| 摘要 |
PURPOSE:To prevent an automatic equalizer from excessive correction and system dispersion by compressing the quantity of an error when the instantaneous ampitude value of received data exceeds a prescribed value, and sending the compressed value to a correcting means. CONSTITUTION:The absolute value of large amplitude generated in an instantaneous value detecting circuit 7 by an impulse noise or the like of a transmission line is inputted to a decision circuit 8. When an instantaneous amplitude value exceeds a reference value, the decision circuit 8 decides the generation of amplitude disturbance and generates a signal ''1''. A control signal generating circuit 9 generates a control signal of ''0'' for a fixed period and a selecting circuit 10 selects the output of a subtractor 11 for said period. An excessive error from a discriminator 6 is contracted by a previously fixed compression factor and the contracted value is supplied to a correcting circuit 4. Even if the disturbance is generated in the transmission line, the automatic equalizer is prevented from excessive correction and system dispersion and can be returned to normal operation immediately after the recovery of the transmission line. |
