| 摘要 |
PURPOSE:To adjust the depth of the squelch operation by the turn-on and off signal transmitted from the remote controller, by setting the depth of the squelch operation preliminarily in the receiving device side by the counter. CONSTITUTION:When the signal given to control signal input terminal 10 is L, counter 7a is reset, and data set in preset terminal 11 is loaded to counter 7b. Next, when terminal 10 becomes H, counter 7a starts counting. The output of DA converter 8 rises in proportion to the count number; and when squelch circuit part 5 operates, counter 7b starts counting. After counter 7b counts the number of pulses of oscillator 6 corresponding to the loaded value, output CA becomes L to stop counting of counter 7a. |
