Title:
VEHICULAR ALARM APPARATUS
Document Type and Number:
Japanese Patent JP2015074283
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To provide a vehicular alarm apparatus with a sound pressure adjustment of an alarm sound with a desired tone secured.SOLUTION: In order to warn a vehicle condition requiring attention in a vehicle by an alarm sound and cause the alarm sound whose continuation period of turning on-off at a high set frequency being higher than a given boundary frequency to appear at a low set frequency being lower than the boundary frequency, a vehicular alarm apparatus 1 includes: a control unit 10 including a pulse generator 16 that generates a pulsing digital sound signal S0 that is turned on-off in an amplitude V0, and an MPU 12 that performs pulse-width modulation in accordance with an instruction of a computer program stored in memory 14; a low-pass filter 20 for attenuating a signal component of a high set frequency of the sound signal output from the control unit 10 and letting a signal component of a low set frequency of the sound signal to pass; and a piezoelectric buzzer 50 for issuing the alarm sound in the vehicle as a result of a voltage being applied, the voltage in accordance with an amplitude of the sound signal output from the low-pass filter 20.
Inventors:
TOMOTO SHUNSUKE
Application Number:
JP2013210331A
Publication Date:
April 20, 2015
Filing Date:
October 07, 2013
Export Citation:
Assignee:
DENSO CORP
International Classes:
B60Q5/00; G10K9/12; G10K9/122; G10K9/13
Domestic Patent References:
| JP2013116712A | 2013-06-13 | |||
| JPH0293595A | 1990-04-04 | |||
| JP2006060549A | 2006-03-02 | |||
| JP2012253568A | 2012-12-20 | |||
| JP2002014680A | 2002-01-18 | |||
| JPH0233197A | 1990-02-02 | |||
| JP2009101895A | 2009-05-14 | |||
| JP2013003309A | 2013-01-07 | |||
| JPS6345907A | 1988-02-26 | |||
| JP2011242698A | 2011-12-01 | |||
| JP2013116712A | 2013-06-13 | |||
| JPH0293595A | 1990-04-04 | |||
| JP2006060549A | 2006-03-02 | |||
| JP2012253568A | 2012-12-20 | |||
| JP2002014680A | 2002-01-18 | |||
| JPH0233197A | 1990-02-02 | |||
| JP2009101895A | 2009-05-14 |
Attorney, Agent or Firm:
Kazuyuki Yahagi
Taihei Nonobe
Takanori Kubo
Taihei Nonobe
Takanori Kubo