| 摘要 |
A hearing device, e.g. a hearing aid, is provided, comprising a forward path comprising an input transducer for providing an electric input signal, a signal processing unit configured to apply a requested forward gain to the electric input signal, and an output transducer. The hearing device further comprises a feedback reduction unit for reducing a risk of howl due to feedback from the output transducer to the input transducer. The forward path and the external feedback path defines a roundtrip loop delay. The feedback reduction unit is configured to modulate said requested forward gain in time, to provide that the resulting forward gain exhibits a first, increased gain AH in a first time period TH and a second, reduced gain AL in a second time period TL, wherein at least one of AH, AL, TH, and TL is/are determined according to a predetermined or adaptively determined criterion including said roundtrip loop delay. |
| 主权项 |
1. A hearing device, e.g. a hearing aid, comprising an input transducer for converting an input sound to an electric input signal representing sound, an output transducer for converting a processed electric output signal to an output sound or mechanical vibration, and a signal processing unit operationally coupled to the input and output transducers and configured to apply a requested forward gain to the electric input signal or a signal originating therefrom, the input transducer, the signal processing unit and the output transducer forming part of a forward path of the hearing device, the forward path applying a resulting forward gain to the electric input signal and providing a resulting signal, the hearing device further comprising a feedback reduction unit for reducing a risk of howl due to acoustic or mechanical feedback of an external feedback path from the output transducer to the input transducer, the forward path and the external feedback path defining a loop path exhibiting a roundtrip loop delay, wherein the feedback reduction unit is configured to modulate said requested forward gain in time, to provide that the resulting forward gain exhibits a first, increased gain AH in a first time period TH and a second, reduced gain AL in a second time period TL, wherein at least one of the first gain AH, the second gain AL, the first time period TH, and the second time period TL is/are determined according to a predetermined or adaptively determined criterion, and wherein said criterion comprises that said first TH and/or said second TL time period is determined in dependence of said, possibly averaged, roundtrip loop delay of the forward path and the external feedback path. |
