| 摘要 |
PURPOSE:To attain the normal restoration of a demodulator even in an asynchronizing state by providing a means discriminating the arrangement on a space diagram and a means using a control signal of each tap by a logic operation so as to make the qualizing capability of a transversal equalizer to be enhanced sufficiently. CONSTITUTION:The titled system is provided with a discriminating means receiving the output of a demodulator 2 so as to discriminate whether or not the arrangement of each signal of a multi-value digital modulation wave on the space diagram is in a region other than the signal arrangement region of each quadrant of the space diagram, and a control signal generating means generating a control signal of each tap in a transversal equalizer 1 so as to generate a control signal of the demodulator 2 at carrier asynchronizing state by the logic operation as to the output of the discriminating means and the output of the demodulator. Thus, the equalizing capability of the transversal equalizer 1 in the process where transmission distortion transits from a large state into a small state is enhanced sufficiently and the demodulator is restored from the asynchronizing state into the synchronizing state at a large transmission distortion. |
