| 摘要 |
PURPOSE:To extract a reference component allowing a reference signal to be followed even when time-base fluctuation is generated during transmission by using the carrier of plural frequencies, in which phase relation is fixed, selectively allowing the specified time slot of the carrier of the specified frequency to stop using, mixing the respective carriers after amplitude modulation and executing the transmission. CONSTITUTION:Carrier oscillators OSC1-OSC4 output signal to be synthesized by a master oscillator (OSC)1. Switches SWS1-SWS4 and SWC1-SWC4 turn on/off this carrier output and these switches are driven by data A-T in a register (20 bit) 2. Thus, the signals of the 20 bit on the register 2 are mixed by a mixer 3 and outputted to an output terminal 4 with the rate of 5 bit in each 1c of a highest carrier frequency f4. A setting is executed by a presetter 5 so that anyone of the data C-T can be stopped. Next, for a transmission signal including the time-base fluctuation to be inputted from an input terminal 6, the carriers of frequencies f1-f4 are extracted by a filter 7 and an oscillator (PLL OSC)8 where a phase lock is loaded becomes the master oscillator. The output of this PLL OSC8 follows the time-base fluctuation of the transmission signal. |
