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US 5,692,010 AGranted
Adaptive equalizer with impulse noise protection
AssigneeZenith Electronics Corporation
InventorLarry E. Nielsen
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Abstract
A digital receiver receives a multi level symbol signal that includes a frame sync. An equalizer is supplied with the signal and corrects for errors that are determined to exist therein on the basis of comparing the frame sync with a known value thereof or comparing the average level of the multi level symbols to an estimated (known) value thereof. A threshold circuit is included for rejecting impulse noise in the error signal that exceeds a threshold level that is higher than the maximum symbol level in the symbol.
Claims2
A digital television receiver comprising:
- means for receiving a multi level symbol signal;
- means for developing an error signal indicative of impairments in said received multi level symbol signal;
- means for compensating said error signal to nullify the effects of said impairments therein due to impulse noise;
- means for supplying said compensated error signal for equalizing said received multi level symbol signal;
- wherein said compensating means includes means for establishing a threshold for said received multi level symbol signal that is greater than the maximum symbol level in said received multi level symbol signal;
- and
- means for nulling the effects of said impulse noise exceeding said threshold in said error signal.
4 more elements
Dependencies are inferred from the claim text.