A channel is a digital filter or a series of digital filters cover a range of frequencies which is analyzed, processed, and reproduced by the hearing aid in the same manner. For example, a single channel hearing aid with a bandwidth between 250 Hz and 8000 Hz treats all incoming sounds within that frequency range as one sound.
Most signal processing features such as digital noise reduction, feedback suppression or cancelation, and multichannel directionality operate on a channel-by-channel basis.
Through gain handles, clinicians / audiologists / hearing care professionals will be able to adjust the frequencies either fully or partially for better hearing clearance and comfort to the wearer. Interton hearing aids come with an extra advantage where you can opt to view all the handles or some of it only in accordance with your preference and fitting needs.