| 摘要 |
PROBLEM TO BE SOLVED: To allow the circuit to receive a signal at all times with the same frequency for fine-adjustment once without fine-adjustment of a received frequency again. SOLUTION: A microcomputer 5 changes a PWM(pulse width modulation) signal to apply just tuning (f0) to a tuner 2 and receives a reception signal fine-adjustment command from a remote control light receiving circuit 8 to apply fine-adjustment (Δf) to a reception frequency by changing somewhat the PWM signal and stores a difference of corresponding VT(voltage of timing) data to theΔf to a memory 7. After the microcomputer 5 applies just-tuning (f0) of the tuner 2 to this channel, the reception frequency is deviated from f0 by the frequencyΔf corresponding to difference data to be stored thereby obtaining the same reception frequency as that by fine-adjustment.
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