| 摘要 |
A buzzer damping sound producing device in which a fundamental frequency pulse signal is applied to a buzzer to produce a damping sound with a predetermined period. The device includes a variable duty pulse generator which produces a fundamental frequency pulse signal repeatedly, the duty ratio of which is gradually decreased per predetermined period. The fundamental frequency pulse signal thus produced is applied to the buzzer to operate the buzzer, whereby buzzer damping sounds different in period and frequency can be produced readily.
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