| 摘要 |
PROBLEM TO BE SOLVED: To obtain the clock of several to ten and several MHz from the carrier of communication within the law regulation of a weak radio wave and to operate a microprocessor. SOLUTION: A parallel tuning circuit 301 receives MF two-phase modulation signal. A clock generation circuit constituted by a full wave rectifying circuit 103 which full-wave-rectifies the received two phase modulation signal, a binarization circuit 115 binarizing the output of the full wave rectifying circuit, a phase comparison circuit 116 connected to the binarization means, a low pass filter 117 connected to the phase comparison means, a voltage control oscillator 18 oscillating the clock based on the output voltage of the low pass filter and a frequency-dividing circuit 119 which frequency-divides the output clock of the voltage control oscillator by N generates the continuous clock pulse of an HF band frequency, which is phase-synchronized with the carrier of a reception signal and which is N-times. Then, the microprocessor 121 operates by the clock pulse generate by the clock pulse generation means 307. |
