| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for producing sounds for turn sounds for an automobile and a sounder for turn sounds for an automobile, such that not only is cost minimized but a turn sound close to the operational sound of a mechanical relay can be output from a speaker. SOLUTION: A turn sound pulse signal with a continuously changing frequency and duty cycle is output from a PPG port 21 of a CPU 2. An integrator circuit 31 integrates the turn sound pulse signal, converting that signal to a turn sound analog signal. A speaker 5 outputs the turn sound analog signal that had been converted by the integrator circuit 31. Also, alarm sound pulse signals of a constant frequency and constant duty cycle are output from S/G ports 22 to 23 of a CPU 2. Integrator circuits 32 to 34 integrate the alarm sound pulse signals, converting these signals to alarm sound analog signals. When an adder circuit 4 adds the turn sound analog signal to the alarm sound pulse signals and outputs the result to the speaker, the speaker outputs a turn sound and alarm sound at the same time. COPYRIGHT: (C)2011,JPO&INPIT
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