Automatic Equalizer

Excavating

Patent

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Details

375230, G06F 1100, H03H 730

Patent

active

054327946

ABSTRACT:
An adaptive type automatic equalizer is provided with a mean square error detection circuit including a square circuit 119 for squaring the absolute value of an equalization error, and a low-pass filter 120. A comparator 102 compares the detection value of the detection circuit with a predetermined threshold value .lambda.. When the detection value is larger than the threshold value, the type of the adaptive type automatic equalizer is switched from normal equalization to blind equalization. Even when the adaptive type automatic equalizer diverges, it can be controlled to converge again. When a level change amount detector 101 for detecting a level change amount received from a line at an input point detects a level change exceeding a predetermined level, a timer A 119 measures the duration time of the level change. When the measured duration exceeds a predetermined period of time, the timer switches a switch 124 to shift an equalization mode from normal equalization to blind equalization. The blind equalization processing time is measured by a timer B 120. When the blind equalization processing time reaches a predetermined period of time, the switch 124 is switched again to shift the equalization mode from blind equalization to normal equalization.

REFERENCES:
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patent: 4928287 (1990-05-01), Tanaka
patent: 4979211 (1990-12-01), Bevenuto et al.
patent: 4995057 (1991-02-01), Chung
patent: 5036525 (1991-07-01), Wong
patent: 5111481 (1992-05-01), Chen et al.

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