| 摘要 |
PURPOSE:To enhance the improvement of the S/N of a service channel (SC) signal by sampling only signal in a specified part of a control signal generated by multiplying a base band signal obtained by DC-AC detecting a polyphase phase modulated wave and adding it to a voltage controlled oscillation part. CONSTITUTION:In the case of transmitting the service channel(SC) signal such as an order signal and a monitoring signal, etc., only control signal in the specified part, that means the part of a normal phase state, of the control signal is sampled by a sampling means 4 by using a clock outputted from a multiplier 3 in order to be added to the voltage controlled oscillator 2. Therefore the C/N of the control signal can be improved. Thus, the S/N of the SC signal and the deterioration of the error rate of a main signal can be improved.
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