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Title:
SOUND GENERATING DEVICE
Document Type and Number:
Japanese Patent JP2004151180
Kind Code:
A
Abstract:

To make a separate excitation buzzer emit a plurality of timbres even when only a single PWM signal output port is used.

The sound generating device is provided with: a chime sound generating circuit 2 which performs ON/OFF control over supply of a current to a separate excitation buzzer 6 while gradually attenuating the PWM signal; a chime sound inhibiting circuit 3 which inhibits the current from being supplied to the separate excitation buzzer 6 by the chime sound generating circuit 2 by stopping the supply of the PWM signal; a buzzer sound generating circuit 4 which performs ON/OFF control over the supply of the current to the separate excitation buzzer 6 according to the PWM signal, and a buzzer sound inhibiting circuit 5 which inhibits the current from being supplied to the separate excitation buzzer 6 by the buzzer sound generating circuit 4 by stopping the supply of the PWM signal. A microcomputer 1 supplies the same PWM signal to the chime sound generating circuit 2 and buzzer sound generating circuit 4 to perform control for generating a buzzer sound by driving the chime sound inhibiting circuit 3 or control for generating a chime sound by driving the buzzer sound inhibiting circuit 5.


Inventors:
MIYAUCHI KAZUHISA
SAKOIN KAZUTAKA
Application Number:
JP2002313800A
Publication Date:
May 27, 2004
Filing Date:
October 29, 2002
Export Citation:
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Assignee:
JIDOSHA DENKI KOGYO KK
International Classes:
G10K9/12; G10K9/122; (IPC1-7): G10K9/122; G10K9/12
Attorney, Agent or Firm:
Tetsuo Yamaguchi



 
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