EP 0195641 A2 19860924 - Improvements relating to noise reduction arrangements.
Title (en)
Improvements relating to noise reduction arrangements.
Title (de)
Anordnungen zur Begrenzung von Störungen.
Title (fr)
Dispositifs de réduction de bruit.
Publication
Application
Priority
GB 8506860 A 19850316
Abstract (en)
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