(19)
(11) EP 1 793 645 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
06.08.2008 Bulletin 2008/32

(43) Date of publication A2:
06.06.2007 Bulletin 2007/23

(21) Application number: 06251486.4

(22) Date of filing: 21.03.2006
(51) International Patent Classification (IPC): 
H04R 3/02(2006.01)
(84) Designated Contracting States:
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC NL PL PT RO SE SI SK TR
Designated Extension States:
AL BA HR MK YU

(30) Priority: 09.11.2005 HK 5109977

(71) Applicant: GPE International Limited
Kwai Chung, New Territories, Hong Kong SAR (CN)

(72) Inventors:
  • Shi, Yong, c/o Room 203, 14th Bld.
    518021 Luohu District, Shenzen (CN)
  • Sun, Jing, c/o Room 27N, Biluo Xuan
    Futian District, Shenzhen (CN)

(74) Representative: Marles, Alan David 
Stevens, Hewlett & Perkins 1 St Augustine's Place
Bristol BS1 4UD
Bristol BS1 4UD (GB)

   


(54) Acoustical feedback suppression for audio amplification systems


(57) A method of acoustic feedback suppression, comprising the steps of:-
i). obtaining digitized time-domain samples of acoustic signals,
ii). performing discrete time-frequency transformation on the digitized time-domain samples to generate a plurality of frequency bins of a frequency resolution,
iii). identifying a howling frequency bin, said howling frequency having the maximum magnitude among the plurality of frequency bins,
iv). detecting a peak frequency within said howling frequency bin for suppression, and
v). suppressing said peak frequency.







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