EP 2237573 A1 20101006 - Adaptive feedback cancellation method and apparatus therefor
Title (en)
Adaptive feedback cancellation method and apparatus therefor
Title (de)
Verfahren zur adaptiven Rückkopplungsunterdrückung und Vorrichtung dafür
Title (fr)
Procédé de suppression adaptative de couplage acoustique et dispositif correspondant
Publication
Application
Priority
- US 24567909 P 20090925
- EP 2009053920 W 20090402
- EP 10157933 A 20100326
Abstract (en)
The invention relates to an audio processing system for processing an input sound to an output sound. The invention further relates to a method of estimating a feedback transfer function in an audio processing system. The object of the present invention is to provide an alternative scheme for minimizing feedback in audio processing systems. The problem is solved in that the audio processing system comprises 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 adapted for processing 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 a enhancement unit for estimating noise-like signal components in the electric signal of the forward path and providing a noise signal estimate output, wherein the feedback path estimation unit is adapted to use the noise signal estimate output in the estimation of the acoustic feedback transfer function. This has the advantage of providing an adaptive feedback cancellation system which is robust in situations with a high degree of correlation between the output signal and the input signal of an audio processing system, e.g. a listening device. The invention may e.g. be used in public address systems, entertainment systems, hearing aids, head sets, mobile phones, wearable/portable communication devices, etc.
IPC 8 full level
H04R 25/00 (2006.01); H04R 3/02 (2006.01)
CPC (source: EP US)
G10K 11/17819 (2017.12 - EP US); G10K 11/17854 (2017.12 - EP US); G10K 11/17855 (2017.12 - EP US); G10K 11/17879 (2017.12 - EP US); G10K 11/17881 (2017.12 - EP US); G10K 11/17885 (2017.12 - EP US); H04R 3/02 (2013.01 - EP US); H04R 25/453 (2013.01 - EP); G10K 2210/108 (2013.01 - EP); G10K 2210/1081 (2013.01 - EP); G10K 2210/3055 (2013.01 - EP); H04R 25/552 (2013.01 - EP); H04R 25/554 (2013.01 - EP); H04R 2460/01 (2013.01 - EP)
Citation (applicant)
- EP 0415677 A2 19910306 - GN DANAVOX AS [DK]
- US 2007172080 A1 20070726 - JANSE CORNELIS P [NL], et al
- WO 2007125132 A2 20071108 - PHONAK AG [CH], et al
- EP 0579152 A1 19940119 - MINNESOTA MINING & MFG [US]
Citation (search report)
- [XAYI] EP 0579152 A1 19940119 - MINNESOTA MINING & MFG [US]
- [X] WO 0110170 A2 20010208 - AUDIOLOGIC HEARING SYS LP [US]
- [Y] US 6418227 B1 20020709 - KUO SEN M [US]
Designated contracting state (EPC)
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
DOCDB simple family (publication)
EP 2237573 A1 20101006; EP 2237573 B1 20210310; EP 2621198 A2 20130731; EP 2621198 A3 20150325
DOCDB simple family (application)
EP 10157933 A 20100326; EP 13164634 A 20100326