Global Patent Index - EP 0998168 A1

EP 0998168 A1 2000-05-03 - Compensation system for planar loudspeakers

Title (en)

Compensation system for planar loudspeakers

Title (de)

Kompensationssystem für planar Lautsprecher

Title (fr)

Système de compensation pour écouteurs planars

Publication

EP 0998168 A1 (EN)

Application

EP 99304682 A

Priority

US 9904998 A

Abstract (en)

A frequency response compensation system incorporating conventional and unconventional cascaded equalization circuits, in which the frequency response aberrations of a planar diaphragm loudspeaker mounted in an architectural ceiling, wall, or in other enclosure having a limited depth dimension are optimally corrected. A multi-section switch is comprised in a resonant circuit to enable single-control selection of pre-set amplitude (A), frequency (F) and bandwidth (Q) parameters corresponding to various enclosure depths. A low-frequency underdamped high-pass filter and a low-frequency response shaping circuit may each be included in the system to compensate for a low-frequency roll-off resulting from the limited depth dimension of the enclosure. A high-frequency equalization circuit, in which high-pass filtered and non-filtered signals are summed, introduces a rapid rate-of-change shelved equalization required to compensate for a rapid high-frequency response roll-off resulting from the application of decorative finishing materials to the planar loudspeaker diaphragm. A stereophonic spatialization circuit may also be included and utilizes modified stereophonic signal cross-coupling to compensate for the reduced levels of room reverberant sound information associated with in-wall planar loudspeakers. <IMAGE>

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

H04R 3/04

IPC 8 full level (invention and additional information)

H04R 3/04 (2006.01)

CPC (invention and additional information)

H04R 3/04 (2013.01)

Citation (search report)

Designated contracting state (EPC)

DE FR GB IT NL SE

EPO simple patent family

EP 0998168 A1 20000503

INPADOC legal status


2001-08-29 [18D] DEEMED TO BE WITHDRAWN

- Effective date: 20001104

2001-01-10 [AKX] PAYMENT OF DESIGNATION FEES

- Free text: DE FR GB IT NL SE

2000-05-03 [AK] DESIGNATED CONTRACTING STATES:

- Kind Code of Ref Document: A1

- Designated State(s): DE FR GB IT NL SE

2000-05-03 [AX] REQUEST FOR EXTENSION OF THE EUROPEAN PATENT TO

- Free text: AL;LT;LV;MK;RO;SI