| 摘要 |
<p>PURPOSE:To make the pulse period constant by providing a flip-flop set by a CMI signal and reset by the output of a delay circuit and a band pass filter inputting the output of the flip-flop and extracting 1/T component of a CMI signal. CONSTITUTION:The flip-flop 1 having a set terminal and a reset terminal, the delay circuit 2 retarding a signal by a time 1/2f0 and the band pass filter 3 having a center frequency f0 are provided, Since the CMI code where a pulse is located at the latter half of a time slot as a '0' code is inputted, the set/reset terminal of the flip-flop 1 is operated at the trailing of the pulse. The input signal pulse En is subjected to level inversion from an H to an L level between time slots only, the flip-flop is set at that time and the pulse is led. After the time for a half time slot elapses, reset is applied by a signal En', the pulse is descended and a signal Fn including an f0 component appears at the output, the sinusoidal wave of the frequency f0 is obtained by giving the signal to the band pass filter 3.</p> |
