Hearing aid measurements with speech and noise signals.
An increasing number of hearing aid types include one or more features which are intentionally non-linear. In such devices measurement of frequency response and distortion using sweep tone measurements are typically of little relevance. Five different non-linear hearing aid types were used to evaluate three different broad-band measuring methods. The results revealed that these methods were meaningful in estimating average frequency response obtained with a specific input signal, but none of the three methods used in the study was able to evaluate separately the effects of the most important signal modifications: memoryless non-linearity like peak clipping, time-varying gain from AGC and additive internal noise.
Dyrlund
O
O
Technical-Audiological Laboratory, Odense, Denmark.
Ludvigsen
C
C
Olofsson
A
A
Poulsen
T
T
D004867:Equipment Design; D005260:Female; D006310:Hearing Aids; D006801:Humans; D008297:Male; D009622:Noise; D013067:Speech Perception