EP 0467499 A3 19920527 - AUDIO APPARATUS WITH ANTI-HOWL FUNCTION
Title (en)
AUDIO APPARATUS WITH ANTI-HOWL FUNCTION
Publication
Application
Priority
JP 18767690 A 19900716
Abstract (en)
[origin: EP0467499A2] An audio apparatus is arranged to eliminate howls. The apparatus is provided with at least one notch filter (9) arranged across a transmission line of audio signals from a microphone (1), wherein the band-rejection center frequency of the notch filter (9) varies with time, so that generation of howls is prevented without deteriorating the sound quality. <IMAGE>
IPC 1-7
IPC 8 full level
H03H 17/00 (2006.01); H03H 17/04 (2006.01); H04R 3/02 (2006.01)
CPC (source: EP)
H04R 3/02 (2013.01)
Citation (search report)
- [X] US 4232192 A 19801104 - BEEX ALOYSIUS A
- [A] US 4091236 A 19780523 - CHEN CHUN-FU
- [A] EP 0197758 A2 19861015 - MATSUSHITA ELECTRIC IND CO LTD [JP]
- [X] JOURNAL OF THE AUDIO ENGINEERING SOCIETY. vol. 32, no. 3, March 1984, NEW YORK US pages 144 - 150; J.RODDNEY COX: 'Squealer Killer with Real-Time Equalization'
- [X] PATENT ABSTRACTS OF JAPAN vol. 12, no. 221 (E-625)23 June 1988 & JP-A-63 015 598 ( MATSUSHITA ELECTRIC IND CO LTD )
- [A] PATENT ABSTRACTS OF JAPAN vol. 12, no. 200 (E-619)9 June 1988 & JP-A-63 001 295 ( MATSUSHITA ELECTRIC IND CO LTD )
Designated contracting state (EPC)
DE FR GB
DOCDB simple family (publication)
EP 0467499 A2 19920122; EP 0467499 A3 19920527; JP H0477093 A 19920311
DOCDB simple family (application)
EP 91301941 A 19910308; JP 18767690 A 19900716