| 摘要 |
The application relates to a method of determining a system parameter, e.g. step size, in an adaptive algorithm, e.g. an adaptive feedback cancellation algorithm and to an audio processing system. An object of the present application is to provide an alternative scheme for feedback estimation in a multi-microphone audio processing system. The problem is solved in that a feedback part of the open loop transfer function (OLTF) of the system is estimated and separated in a transient part and a steady state part, which can be used to control the adaptation rate of the adaptive feedback cancellation algorithm by adjusting the system parameter, e.g. step size parameter, of the algorithm when desired system properties, such as a steady state value or a convergence rate of the feedback part of the OLTF, are given/desired. The method can be used for different adaptation algorithms such as LMS, NLMS, RLS, etc. The invention may e.g. be used in hearing aids, headsets, handsfree telephone systems, teleconferencing systems, public address systems, etc.
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