JPH04167881A - Multi-screen display device - Google Patents

Abstract

PURPOSE:To improve the degree of freedom of display on an NTSC monitor by applying scanning line conversion to a signal, dividing the converted signal into 1/N and applying the result to N-sets of storage means. CONSTITUTION:When a High Vision picture is magnified and displayed on 12 monitors, each write control section 5 generates a window so as to write respectively a data corresponding to positions being 1/12 divisions of the High Vision picture. On the other hand, at read, the picture is controlled by a read control section 6 and reads data from frame memories F1-F3 according to a clock. Then a data from each memory section M1 is D/A-converted at a D/A converter C1 and fed to a relevant display device, in which the picture is displayed with magnification.

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.

However, with this device, the 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. Because it is configured as
There was a drawback that the display position was fixed for each NTSC monitor, making it impossible to cut out and display a portion of the 71-vision image at an arbitrary position.

A conceivable way to overcome these drawbacks is to write A/D converted high-definition data into 12 memories and then perform scanning line conversion.

However, in the above system, since the scanning line converting means is disposed after the memory, the same number of scanning line converting means as the memory is required, making it expensive.

(c) Problems to be Solved by the Invention The present invention has been devised in view of the above points, and it is an object of the present invention to improve the degree of freedom in displaying high-definition images on an NTSC monitor, and to construct a circuit at low cost. The present invention provides a multi-screen display device that can display multiple screens.

(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 converting means for A/D converting a high-definition video signal; scanning line converting means for converting the number of scanning lines of the output of the A/D converting means; N storage means each storing data corresponding to N different parts of one screen of the screen; means for controlling writing and reading of the storage means; and means for D/A converting the output of the scanning line conversion means. A multi-screen display device comprising: D/A conversion means;

(E) Function The present invention performs scanning line conversion on a high-definition A/D-converted video signal, and then divides the signal into N parts and supplies them to N storage means, so that any high-definition image can be displayed on an NTSC monitor. It will be projected.

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

First, FIG. 3 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. 4 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. 5 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
The information can be displayed on two NTSC system displays D1 to D12.

On the other hand, to display one image on the entire screen, 525
Since X3=1575 scanning lines are required and the high-definition system has 1125 scanning lines, it is necessary to convert the number of scanning lines from 5 to 7.

In addition, the field frequency is 60Hz for high-definition systems.
Since the NTSC system is 59.94 Hz, field frequency conversion is required.

FIG. 1 shows a block diagram of the device of this embodiment. In the figure, 1 is an A/D converter that converts a high-definition video signal into A/D using a 59.4 MHz clock, and 2 is an A/D converter that converts a high-definition video signal into a digital signal using a 59.4 MHz clock. It is a vertical filter for converting data from 5 scanning lines to 7 scanning lines, and is composed of a well-known digital filter.

M1 to M12 are one of the screens of the high-definition system.
12 memory sections, 01 to 01, each storing three frames of A/D converted data corresponding to two different parts, and performing time axis expansion and field frequency conversion from the high-definition rate to the NTSC rate. C12 is a D/A converter that performs D/A conversion of this memory section output.

FIG. 2 is a detailed diagram of the memory section M1 and its peripheral circuits, and the operation of the above-mentioned circuit will be explained with reference to this figure.

First, a high-definition video signal is input to an A/D converter, and a synchronization signal is separated by a synchronization separation circuit 3 and supplied to a clock generation circuit 4. This clock generation circuit has a frequency of 59°4MHz synchronized with the previous synchronization signal and a frequency of 83.4MHz, which is 715 times this frequency. ], generates a 6MHz clock. After A/D conversion is performed at 59.4 MHz, the vertical filter 2 converts the scanning lines from five to seven.

Therefore, the output of this vertical filter is a video signal having 1575 scanning lines.

Next, this signal is divided into 12 systems and each memory section M1 to
It is supplied to M12. Each memory section is composed of three frame memories F1 to F3, a write control section 5, a read control section 6, changeover switches S1 and S2, and a memory changeover circuit 7.

First, the changeover switch S1 is changed over every frame by a control signal from the memory changeover circuit 7.

Therefore, the vertical filter output is sequentially F1 to F1 in frame units.
Written to F3.

The write control unit 5 generates a window for selecting any one of the video signals obtained by dividing the input high-definition image into 12 based on the aonZ synchronization signal from the synchronization separation circuit 3 and the 83.16MHz clock. do. For example, when a high-definition image is enlarged as it is and displayed on 12 monitors, each write control section 5 generates a window so as to write only data corresponding to the positions where the high-definition image is divided into 12. Then, data selected according to this window is sequentially written into the selected frame memory.

Note that joint adjustment can be easily performed by adjusting the position of the window.

On the other hand, the readout is controlled by the readout control section 6.

This read control unit 6 reads the frame memory F1 according to horizontal and vertical synchronizing signals separated by a synchronization separation circuit 8 from an externally inputted NTSC synchronization signal, and a 7MHz clock generated by a tarlock generation circuit 9 and locked to the synchronization signal. ~Read data from F3. Further, switching of the frame memory to be read is performed by controlling the changeover switch S2 using a control signal from the memory switching circuit 7 so that reading and writing to the same memory are not performed at the same time.

By writing and reading from the frame memories F1 to F3, the time axis is expanded to an NTSC signal.

Also, at the same time from 60 Hz to 59. The field frequency is converted to 944■y. That is, the written data is read out once every 33 seconds while skipping data for one frame. Note that this data skipping can be done unnoticeably by selecting the timing of still images while detecting the movement of the video signal.

The data from each of the memory units M1 to M12 is A/D converted by D/A converters C1 to C12, respectively, and supplied to the corresponding display devices D1 to D12.

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

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

(G) Effects of the Invention As described above, according to the present invention, in a multi-screen display device that displays a No. 1 vision video signal using N NTSC system displays, the NTSC
The degree of freedom of display on a monitor can be improved, and a circuit can be configured at low cost.

[Brief explanation of drawings]

Fig. 1 is a block diagram of a multi-screen display device according to an embodiment of the present invention, Fig. 2 is a detailed diagram of the memory section and its peripheral circuits, Fig. 3 is an explanatory diagram of the NTSC system, and Fig. 4 is an explanatory diagram of the high-definition system. The explanatory diagram, FIG. 5, is an explanatory diagram of the display device in this embodiment. l... A/D converter 2... Vertical filters M1-M12... Memory section 5... Write control section 6... Read control section 01-CI2... D/A converter D1- D12...Indicator

Claims (2)

[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.
In a multi-screen display device for display using multiple screens, an A/D converting means for A/D converting a high-definition video signal; a scanning line converting means for converting the number of scanning lines of the output of the A/D converting means; N storage means each storing data corresponding to N different portions of one screen of the high-definition system out of the output of the scanning line conversion means; and means for controlling writing and reading of the storage means; A multi-screen display device comprising: D/A converting means for D/A converting the output of the scanning line converting means. (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.