JPH03106280A - Divided display system - Google Patents

Abstract

PURPOSE:To make it possible to display a highly accurate image by a current television(TV) image receiver by dividing a highly accurate TV type screen so that the number of scanning lines and the number of horizontal samples respectively coincide with the numbers forming the current TV type screen and converting a highly accurate TV signal directly into a current TV signal. CONSTITUTION:In the case of dividing one screen (a) formed by an MUSE signal into plural NTSC screens (b) and displaying the divided screens, the MUSE signal (a) is divided into four right, left, upper, and lower screens and the number of scanning lines and the number of horizontal samples of each divided screen correspond to that of one NTSC type screen. The four divided MUSE signals are directly converted into four NTSC signals and displayed on four NTSC image receivers. Thus, the highly accurate image can be displayed by the NTSC image receiver without executing complex scanning line conversion processing.

Description

[Detailed Description of the Invention] [Field of Industrial Application] This invention divides one screen displayed by a high-definition television signal into a plurality of screens, and transmits the video signal of each divided screen to the current television. This relates to a split display system that converts into signals and displays them. [Prior technology] As a new television system to replace the current television system, this technology not only improves image and sound quality, but also provides a sense of realism that far exceeds that of the current television system. High-definition television systems, such as high-definition systems, have been proposed, which can provide high visual psychological effects such as a sense of force. Furthermore, the MUSE method has been proposed, which compresses the band of high-visitan video signals and enables transmission via broadcasting satellites.

Since the MUSE system is significantly different from the current television system, such as the NTSC system, in its screen system, scanning system, audio system, etc., the MUSE signal cannot be reproduced as is using an NTSC receiver.

Therefore, differences in the number of scanning lines, aspect ratio, horizontal scanning frequency, etc. between both systems are absorbed and the MUSE signal is converted to NTS.
A MUSE/NTSC converter (down converter) for converting into a C signal and displaying the signal has been proposed.

FIG. 4 is a diagram showing an example of displaying the output of the down converter on an NTSC receiver, and shows the effective scanning line 103 of the MUSE signal.
This method reduces the number of lines from 2 lines to 344 lines, one third, and allocates them to 480 effective scanning lines of the NTSC system, thereby obtaining an NTSC image without changing the aspect ratio of 16:9 of the MUSE system. According to this method, since the aspect ratio of the NTSC method is 4:3 (=16:12), a blank area of about 30% of the effective number of scanning lines appears at the top and bottom of the screen, but in the horizontal direction, it is different from the MUSE screen. Match.

However, in this method using a down converter, the MU
Since the number of SE scanning lines is reduced and converted into an NTSC signal, it is not possible to reproduce high-quality images. Therefore, the present applicant has previously proposed a system that can display high-quality images based on the high-definition television system on current television receivers while maintaining their high quality (for example, Japanese Patent Application No. 63-92987 number).

This system divides a high-definition screen into multiple screens, converts the video signal of each divided screen into an NTSC signal, and displays it on a screen made up of multiple NTSC receivers. By using a multi-display projection unit, high-definition images can be displayed on a large screen with sufficient brightness for practical use.

[Problem to be solved by the invention]

However, the above-mentioned system requires complicated processing to convert the number of scanning lines. In other words, in the above-mentioned system, as shown in Figure 5, the high-definition screen is divided into 3 parts vertically and 4 parts horizontally, for a total of 12 parts, and each of these 12 divided screens can be used by one NTSC receiver. I am trying to display it. In this case, the number of horizontal scanning lines on each divided screen is 525, so the vertical direction is
To display on a C receiver, 1575 (=525X3)
Requires a horizontal scanline of the book. Since the number of horizontal scanning lines in high-vision is 1125, in order to increase this to 1575, it is necessary to perform scanning line conversion processing to obtain 7 horizontal scanning lines from 5 horizontal scanning lines.

Therefore, in the conventional method, a complicated circuit structure is required for this scanning line conversion processing, resulting in an increase in the size and cost of the device.

This invention is a method of displaying high-quality images by simple means when dividing 100 screens displayed by high-definition television signals into multiple screens, converting them to current television signals, and displaying them. The purpose is to provide a split display method that is possible.

[Means to solve the problem]

This invention divides one screen displayed by a high-definition television signal into a plurality of screens, and converts the television signal of each divided screen into a current television signal so that a plurality of current televisions can be received. In the split display system displayed on the machine, the conversion of the high-definition television signal that forms the divided screen into the current television signal is performed without reducing the number of scanning lines and horizontal sampling of the high-definition television signal. I will take precautions to do so.

[For production]

In this configuration, for example, in order to divide and display 100 screens formed by the MUSE signal on multiple NTSC screens, the MUSE screen must be divided into four screens (left, right, top and bottom), and the scanning line of each screen must be The screen is divided so that the number and horizontal sampling number correspond to one screen of the NTSC system.

Then, the MUSE signals of the divided 4 screens are transferred to 4
The signal is converted to one NTSC signal and displayed on four NTSC receivers. In this way, a high-definition image can be displayed on an NTSC receiver using simple means without performing complicated scanning line conversion processing.

〔Example〕

FIG. 1 is a block diagram showing an embodiment of the split display method according to the present invention.
An example in which a signal is converted into an NTSC signal and displayed is shown.

In FIG. 1, the MUSE baseband signal received by the BS antenna and obtained through the BS tuner has a cut-off frequency of 8. 1 5 MHz low pass filter (LPF
)1, it is converted into a digital signal by an AD converter 2. The sampling frequency of AD converter 2 is MUS
The resampling frequency of E is 16.2 MHz.

The MUSE signal converted into a digital signal by the AD converter 2 is de-emphasized by the de-emphasis circuit 3,
First to fourth NTSC signal generation units 4a to 4d with the same configuration
is input.

Each of the signal generating units 4a to 4d is a scanning line extracting unit 40.
, a buffer memory 41, an NTSC formatter 42, and a DA converter 43. The scanning line extraction unit 40 is an MU
Extract 480 consecutive scanning lines (the number of effective scanning lines of NTSC) from the 1032 effective scanning lines of the SE signal, and
After interpolating the subsampling specific to the E signal, the luminance signal Y and color difference signals RY and BY of each line are supplied to the buffer memory 41.

The buffer memory 41 is a memory that stores 132 samples of luminance signals and color difference signals that are interpolated consecutively in the horizontal direction from the scanning line extracted by the scanning line extraction unit 40, and is used for signal write timing and readout timing. Since the time difference differs between the MUSE system and the NTSC system, the input signal is written to the storage location specified by the write address signal WA, and the input signal is written to the storage location specified by the successive address signal RA. The signal is read from the stored storage location. The signal read from the buffer memory 41 is synchronized with the NTSC horizontal synchronization signal HD and vertical synchronization signal VD by the NTSC formatter 42, and is supplied as an NTSC video signal to the DA converter 43 and output as an analog signal. Ru. This NTS
The outputs of the C signal generators 4a to 4d are input to NTSC receivers 7a to 7d, which monitor the display 7. AD converter 2
The MUSE signal converted to a digital signal by MUSE
The signal is input to the ξ timing section 5. The MtJSE timing section 5 detects the horizontal synchronization signal and vertical synchronization signal (frame pulse) of the input MUSE signal, generates various timing signals, and outputs various timing signals to the AD converter 2 and the scanning line extraction section 40.
, a buffer memory 41 and an NTSC timing unit 6, which will be described later.

The horizontal synchronization signal of MUSH is inserted into each line of the transmission signal from the 1st sample point to the 11th sample point with the polarity reversed for each line, and from this horizontal synchronization signal 16.2
Regenerate the MHz resampled signal SP1. Also,
The frame pulse is inserted into each frame of the MUSE transmission signal using two lines, and since the waveforms of these two lines have opposite polarities, they can be easily distinguished from the video signal and detected accurately. be able to.

The NTSC timing unit 6 generates various timing signals based on the synchronization signal detected by the MtJSE timing unit 5 and the generated timing signal, and outputs various timing signals to each buffer memory 4l of the NTSC signal generation units 4a to 4d. A continuous address signal RA is supplied to the NTSC formatter 42, horizontal and vertical synchronizing signals HD and VD are supplied to the NTSC formatter 42, and a sampling signal SP is supplied to the DA converter 43.

In this configuration, the NTSC signal generators 4a to 4d convert the input MUSE signals into MUSE images #1 to #4 (
The scanning line signals that form the image shown in FIG. Figure (b)).

That is, in the NTSC signal detection section 4a, the scanning line extraction section 40 extracts from the MUSE signal 480 continuous scanning line signals that form screen #1 at the upper left of the MUSE screen, and the extracted scanning line Number of samples in the horizontal direction of the signal: 37
4, 132 samples at the position where screen #1 is displayed are subjected to interpolation processing and written into the buffer memory 41. The signal written in the buffer memory 4l is read out by the successive address signal RA supplied from the NTSC timing section 6, becomes a signal synchronized with the horizontal and vertical synchronizing signals HD and VD by the NTSC formatter 42, and is converted into an analog signal by the DA converter 43. The signal is converted into a signal and output to the NTSC receiver 7a.

Similarly, the other NTSC signal generators 4b to 4d perform the MU
Scanning line signals representing screens #2 to #4 are extracted from the SE signal, converted to NTSC signals, and transmitted to the NTSC receivers 7b to 7.
Output to d.

Therefore, as shown in FIG. 2, the number of effective scanning lines is 103.
2. The MUSE screen with the number of horizontal samples of 374 is divided into four screens #1 to #4 in the center so that the number of effective scanning lines is 480 and the number of horizontal samples is 132, and each of the divided screens directly transmits the NTSC signal. and displayed on four NTSC screens #1 to #4. As a result, on the display 7, the number of effective scanning lines is 960 and the number of horizontal samples is 264.
The MUSE image is displayed as a high-definition image. In addition, in the above-mentioned embodiment, the MUSE screen is set to 4 in the center.
As shown in Figure 3, the screen is divided into 3 parts horizontally and 2 parts vertically, for a total of 6 parts.
It may be arranged to display six hundred pages #l to #6.

In this case, the total number of pixels in the horizontal direction of the NTSC screen is 396.
(=132×3), which exceeds the number of pixels in the horizontal direction of MUSE, which is 374. For this reason, 11 unnecessary pixels are generated at both the left and right ends of the NTSC screen, but these pixels may be displayed at a black level so that they do not become an eyesore.

〔Effect of the invention〕

According to this invention, l by high-definition television system
When dividing the screen into multiple screens, the screen is divided so that the number of scanning lines and the number of horizontal samplings of the screen to be divided are the same as the number of scanning lines and the number of horizontal samplings that form one screen of the current television system, and the screen is divided into multiple screens. This eliminates the need for complex scanning line conversion processing, making it possible to display high-definition images on current television receivers using simple means.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the split display method according to the present invention, FIG. 2 is a screen layout diagram for explaining the operation of FIG. 1, and FIG. 3 is a screen layout diagram according to another example. , FIG. 4 is an output screen of the down converter, and FIG. 5 is a screen composition diagram for explaining the conventional split display method. 4a to 4d-NTSC signal generation section, 7a to 7d.
...NTSC receiver, 40...scanning line extraction section, 4l.
...Buffer memory, 42...NTSC formatter. Kuu ko ko guha cod f! ji+i Figure 4

Claims (1)

[Claims] One screen displayed by a high-definition television signal,
In the split display method, which divides the screen into multiple screens and converts the television signal of each divided screen into a current television signal and displays it on multiple current television receivers, the height of the screen forming the divided screen is A split display method characterized in that a high-definition television signal is converted to a current television signal without reducing the number of scanning lines and the number of horizontal samplings of the high-definition television signal.