Williamson M J, Cummins K L, Hecox K E
Project Phoenix of Madison, Inc., Wisconsin 53711-0287.
J Rehabil Res Dev. 1987 Fall;24(4):277-82.
Advances in digital technology and the associated introduction of new forms of distortion led us to investigate supplementary measures of electroacoustic distortion for hearing aids. Mathematical techniques were used to formulate a working model in which the hearing aid acts as a time varying linear filter. This model embodies an approach to separating distortion into perceptually relevant and irrelevant categories. Digitized speech was converted to analog form, routed through a commercial hearing aid, and the output of the aid was redigitized and stored. For a given input signal, output speech waveforms were then compared to the model output and performance measures were derived. Distortion was plotted in three dimensions to permit interpretation with respect to time, frequency, and amplitude. These results provide a more comprehensive and general format for the analysis of hearing aid distortion.
数字技术的进步以及随之而来的新形式失真的引入，促使我们研究助听器电声失真的补充测量方法。我们运用数学技术构建了一个工作模型，其中助听器充当一个时变线性滤波器。该模型体现了一种将失真分为感知相关和不相关类别的方法。数字化语音被转换为模拟形式，通过一款商用助听器进行传输，然后将助听器的输出重新数字化并存储。对于给定的输入信号，随后将输出语音波形与模型输出进行比较，并得出性能指标。失真以三维形式绘制，以便从时间、频率和幅度方面进行解读。这些结果为助听器失真分析提供了一种更全面、通用的形式。
