高性能听力测试系统的研制

Development of High-performance Hearing Test System

分析了现有纯音听力计存在的不足,提出了一种以新型DSP处理器实现纯音测听和言语测听功能的系统设计方法;该系统产生的纯音测试信号频率精准、信噪比高,总谐波失真度小。DSP自带的噪声发生器添加一级带通滤波器可实现窄带噪声的产生。同时,由于采用模块化的软件设计结构,使得该系统具有良好的易用性和扩展性。测试结果表明,该听力测试系统性能优良,可较好地应用于听力医疗诊断工作。

This paper analyzes the shortcomings of the existing pure tone audiometers,and proposes a system to realize pure tone audiometry and speech audiometry with a new DSP processor.The pure tone test signal produced by the system has accurate frequency,high signal-to-noise ratio,and small harmonic distortion.The noise generator that comes with DSP adds a band-pass filter to realize the generation of narrow-band noise.At the same time,due to the modular structure of software design,the system has good ease of use and scalability.The test results show that the hearing test system has excellent performance and can be better used in hearing medical diagnosis.