| 摘要 |
PURPOSE:To make the sounding of a melody pleasant by providing a means adjusting from outside the speed, tone quality and volume of sounding in a sounding clock which stores melody data inputted from a keyboard and regenerates the same as acoustic sounds. CONSTITUTION:The data of melody from the keyboard 1 are stored in RAM 4 under the control of a central control device 3, while at the time of regeneration the data read out divide frequencies of a sound source oscillator 7 according to the data of a musical interval, through the intermediary of a decoder 6 and a variable frequency divider 8 and drive a speaker 23. At this time, the speed is adjusted by the resistance 28 of a tempo oscillator 13 formed of a nonstable multivibrator, as a variable resistance, while as to the tone quality the time constant is made to be variable by a capacity 17 and a variable resistance 28, and further the volume of sound is made adjustable from the outside by providing a variable resistance 29 for an amplifier 22, whereby each unit is made adjustable from outside respectively. In this way, the adjustment by a user is facilitated and the sounding of a melody can be made pleasant. |
