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Televison signal recording/reproducing apparatus and method and DC shifter

A TV signal and signal technology, applied in the direction of color TV signal processing, TV, color TV, etc., can solve problems such as wrong image, distortion, and great difference in signal value, and achieve the effect of avoiding compression distortion

Inactive Publication Date: 2004-12-08
SONY CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the large difference in signal values ​​between the DCT block and the auxiliary signal, the DCT process calculates wrong DCT coefficients and produces final image distortion

Method used

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  • Televison signal recording/reproducing apparatus and method and DC shifter
  • Televison signal recording/reproducing apparatus and method and DC shifter
  • Televison signal recording/reproducing apparatus and method and DC shifter

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Embodiment Construction

[0049] The invention will now be described with reference to the drawings, wherein like reference numerals indicate like or similar parts.

[0050] PAL+ standard

[0051] The PAL+ standard will now be described in more detail, paying particular attention to the aforementioned distortion issues.

[0052] Such as Figure 28 Shown is the format used to transmit the PAL+ signal corresponding to one television picture frame. The PAL+ transmission consists of 625 lines of the PAL+ signal sampled at 13.5MHz. Sampling starts at line 23 with sample number 10. The sampled PAL+ signal is 4:2:2 (Y:C B :C R ) format transmission, which means that the luminance signal is sampled four times per sample, and the blue difference signal (C B ) and red difference signal (C R ) is sampled twice. The 4:2:2 format works by dividing the PAL+ signal into two fields, Field 1 and Field 2 ( Figure 28 The two separate regions labeled "letterboxes" described in , are produced and alternate color-...

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PUM

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Abstract

Recording and reproducing a television signal with a DC shifter prevents compression distortion of a PAL plus television signal. The PAL plus television signal includes a vertical resolution signal for enhancing vertical resolution which vertical resolution signal is included in the same compression blocks as some of the component video signals. Such compression blocks are shifted to a DC set up value so that the signals within those compression blocks do not have varying DC offsets which otherwise could result in compression distortion. Similarly, upon reproduction, the DC set up value is removed after decompression and the original television signal is restored with complete vertical resolution.

Description

technical field [0001] This invention relates to the digital recording and playback of a television signal, and more particularly to the digital recording and playback of a PAL+ television signal. Background technique [0002] Television signals are broadcast using various transmission standards. The PAL system is such a standard mainly used in European countries. PAL+ is the second-generation broadcast standard of PAL, which has better picture quality than its original standard. Another distinctive feature of the PAL+ standard is that the aspect ratio of the television picture is 9:16, which is more aesthetically pleasing than the 3:4 aspect ratio mainly used by television receivers until now. Such as Figure 27A as shown, Figure 27B Superimposed over the usual 3:4 aspect ratio of television receivers, the PAL+ format of the 2000-2000 video demonstrates the aesthetically pleasing difference between the two standards. The PAL+ system is compat...

Claims

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Application Information

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IPC IPC(8): H04N5/92H04N5/783H04N7/00H04N9/804H04N9/808H04N9/82H04N9/83H04N11/16
CPCH04N7/007H04N5/783H04N9/8216H04N9/8233H04N9/832H04N9/8047H04N11/167H04N9/80
Inventor 叶多启二柳原尚史
Owner SONY CORP
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