JPH04138784A - Multiscreen display device - Google Patents

Abstract

PURPOSE:To maintain the high definition of a high-vision and to improve the stability of a circuit by performing the internal processing of a storage means and a vertical filter at a low speed while N-dividing an A/D converted video signal with high definition system to be supplied to N number of storage means and vertical filters. CONSTITUTION:A high definition video signal is parallely supplied to an A/D converter 1 in the state of R, G, B primary color signals to be converted into digital data, divided into twelve respectively to be supplied to memories M1 to M12. Each memory writes the only data corresponding to the position where the high definition picture is divided into twelve by a clock with 59.4 MHz from a writing control part 2. At the time of reading, by reading it out with a clock of 7.2MHz from a reading control part 3, the time axis extension its performed on an NTSC signal. Then, the output for respective memories M1 to M12 is supplied to scanning line conversion means F1 to F12 to be converted from 1125 to 1575.

Description

DETAILED DESCRIPTION OF THE INVENTION (A) Field of Industrial Application The present invention relates to a multi-screen display device that displays high-definition video signals using N NTSC display devices.

(B) Conventional technology Conventionally, as a multi-screen display device that displays a high-definition video signal with an aspect ratio of 16:9 using N NTSC system display devices with an aspect ratio of 4:3, the
There is one shown in Japanese Patent No.-264482. According to this device, a high-definition video signal is vertically divided into three parts, stored in memory, passed through a vertical filter, and then horizontally divided into four parts to display high-definition images on 12 NTSC monitors. can.

However, the conventional device described above has the disadvantage that the memory and vertical filter must be operated at a high speed of 11 MHz or higher, resulting in a lack of stability in circuit operation.

(c) Problems to be Solved by the Invention The present invention has been devised in view of the above-mentioned points, and it is possible to maintain high definition of high-definition even if the internal processing speed of the memory and vertical filter is slowed down, and the stability of the circuit is improved. The present invention provides a multi-screen display device with improved performance.

(d) Means for Solving the Problems The present invention provides a multi-screen display device that displays a high-definition video signal with an aspect ratio of 16:9 using N NTSC system displays with an aspect ratio of 4:3. A/D conversion means for A/D converting a high-definition video signal; and N storage means for respectively storing A/D-converted data corresponding to N different portions of one screen of the high-definition system. and means for controlling writing and reading of the storage means; scanning line conversion means for converting the number of scanning lines of the output of the storage means; and D/A conversion for converting the output of the scanning line conversion means from D/A. A multi-screen display device comprising: means;

(e) Function The present invention divides a high-definition A/D-converted video signal into N parts and supplies them to N storage means and vertical filters, thereby allowing the internal processing of the storage means and vertical filters to be performed at low speed.

(f) Example An embodiment of the present invention will be described below with reference to the drawings.

First, FIG. 2 schematically shows an NTSC TV screen, and the aspect ratio of the screen is 4:3.1, and the number of scanning lines in a frame is 525. Further, FIG. 3 schematically shows a high-definition TV screen, and the aspect ratio of the screen is 16:9.1, and the number of scanning lines in a frame is 1125.

Next, FIG. 4 shows the screen configuration in this embodiment,
4 NTSC displays horizontally and 3 vertically
A total of 12 pieces are arranged to form one screen. The overall aspect ratio is 16:9, which matches the aspect ratio of the high-definition system. Therefore, with this screen configuration, one high-definition video signal can be
It is possible to display on the NTSC system display BDI-D12.

On the other hand, to display one image on the entire screen, 525
X3 = 1575 scanning lines are required, and since the scanning lines of the HDTV system are 1125, it is necessary to convert the number of scanning lines from 5 to 7.Furthermore, the field frequency is 60Hz for the HDTV system and 60Hz for the NTSC system. 59.94
Hz, field frequency conversion is required.

FIG. 1 shows a block diagram of the apparatus of this embodiment. In the figure, 1 is an A/D converter that converts a high-definition video signal into a digital signal at 59.4 MHz, and M1 to M12 are the high-definition video signals. There are 12 memories each storing 3 frames of A/D converted data corresponding to 12 different parts of one screen, and 2 is a 59.4 MHz clock that sequentially stores specific data in each memory. A write control unit 3 controls writing, a read control unit 3 reads data from each memory using a 7.2 MHz clock, and controls inserting two dummy data into five scanning lines; F1 to F12 indicate scanning line conversion means for converting the scanning lines of each memory output from 5 to 7; 01 to C;
12 is a D/A converting the output of this scanning line converting means;
It is a converter.

Next, the operation of the above circuit will be explained.

First, the high-definition video signal is supplied in parallel to the A/D converter 1 in the state of R, G, and B primary color signals, and after being converted into digital data, each is divided into 12 parts and stored in memories M1 to M1.
2. Each memory has 5
12 high-definition images by 9.4MHz tarotsu
Write only the data corresponding to the divided position.

When reading, the NTSC signal is subjected to time axis expansion by reading using a 7.2 MHz clock from the read control unit 3. Also, at this time, dummy data for two lines (○ data) is inserted and output for every memory output for five scanning lines.

Also, by writing and reading this memory, 60H
z to 59°94 Hz. That is, the written data is read out once every 33 seconds while discarding one frame's worth of data.

Next, the outputs of the memories M1 to M12 are respectively supplied to scanning line converting means Fl-F12 and converted from 1125 lines to 1575 lines.

FIG. 5 shows a specific example of the scanning line conversion means.

The R, G, B parallel data is first converted into serial data by a parallel-to-serial converter 4, and then supplied to a vertical filter 5. This vertical filter is a well-known digital filter composed of six IH delays @H1 to H6, seven coefficient multipliers 1 to 7, and an adder ADD, and detailed explanation thereof will be omitted. The data interpolated by this vertical filter is sent to the serial/parallel converter 6 for R, G
, B is converted into parallel data. Note that this vertical filter is also processed at a rate of 7.2 MHz.

The parallel data from each scanning line conversion means Fl-F12 is A/D converted by D/A converters C1-C12, respectively, and supplied to the corresponding display devices D1-D12.

As a result, the high-definition image is enlarged and displayed on 12 N TSC displays.

In addition, although the number of displays was 12 in this embodiment, 6, 2
It may be 4 pieces, 48 pieces, etc.

Effects of the Invention As described above, according to the present invention, in a multi-screen display device that displays a high-definition video signal using N NTSC display devices, the internal processing speed of the memory and vertical filter can be slowed down. Therefore, the stability of the circuit can be improved.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of a multi-screen display device according to an embodiment of the present invention, Fig. 2 is an explanatory diagram of the NTSC system, Fig. 3 is an explanatory diagram of the high-definition system, and Fig. 4 is a diagram of the display device in this embodiment. The explanatory diagram, FIG. 5, is a block diagram of the scanning line conversion means. l... A/D converter 2... Write control section 3... Read control section Ml-Ml2... Memories F1 to F12... Scanning line conversion means C1 to CI2... D/A conversion Device DI-DI2...Display device

Claims (3)

[Claims] (1) Connect a high-definition video signal with an aspect ratio of 16:9 to an NTSC display with an aspect ratio of 4:3.
A/D conversion means for A/D converting a high-definition video signal, and A/D conversion corresponding to N different parts of one screen of the high-definition system. N storage means for respectively storing stored data; means for controlling writing and reading of the storage means; scanning line conversion means for converting the number of scanning lines of the output of the storage means; and output of the scanning line conversion means. A multi-screen display device comprising: D/A converting means for D/A converting. (2) The multi-screen display according to claim 1, wherein the storage means converts the frequency from the field frequency of the high-definition system to the field frequency of the NTSC system by performing writing at the timing of the high-definition system and reading at the timing of the NTSC system. Device. (3) The scanning line conversion means includes a parallel-to-serial converter that converts each R, G, and B parallel data string into a serial data string, a vertical filter that receives the serial data string as input, and an R 2. The multi-screen display device according to claim 1, further comprising a serial-to-parallel converter for converting the data into parallel data strings of , G, and B.