| 摘要 |
PURPOSE:To inform the timing of start of a song to a singer by operating a timer by a detecting tape sticked before the start of song to generate light emission and signal sound. CONSTITUTION:The detecting tape 2 made of a metallic foil or the like is sticked to a part of the start of a song on a recorded orchestral accompanyment tape 1. Then, a detected electrode 3 is short-circuited by the part of the detecting tape 2 to operate a circuit of the timer 4. While the timer 4 is operated, a light emitting diode 6 is lighted, an oscillator 7 is operated and a signal sound is generated from an earphone 8. a variable resistor 5 is used for adjusting the operating time of the timer 4. This light emitting diode 6 is fitted to a microphone 9 or a position seen easily by a singer, and this sign and the start of song signal sound from the earphone 8 prevent a trouble. |
