System for controlling the operating mode of an adaptive equaliz

Details System for controlling the operating mode of an adaptive equaliz System for controlling the operating mode of an adaptive equaliz

1995-10-04

1997-11-04

Chin, Wellington

Pulse or digital communications

Equalizers

Automatic

333 18, 333 28R, 36472419, 3647242, 375229, H03H 730

Patent

active

056848277

ABSTRACT:
An adaptive equalizer decision circuit for a digital television signal, including a field synchronizing signal, consisting of multilevel symbols and a DC offset representing a pilot. The variation of the DC level of the received signal during the field sync with respect to a predetermined threshold is derived for placing the equalizer in a training signal or data directed operating mode. Another approach determines the difference between a current value of the field sync and each of a plurality of values of the field sync in previous fields and determining therefrom whether the equalizer should be in its data directed mode of operation or in its training signal mode of operation. A modification consists in controlling the step size of the equalizer based upon either the DC level variation or the field sync differences of the received signal. The modification may be used alone or in combination with the equalizer operating mode control.

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patent: 5448601 (1995-09-01), Choi
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