EP 0195641 B1 19930630 - IMPROVEMENTS RELATING TO NOISE REDUCTION ARRANGEMENTS
Title (en)
IMPROVEMENTS RELATING TO NOISE REDUCTION ARRANGEMENTS
Publication
Application
Priority
GB 8506860 A 19850316
Abstract (en)
[origin: EP0195641A2] An active noise reduction (ANR) arrangement for reducing acoustic noise in an earphone structure (1) includes an automatic gain control arrangement (14-20) providing a variable loop gain dependent upon the variable noise reduction which is produced in the earphone (1) by the active noise reduction arrangement and which is effectively measured by noise pick-up microphones (5 and 13) located, respectively, in earphone structure front and rear internal cavities (11 and 12) positioned in front of and at the rear of a noise-cancelling transducer diaphragm (8,9) and providing a signal related to the measured noise reduction.
IPC 1-7
IPC 8 full level
G10K 11/00 (2006.01); G10K 11/16 (2006.01); G10K 11/178 (2006.01)
CPC (source: EP US)
G10K 11/17823 (2017.12 - EP US); G10K 11/17825 (2017.12 - EP US); G10K 11/17857 (2017.12 - EP US); G10K 11/17881 (2017.12 - EP US); G10K 2210/1081 (2013.01 - EP); G10K 2210/3013 (2013.01 - EP); G10K 2210/3028 (2013.01 - EP); G10K 2210/3045 (2013.01 - EP); G10K 2210/3056 (2013.01 - EP); G10K 2210/3213 (2013.01 - EP)
Designated contracting state (EPC)
AT BE CH DE FR IT LI LU NL SE
DOCDB simple family (publication)
EP 0195641 A2 19860924; EP 0195641 A3 19881005; EP 0195641 B1 19930630; AT E91189 T1 19930715; DE 3688624 D1 19930805; DE 3688624 T2 19931007; GB 8506860 D0 19850417
DOCDB simple family (application)
EP 86301946 A 19860317; AT 86301946 T 19860317; DE 3688624 T 19860317; GB 8506860 A 19850316