| 摘要 |
A hearing aid has a microphone (1), or other electromechanical transducer, for converting an acoustic input signal into an electrical signal, a signal- processing and amplifying signal path (2, 3, 13, 4, 5, 6) and an output converter (7) w hichconverts the amplified electrical signals back into acoustic signals, or in the case of an implanted hearing aid into mechanical signals, and a feedback digital fin ite impulse response filter (FIR filter) (9) for compensation of unwanted feedba ck (8) from the output converter to the microphone, in which the filter coefficient s of filter (9) are determined by feeding a short pulse into the feedback signal path (5 , 6, 7, 1, 2) and directly measuring the impulse response of this signal path.
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