Research On Technical Control Method For Improving The Accuracy Of Subjective Evaluation Results Of Speech Purpose Hall

At present,there are two evaluation methods of speech purpose hall,subjective and objective,among which subjective evaluation is the basis of final judgment,which plays an important role in the design and evaluation of speech purpose hall.Factors influencing the accuracy of the sound language hall subjective evaluation results,a lot of,in the practical sound field,often will test the location of the room impulse response or ears are extracted from impulse response,using convolution,mix signal synthesis methods,such as the preparation of signal,the subjective evaluation to eliminate the limitation of time and place,but the loudness and relative sound pressure level of synthetic signal will produce large error,the result of subjective evaluation is not accurate;Subjective evaluation test voice in addition to being able to get in the actual sound field,can also with the aid of sound field simulation,evaluate the unfinished hall listening to the sound effect,but due to the limitation of current technology,the simulation software can't completely simulate the propagation and attenuation of sound in real sound field,in the actual operation,the simulation model of precision directly affects the accuracy of the subjective evaluation results.In this paper,a series of technical control methods are proposed to improve the accuracy of subjective evaluation results.The main work of the thesis includes the following parts:(1)Systematic combing and research on four representative subjective evaluation methods for speech purpose hall.(2)Research on the effectiveness of Odeon simulation software,and propose a series of technical control methods to improve the accuracy of subjective evaluation results of simulated sound field.(3)Two types of internationally recognized loudness calculation models were studied,and their effectiveness and errors in calculating the total loudness of Chinese speech materials were compared.(4)In order to make the four subjective evaluation indicators operate under a unified framework,this paper builds a subjective evaluation system,which is implemented by using MATLAB programming language to improve the practical significance of the application of the subjective evaluation method of the language auditorium.The technical research results of this paper have been well verified and applied.(5)Applying the subjective evaluation system constructed in this paper to subjectively evaluate the simulation and actual sound field,and fit the subjective evaluation index with the objective evaluation index.This paper starts with the technical research to reduce the subjective evaluation error,systematically combs and studies the subjective evaluation method,and proposes a series of quantitative control methods for the systematic error of the subjective evaluation method in simulation and actual sound field,and in four subjective On the basis of the evaluation method,a comprehensive and reliable subjective evaluation system for the language hall is constructed to evaluate the language sound transmission effect of the room.The subjective evaluation test system developed in this paper increases the reliability of the subjective evaluation results of the language auditorium,and adds practical significance to the promotion and application of subjective evaluation indicators.It has good guiding significance in engineering practice and scientific research.