| 摘要 |
PURPOSE:To eliminate the deviation in the reproducing speed of sounds and selecting timings of switches by converting writing clocks with a frequency-voltage converter thereby obtaining a voltage for controlling selection with switches. CONSTITUTION:A frequency-voltage converter 31 is inputted with the output of a voltage controlling oscillator 24 for generating writing clocks and converts the frequency thereof to a DC voltage. A reproducing speed is controlled by a variable resistor VR1 19 for setting the reproducing speed. The change in the output frequency of the oscillator 24 corresponds as it is to the change in the reproducing speed, and the DC voltage converted from said frequency is inputted as a voltage for controlling selection with a switch 28 to a window comparator 32. The comparator 32 outputs the signal which is not subjected to processing for compressing and extending of time axis by closing the contact (a) 29 of the switch 28 when the ratio between the recording speed and the reproducing speed is around 1; otherwise the comparator outputs the signal subjected to said processing by closing the contact (b) 30 of the switch 28. |
