Patent ID: 8687819
Filing Date: 2014-04-01
Classification: G10L,H04R

Abstract:
1. A method of estimating ambient noise in a listening system, the listening system comprising an input transducer for converting an input sound to an electrical input signal, including picking up an ambient noise, and an output transducer for converting an electrical output signal to an output sound, an electrical forward path being defined between the input transducer and the output transducer and an electrical feedback path comprising an adaptive filter for the adaptive filter comprising the variable filter part providing an estimate of the acoustic feedback path based on filter coefficients h′(i,nNT a) monitoring an energy κ b) applying a predefined threshold criterion to the change in energy content from one time instance to another to determine an acceptable impact of the ambient noise, wherein the energy κ where M is the order of the AFC filter h′(i,nNT