EP 1903833 A1 20080326 - Feedback cancellation in a sound system
Title (en)
Feedback cancellation in a sound system
Title (de)
Rückkopplungsunterdrückung in einem Tonsystem
Title (fr)
Suppression de rétroaction dans un système sonore
Publication
Application
Priority
EP 06121006 A 20060921
Abstract (en)
This invention relates to a sound system and method for processing acoustical sound. The sound system comprises a microphone for converting an acoustical sound to an electrical sound signal, a processor for processing the sound signal and for generating a processed sound signal, and a speaker for converting the processed sound signal to a processed acoustical sound. The processor comprises a calculating unit for calculating a threshold value based on mean magnitude and standard deviation of the sound signal, a FFT unit for transforming the sound signal into frequency domain, a peak identification unit for identifying a peak in the sound signal in frequency domain and for generating a peak signal, a comparator for comparing the threshold value with the peak signal and for generating a control signal identifying frequency of said peak, and a programmable notch-filter unit receiving said control signal and filtering out a bandwidth of the sound signal in accordance with the control signal thereby generating the processed sound signal.
IPC 8 full level
H04R 3/02 (2006.01)
CPC (source: EP)
H04R 3/02 (2013.01); H04R 27/00 (2013.01); H04R 29/001 (2013.01)
Citation (search report)
- [XY] EP 0599450 A2 19940601 - MATSUSHITA ELECTRIC IND CO LTD [JP]
- [Y] EP 0843502 A1 19980520 - YAMAHA CORP [JP]
- [A] US 5677987 A 19971014 - SEKI NOBUYUKI [JP], et al
- [A] US 2003144840 A1 20030731 - MA CHANGXUE [US], et al
Designated contracting state (EPC)
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 state (EPC)
AL BA HR MK YU
DOCDB simple family (publication)
DOCDB simple family (application)
EP 06121006 A 20060921