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OwnerAllen Le Roy Limberginventor
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Broadcast DTV signals are improved by including in each of their successive data fields a training signal for the adaptive channel-equalization and echo-cancellation filtering in receivers. The training signal in each data field includes a prescribed number of cycles of a particular pseudo-random noise sequence extending over a plurality of data segments to provide a training signal for the adaptive filtering that is of longer duration than one of said data segments. Each data segment in each data field begins with a data segment synchronizing sequence, and the training signals incorporate some of these data segment synchronizing sequences within themselves. Receivers are described that initialize the parameters of the adaptive filtering using discrete Fourier transform calculations on the training signal, and receivers are described that initialize the parameters of the adaptive filtering using the results of match filtering for the particular pseudo-random noise sequence.
A method of structuring each of a succession of consecutive data fields for digital television broadcasting to at least one receiver having adaptive equalization and echo suppression filtering therein, said method comprising steps of:
Electromagnetic energy varying in accordance with a baseband digital television signal composed of a succession of data fields each of a prescribed time duration, each said data field consisting of a prescribed number of data segments each of similar time duration, each said data segment including a prescribed number of symbols, each said data segment beginning with a data segment synchronizing signal composed of a number of symbols of a first level and a number of symbols of a second level occurring in a prescribed sequence, said baseband digital television signal comprising:
A receiver for digital television signals, said receiver comprising:
Dependencies are inferred from the claim text.