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Consumer Electronics by S. P. Bali

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OTHER TYPES OF AGC

A large number of AGC types have been developed during the past decades. They all have the common purpose of automatically adjusting the gain and/or the frequency response of the hearing aid in accordance with the input signal and the user's dynamic range.

Multi-Channel AGC

In multi-channel AGC, the input sound is divided into two or more frequency channels, each of which has its own AGC circuit. Multi-channel AGC has the positive feature that a loud sound in one frequency band will not affect amplification in a different frequency band. On the other hand, there is a tendency for a spectral smearing diminishing spectral contrasts. Such smearing may have a negative effect on speech intelligibility, and hence hearing aid acceptance. ...

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