Television – Format conversion – Changing number of fields for standard conversion
Patent
1995-11-06
1998-11-24
Lee, Michael
Television
Format conversion
Changing number of fields for standard conversion
348441, 386131, H04N 5782
Patent
active
058414800
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Technical Field
This invention relates to high definition television and motion picture film images and, more particularly, relates to a method and apparatus for converting without loss of picture information a high definition television format to and from a given recorder/player format, and a motion picture film image format to and from a given recorder/player format.
2. Related Information
Prior to the introduction in the United States and Japan of the existing NTSC standard television signal format and the introduction in Europe of the PAL and SECAM formats, there was considerable discussion over which broadcast black and white format to choose. Some broadcast formats were desirable because they exhibited less RF interference when transmitted. Other broadcast formats were desirable because they delivered a television picture having a sharper or less choppy image. Discussion again occurred, upon the introduction of color television, over which color signal broadcast format to choose and whether the chosen color format should be compatible with the broadcast black and white television format. In the United States today, the same issues are again being raised over the choice of a second generation television format--commonly known as high definition television (HDTV) or advanced television (ATV). Recent issues include discussion concerning which format is best suited for conventional over-the-air broadcast as well as best suited for transmission over new mediums such as fiber optic cable, coaxial cable, telephonic, broadcast satellite, and pre-recorded mediums. The recent issues include discussion of whether the new HDTV format should be compatible with the present NTSC format. While the Federal Communications Commission of the United States would like the new format to be NTSC compatible, there is considerable influence world-wide to adopt a totally new standard. The discussion further includes the issue of whether a proposed format will be adversely affected during broadcast or transmission on the new mediums and whether such a proposed format will subjectively provide an adequate picture. Many formats have been proposed for adoption by proponents both inside and outside the United States.
The Advanced Television Test Center was established in Alexandria, Va., as a neutral test center for evaluation and comparison of proposed HDTV formats. Besides testing the proposed HDTV formats for immunity to electrical interference and other impairments and testing for NTSC compatibility, the proposed HDTV formats are shown to viewers for subjective evaluation. Viewers compare, by psycho-physical testing, the proposed HDTV formats and rate them as to their characteristics with and without transmission impairments. In order to perform testing on all proposed formats, the television test center has a need for a uniform video tape recorder which can record all proposed source formats.
Such a uniform video source may be provided by a video tape recorder capable of recording any one of all proposed HDTV formats and playing back in the recorded HDTV format. Several digital video tape recorders (DVTR), for example, the Sony HDD-1000 and the Hitachi DVTR, are capable of recording or playing back a HDTV signal. Either the Sony or the Hitachi video tape recorder is capable of recording 1920 bytes of luminance data at 74.25 megabytes per second and two chrominance data components comprising another 1920 bytes per line at 74.25 megabytes per second as packets of data. Digital data packets are recorded at a rate of 1035 lines per frame with each frame having 2 fields. The HDD-1000 has a field rate of 60 Hz at which 74.25 megabytes per second are recorded as mentioned above. The HDD-1000 can also be used at a field rate of 59.94 Hz at which 74.175 megabytes per second as recorded. The field rate of 59.94 Hz is actually 60.times.(1000/1001) Hz. While a DVTR is capable of recording and playing back in accordance with the above-described input/output specifications, a requirement remains to provide an
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patent: 5574506 (1996-11-01), Rhodes
patent: 5617218 (1997-04-01), Rhodes
Advanced Television Technology Center
Lee Michael
LandOfFree
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