C_S_D 4340 Lecture Notes - Lecture 9: Frequency Response, Sound Energy, Hearing Aid
2 Jun 2016
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Topic outline: basic components, electro-acoustic properties, types of hearing aids. Controls and features: on/off switch, allows user to turn it off when not in use. Volume control: usually a rotating wheel that lets the user choose a preferred volume. Some programmable hearing aids don"t have one, sometimes they are push buttons or a control that is set with a screwdriver by the audiologist. Telecoil (t-coil: a special circuit for using the hearing aid with a telephone. Instead of picking up sound waves, it picks up electromagnetic signals from the receiver of the telephone. There may be a switch or button to access the t-coil. Tone and output controls: things the audiologist can adjust to change the settings of the hearing aid to add in or reduce low frequencies or high frequencies or to limit the overall output of the hearing aid. Frequency response: output spl, distortion and internal noise.
