Research On Evaluation Method Of Noise Reduction Performance Of Hearing Aids Based On Auditory Masking Effect

Hearing aids are small amplifying devices used by hearing impaired people to compensate for hearing loss and hearing aids have become the most effective and reliable means of re-sensing speech in patients with hearing loss.In recent years,with the improvement of the level of research and development of hearing aids and the continuous improvement of technology,hearing aid products with more excellent performance and more powerful features are constantly emerging.Digitization,miniaturization and intelligence have become the inevitable trends in the development of hearing aids.Due to the uneven quality and performance of the hearing aid products currently on the market,in order to accurately evaluate the performance differences among different hearing aid devices,especially the performance of noise reduction in noisy environments,an accurate and reasonable hearing aid performance evaluation method.Based on the objective evaluation of the noise reduction performance of hearing aids,this paper improves the index based on the auditory masking effect of human ear and puts forward a set of normative evaluation schemes.The program includes the construction of evaluation system,the improvement of specific algorithms and the calculation and processing of experimental data.The experimental results show that the improved method proposed in this paper can evaluate the noise reduction performance of hearing aids more accurately.The main research work of this dissertation includes:(1)Through in-depth study of the basic characteristics of the speech signal,the basic characteristics of the noise signal,the noise reduction principle of the hearing aid is analyzed,and the objective evaluation index of the noise reduction performance of the hearing aid currently used is summarized.(2)For the domestic language environment,to build a speech library,including speech and phonetic sounds composed of phrases and phrases and four commonly used steady-state noise audio.The actual use of simulated hearing aids design hearing aid performance evaluation system and normative evaluation program.(3)Considering that in the field of objective evaluation of hearing aids,objective subjective evaluation has not been taken into consideration in the process of objective evaluation and there are some shortcomings.Therefore,this paper proposes to use the human ear auditory masking effect to improve the existing objective evaluation index.The masking threshold is calculated through MATLAB programming,and then the masking threshold is used to process the audio signal.Finally,the masked audio signal is used to calculate the improved evaluation index.(4)Select the same brand of high,medium and low-grade hearing aids as the test sample,the use of the built experimental platform,according to the method presented in this article objective comparison experiment,the analysis of the improved method proposed in this index can be more calculated results Accurately reflect the price trend of hearing aids to verify the proposed method is effective and feasible.