METHOD FOR SUPPRESSING FEEDBACK IN A HEARING INSTRUMENT AND HEARING INSTRUMENT

摘要

A method suppresses feedback in a hearing instrument. A microphone generates an input signal and a loudspeaker generates an acoustic signal which is partially fed back to the microphone via an acoustic feedback path. An intermediate signal is generated along a main signal path depending on the input signal, and an output signal is formed on the basis of the intermediate signal. A voice activity of a user is monitored, a transfer function of an electro-acoustic closed signal loop formed by the main signal path and the feedback path is estimated, that, depending on the transfer function of the closed signal loop and the voice activity of the user, the intermediate signal is decorrelated to form the output signal. A compensation signal is generated from the output signal and is fed to the input signal for feedback compensation, and the output signal is fed to the loudspeaker for reproduction.

主权项

1. A method for suppressing feedback in a hearing instrument, which comprises the steps of:
generating an input signal via a microphone of the hearing instrument; generating an acoustic signal at a loudspeaker of the hearing instrument, the acoustic signal being partially fed back to the microphone via an acoustic feedback path; generating an intermediate signal along a main signal path depending on the input signal; forming an output signal on a basis of the intermediate signal; monitoring voice activity of a user of the hearing instrument; estimating a transfer function of an electro-acoustic closed signal loop formed by the main signal path and the acoustic feedback path; depending on the transfer function of the electro-acoustic closed signal loop and the voice activity of the user of the hearing instrument, performing the following steps of:
decorrelating the intermediate signal to form the output signal;generating a compensation signal on a basis of the output signal and feeding the compensation signal to the input signal for feedback compensation; andfeeding the output signal to the loudspeaker for reproduction.