| 摘要 |
PURPOSE:To select the sound of time striking sound arbitrary, by selectively inputting and controlling an arbitrary sound frequency signal out of plural sound frequency signals having different frequencies into a mixing gate. CONSTITUTION:An oscillation signal from a crystal oscillator is inputted from an input end 3 into frequency diving circuits 1 and 2. Thus, the oscillation part is composed.The frequency dividing circuit 2 outputs the divided output of a counter B1 as a sound frequency signal f1, and the divided output of a counter B2 as a sound freqnency signal f2. The one side signal f1 is inputted into one input of mixing gate OR1 through the input of a NOR circuit NOR1, and the other signal f2 is directly inputted into the other input thereof, so that the output of the mixing gate OR1 is picked up as a clock signal for sound. This control may be achieved by opening and closing a selector switch SW1 of a control circuit 4 to control the mixing gate OR1, so that clock signals for single or compound sounds may be arbitrarily prepared. |
