Research On The Performance Evaluation Method Of Mobile Phone Noise Cancellation System

Mobile phone as an important tool of communication in today's society,its internal requirement for the performance of denoising system is higher and higher,how to determine cell phone denoising system is good or bad?How to evaluate its internal system used in the denoising algorithm effect?The existing evaluation methods can be divided into subjective methods and objective methods Subjective evaluation method is consistent with the intuitive feelings and overall evaluation of voice quality,but it takes a lot of manpower material resources,the evaluation process is very difficult to comply with the standard;Objective method is simple convenient,but not very good response the status of the voice quality.According to the faults of subjective and objective evaluation methods,this paper creatively put forward a new evaluation system.We use speech recognition rate to determine the mobile phone signal de-noising system's performance.it is not onlyunified standard,save manpower,but also can fully reflect the status of speech quality.In addition,the use of evaluation of speech recognition rate can also reflect the content of the conversation.Because the quality of sense and content is the most important feature of the phone for users.According to the sampling rate and the number of quantization bits of the existing speech recognition engine,we chose the clean speech and noise library.The program compiled to an audio processing will be wrote and put test function about the rate of speech recognition into the ACTS audio platform,and we connected the test platform and the recognition engine.Based on a virtual mobile communication network,we did lots of test with ACTS in different mobile phone,different types of noise and different noise-signal ratio,and got sufficient experiment data.Analysis the experimental data,we got the speech recognition rate under different testing conditions and the corresponding noise elimination performance.According to the experimental results,we got the function relation between the noise-signal ratio and the recognition rate,this function can bring great convenience to the mobile phone R&D and production,to avoid the repeated measurement,improve work efficiency.In addition,developers can test the de-noising system for mobile phone,through the measurable and unifiable speech recognition rate indirectly.