便携式听力自我监测系统的研发和初步评估

Design and Preliminary Assessment of a Portable Self-Hearing-Monitoring System

目的：开发一种便携式自我听力监测系统，并进行了初步临床评估。方法采用ThinkPad笔记本电脑、Cre-ative声卡、ER3A插入式耳机以及自制音频转换器建立起便携式听力自我监测系统。开发配套系统软件并校准信号输出强度。系统建立后，首先通过小样本正常人预实验发现系统设计中存在的重大问题并进行调整。系统经过改进和调整后，在18例（36耳）听力正常人中进行纯音测听听阈与自测听阈的对比。每位受试者分别进行测听室内的纯音测听和软件自测。计算各频率阈值差值。结果获得了便携式自我听力监测系统的原型机。经过调整的系统自测结果与纯音测听结果总体吻合度较好，特别是250～4kHz偏差较小（各频率总体偏差值分别为-1.81±8.29、-1.81±7.09、0.56±6.95、3.33±5.35、1.94±6.68、3.47±5.71 dB）。但125、6k、8kHz偏差较大（125 Hz偏差值为-6.11±8.29 dB；6 k、8 kHz偏差值分别为-5.28±6.54、-3.33±6.87 dB）。环境噪声对测试结果有一定影响。结论便携式听力自我监测系统提供了一种便捷的自动测听方法，需进一步验证可靠性。

Objective To design a portable self-hearing-monitoring system and to evaluate its reliability. Methods A portable self-hearing-monitoring system was composed using a ThinkPad laptop computer, Creative soundcard, ER3A insert phones and custom audio convertor. Custom software was developed and the test signals were calibrated. The original prototype was tested in small-sampled pre-assessment for major hardware or software flaws and led to revision of both software and hard-ware. A test-reliability assessment was then done in 18 normal hearing people （36 ears）. Hearing thresholds in each subject were tested by regular pure tone audiometry in sound proof booth and by self hearing test as well. The thresholds at all frequen-cies from both methods were compared for differences. Results A prototype portable self-hearing-monitoring system was esteb-lished. Thresholds obtained by the self-hearing-monitoring system and pure tone audiometry fit well with each other between 250 Hz and 4 kHz （the difference was-1.81±8.29,-1.81±7.09, 0.56±6.95, 3.33±5.35, 1.94±6.68 and 3.47±5.71 dB, respec-tively）, although discrepancy was noticed at 125 Hz （-6.11 ± 8.29 dB）, 6 k Hz （-5.28 ± 6.54 dB） and 8 k Hz （-3.33 ± 6.87 dB）. Ambient noise seemed to affect the test results of the system. Conclusions The portable self-hearing-monitoring system pro-vides a new convenient method for automatic audiometry. Test reliability of this system should be further evaluated.