A Design And Realiza Of Voice Quality Evaluation System Of Communication Network Based On PESQ Arithmetic

Voice quality evaluation of communication network is a basis and kernel issue toanalyze and improve voice quality, but also is one of the means to test and optimize thecommunication networks. Subjective Mean Opinion Scores must ensure thatthe selected population is large enough and representative prominent for study, theshortcomings of this method are low efficiency, high cost, serious waste of humanresources, less agile, less stable, and the great impact fromthe subjective factors. Existing systems of objective voice quality evaluation are able toovercome the poor stability and low efficiency characteristics, but also to avoid theimpact of individual differences in subjective, but still can not meet market demand inthe flexibility and cost.A sort of voice quality evaluation system of communications network basedon PESQ arithmetic is designed in this thesis. The system can reflect thevoice quality of communications networks accurately by the MOS from PESQarithmetic. And it actualizes the mode of automatic work and thesimultaneous multi-channel signal testing by using telephone signal tone controltechnology and multi-threading technology. And, the analysis for the PESQarithmetic performance shows that the PESQ arithmetic is able to meet therequirements of the system. Papers focus on discussing the side of the customerservice center design and implementation of the whole system, specifically, mainlyfor the following aspects of the work:First, the paper describes the overall design of voice quality evaluation system andthe structure of the system’s hardware components. It expounds the design ideas ofthe customer service center terminal particularly, and analysis the roles of variousfunctional modules and data processing process. At the same time, the paper bringsforward the hierarchical model of the customer service center, and indicates that thefunction of each level and and methods and the interface of data exchange between alllevels.Secondly, the paper conducted a study on the PESQ arithmetic, explained the basicprinciples and calculation steps of the PESQ arithmetic. It focus on that analyzes theperformance of the PESQ arithmetic, and proposes the access method for the analysisof voice samples, and designs the experiment for analysis. The study of experimentaldata demonstrates the conclusion which is that the PESQ arithmetic can simulate thesubjective feeling of human to the maximum extent, and this arithmetic is suitable forusing in the system. The paper proposes for code word of synchronization which issuitable for the system, and determines the synchronous program after contrast, andcarries through the simultaneous testing.Thirdly, the paper describes specific methods to achieve the system. It describes the phone tone using in the customer service center terminal, and offers the processingflow of the system for each tone. The paper proposes all of system’s status of thecustomer service center terminal, and explains each job needs to be done in detail ineach status, and gives the concrete implementation. It describes the design project ofsystem interface for the customer service center terminal, and analyses several issueswhich affect robustness of the system, and offer the ways to solve them. At last, we testthe system across-the-aboard, and show the results from the testing. According to theresults, we prove functions of the system to achieve the design requirements.Finally, the paper summarizes the advantages and disadvantages ofthe research approach, and proposes a further expansion of research. Be notedthat this design of the voice quality evaluation system does not rely on thecommunication network standard; therefore, the system is applied to both the militarynetwork and also for three civilian network provider. It is all-purpose, and has the broadmarket prospect.