Global Patent Index - EP 0980572 A1

EP 0980572 A1 2000-02-23 - METHOD FOR SELECTIVELY CONTROLLING SOUND RADIATION

Title (en)

METHOD FOR SELECTIVELY CONTROLLING SOUND RADIATION

Title (de)

VERFAHREN ZUR SELEKTIV KONTROLLIERTEN SCHALLABSTRAHLUNG

Title (fr)

PROCEDE POUR L'OBTENTION D'UN RAYONNEMENT ACOUSTIQUE CONTROLE SELECTIVEMENT

Publication

EP 0980572 A1 (DE)

Application

EP 98912181 A

Priority

  • CH 9800135 W
  • CH 107097 A

Abstract (en)

[origin: WO9850905A1] The invention relates to a method for selectively controlling the sound field (3) radiated from an active sound source (1) by means of several lambda /4 resonators (2), i.e. to prevent sound radiation of a predetermined frequency f>0<. To this end, several lambda /4 resonators (2) are so fitted to the active sound source (1)that their openings (6) are adjacent to the surface (9) of the sound source (1). The air pressure fluctuations and air currents produced by the active sound source (1) on its surface (9) interact with the openings (6) of the lambda /4 resonators (2). Predetermined frequencies f>0< are eliminated from the radiated sound field by appropriate selection of the lambda /4 resonators.

IPC 1-7 (main, further and additional classification)

G10K 11/172

IPC 8 full level (invention and additional information)

B60R 13/08 (2006.01); G10K 11/16 (2006.01); G10K 11/172 (2006.01)

CPC (invention and additional information)

G10K 11/172 (2013.01)

Citation (search report)

See references of WO 9850905A1

Designated contracting state (EPC)

CH DE FR GB IT LI

EPO simple patent family

WO 9850905 A1 19981112; AR 015641 A1 20010516; EP 0980572 A1 20000223; JP 2001507478 A 20010605

INPADOC legal status


2002-02-27 [18D] DEEMED TO BE WITHDRAWN

- Effective date: 20010817

2001-05-23 [17Q] FIRST EXAMINATION REPORT

- Effective date: 20010406

2000-02-23 [17P] REQUEST FOR EXAMINATION FILED

- Effective date: 19990923

2000-02-23 [AK] DESIGNATED CONTRACTING STATES:

- Kind Code of Ref Document: A1

- Designated State(s): CH DE FR GB IT LI