Television – Basic receiver with additional function – Multimode
Patent
1998-02-03
2000-11-21
Black, Thomas G.
Television
Basic receiver with additional function
Multimode
348465, 348554, H04N 546, H04N 327
Patent
active
061510785
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a method of transmitting video data, a video data transmitting apparatus, and a video data reproducing apparatus. More particularly, it relates to a method of transmitting video data, a video data transmitting apparatus, and a video data reproducing apparatus for identifying pieces of video data whose video reproduction modes are different to reproduce the same.
BACKGROUND ART
For television broadcasting, it is essential that videos, i.e., moving pictures are converted into television signals and transmitted, and a receiver receives these signals and performs reproduction processing to obtain the moving pictures and display them. In the case of sound signal which allows to treat a relation between time and sound pressure as one-dimensional one, instantaneous sound pressures (during a short time period) can be directly converted into electric signals. On the other hand, in the case of moving picture, if it is partitioned into still pictures at short time intervals, each still picture is planar, that is, two-dimensional information and therefore it is necessary to, prior to the conversion into signals, make their planes one-dimensional by scanning, so that the plane can be treated as a plurality of scan lines. Scan methods for obtaining a plurality of scan lines from pictures includes non-interlace scanning and interlaced scanning. Non-interlace scanning is a method in which all of the scan lines on a frame (a screen) are sequentially scanned from top to bottom to display a video image, and interlaced scanning is a method in which every other scan line is scanned.
When the display performance of a display device is not so high, non-interlace scanning causes flicker on screen due to the increase of the time difference between the top and the bottom of the scanning. Therefore, interlaced scanning is mainly employed in the conventional television broadcasting. In the NTSC system which is known as a common television system, assuming that one frame (screen) consists of 525 scan lines, two kinds of scanning, scanning for odd lines and scanning for even lines are performed, which means that two fields are scanned.
If the display device has a high display performance, however, the flicker on screen can be reduced by means of non-interlace scanning. Generally, a number of display times per second for a non-interlace scanning type computer display is approximately a double of the number of display times per second for an interlace scanning type one. Therefore, non-interlace scanning has captured much of the spotlight in the field of high-definition television or the like because it enables superior picture quality and high affinity for CG (computer graphics) or the like.
On the other hand, when moving pictures are digitized to be recorded and transmitted or received as digital data, the digitized data is generally treated as compressed code. As standardized moving picture compression technique, most common is MPEG (Moving Picture Experts Group), which is described in Latest Manual of MPEG (Ascii Co., Ltd, First Edition, published on Aug. 1, 1994) and Practical Manual of MPEG (Ascii Co., Ltd, First Edition, Published by (Nov. 1, 1995). These books also refer to the well-known transmission and reception methods for video data and video data reproducing apparatuses on the basis of MPEG standard.
In the prior art, techniques for transmitting and receiving video data based on MPEG standard have been established on the assumption that video data based on interlaced scanning is exclusively used because interlaced scanning is common in television broadcasting as described above. On the other hand, in the case of using videos based on non-interlace scanning, developments and the like have been developed on the assumption that video data subjected to non-interlace scanning is exclusively used.
The following description is on the conventional transmission and reception of video data using video image subjected to interlaced scanning which is common in television broadcasting
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Masuda Yasuo
Yoneda Yasushi
Black Thomas G.
Le Uyen
Matsushita Electric - Industrial Co., Ltd.
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