By the present invention, a buzzer is sounded without contamination with abnormal noise. A non-audible-frequency signal generation unit (22) generates a non-audible-frequency pulse signal (P0) having a non-audible frequency, an audible-frequency signal generation unit (26) generates an audible-frequency pulse signal (P1) having an audible frequency from the non-audible-frequency pulse signal (P0), a signal synthesis unit (28) generates a synthesized-frequency pulse signal (P2) in which the non-audible-frequency pulse signal (P0) is synthesized during the ON time of the audible-frequency pulse signal (P1), a first duty ratio setting unit (30) sets the duty ratio (Di) of the non-audible-frequency pulse signal (P0) synthesized in the synthesized-frequency pulse signal (P2); so as to gradually increase over the course of an initial predetermined period of the synthesized-frequency pulse signal (P2) and generates a buzzer driving signal (P3), and a buzzer driving unit (40) sounds a buzzer (60) at a volume corresponding to the duty ratio of the buzzer driving signal (P3) and the pitch of a sound corresponding to the frequency of the buzzer driving signal (P3).
Buzzer output control device and buzzer output control method
2015-08-26
Patent
Electronic Resource
English
IPC: | B60Q ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL , Anordnung von Signal- oder Beleuchtungsvorrichtungen, deren Einbau oder Halterung oder deren Schaltkreise bei Fahrzeugen allgemein |