Onset of feedback howl in hearing aids

Michael R. Stinson, Gilles A. Daigle

Abstract


The role of acoustical feedback howl in hearing aids is discussed. The Nyquist criterion asserted that the onset of feedback howl occurs when the overall feedback gain is unity. It is observed that the size of the feedback signal depends on the amplification settings of the hearing aid. It is stated that upon meeting the conditions for feedback howl, the howl will be evident at the ear canal microphone.

Keywords


Acoustic noise; Amplification; Electric potential; Feedback; Frequencies; Microphones; Oscillations; Signal processing; Telephone sets; Transfer functions; Acoustic feedback howl; Electrical signals; Feedback paths; Open-loop transfer functions

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