Patent ID: 8442251
Filing Date: 2013-05-14
Classification: H04R

Abstract:
1. An audio processing system for processing an input sound to an output sound, the audio processing system comprising: an input transducer for converting an input sound to an electric input signal and defining an input side; an output transducer for converting a processed electric output signal to an output sound and defining an output side; a forward path being defined between the input transducer and the output transducer, and comprising a signal processing unit (SPU) configured to process an SPU-input signal originating from the electric input signal and to provide a processed SPU-output signal; and an electric feedback loop from the output side to the input side comprising: a feedback path estimation unit for estimating an acoustic feedback transfer function from the output transducer to the input transducer, and an enhancement unit for extracting characteristics of an electric signal of the forward path, the characteristics of the electric signal including at least one of modulation index, periodicity, correlation time, and noise-like parts of the electric signal, and providing an estimated characteristics output, wherein the feedback path estimation unit is adapted to use the estimated characteristics output in the estimation of the acoustic feedback transfer function.