EP 1499157 A1 20050119 - Speaker driving circuit and mobile terminal
Title (en)
Speaker driving circuit and mobile terminal
Title (de)
Ansteuerschaltung für einen Lautsprecher und mobiles Endgerät
Title (fr)
Circuit de commande pour haut parleur et terminal mobile
Publication
Application
Priority
EP 03016331 A 20030718
Abstract (en)
A speaker driving circuit (10) for processing an audio signal (SOUT) to be outputted by a loudspeaker (101) having a resonance frequency comprises means (107) for receiving a signal from a signal source (121, 123); a band-pass filter (109) and a high-pass filter (111) for filtering the signal received to a first and a second filtered signal, whereby the band-pass filter (109) has a lower cut-off frequency at or lower than the resonance frequency of the loudspeaker, and the high-pass filter (111) has a cut-off frequency higher than the resonance frequency of the loudspeaker; and means (105) for selecting the first or the second filtered signal for amplifying the filtered signal or for selecting the band-pass filter (109) or the high-pass filter (111). <IMAGE>
IPC 1-7
IPC 8 full level
H04R 3/04 (2006.01)
CPC (source: EP)
H04R 3/04 (2013.01)
Citation (search report)
- [XA] EP 0888032 A1 19981230 - MATSUSHITA ELECTRIC IND CO LTD [JP]
- [XA] US 5524061 A 19960604 - MOONEY CHARLES W [US], et al
- [A] US 3277374 A 19661004 - IORI KOBAYASHI
- [A] DE 4227601 C1 19970710 - SIEMENS AG [DE]
- [DA] DE 19548149 A1 19970626 - OPEL ADAM AG [DE]
- [DA] EP 1135002 A2 20010919 - SONY CORP [JP]
Designated contracting state (EPC)
DE FR GB IT
DOCDB simple family (publication)
DOCDB simple family (application)
EP 03016331 A 20030718