EP 0127247 A3 19860205 - TUNABLE RESPONSE TRANSDUCER
Title (en)
TUNABLE RESPONSE TRANSDUCER
Publication
Application
Priority
US 49706283 A 19830523
Abstract (en)
[origin: EP0127247A2] A tunable response transducer (20) includes a frame (22) providing an opening (24) covered by a diaphragm and a motor (50, 52, 54) coupled to the diaphragm to cause motion of the diaphragm in response to motor action. A cavity (66) defined behind the diaphragm is vented through a second opening (26) provided in the frame. Venting through the second opening is controlled by a valve mechanism (40, 42, 44, 46) which is adjustable to vary selectively the damping of the frequency response characteristic of the transducer in the region of its principal resonant frequency.
IPC 1-7
IPC 8 full level
G10K 9/13 (2006.01); H04R 1/22 (2006.01); H04R 9/06 (2006.01); H04R 11/00 (2006.01)
CPC (source: EP)
H04R 1/22 (2013.01); H04R 11/00 (2013.01)
Citation (search report)
- [X] DE 2547925 A1 19760520 - NAKAMURA KOMATSU
- [X] US 3999020 A 19761221 - BASTIAANS CEDRIC R, et al
- [Y] GB 2014017 A 19790815 - SEIKO INSTR & ELECTRONICS
- [A] FR 2201603 A1 19740426 - ERICSSON TELEFON AB L M [SE]
- [A] US 1646628 A 19271025
- [A] GB 670868 A 19520423 - MACHIEL DE VRIES
- [A] DE 1437376 A1 19681024 - AKG AKUSTISCHE KINO GERAETE
- [A] DE 1076182 B 19600225 - F & H SCHUMANN G M B H
Designated contracting state (EPC)
DE GB
DOCDB simple family (publication)
EP 0127247 A2 19841205; EP 0127247 A3 19860205; JP S59216397 A 19841206
DOCDB simple family (application)
EP 84300273 A 19840117; JP 22669183 A 19831130