| 摘要 |
PURPOSE:To erase or attenuate echos, by providing a preequalizer at the prestage of a transversal type automatic equalizer. CONSTITUTION:An input signal from an IN terminal is given to a delay line 13 having taps every pulse time interval T0 and it is picked up from each tap to an adder 15 via a weighting circuit. Further, by adjusting each tap weighting circuit suitably, the echo produced at taps of the delay line 3 due to a group delay distortion can be attenuated. In the figure, the prequalizer EQ is shown as 1, a VSB demodulator DEM as 2 and the delay line with taps as phi, respectively. |
