Abstract: A method (300) of fitting a hearing aid system, based on the use of hearing aid system setting data and data related to a possible hearing aid system performance verification for a multitude of different hearing aid system users, as well as a hearing aid system adapted to carry out such a method.

Abstract: A method (400) of testing microphone performance of a hearing aid system, based on a determined correlation measure between a first and a second microphone signal, as well as a hearing aid system adapted to carry out such a method.

Abstract: A method (500) of testing microphone performance of a hearing aid system, based on a determined correspondence between a hearing aid microphone signal and a test signal provided by the hearing aid system, as well as a hearing aid system adapted to carry out such a method.

Abstract: A hearing aid system (100), wherein changes to the settings is only allowed if a hearing aid performance verification is carried out with a successful result as well as a method of operating such a hearing aid system.

Abstract: A method (300) of fitting a hearing aid system, based on the use of hearing aid system setting data and data related to a possible hearing aid system performance verification for a multitude of different hearing aid system users, as well as a hearing aid system adapted to carry out such a method.

Abstract: A method (400) of testing microphone performance of a hearing aid system, based on a determined correlation measure between a first and a second microphone signal, as well as a hearing aid system adapted to carry out such a method.

Abstract: A method (500) of testing microphone performance of a hearing aid system, based on a determined correspondence between a hearing aid microphone signal and a test signal provided by the hearing aid system, as well as a hearing aid system adapted to carry out such a method.

Abstract: There is presented a hearing aid that comprises an input transducer for transforming an acoustic input signal into an electrical input signal, a compressor for generating an electrical output signal from the electrical input signal, an output transducer for transforming the electrical output signal into an acoustic output signal, an autocorrelation estimator for calculating an autocorrelation estimate of the electrical input signal, and an acoustic loop gain estimator for determining a dynamic gain limit from the autocorrelation estimate and an instantaneous gain level of the signal processor. The invention further provides a method of adjusting signal path gain in a hearing aid, and a system for providing increased stability in a hearing aid.

Abstract: There is presented a hearing aid that comprises an input transducer for transforming an acoustic input signal into an electrical input signal, a compressor for generating an electrical output signal from the electrical input signal, an output transducer for transforming the electrical output signal into an acoustic output signal, an autocorrelation estimator for calculating an autocorrelation estimate of the electrical input signal, and an acoustic loop gain estimator for determining a dynamic gain limit from the autocorrelation estimate and an instantaneous gain level of the signal processor. The invention further provides a method of adjusting signal path gain in a hearing aid, and a system for providing increased stability in a hearing aid.