Driver Design And Algorithm Implementation Of Digital Hearing Aid Platform Based On DSP

Digital hearing aid is the main means of hearing impairment for patients with hearing loss.It is of great significance to improve the recognition and communication ability of the patients.The development of the traditional analog hearing aids is very mature,but there are some insurmountable problems.These problems includes large power comsumption,fittable crowd narrow,low environmental adaptability,non personalized gain compensation and other issues.The use of digital hearing aid instead of analog hearing aids can effectively compensate for these shortcomings.At present,independent research and development of digital hearing aid technology is relative scarce.Therefore,the research of digital hearing aid is of great significance,and digital hearing aid products have broad market prospects.Through the analysis of the principlea and application of digital hearing aids,this paper selects C5535 e Zdsp USB development kit as the development platform of digital hearing aids.To use this platform to realize digital hearing aid function,this paper designs related drive for the platform,which includes TLV320AIC3204 driver configuration,DSP5535 I2 S driver configuration,DMA driver configuration and the driver realization of bootloader.After the configuration of the driver,the digital hearing aid platform can transmit the external sound to headphone end in real time,and reserves the array interface for the subsequent speech processing algorithm.According to the audio signal processing of digital hearing aid and the requirement analysis of hearing aid function,this paper introduces three kinds of speech processing algorithms.Three speech processing algorithms include : automatic gain control algorithm,frequency shift algorithm and wide dynamic range compression algorithm.Through the analysis of the basic principles of the three algorithms respectively,three algorithms are simulated by MATLAB;the feasibility of the algorithm is verified.On this basis,the paper implements the three speech processing algorithms in the digital hearing aids platform;and based on the characteristics of the platform,some optimizations are made.After the optimization of the algorithm,the running time of the algorithm is significantly reduced,which is of great reference value to improve the real-time performance of the digital hearing aid.