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Recursive metric for NTSC interference rejection in ATSC-HDTV trellis decoder

A decoder and grid technology, applied in the field of video signal receivers, can solve problems such as performance degradation

Inactive Publication Date: 2006-03-01
INTERDIGITAL CE PATENT HLDG
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Problems solved by technology

But relative to the non-NTSC interference case, the performance of the 8-state trellis decoder 202 with Euclidean metric will drop by about 3.0-3.75dB

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  • Recursive metric for NTSC interference rejection in ATSC-HDTV trellis decoder
  • Recursive metric for NTSC interference rejection in ATSC-HDTV trellis decoder
  • Recursive metric for NTSC interference rejection in ATSC-HDTV trellis decoder

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Embodiment Construction

[0024] The present invention provides an improved metric for use in trellis decoders for HDTV receivers in the ATSC terrestrial broadcast standard adopted in the United States. Specifically, the present invention utilizes the recursive non-Euclidean family of optimal and sub-optimal trellis decoder metrics when processing a received HDTV signal with a comb filter to remove NTSC co-channel interference. As will be described in more detail below, the disclosed recursive metric performs better than the Euclidean metric for the case of NTSC interference and hence comb filters. Additionally, the recursive family of metrics performs better than the truncated metrics described in the aforementioned co-pending US application by Markman et al. ATSC-HDTV receiver and raster decoding

[0025] look now image 3 , wherein a block diagram is drawn to illustrate in more detail the receiver 121 of the system 100 in a preferred embodiment of the present invention. With HDTV receiver 121, the ...

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Abstract

In a system for receiving a signal containing digital data representing HDTV image information in the form of multilevel symbols formatted into groups of successive fields, each field comprising a field segment, a plurality of data segments, and associated sync components, the received signal is demodulated to produce a demodulated signal. The demodulated signal is comb-filtered to reject NTSC co-channel interference to produce a filtered signal. The filtered signal is trellis decoded with a trellis decoder employing a recursive non-Euclidean metric.

Description

technical field [0001] The present invention relates to the video signal receiver that receives high-definition television (HDTV) signal, relate to demodulation and comb filtering after adopting raster decoder to decode the received VSB modulated HDTV signal, with One such problem is to suppress NTSC co-channel interference. Background technique [0002] In a data transmission system, data such as audio and video television (TV) data is transmitted to a plurality of receivers. In the field of television signal transmission systems, the current NTSC (National Television Systems Committee) transmission standard is being replaced by a higher quality system called HDTV, or the ATSC+HDTV standard (see Advanced Television Systems Committee, ATSC Digital Television Standard , Document No. A / 53, 16 September 1995). This HDTV signal is a signal of the VSB modulation (Vestigial Sideband) type proposed by the American Major League. [0003] This ATSC-HDTV standard requires an 8-VSB ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N5/44H04N5/21H04N5/455H03M13/25H04B1/10H04L1/00H04N11/00
CPCH04N11/002H04N5/21H04L1/0047H04L1/0054H04L1/006H04L1/0036H04N5/4446H04N5/4401H04N21/426H04N11/24H04N7/015
Inventor I·马克曼
Owner INTERDIGITAL CE PATENT HLDG
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