EP 0998168 A1 20000503 - 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
Application
Priority
US 9904998 A 19980617
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
IPC 8 full level
H04R 3/04 (2006.01)
CPC (source: EP)
H04R 3/04 (2013.01)
Citation (search report)
- [A] GB 2268026 A 19931222 - ALPINE ELECTRONICS INC [JP], et al
- [A] US 5468922 A 19951121 - HANBA MICHIO [JP]
- [A] EP 0344974 A2 19891206 - ELIELI BOAZ
Designated contracting state (EPC)
DE FR GB IT NL SE
DOCDB simple family (publication)
DOCDB simple family (application)
EP 99304682 A 19990616