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TCM decoder of high definition television receiver and decoding method

A decoder and receiver technology, applied in the field of TCM decoder and its decoding, can solve the problems of undisclosed structure of TCM decoder

Inactive Publication Date: 2003-12-10
SAMSUNG ELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the structure of the TCM decoder has not been disclosed

Method used

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  • TCM decoder of high definition television receiver and decoding method
  • TCM decoder of high definition television receiver and decoding method
  • TCM decoder of high definition television receiver and decoding method

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Embodiment Construction

[0045] In order to implement the decoder of the present invention, the effect of the NTSC band-stop filter must be considered when the receiver of the system employs a band-stop filter.

[0046] When an NTSC signal exists in an HDTV channel, the NTSC signal is considered as an interference factor. In order to suppress the influence of interference, the receiver of the GA-VSB system uses an NTSC band rejection filter (hereinafter referred to as a comb filter) to remove the modulated carrier of the NTSC signal. 5A and 5B show the structure and frequency characteristics of the comb filter 150, respectively. As shown in Figure 5A, since the NTSC signal has a predetermined carrier frequency offset (approximately 0.89 MHz) relative to the VSB signal, the same result is obtained in the co-channel case of broadcasting HDTV and NTSC simultaneously, as if the baseband The zone is modulated with this frequency offset. NTSC signal energy is concentrated in the original DC component, ie ...

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Abstract

The invention relates to a trellis coded modulation decoder which is used in a high definition television receiver. The trellis coded modulation decoder comprises a section synchronization suspend unit, a field delayer and a Viterbi decoder, wherein the data of twelve code elements are connected before and after the section synchronization under an eight state by the section synchronization suspend unit, and an input high definition television signal which is not changed is transported under a four state. The data of a data segment rightly before and after the field synchronization section are mutually directly connected, and the output of the field retarder are all decoded under the eight state and the four state. Therefore, the effect of the section synchronization and the field synchronization signals which are not coded is used to decide, and thereby achieving steadily deciding.

Description

technical field [0001] The present invention relates to a trellis coded modulation (trellis-coded modulation: TCM) decoder and a decoding method thereof for a high-definition television (HDTV) receiver, in particular to a TCM decoder for an HDTV receiver and its decoding method. decoding method. Background technique [0002] In general, large-screen, high-resolution Grand Alliance High Definition Television (GA-HDTV) has been developed in the United States, and a vestigial sideband (VSB) modulation method for digital transmission has been adopted as a modulation method of GA-HDTV. Therefore, this GA-HDTV using the VSB modulation method is called a "GA-VSB" system. GA-HDTV has used an 8-VSB modulation method using an 8-level terrestrial broadcast mode, and a 16-VSB modulation method using a 16-level high-speed cable mode. [0003] One of the characteristics of the GA-VSB system, which is the HDTV standard for US-type terrestrial broadcasting, is the use of the TCM method to...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N19/00H03M13/23H04L1/00H04N5/21H04N7/015H04N19/102H04N19/166H04N19/194H04N19/196H04N19/423H04N19/65H04N19/70H04N19/80H04N19/85H04N19/88H04N19/89
CPCH03M13/256H04L1/006H04L1/0054H04N5/4401H04N5/211H04N21/426H04N7/015H04N21/43
Inventor 申贤秀
Owner SAMSUNG ELECTRONICS CO LTD
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