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Acoustic feedback is one of the challenges in hearing instrument design where the amount of acoustic gain of the hearing instrument is limited before the onset of acoustic feedback. When acoustic feedback occurs, the hearing instrument is effectively inoperable. Adaptive feedback cancellation algorithms embodied in digital hearing instruments is the method often adopted by manufacturers to address the acoustic feedback problem. In this research program, an analogue behind-the-ear (BTE) hearing instrument is constructed and the known two-port modeling technique is applied to obtain the model of each component, and thereafter the open loop transfer function (OLTF). By means of the Nyquist Stability Criterion, the collective contribution and effect of each component to the acoustic feedback problem can be determined. The derived model of the hearing instrument is verified experimentally. The two-port model is found to be cumbersome, and to be largely inappropriate for the modeling of digital instruments because it is unable to accommodate non-linear algorithms. Two digital hearing instruments are constructed and their models are obtained by means of the system identification method. One model involves only the feedback path, appropriate for simulations involving non-continuous feedback cancellation algorithms. The other model is the entire hearing instrument, appropriate for simulations involving continuous feedback cancellation algorithms. For the simplicity of modeling, we propose ii ATTENTION: The Singapore Copyright Act applies to the use of this document. Nanyang Technological University Library

Modeling of and acoustic feedback cancellation in hearing instruments