Distortion and Methods of Output Limiting

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Abstract
Output limiting, whether expressed throug hearing aid function as peak clipping or compression, is of considerable importance to those hearing impaired individuals utilizing amplification. The type of output limiting selected is determined by hearing aid user acceptance and is normally associated with maxim power output requirements. Growing awareness among audiologists and hearing aid dispenser of the need for clinical assessment of tolerance has led to a closer examination of maximum power output requirement and the most effective limiting method. As with any amplifying system, modification of design parameters to achieve desired limiting may involve a reasonable trade-off. Certainly, compression amplifiers introduce certain disortion products not normally found in peak clipping amplifiers. One of the principle problems to be resolved is the kind of amplification required versus subsequent distortion (whatever the type) and whether or not the trade off of signal fidelity for user acceptance is favorable. Output-begrænsning - enten i form af peak clipping eller compression - er af star betydning for den individuelle høreapparattilpasning. Blandt audiologiske fagfolk og høreapparatfor-handlere er der nu en voksende forståelse for, at høreapparatets maximum output séttes i relation til den enkelte hørehæmmedes tolerance og for betydningen af at udvikle effektive begrænsningsmetoder. Compressionsforstærkere forårsager forvrængning, som ikke findes ved linear forstærkning - til gengæld frembringer den lineære forstærkning en speciel harmonisk forvrærgning, som normalt ikke findes ved compressionsforstarkning. Et centralt spørgsmår i denne sammenhæng er, hvorvidt forvængningsproblemerne, som opstår i forbindelse med compression, er af underordnet betydning i forhold til fordelen ved at comprimere talen i relation til den enkeltes dynamikområae.

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