Back to results
US 5,512,957 AGranted
Method and apparatus for combating co-channel NTSC interference for digital TV transmission
AssigneePhilips Electronics North America Corporation
InventorSamir N. Hulyalkar
Life of this patent
Estimating the term…
Abstract
An ATV receiver having a decoder which is designed to process a subset limited trellis pre-coded television signal. The decoder processes co-channel interference so as to produce at the filter output of a rejection filter, a residual interference spectrum which is as flat as possible. The filter exploits the fact that only the picture and the sound carriers need to be sufficiently attenuated and cancels NTSC co-channel interference with only a small degradation in performance when AWGN is also present.
Claims9
A television receiver comprising:
- means for receiving a transmitted signal having an encoded digital television signal component encoded using a subset limited trellis code, and a co-channel interference component;
- means for flattening the frequency spectrum of the co-channel interference component to produce a filtered encoded digital television signal from the transmitted signal, said means for flattening including a prediction filter having predetermined coefficients;
- and
- decoder means for decoding the filtered encoded digital television signal.
1 more element
A television receiver comprising:
- means for receiving a transmitted signal having an encoded digital television signal component encoded using a subset limited code which has had its symbols interleaved at a transmitter and a co-channel interference component;
- means for flattening the frequency spectrum of the co-channel interference component to produce a filtered encoded digital television signal from the transmitted signal, said means for flattening including a prediction filter having predetermined coefficients;
- symbol de-interleaving means for de-interleaving the symbols of the filtered encoded digital television signal to produce a de-interleaved digital television signal;
- and
- decoder means for decoding the de-interleaved digital television signal.
2 more elements
Dependencies are inferred from the claim text.