When distortion occurs, hearing aids produce undesired elements at the output through the interaction of the processed signal with some internal non-linear mechanism. The intention of this issue is to explain why distortion occurs in some hearing aids to explain how distortion is measured to summarize what can be done to prevent distortion and to summarize the perception of distortion by the hearing aid wearer.Дistortion in hearing aids can be broadly defined as the generation of undesired audible components that are present in the output, but which are not present in the input. The topic of distortion is the subject of this issue of Trends in Amplification. This is a subtle way of saying that, among other things, well-fitted hearing aids should not distort the desired sound. This indicates that it is important that the hearing aids produce no alteration of the signal other than that which the fitter intends. The third guideline- do no harm-is less obvious. The second ensures that discomfort level is not exceeded, so that the user does not wince or remove the hearing aids when loud sounds are present. The first is to present sounds above the user's threshold of hearing in order to create an acoustic environment with the maximum amount of audible speech cues. The first two of these three guidelines are obvious. Do no harm so that the amplified signal is not unintentionally or undesirably altered by the hearing aid.

Clipping detector circuit limitations