JPH0683419B2 - Television signal receiver - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a television signal receiving apparatus for displaying one screen on a screen composed of a plurality of display devices.

[Outline of Invention]

In the present invention, the vertical synchronization signal delay amount of the display device arranged such that n units in the horizontal direction and m units in the vertical direction, that is, a total of n × m units constitutes one screen, is maximum H / H in the horizontal direction. n,
Adjustable vertically in the range of maximum V / m.

[Conventional technology]

The current television broadcasting standard in Japan is the NTSC system. On the other hand, in order to obtain higher quality images, it has been proposed to change the broadcasting system to the high definition system.

Since HDTV TV signals are different from NTSC TV signals, conventional NTSC TV receivers cannot receive them as they are.

Therefore, it has been proposed to convert a high-definition TV signal into an NTSC TV signal and receive the signal with an NTSC TV receiver.

However, such a conventional proposal is a high-definition TV
Since the signal is received by a single TV receiver of the NTSC system, there is a drawback that only an image of the quality in the NTSC system can be obtained. Therefore, although the source is a high-definition system, its merit is not fully utilized and a high-quality image cannot be viewed.

Therefore, it was arranged so that multiple screens would form one screen.
It is conceivable to divide the high-definition TV signal and display it on a display such as an NTSC CRT.

[Problems to be Solved by the Invention]

When one image is divided and displayed on multiple CRTs, the timings of the horizontal and vertical sync signals of each CRT are conventionally matched, so when the image changes quickly, the image of the image is changed at the boundary of each CRT. There were times when there was a discontinuity, such as the time relationship being reversed.

For example, an image in which a large object S is moving from top to bottom as shown in FIG. 6 (a) is divided and displayed on four screens 11, 12, 21, 22 as shown in FIG. 6 (b). Think about when.
At this time, considering the scanning order of the TV, the scanning lines descend from the upper left to the lower right at the same time on each screen. Therefore, in the situation shown in the figure, the upper half of the object S is displayed on the screens 11 and 12. Before being displayed, the lower half of the object S will be displayed first on the screens 21 and 22. The timing relationship at this time is as shown in FIG. That is, the timing signals in FIG. 6 (a) are as shown in FIG. 7 (a), but the timing signals of, for example, screens 11 and 21 of the four screens are shown in FIGS. 7 (b) and (c). Like That is, the graphics to be displayed continuously have a time shift (reversal) of maximum T (seconds). In other words, the object divided at the boundary always moves the lower object first. This is a basic contradiction when the scanning system is converted, and it is difficult to take complete measures. In other words, the upper and lower screens are simultaneously scanned, but originally only one scanning line can exist,
There will always be a temporal overlap.

For example, in a case where a predetermined image is displayed in a large size for demonstration at an exhibition or the like, it is not preferable that such a phenomenon is noticeable. Also, as the number of screen divisions increases, the problems during that time increase and countermeasures are required.

Therefore, the present invention is to make the discontinuity in the boundary portion inconspicuous corresponding to the image to be displayed.

[Means for Solving the Problems]

The television signal receiving apparatus of the present invention comprises a memory for storing at least one field of TV signals and n in the horizontal direction.
(N ≧ 2) units, m in the vertical direction (m ≧ 2) units, total (n ×
m) A display arranged so that the bases form one screen and dividing and displaying a TV signal for at least one field stored in the memory, and a horizontal scanning period is H and a vertical scanning period is V. At this time, the delay amount of the vertical synchronization signal of each display from the vertical synchronization signal of the display arranged on the left side is set and changed in the range of 0 to the maximum H / n,
Set the amount of delay of the vertical sync signal of each display from the vertical sync signal of the display placed above it to a maximum of V / m.
And adjusting means for setting and changing the range.

[Action]

For example, a total of 12 NTSC CRTs are arranged in a row and three in a row to form one screen. The number of horizontal scanning lines is increased by generating seven NTSC horizontal scanning lines from five high definition horizontal scanning lines. The increased horizontal scanning line is divided into 3 for each number of NTSC systems, and further divided into 4 in the scanning direction and supplied to each CRT.

The vertical sync signal of each CRT can be delayed by a predetermined amount with respect to the vertical sync signals of its left and upper CRTs.

Therefore, it becomes possible to adjust the discontinuity at the boundary of each CRT so as not to be conspicuous according to the image to be displayed.

〔Example〕

FIG. 1 is a block diagram of a television signal receiving apparatus of the present invention. In the figure, reference numeral 1 denotes a high-definition type TV camera, which outputs a high-definition type television (TV) signal. Of course, the TV camera 1 can be replaced with a high-definition type television tuner.

An A / D converter 2 performs A / D conversion on the input TV signal. A frame memory 3 stores the A / D converted TV signal for one frame. Reference numeral 4 is a vertical filter composed of a coefficient switching type FIR filter or the like, which converts 1125 scanning lines into 1575 scanning lines by a series of processing such as 7875 oversampling, O insertion, interpolation, and thinning. Reference numeral 5 is an NTSC CRT arranged as described above. Reference numeral 6 denotes an adjusting means, which is operated when adjusting the delay amount of the vertical synchronizing signal of the CRT 5.

FIG. 3 schematically shows a high-definition TV screen. With this method, the aspect ratio of the screen is 16: 9,
The number of horizontal scanning lines in one frame is 1125. The number of horizontal scanning lines on the effective screen is about 1035 lines, which is about 92%. Also, in the case of digitally processing an image, 1
When the number of horizontal scanning lines of a book is set to 1440, the number of samplings of the effective screen portion is about 82.5%, which is about 1188.

FIG. 2 schematically shows an NTSC TV screen. In this system, the aspect ratio of the screen is set to 4: 3, and the number of horizontal scanning lines in one frame is 525. Of these, the number of horizontal scanning lines of the effective screen appearing on the actual screen is about 48%, which is about 92%. In the case of digitally processing an image, the number of samplings of one horizontal scanning line is 360, which is 1/4 of the number of samplings of high-definition. Moreover, the sampling number of the effective screen portion is about 297, which is about 82.5%.

FIG. 4 shows the structure of the screen in the present invention. In the present invention, CRTs 11 to 1 as the display of the NTSC system
4, 21 to 24, 31 to 34 are arranged in a horizontal direction, four in a horizontal direction, and three in a vertical direction, so that a total of 12 are arranged to form one screen. each
Since the CRT is set to an aspect ratio of 4: 3 corresponding to the NTSC system, if the CRTs are arranged in this way, the aspect ratio of the screen composed of 12 CRTs becomes 16: 9, and the HDTV system It can be a screen that matches the aspect ratio of.

Then, the high-definition TV signal output from the TV camera 1 is A / D converted by the A / D converter 2. The frame memory 3 stores a digitized TV signal for one frame.

The number of horizontal scanning lines of the image stored in the frame memory 3 is
It is 1125. However, each CRT has 5 horizontal scan lines.
Since there are 255 lines, 1575 (= 525 × 3) horizontal scanning lines are required to display one image on the entire screen. Since the number of horizontal scanning lines for HDTV is 1125, it is necessary to increase this to 1575. Since the least common multiple of both is 7875, it is sufficient to increase the number by generating 7 NTSC horizontal scanning lines from 5 high definition horizontal scanning lines. As described above, the vertical filter 4 converts the horizontal scanning line.

The first 525 of the 1575 horizontal scanning lines generated in this way are supplied to the upper four CRTs 11 to 14, and the next 52
Five in the middle CRT21 to 24, the last 525 in the lower CRT31
To 34 respectively. This allows each CRT to run on a regular NTS
As in the case of the C method, 525 horizontal scanning lines are used for scanning.

However, since four CRTs are arranged in the horizontal direction, the horizontal scanning line is divided into four in the horizontal direction, and each CRT 11 to 14 (21 to 2
The same applies to 4,31 to 34), 1/4 of the original length signal is sequentially supplied.

In this way, one image can be displayed by 12 CRTs.

However, if each CRT is driven by the in-phase vertical synchronization signal as described above, the image may become discontinuous at the boundary of each CRT when the moving image changes rapidly. Therefore, by operating the adjusting means 6, the phase of the vertical synchronizing signal of each CRT is changed.

When the adjusting means 6 is operated, the vertical synchronizing signal of each CRT is changed and adjusted as shown in FIG. That is, in each stage (horizontal arrangement), the vertical synchronizing signal of the CRT is delayed by the time t from the vertical synchronizing signal of the CRT on the left side thereof. The horizontal scanning period is H, and the number of CRTs arranged in the horizontal direction is n.
When (n = 4 in the case of the embodiment), the delay time t is set to a predetermined value in the range of 0 to H / n.

Further, in each column (arrangement in the vertical direction), the vertical synchronizing signal of the CRT is delayed by the time T from the vertical synchronizing signal of the upper CRT. When the vertical scanning period is V and the number of CRTs arranged in the vertical direction is m (m = 3 in the embodiment),
The delay time T is set to a predetermined value in the range of 0 to V / m.

The optimum setting value of this delay time varies depending on the movement of the screen. Basically, there is no problem at any timing when there is no movement. However, when a movement occurs, a time contradiction always occurs.

For example, when the entire screen is switched instantaneously (in one frame), the delay amount is preferably 0.

On the other hand, when a small object is moving in the vertical direction, there is a delay of one field between the upper and lower screens, which is preferable in terms of continuity of movement. However, if such a setting is made, adverse effects occur in other cases.

Therefore, as a most appropriate method when considering the distribution of the entire screen, it is conceivable to match the operation start time of each screen with the timing of the original signal.

That is, the basic contradiction can be minimized by matching the scanning start timing of each screen to be divided and displayed with the scanning timing of the original signal.

Of course, it is also possible to adjust the delay time to be optimal depending on the video content to be emphasized by providing the adjusting means.

〔The invention's effect〕

As described above, according to the present invention, a plurality of display devices are arranged in the horizontal direction and the vertical direction to form one screen, one image is divided and displayed on each display device, and the vertical synchronization of each display device is performed. Since the signal delay amount can be changed and adjusted, the discontinuity at the boundary of each display can be made inconspicuous.

[Brief description of drawings]

FIG. 1 is a block diagram of a television signal receiving apparatus of the present invention, FIG. 2 is an explanatory diagram of an NTSC system, FIG. 3 is an explanatory diagram of a high-definition system, and FIG. 4 is an explanatory diagram of a display device of the present invention. 5
FIG. 7 is a timing chart of the apparatus of FIG. 1, FIG. 6 is an explanatory diagram of a conventional conversion system, and FIG. 7 is a timing chart of the system of FIG. 1 …… TV camera 2 …… A / D converter 3 …… Frame memory 4 …… Vertical filter 5 …… CRT 6 …… Adjustment means

Claims (1)

[Claims] 1. A memory for storing at least one field of TV signals, and n (n ≧ 2) units in the horizontal direction and m (m ≧ 2) in the vertical direction.
Units, a total of (n × m) units are arranged to form one screen, and a display unit for dividing and displaying at least one field of TV signals stored in the memory, and a horizontal scanning period of H and vertical When the scanning period is V, the delay amount of the vertical synchronizing signal of each display from the vertical synchronizing signal of the display arranged on the left side thereof is from 0 to the maximum H / n.
In addition to setting and changing in the range of, the amount of delay of the vertical sync signal of each display from the vertical sync signal of the display placed above it is set and changed in the range of 0 to maximum V / m. A television signal receiving apparatus comprising: adjusting means.