The Measure Research Of Speech Quality Basing On Phase Diagram

It is crucial to evaluate accurately the degree of interfered speech signal by thecommunication jamming equipments, it’s an important topic in the field ofcommunication confrontation, the ideal approach on evaluation of the interferenceeffect is urgent and in great demand. It is a study trend to evaluate the degree ofinterference with speech signal objectively. The measure of speech quality basing onphase diagram is an objective interfered evaluation method, in the course it evaluatesthe degree of interference based on output disturbed signal, can effectively improvetest efficiency, and ensure the smooth progress of the task.This paper analyzes the characteristics of the speech signal, explains its workprinciple, physical definition and processing algorithm steps in time domain, mainlydiscusses the principle and its main applications of the subjectively and objectively;introduces Chaos theory and its common disposal means, and the basic concepts andalgorithm of cloud model and cloud theory. The phase space reconstruction is an usualtechnique in chaos dynamic system, as unknown complex system, according to theembeded theory, makes use of its time sequences without typical variables of system, itis valid to restruct and analyze a system in phase space for analyzing it’scharacteristics.The measure technique based on phase diagram assesses interference effectdirectly through output speech feature parameters, does not require the input andoutput synchronization, could make evaluate on the spot or postmortem，it’s flexible,easy and extensive practical, could fulfil requirement on interference effect. Thisproject uses the main idea of the state space reconstruction, analyzes the chaoscharacteristics of speech signal specifically, intercepts embedding dimension at scale invector space, establish speech two-dimensional phase space point diagram forinterference effect analysis. This paper analyzes speech phase diagram structural lawsin different disturbance intensity and different interference conditions, describesspeech disturbed degree with phase diagram structural changes, establishes thecorresponding relation between speech phase diagram and interfering intensity, summarizes its disciplines, the paper selects several representative parameters todescribe speech interfered degree. Finally makes speech signal preprocess, exclude thedata with gross error, deals the speech interfered signal with statistical analysis and testdata processing, summarized its application in the test. The whole project required theexpected results.