EP 0643880 A4 19960221 - ACTIVE/PASSIVE HEADSET WITH SPEECH FILTER.
Title (en)
ACTIVE/PASSIVE HEADSET WITH SPEECH FILTER.
Title (de)
AKTIVER/PASSIVER KOPFHÖRER MIT SPRACHFILTER.
Title (fr)
CASQUE D'ECOUTE ACTIF/PASSIF A FILTRE VOCAL.
Publication
Application
Priority
- CA 2136951 A 19920605
- US 9204568 W 19920605
Abstract (en)
[origin: CA2136951A1] 2136951 9326085 PCTABS00028 An active/passive headset with a speech filter characterized by a controller (20) processing speech, noise and warning signals input from microphones (14) on closed back muffs (20) and providing an anti-noise output by a digital virtual earth or adaptive feedforward algorithm to speakers (12) adjacent a user's ear.
IPC 1-7
IPC 8 full level
A61F 11/14 (2006.01); G10K 11/178 (2006.01)
CPC (source: EP US)
A61F 11/145 (2022.01 - EP); G10K 11/17837 (2017.12 - EP US); G10K 11/17854 (2017.12 - EP US); G10K 11/17861 (2017.12 - EP US); G10K 11/17881 (2017.12 - EP US); G10K 2210/108 (2013.01 - EP); G10K 2210/1081 (2013.01 - EP); G10K 2210/3028 (2013.01 - EP); G10K 2210/3045 (2013.01 - EP); G10K 2210/3222 (2013.01 - EP); G10K 2210/509 (2013.01 - EP)
Citation (search report)
- [X] DE 3025391 A1 19820128 - BATTELLE INSTITUT E V [DE]
- [X] FR 2604551 A1 19880401 - SAINT LOUIS INST [FR]
- [X] V. BARTELS: "Headset with Active Noise-Reduction System for Mobile Applications.", AES JOURNAL OF THE AUDIO ENGINEERING SOCIETY, vol. 40, no. 4, NEW YORK, USA, pages 277 - 281, XP000278536
- See references of WO 9326085A1
Designated contracting state (EPC)
AT BE CH DE DK ES FR GB GR IT LI LU MC NL SE
DOCDB simple family (publication)
CA 2136951 A1 19931223; EP 0643880 A1 19950322; EP 0643880 A4 19960221
DOCDB simple family (application)
CA 2136951 A 19920605; EP 92912841 A 19920605