Communications: electrical – Land vehicle alarms or indicators – Internal alarm or indicator responsive to a condition of the...
Patent
1983-04-26
1986-12-23
Brigance, Gerald L.
Communications: electrical
Land vehicle alarms or indicators
Internal alarm or indicator responsive to a condition of the...
340723, 340750, 340799, G09G 128
Patent
active
046315314
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to an image display apparatus which receives an image signal of a television multi-character broadcast or CAPTAIN system and displays an image thereof on a cathode ray tube in which even if the memory that is required to store the image signal has the capacity for plural pages, it is not required to be of high speed in access.
BACKGROUND ART
In a television broadcast, a television multicharacter broadcast has been considered in which various informations such as news, weather forecast, announcement and so on are broadcast by utilizing the vertical blanking period of the television broadcast. As an example thereof, there is proposed a format shown in FIGS. 1 to 3.
The format shown in the figures is a format used by NHK(Nippon Hoso Kyokai), the Japanese broadcast association. As shown in FIG. 1, picture elements of 248 dots form one horizontal line, 204 lines thereof constitute one page and one page forms one picture screen. However, one picture element takes a binary digit of "1" or "0". Further, picture elements of 8 dots.times.12 dots (lines) are called as one sub-block so that one page includes 31.times.17 sub-blocks. And, color is appointed at the unit of one sub-block. Further, the number of pages is selected, for example, about several tens and the data of several ten pages are delivered repeatedly.
The data signal thereof is delivered as a serial digital signal as shown in FIG. 2A during the 20th horizontal period (in case of an odd field period) and the 283rd horizontal period (in case of an even field period) in the vertical blanking period. The data signal of a desired page is delivered at every one page in the following manner.
That is, as shown in FIG. 3A, during the first field period a page control packet PCP is delivered. As shown in FIG. 2B, this packet PCP includes in its header portion of 48 bits a clock run-in CR, a framing code FC and other control signals and in its data portion of 248 bits a page control signal representing to which page this data signal belongs and so on.
During the second field period, delivered is a color code packet CCP. As shown in FIG. 2C, this packet CCP includes in its data portion a row code representing to which sub-blocks of row orders the following 12 packets belong and a color code appointing the color of each sub-block at the unit of one sub-block. In this case, the color code consists of 4 bits per one sub-block and appoints the color of the sub-block.
Further, during the third to 14th field periods, 12 pattern data packets PDP are sequentially delivered. As shown in FIG. 2D, the packets PDP comprise in the data portion thereof picture elements of 1st to 12th lines in 31 sub-blocks of 1 line. For example, the first pattern data packet PDP, which is delivered during the third field period, sequentially includes in its data portion the picture elements in the first lines of the respective sub-blocks of the first line.
Accordingly, by the packets delivered during the second to 14th field periods, all the picture elements of the sub-blocks on the first line of one page and their colors are completed.
Similarly, the sub-blocks of one line are delivered by one color code packet CCP and 12 pattern data packets PDP following thereto.
By this manner, when during the 222nd field period the picture elements on the 12th line of the 17th sub-block are delivered by the packet PDP, the data of one page are thereby delivered.
Accordingly, the data of one page are delivered by one page control packet PCP, 17 color code packets CCP and 204 (=12.times.17) pattern data packets PDP, in which 204 pattern data packets PDP correspond to the picture elements of FIG. 1.
As set forth above, during 222 field periods 222 packets are delivered and hence the data of one page are delivered. When such the operation will be repeated for each of pages as shown in FIG. 3B as well as the data of all the pages will be delivered, the data will be delivered again from the first page.
As described above, the character broadcast signal of the F-mode is
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patent: 4161728 (1979-07-01), Insam
patent: 4191956 (1980-03-01), Groothuis
patent: 4213124 (1980-07-01), Barda et al.
patent: 4290062 (1981-09-01), Marti et al.
patent: 4315257 (1982-02-01), Hernandez
patent: 4323892 (1982-04-01), Kinghorn
Brier Jeffery A.
Brigance Gerald L.
Eslinger Lewis H.
Sinderbrand Alvin
Sony Corporation
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