field simulation powerful , supports multiple audio standards and has good scalability . Analyzed and optimized system structure wherein the stream analysis , spectrum analysis and sound field simulation realization of the process of three main modules to be described in detail , and finally gives the system parameters and the experimental data . Experimental results show that the analysis of the audio streams of the tool is fully functional , high analysis efficiency and therefore has a high practical value .

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