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Transcoder device for and motion picture communication system

A code converter and code conversion technology, applied in the field of code converter equipment, can solve the problems of increased circuit size and power consumption, coded bit streams that cannot be decoded, and a large amount of calculation, so as to achieve the effect of suppressing the amount of calculation

Inactive Publication Date: 2009-12-23
NEC CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Very large computational load increases circuit size and power consumption
[0016] In addition, when the moving picture encoding device uses the same compression coding format as the moving picture decoding device and does not provide the above transcoder device, there is a problem that it depends on whether an encoding tool is used or how the parameter values ​​used in encoding are. set, the encoded bitstream output from the motion picture encoding device cannot be correctly decoded by the motion picture decoding device

Method used

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  • Transcoder device for and motion picture communication system
  • Transcoder device for and motion picture communication system
  • Transcoder device for and motion picture communication system

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Embodiment Construction

[0040] A transcoder device for transcoding a compressed and encoded bitstream of a moving image at a syntax level according to an embodiment of the present invention includes: a variable length decoder ( Figure 7 Reference numeral 203 in ), which uses a variable-length code table to perform variable-length decoding on parameters other than the AC component in an input video packet, and uses a variable-length code table when reversible variable-length coding is not used , or use a reversible variable-length code table when reversible variable-length coding is used, to perform variable-length decoding on the AC component; the parameter sequence changer ( Figure 7 Reference numeral 204 in ) which rearranges the bit string based on the result of variable length decoding in the variable length decoder; the variable length coder ( Figure 7 Reference numeral 205 in ), which uses a variable-length code table when no reversible variable-length coding is used, or uses a reversible va...

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Abstract

A transcoder device includes means for receiving encoding information transmitted from a motion-picture encoding and transmitting device and decoding information transmitted from a motion-picture receiving and decoding device, referring to the encoding information and the decoding information to determine whether the syntax in a video packet transmitted from the motion-picture encoding and transmitting device is transcoded, and outputting transcoding control information, and means for transcoding an encoded bitstream that is input in the syntax level on the basis of the transcoding control information and transmitting the transcoded encoded bitstream to the motion-picture receiving and decoding device.

Description

technical field [0001] The present invention relates to a transcoder device using a compressed encoding format for moving pictures, and more particularly to a transcoder device for transcoding a compressed and encoded moving picture bitstream at the syntax level . Furthermore, the present invention relates to a moving picture communication system including such a transcoder device. Background technique [0002] In recent years, for example, the International Telecommunication Union Telecommunication Standardization Sector (ITU-TS) recommended by the International Organization for Standardization (ISO) / International Electrotechnical Commission (IEC) as international standards H.261 and H.263 and the Moving Picture Experts Group (MPEG) -4 is a well-known compression encoding format for efficiently transmitting moving image signals within a narrow bandwidth. [0003] Compression coding formats for moving pictures, such as H.261, H.263, and MPEG-4, employ hybrid compression in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N7/32H04N7/50H04N19/40H03M7/42H04N19/00H04N19/44H04N19/46H04N19/48H04N19/625H04N19/70H04N19/89H04N19/91
CPCH04N19/00781H04N19/00933H04N19/00278H04N19/00236H04N19/00884H04N19/00272H04N19/00951H04N19/00563H04N19/00266H04N19/00472H04N19/176H04N19/70H04N19/172H04N19/61H04N19/91H04N19/164H04N19/174H04N19/48H04N19/89H04N19/40
Inventor 小山和広小泽一范
Owner NEC CORP
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