Listening system with an improved feedback cancellation system, a method and use

摘要

A listening device system includes two listening devices, each having its own separate housing. The first device includes an input transducer housed within the housing for converting an input sound to an electrical input signal which includes a direct and an acoustic feedback part, and a feedback cancellation system. The feedback cancellation system includes an adaptive FBC filter including a variable FBC filter part, and an FBC update algorithm part for updating the variable FBC filter part. The FBC update algorithm part receives first and second input signals influenced by the electrical input and the electrical output signals. The second listening device includes an input transducer housed within its housing producing an electrical update signal essentially consisting of the direct part of said electrical input signal. The update signal is conveyed from the second device to the first device, where feedback cancellation parameters are adjusted based on that signal.

主权项

1. A listening device system, comprising:
a first listening device, including
a first housing,a first input transducer housed within the first housing for converting an input sound to an electrical input signal, the electrical input signal including a direct part and an acoustic feedback part,an output transducer for converting an electrical output signal to an output sound, a forward path being defined between the input transducer and the output transducer,a signal processing unit, anda feedback cancellation system for estimating acoustic feedback, the feedback cancellation system including
an adaptive FBC filter arranged in parallel to the forward path, the adaptive FBC filter including
a variable FBC filter part, andan FBC update algorithm part for updating the variable FBC filter part, the FBC update algorithm part receiving first and second FBC algorithm input signals influenced by the electrical input and the electrical output signals, respectively, through a first and a second FBC update algorithm input signal path, respectively, the first and second FBC update algorithm input signal paths including a first variable filter and a second variable filter, respectively; and a second device, including
a second housing spatially located relative to the first housing, anda second input transducer housed within the second housing, the second input transducer producing an electrical update signal essentially consisting of said direct part of said electrical input signal, wherein filter coefficients based on the electrical update signal are transmitted from the first listening device to the second device.