C_S_D 4340 Lecture Notes - Lecture 10: Visual Acuity, Distortion, Ear Canal
2 Jun 2016
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Output sound pressure level (ospl: the maximum sound pressure emitted from a hearing aid, need to limit so that hearing is not damaged, usually measured in a test box with an input signal of 90 db spl. Compression: varying the amount of gain based on how loud the input signal is, more gain for soft sounds, less gain for loud sounds, fit within dynamic range. Cosmetic concerns: degree of hearing loss, manual dexterity. Ear canal size and shape: need for specialized technology, attachments or accessories. The pocket, or body aid provides the most power and least electronic distortion of all hearing aids. The microphone and receiver are physically separate which reduces the chance of feedback. Body aids are often used with very young children because they are extremely duarable. 1: body worn aid has the advantage of separating the mic and the receiver.
