Patent ID: 6538704
Filing Date: 2003-03-25
Classification: H04N

Abstract:
Apparatus for improving channel acquisition and reception in a digital television receiver comprising:first and second tuners for receiving an input signal; a memory connected to the first and second tuners for storing a channel occupancy database and preliminary equalization coefficients for channels in the database; a control microprocessor connected to the memory for accessing the memory in response to selection of a channel, the control microprocessor loading preliminary equalization coefficients into said first tuner for the selected channel and controlling the second tuner to scan non-selected channels in the database; and a channel measurement module connected to the control microprocessor for measuring signal parameters of an output signal of the second tuner and to provide data to the control microprocessor, the control microprocessor using the data from the channel measurement module to perform calculation to obtain the preliminary equalization coefficients and store the preliminary equalization coefficients in the memory, wherein the control microprocessor periodically performs equalizer coefficient calculations for channels in the channel occupancy database of the memory by comparing calculated equalizer coefficient calculations for scanned channels to the preliminary equalizer coefficients stored in the memory, and the control microprocessor evaluating the calculated equalizer coefficients to determine if the calculated equalizer coefficients are likely to be better than the preliminary equalizer coefficients stored in memory, and the control microprocessor updating said preliminary equalizer coefficients stored in memory with the calculated equalizer coefficients when the evaluation indicates that the calculated equalizer coefficients are likely to be better than the coefficients stored in memory.