The Bluetooth linkage makes it possible for the person using the hearing aid to selectively adjust volume and perform other features (e.g., answering a mobile phone). Many hearing aids also have a Bluetooth link that can be used with a mobile phone or entertainment appliance (TV, DVD, music player) ( Palmer, 2009). These and other features are often controlled through a handheld remote control. Volume levels can be adjusted for each ear independently. Directional microphones can be adjusted to have an improved signal-to-noise ratio in certain directions (e.g., the side, front or back of the user).
For example, there are programs that amplify speech selectively in a noisy environment.
This provides the possibility of canceling acoustical feedback and increasing the signal-to-noise ratio of the hearing aid ( Palmer, 2009). One of the advantages provided by digital circuitry is the capability of shaping the frequency response of the hearing aid. (Ont.), FCAOT, in Assistive Technologies (Fourth Edition), 2015 Hearing Aid Signal Processingĭigital hearing aids are based on low-power, small, digital signal processing circuits ( Palmer, 2009).
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