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Signal recording device and method, signal reproducing device and method, medium and information summarizing

A recording device and signal technology, applied in digital recording/reproduction, digital video signal modification, pulse modulation TV signal transmission, etc., can solve the problem that the compression method cannot be used

Inactive Publication Date: 2006-12-27
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the present inventors have found such a problem that when implementing a compression method capable of bitstream conversion, it is sometimes necessary to increase the quantization level, and at this time, the conventional compression method cannot be used

Method used

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  • Signal recording device and method, signal reproducing device and method, medium and information summarizing
  • Signal recording device and method, signal reproducing device and method, medium and information summarizing
  • Signal recording device and method, signal reproducing device and method, medium and information summarizing

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Example 1 and Figures 2 to 4 The quantization step, base quantization step, multiplier, quantization number and multiplier information used in are descriptive only. In short, the quantization level used can be the product of the base quantization level and the multiplier.

[0051] As described above, if the quantization levels used in quantization are converted into recordable quantization numbers and multipliers, the number of quantization levels used in quantization can be extended.

Embodiment 2

[0053] see below Figure 5 , the structure of the video signal recording apparatus used in Embodiment 2 will be described. Figure 5 is a block diagram illustrating the structure of the video signal recording apparatus in the second embodiment. In this embodiment, it is assumed that there are 15 types of quantization levels that can be recorded when represented by 4 data bits, and that there are 31 types of quantization levels used for quantization when represented by 5 data bits.

[0054] Figure 5 Among them, the reference numeral 501 represents the input end of the input video signal, the reference numeral 502 represents the block unit that divides the input signal into blocks, the reference numeral 503 represents the orthogonal transformation unit that performs the cosine transform of the input video signal, and the reference numeral 504 represents that the discrete cosine A quantizer for quantizing the transformed video signal, reference numeral 505 denotes a variable len...

Embodiment 3

[0066] refer to Image 6 and Figure 7 , the video signal recording method according to Embodiment 3 of the present invention will be described below. Image 6 is a flowchart illustrating a video signal recording method according to Embodiment 3. In this embodiment, it is assumed that there are 15 types of recordable numbers of quantization levels represented by 4 data bits, and that there are 31 types of quantization levels used in quantization represented by 5 data bits. It is also assumed that the data bit precision of the AC component capable of variable length encoding is 9 bits, and the quantization output is 12 bits.

[0067] Image 6 In this method, the input signal is quantized, and the quantized signal and quantization level used for quantization are output as data. In Embodiment 3, for the same reason as in Embodiment 1, the quantization level used is not directly recorded.

[0068] Therefore, since the method is the same as in Example 1, refer to figure 2 an...

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Abstract

A signal recording apparatus, has quantization means of quantizing a signal employing a quantization step; quantization information creating means of creating plural pieces of quantization information to specify the quantization step; encoding means of generating an encoded signal from the quantized signal; and recording means of recording a compressed signal having data containing the plural pieces of quantization information and the encoded signal.

Description

technical field [0001] The present invention relates to a signal recording device and method, a signal reproducing device and method, media and information collection. Background technique [0002] As a high-efficiency coding system using VLC (Variable Length Coding) or DCT (Discrete Cosine Transform), a DVCPRO (trade name, whose definition is defined in SMPTE314M, which is a compression method) or MPEG (moving image) is provided. Professional Group) compression, but the details of these compression methods are different. For example, in order to convert a DVCPRO bit stream to an MPEG bit stream, the DVCPRO bit stream must be expanded once to recover the image data, which is then MPEG compressed. [0003] However, with the above method, since the DVCPRO bit stream is expanded once to restore the image data and then MPEG-compressed, the video signal is compressed twice, with the result that image quality inevitably deteriorates. . [0004] On the contrary, the present inve...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N5/917H04N5/92G11B20/10H04N7/30H04N19/40H04N19/46H04N19/48H04N19/60H04N19/625H04N19/70H04N19/85H04N19/91
CPCH04N19/00096H04N19/00775H04N7/30H04N19/00472H04N19/00563H04N7/26941H04N7/26085H04N7/3027H04N19/126H04N19/40H04N19/48H04N19/60
Inventor 藤原裕士西野正一宫下充弘
Owner PANASONIC CORP