| 摘要 |
PROBLEM TO BE SOLVED: To suppress a child's viewing and listening to moving images and sound for many hours after midnight and to prevent viewing listening suppression from being canceled by the child with simple operation. SOLUTION: The sound reproduction device at least includes: a low frequency amplifier 8 for a sound signal to be listened to; an oscillator 13 for a mosquito sound to be superimposed on the sound signal amplified by the low frequency amplifier; and a timer 14 for controlling operation start of the oscillator. The sound reproduction device has an operation menu of mosquito sound setting for setting whether or not a signal of the mosquito sound is superimposed on the sound signal and has an operation menu of timer setting for turning on the timer when it is set that the signal is superimposed, when a listening duration has reached a prescribed period of time, or when a listening time has reached a prescribed time of a day. On a front step side of a volume adjustor 9 for adjusting a volume of the sound, the signal of the mosquito sound is superimposed on the sound signal. COPYRIGHT: (C)2009,JPO&INPIT
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