SYSTEM FOR COMPENSATING DIFFERENTIAL PHASE/DIFFERENTIAL GAIN

PURPOSE:To perform the DG/DP compensation of a signal without generating a transient error by compensating a control delay with making the output of a main line DA converter and that of a controlling DA converter have a delay difference. CONSTITUTION:A data time base-corrected at a TBC and inputted from a terminal 1 is delayed at a digital delay 11 and inputted to a main line DA converter 2. Meanwhile, the data added on the terminal 1 is also inputted to a compensating DA converter 12 other than the digital delay 11. The output of the compensating DA converter 12, the low-pass component extracted at a low-pass filter 6, is added to a phase converter 3 as a modulation signal having an appropriate amplitude by an amplitude adjuster 7, and the main line DA converter outputs the signal in which the DP is corrected after phase modulation. The signal is demodulated to an original signal at an interpolation filter 4, however, the DP is already compensated. At the next, the signal is separated to a signal Y and a signal C at a Y/C separator 5, and the signal C is inputted to a multiplier 8 and is amplitude-modulated with the signal that a modulation signal obtained from the output of the low-pass filter 6 is delayed by a delay 13, and is consolidated with the signal Y at a Y/C consolidator 9 and the output in which the DP and the DG are compensated can be obtained at a terminal 10.