Method and apparatus for decoding broadcast digital HDTV in the

Details Method and apparatus for decoding broadcast digital HDTV in the Method and apparatus for decoding broadcast digital HDTV in the

1993-02-22

1995-09-26

Kostak, Victor R.

Television

Image signal processing circuitry specific to television

Noise or undesired signal reduction

348618, 348622, H04N 521

Patent

active

054537975

ABSTRACT:
An HDTV receiver takes advantage of the detailed structure of the NTSC signal, namely the periodicity of the signal caused by the horizontal scan rate, in order to remove co-channel interference. A feedforward circuit is used to form an estimate of a current co-channel interference value from co-channel interference values occurring on previous scan lines. The estimate is subtracted from the signal to remove the co-channel interference at the expense of generating intersymbol interference. The circuit uses a form of decision-feedback equalization (DFE) in order to remove the intersymbol interference. The periodicity of the NTSC signal is exploited to allow the use of a high-rate trellis code in the DFE circuit.

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