What is a channel in a hearing aid?

Answer 1

The frequencies which the human ear can hear are from approximately 1 Hz to about 16000 Hz (cycles per second) for most hearing aids. When this band of frequencies is split up into smaller bands, say, for example, 1000 Hz wide, the hearing aid now has 16 bands or "channels". This is done because the greater the number of channels, the more accurately one can modify the gain selectively in each channel to improve the ability of the hearing impaired person to hear frequencies where he/she has impaired hearing. I got this answer from an engineer at audiotoniq.com