Patent ID: 9269343
Filing Date: 2016-02-23
CPC Classification: G10K,H04R

Claim Text:
1. An audio processing device comprising at least one input transducer for picking up a sound signal and converting it to at least one electric input signal and at least one output transducer for converting an electric output signal to an output sound, a forward path being defined between the at least one input transducer and the at least one output transducer, the forward path comprising a signal processing unit for processing the at least one electric input signal or a signal derived therefrom and providing a processed output signal and a de-correlation unit for de-correlating the electric output signal and the electric input signal; the audio processing device further comprising an analysis path in parallel to all or a part of the forward path, the analysis path comprising a feedback estimation system for estimating feedback from the at least one output transducer to the at least one input transducer and providing a corresponding feedback estimation signal, the feedback estimation system comprising an adaptive filter comprising a variable filter part for filtering an input signal according to variable filter coefficients and an algorithm part, the algorithm part comprising an adaptive algorithm for dynamically updating said filter coefficients, a control unit for controlling said de-correlation unit and said adaptive algorithm, and a correlation detection unit for determining a) the auto-correlation of a signal of the forward path and providing an AC-value and/or b) the cross-correlation between two different signals of the forward path and providing an XC-value, wherein the control unit is configured to base or influence its control of said de-correlation unit and said adaptive algorithm on said AC-value and/or said XC-value.