Using equalized data for filter selection in HDTV receiver
AssigneeZenith Electronics Corporation
InventorLarry E. Nielsen
Life of this patent
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Abstract
A digital television receiver includes a filter for minimizing NTSC interference with a received signal having a constant symbol rate. An equalizer has two one symbol delays for each tap. A filtered and a non-filtered version of the received signal are applied to a multiplexer at the input of the equalizer, which is operated at twice the symbol rate. The outputs of the multipliers in the equalizer are combined and applied to a demultiplexer. The filtered and non-filtered equalized signals are compared and a selection as to which of the filtered or non-filtered received signals is to be processed is made based upon the comparison.
Claims10
A method of operating a digital television receiver, having a filter for reducing the effects of NTSC interference on a received signal having a constant symbol rate, comprising:
- developing filtered and non-filtered received signals;
- equalizing the filtered and non-filtered received signals;
- comparing the filtered and non filtered equalized received signals;
- and
- selecting one of the received signals for processing based upon the comparing step.
A method of operating a digital television receiver, having a filter for reducing NTSC interference with a received signal having a constant symbol rate, comprising:
- developing filtered and non-filtered received signals;
- providing an equalizer having a two-symbol delay for each tap;
- operating the equalizer at twice the symbol rate;
- multiplexing and applying the filtered and non-filtered received signals to the equalizer;
- demultiplexing the output of the equalizer to develop equalized filtered and non-filtered signals;
- comparing the filtered and non filtered equalized signals;
- and
- selecting the desired one of the filtered and non-filtered received signals for processing based upon the comparing step.
A digital high definition television receiver for receiving a signal having a constant symbol rate signal comprising:
- filter means for reducing the effects of NTSC interference on said received signal;
- means for supplying said received signal to said filter means for developing filtered and non filtered signals;
- means for equalizing said filtered and non-filtered signals;
- means for comparing said filtered and non filtered equalized signals;
- and
- means for selecting one of said filtered and non-filtered equalized signals for processing based upon said comparison.
A digital high definition television receiver for receiving a signal having a constant symbol rate signal comprising:
- filter means for reducing the effects of NTSC interference on said received signal;
- means for supplying said received signal to said filter means for developing filtered and non filtered signals;
- equalizing means comprising an equalizer having a plurality of taps, a corresponding plurality of multipliers and two one symbol delays for each of said plurality of taps;
- means for operating said equalizer at twice the symbol rate;
- multiplexing means for applying said filtered and non-filtered signals to said equalizer;
- means for demultiplexing the output of said equalizer for developing filtered and non-filtered equalized signals;
- means for comparing said filtered and non filtered equalized signals;
- and
- means for selecting one of said filtered and non-filtered equalized signals for processing based upon said comparison.
Dependencies are inferred from the claim text.