Television – Image signal processing circuitry specific to television – Noise or undesired signal reduction
Patent
1995-10-27
1997-02-11
Peng, John K.
Television
Image signal processing circuitry specific to television
Noise or undesired signal reduction
348 21, 348409, 375231, 375233, 375321, 375350, H04N 544
Patent
active
056026021
ABSTRACT:
A television receiver for reducing a co-channel interference comprises a receiver for receiving a transmitted digital television signal having an encoded digital television signal component, a co-channel interference component, and a noise component, the receiver further providing a received output signal. A simplified rejection filter filters the received output signal to reduce the co-channel interference component thereof. The rejection filter comprises a simplified prediction filter having a fixed number L of tap coefficients z.sub.1, . . . , z.sub.L, wherein the number L is less than a number N of tap coefficients for an optimal prediction filter. The optimal prediction filter corresponds to a prediction filter implemented at a television transmitter for precoding the digital television signal prior to being transmitted by the television transmitter. The rejection filter means further provides a filtered output signal. An equalizer and phase tracker is provided for operating on the faltered output signal. The equalizer and phase tracker comprises (i) a forward equalizer having an input for receiving the filtered output signal, (ii) a modified slicer responsive to an output of the forward equalizer for providing first and second modified slicer output signals and further for providing an error signal, (iii) a feedback equalizer having an input for receiving the first modified slicer output signal, and (iv) an equalizer tap-adaptation device responsive to the error signal and the inputs of the forward equalizer and feedback equalizer, respectively, for producing modified tap coefficients. The equalizer tap-adaptation device provides the modified tap coefficients to the forward and the feedback equalizers for use by the forward and feedback equalizers, respectively, in minimizing a noise enhancement effect of the noise component of the received signal. Lastly, a decoder decodes the output signal of the equalizer and phase tracker and produces a decoded digital television signal.
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Marion Michael E.
Murrell Jeffrey
Peng John K.
Philips Electronics North America Corporation
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