(19)
(11) EP 1 133 211 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
04.12.2002 Bulletin 2002/49

(43) Date of publication A2:
12.09.2001 Bulletin 2001/37

(21) Application number: 01301842.9

(22) Date of filing: 28.02.2001
(51) International Patent Classification (IPC)7: H04R 5/04
(84) Designated Contracting States:
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR
Designated Extension States:
AL LT LV MK RO SI

(30) Priority: 06.03.2000 JP 2000060209

(71) Applicant: Pioneer Corporation
Meguro-ku, Tokyo (JP)

(72) Inventor:
  • Takahashi, Keiichi, c/o Pioneer Corporation
    Oaza Yamada, Kawagoe-shi, Saitama (JP)

(74) Representative: Haley, Stephen 
Gill Jennings & Every, Broadgate House, 7 Eldon Street
London EC2M 7LH
London EC2M 7LH (GB)

   


(54) Information apparatus having speakers


(57) In an information apparatus having speakers, an inspection signal of the frequency out of the audible frequency band outputted from the microcomputer 23 is inputted into the input terminal 14a of power IC 10a via the input switch circuit 22, a signal to be inspected, which is outputted to the ripple terminal 13a of power IC 10a according to the inspection signal, is extracted by the extracting circuit 20a, and it is judged by an intensity of the output signal outputted from the extracting circuit 20a whether or not speaker FLS is connected to the amplifier 12a.






Search report