| 摘要 |
PURPOSE:To improve the frequency accuracy, to reduce power consumption and to attain cost-down of a tone generator by providing a correction circuit retarding the count operation of a frequency circuit of original oscillation comprising a frequency dividing counter and using the correcton circuit to give a signal retarding the count with a proper interval to the frequency divider circuit. CONSTITUTION:When n-set of reset signals RS1 having a frequency being 1/m frequency division of an original oscillation signal phi0 outputted from a frequency divider counter 21 enter a counter 11 in a correction circuit 10, a reset circuit 12 resets the counter 11 and the counter 21 is reset again with a delay of one clock than the reset signals RS1. As a result, an output signal RS1 of the reset circuit 22 fed to a Jonson counter (4) is subjected to extended pulse width by (m+1) times once per n-time, whose pulse width has been m-time thatof the original oscillating signal phi0. That is, the frequency dividing ratio is m+(1/n) and the original oscillating signal phi0 is frequency divided by the frequency dividing ratio in fractional expression.
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