| 摘要 |
PURPOSE:To omit the setting of the action point at the transmission side which is affected by the characteristics of the transmission line, by installing the circuit which detects the action point of the power amplifier of the repeater at the reception side after passed through the repeater. CONSTITUTION:The modulated wave applied to terminal 201 is sampled by sampler 203 and with the cycle of the symbol timing signal applied to terminal 202. This sampling value is multiplied through multiplying circuit 204 to be applied to switch 205. At the same time, the output sampling value of sampler 203 is applied to amplitude detector 206, and this detection output controls switch 205. The two output of switch 205 are applied to 1st and 2nd filters 207 and 208, and the output of the 1st and 2nd filters are applied to phase comparator 209. Then the comparion output is delivered to terminal 210 in the form of the action point detection signal. |
