Several Radio And Television Commonly Used Digital Video Encoding Technology
Present, the TV equipment is gradually transition from analog to digital
, SONY, Panasonic, JVC and other companies have launched a new digital camera, recording, knitting equipment. In today's television technology, digital recording and editing has been widely used.
Digital video recording formats are non-compressed and compressed into two categories. Non-compressed recording format of the D1, D2, D3, D5 series, it is a direct record of the original signal bit-rate input signal, to maintain the original level of the signal for lossless recording. Recording is divided into digital component (D1, D5) and digital composite (D2, D3), they represent the highest standards of video device, the highest image quality, minimal signal loss, but the image signal data as a large volume of the machine hardware requires extremely harsh, but very expensive, although the product has been available for several years, but only a small number of highly demanding on the quality of video production companies. The compression format is the use of digital video compression technology, often with DV, MPEG-2, M-JPEG, etc., and to develop a variety of data compression standard, so there is a corresponding digital Betacam (DVW), DV, DVCPRO, DIGITAL -S, DVCAM, Betacam-SX specifications such as digital video recorders, which record the image signal compression at the tape again, its purpose is to ensure that the premise of image quality, reduced image data signal, reducing the equipment size, reduced tape usage, with minimal signal loss to the best possible results, thereby reducing equipment costs.
1, the international standard for digital video technology
(1) CCIR601 Recommendation To facilitate the international exchange programs, to eliminate differences in standard between digital devices, so that 625-line television system with 525-line television systems can be compatible, in February 1982 the International Radio Consultative Committee (CCIR, now changed to the International ITU Radio Communications, which ITU-R) 15th plenary meeting adopted recommendation 601, OK to component-based code: the luminance component Y, and two color difference components RY, BY as the basis for coding, as the television studio Room number coding international standard.
(2) H.261 standard H.261 referred to as p64. The standard for TV phone and video conferencing, image coding algorithm is real-time processing, and the minimum delay time, the image and voice in close coordination to achieve full-color real-time motion video transmission, and to achieve high compression ratio. The standard in 1990 by the International Telegraph and Telephone Consultative Committee (CCITT) enactment.
(3) JPEG standard Still image data compression standard JPEG (JointPhotographicExpertsGroup), the Joint Photographic Expert Group operation is the International Standards Organization (ISO), International Telegraph and Telephone Consultative Committee (CCITT) and the International Electrotechnical Commission (IEC) 3 international organizations, in completed by 1991. ISO standard JPEG is also the recommendation of CCITT standards, the goal is to compress still color image data, are used for satellite transmission of news pictures and storage, and graphics, image processing and other aspects of literature.
(4) MPEG standards With digital audio and digital video technology, widely used, ISO's Moving Picture Experts Group (MovingPictureExpertGroup) in November 1991 proposed standard draft proposal ISOll172, commonly known as MPEG-1 standard, which in November 1992 through. MPEG-1 standard for digital rate of around 1.5Mbps application environment, that is for the CD-ROM CD-ROM video storage and playback developed.
MPEG-2 is developed by the MPEG 2 standard, in November 1994 formally established as an international standard. MPEG-2 is "moving images and sound information related to universal coding" (GenericCodingofMovingPicturesAssociatedAudioInformation) standard. Recognized as a compression scheme, the standard is open, technology and low cost, interoperability and flexibility, choose bitrate scalability and vendor support of many advantages in networking, telecommunications, satellite and other fields to be used .
by:heiyou
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Several Radio And Television Commonly Used Digital Video Encoding Technology Anaheim