Adaptive feedback cancellation based on inserted and/or intrinsic signal characteristics and matched retrieval

(19)

(11)

EP 2 621 198 A3

(12)	EUROPEAN PATENT APPLICATION

(88)	Date of publication A3:
	25.03.2015 Bulletin 2015/13

(43)	Date of publication A2:
	31.07.2013 Bulletin 2013/31

(21)	Application number: 13164634.1

(22)	Date of filing: 26.03.2010

(27)	Previously filed application: 26.03.2010 EP 10157933

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International Patent Classification (IPC):

H04R 25/00^(2006.01)

H04R 3/02^(2006.01)

(84)	Designated Contracting States:
	AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO SE SI SK SM TR

(30)

Priority:

02.04.2009 WO PCT/EP2009/053920
25.09.2009 US 245679 P

(62)	Application number of the earlier application in accordance with Art. 76 EPC:
	10157933.2 / 2237573

(71)	Applicant: Oticon A/S
	2765 Smørum (DK)

(72)	Inventors:
	Jensen, Jesper DK-2765 Smørum (DK) Elmedyb, Thomas Bo DK-2765 Smørum (DK)

(74)	Representative: Nielsen, Hans Jørgen Vind
	Oticon A/S IP Management Kongebakken 9 2765 Smørum 2765 Smørum (DK)

(54)	Adaptive feedback cancellation based on inserted and/or intrinsic signal characteristics and matched retrieval

(57) The object of the present invention is to provide an alternative scheme for minimizing feedback in audio processing systems. The audio processing system comprises an enhancement unit for estimating noise-like signal components in the electric signal of a forward path and providing a noise signal estimate output, based on filtering by an adaptive noise retrieval filter E of a signal y_c from another microphone (e.g. of a contra-lateral listening device), and wherein a feedback path estimation unit is adapted to use the noise signal estimate output in the estimation of an acoustic feedback transfer function.

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