JPH0265575A - Display system for plural patterns of video reproducing device and video reproducing device displaying plural patterns - Google Patents

Abstract

PURPOSE:To effectively utilize a screen by splitting a high definition TV screen into one split screen whose aspect ratio is 12:9 and 3 split screens whose aspect ratio is 4:3, reproducing a master screen normal video signal on the former screen and reproducing 3 kinds of slave screen normal video signals from the latter three split screens. CONSTITUTION:The high definition television screen whose aspect ratio is 16:9 is split into one large screen size having an aspect ratio of 12:9 and three small screen sizes having an aspect ratio of 4:3 in total four. A master screen processing circuit 1 uses an A/D converter 4 to convert a master screen normal video signal (e) into a digital signal and stores the result in a master screen memory 5. Each slave screen processing circuit 2 converts a slave screen normal video signal (f) into a digital signal by an A/D converter 12 and stores it into a slave screen memory 13. A master screen normal video signal read from the master screen memory 5 at a readout clock frequency fco is in OR combination with the slave screen normal video signal and converted into an analog signal again by the D/A converter 11 and the result is fed to a cathode ray tube HDTV as a video output signal.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a picture playback device (picture out) that simultaneously projects a reduced child screen of t9 on the outside of a main screen projected on the screen of a single video playback device. Picture
.

(hereinafter abbreviated as POP), especially the Fnn double-screen display method and multi-screen display video playback of video playback equipment when digitizing and playing back the video signal of a video playback device with a small aspect ratio to a video playback device with a large aspect ratio. Regarding equipment.

[Prior art] Recently, high-definition televisions (for example, HD TVs), which have better image quality than the current NTSC television receivers (hereinafter referred to as regular TVs), are becoming a big hit in Japan and other countries as they are about to be put into practical use. There are expectations. l(D T V
The main features are that the number of scanning lines is 1125 and the aspect ratio is 16:9. this)IDTV
Since the number of scanning lines and aspect ratio of the HDTV are different from the 525 scanning lines and the aspect ratio of 4:3 of a normal TV, the two are not compatible, and therefore, only dedicated software can be used with the HDTV.

However, it would be very desirable if the HDTV could reproduce normal TV video signals.

In this respect, if digital technology is used, it is possible to reproduce normal TV signals on an HD TV.

However, if the image is reproduced as is, there are disadvantages in that margins may appear on the screen or the Hilt relationship on the screen may be incorrect because the number of scanning lines and aspect ratio are different.

To resolve this inconvenience, it may be possible to display multiple screens on the HDTV screen by embedding the entire child screen in the margin screen or modifying the vertical and horizontal relationship of the screen. Therefore, the conventional multiple screen display method poses a problem.

2. Description of the Related Art Conventionally, there has been a multi-screen display system for video reproduction equipment, mainly TVs for consumer use, as shown in FIG.

First, on the current NTSC screen (hereinafter referred to as normal screen) with an aspect ratio of 4:3, a part of the image is cut out,
Insert a child screen into it PIPC Picture in
(Figure 4 (a))
, for example, Japanese Patent Publication No. 62-30552, Japanese Patent Publication No. 62-30552,
It is publicly known from Publication No. 30553 and the like.

Next, 4 screens (
(Figure 4 (B))), multi-screen TVs that are similarly reduced to 9 screens (Figure 4 (C)), or 16 screens, and furthermore, two-screen TVs that divide the normal screen into two vertically to create a vertically long screen. FIG. 4(d)) is also already known.

However, these methods have the following drawbacks. In the PIP shown in FIG. 4(a), the child screen is inserted into the main screen, so that part of the content of the main screen is damaged and cannot be viewed. In the multi-screen TV shown in FIGS. 4(b) and 4(c), in which the normal screen is similarly reduced, there is no distinction between the main screen and the child screen, and both screens are reduced, making it difficult to view. Furthermore, in the vertically divided vertically elongated screen shown in FIG. 4(d), the image becomes vertically elongated, resulting in a significant loss of image quality.

Moreover, the conventional example is limited to the case where a normal video signal is reproduced on a normal TV.

[Problems to be Solved by the Invention] As mentioned above, when normal TV signals are reproduced as they are using digital technology on an HD 77 screen with an aspect ratio of 16:9, blank spaces may appear on the screen, and the M-horizontal relationship of the screen may be distorted. There is an inconvenience that something goes wrong. However, even if a conventionally known multi-screen display method is adopted to solve this inconvenience, it is not only impossible to fill the screen margins due to unique problems such as different aspect ratios, but also the screen It is also not possible to correct the vertical/horizontal relationship.

It is an object of the present invention to transmit regular TV signals onto a high-definition TV screen.
By inserting 19 or more reduced sub-screens that maintain the aspect ratio of a normal television signal into the blank space that occurs when a T-video signal is displayed, the above-mentioned drawbacks of the conventional technology can be overcome and the screen can be used effectively. Another object of the present invention is to provide a multi-screen display method for a video playback device and a multi-screen display video playback device that allows viewing of child screens at the same time without impairing the content or image quality of the main screen.

[Means for Solving the Problems] The video playback device of the present invention has a tq number double screen display system, and an aspect ratio of 4 is displayed on the screen of a high-definition TV with an aspect ratio of 16:9.
In the multiple image display method of a video playback device that displays multiple images of a normal television signal of 3:3, the main screen of a normal television signal that maintains the aspect ratio of the normal television signal with an aspect ratio of 12:9 is displayed in high quality. Playback is left-aligned or right-aligned on the TV screen, and this playback creates an aspect ratio of 4:9 on the right or left side of the high-definition TV screen.
In the margin, the aspect ratio of the normal television signal is 4.3.
The sub-screens, each of which holds a sub-screen, are played in three vertical columns.

Furthermore, the multi-screen display video playback device of the present invention includes a main screen memory that stores a main screen normal video signal, and a sub screen that stores three types of sub screen normal video signals and whose output is OR-connected with the main screen memory. Memory, 525 main screen normal video signals are stored in the above main screen memory, 525 sub screen normal video signals are thinned out to 2/3 and 350 sub screen normal video signals are stored in each of the above sub screen memories. A write control means for writing each, and its 12/16 during one line period.
During the period, one line of video signals is compressed and read from the main screen memory, and during the 6th period, one line of video signals is compressed and read from the child screen memory. During the l field period, 525 video signals are read from the main screen memory, of which 175 are compressed. The sub-screen memories that store the above three types of signals are sequentially switched every minute, and 175 video signals are read from each switched sub-screen memory, and during the 2-field period, they are read from the main screen memory during the 1-field period. readout control means that reads out the remaining 525 videos again and sequentially switches and reads out the remaining 175 videos from each child screen memory,
The four normal video signals read from each memory are time-divisionally synthesized under the control of this readout control means, and the main screen and the sub-screens reduced to three vertical columns outside the main screen are combined into multiple images that fit the high-quality TV screen size. It is designed to be played back.

[Effect] The screen size of a high-definition TV with an aspect ratio of 16:9 can be divided into one large screen size with an aspect ratio of 12:9 and three small screen sizes with an aspect ratio of 4:3. It can be neatly divided into a total of four screens. The aspect ratio of 12:9 is exactly the same as the aspect ratio of 4:3, which is the aspect ratio of normal television signals. That is, on a divided screen of a high-quality television signal with an aspect ratio of 16:9, a plurality of programs of normal TV video signals can be played back to fit the size of the divided screen.

The present invention was made based on this knowledge, and 52
Five main screen normal video signals are written into the main screen storage means under the control of the write control means. The written 525 main screen normal video signals are read out under the control of the readout control means. As a result, the display brightness [1i] of one line of the video signal is time-compressed by 16/12 times, and the same video signal is read out twice by interlacing, so the total number of scanning lines is 10.
The number of lines is 50, which is approximately equal to the number of scanning lines of a high-definition television signal. Therefore, when the video signal output from the main screen memory is played back on a high-definition TV, the playback screen matches the split screen size with an aspect ratio of 12:9.

On the other hand, the 525 sub-screen normal video signals are subtracted by 2/3 by 11r1 by the write control means, resulting in 350 signals, and are written into the sub-screen storage means. The written 350 sub-screen normal video signals are read out under the control of the readout control means. With this, the display period of the video signal is 1
350 video signals compressed in time axis by 6/4 times will be output from the child screen memory. Therefore, when this video signal is played back on a high-definition TV, the playback screen matches the split screen size with an aspect ratio of 4:3.

There are three types of sub-screen normal video signals played on a high-definition TV, so these three types of video signals can fill three parts of the split screen size with an aspect ratio of 4:3 on a high-definition TV screen. Become.

In this way, under the control of the readout control means, the four normal video signals output from each memory are time-divisionally synthesized, and the divided screen with an aspect ratio of 12:9 in a high-definition TV screen has the parent signal of the normal signal. The screen is reproduced, and sub-screens of three types of normal signals are respectively reproduced on three divided screens with an aspect ratio of 4:3 that serve as margins.

[Example] Hereinafter, an example of the present invention will be described using FIGS. 1 and 2.

Figure 1 (a) has 1125 scanning lines and an aspect ratio of 1.
6:9 HDTV screen a is shown. As a high-definition TV, American ACTV (^dvanced Com) has the same aspect ratio as FL D TV.
It can also be applied to patiblc TV). H
In order to reproduce a normal video signal with 525 scanning lines and an aspect ratio of 4:3 on a DTV screen a, it is first necessary to divide the screen into four screens as shown in FIG. When there is one divided main screen with an aspect ratio of 12:9, there are three vertically arranged divided child screens C with an aspect ratio of 4:3 outside of it. In the illustrated example, the main screen is positioned to the left of screen a, and the three child screens C are located on the right side of screen a, but this positional relationship may be reversed. Like this I
If the IDTV screen a is screen-minute;"!I, the number of scanning lines on the main screen is 1125, and each child screen C has 375 (=1125/3) scanning lines.

Therefore, in order to properly reproduce normal video signals having 525 scanning lines in the vertical direction of these divided screens, as shown in FIG.
It is necessary to allocate 1050 scanning lines, which is close to 125, and 350 scanning lines, which is close to 375, to the split child screen C. That is, twice as many scanning lines (525) are run on the main screen C, and the number of scanning lines thinned out by 2 out of every 3 from 525 is run on the sub screen C.

In addition, in order to properly reproduce normal video signals having 525 scanning lines in the horizontal direction of these divided screens, horizontal synchronizing signals d,
d, and the main screen normal video signal e is 1 on the main screen.
It is necessary to compress the time axis to 2/16, and for the child screen C, to compress the child screen normal video signal f to 4/16.

FIG. 2 shows an example of a multi-screen display video playback device of the present invention for realizing the video signal processing described above.

This device mainly consists of one main screen processing circuit 1, first to third child screen processing circuits 2 having exactly the same configuration, and write/read control means 3.

In the main screen processing circuit 1, the main screen normal video signal e is converted into digital data by the A/D converter 4, and then stored in the main screen memory 5. Here, the main screen normal video signal e it t lines to be stored in the memory 5! It may be for either a field or one frame, but for convenience of signal processing, it is desirable to use one frame. A main screen normal video signal e having 525 scanning lines is generated at a writing clock frequency fwo generated by a writing clock generation circuit 7.
to write to the main screen memory 5. The written video signal is read out from the memory 5 at the read clock frequency fco generated by the read clock generation circuit 8. Note that the above writing and reading are performed via the address circuit 6. The video signal to be read is the HD shown in Figure 1 (b).
In order to reduce and fit into the divided main screen of TV screen a,
In order to set the value of fco to 16/12 times the value of fwo and to perform interlace reading twice to make the number of scanning lines 1050, the value is twice that value, that is, finally (16/12) shall be. Note that, instead of reading twice, there is a method of writing twice at the time of writing, but this is not preferable because it requires double the memory capacity compared to the method of reading twice at the time of reading as in this embodiment. After the main screen normal video signal read from the main screen memory 5 at the read clock frequency rco is OR-combined with the sub-screen normal video signal to be described later and converted back into an analog signal by the D/A converter 11, It is supplied to the cathode ray tube of the HDTV as a video output signal.

Here, a main screen deflection synchronization signal output from the write 7' read control means 3 is applied to the write clock generation circuit 7 and the read clock generation circuit 8.
fwo and fco are formed based on this synchronization signal.

On the other hand, in each child screen processing circuit 2, the child screen normal video signal f is converted into digital data by the A/D converter 12, and then stored in the child screen memory 13. A sub-screen normal video signal f having 525 scanning lines is generated at a write clock frequency fwl generated by a write clock generation circuit 15.
to write to memory 13. At this time, the number of 525 scanning lines is thinned out to 2/3 so that the sub-screen normal video signal f fits in the vertical direction of the split sub-screen C of the HD TV screen a shown in FIG. 1(b). Write. The thinning method is arbitrary, but here, it is assumed that scanning lines are thinned out by an integral multiple of 3, such as the third and sixth scanning lines. Therefore, the signals stored in the memory 13 are [1], [2], [4], [5], etc. out of the number of scanning lines [525].
523] and [524] for a total of 350 pieces. Note that there is a thinning method at the time of reading, but this is not preferable because it requires a large memory capacity. The above writing and reading are performed via the address circuit 14.The video signal to be read is read from the first
In order to horizontally reduce and fit the HDTV screen a side child screen C shown in Figure (B), the value of fcl is set to 16 of fwl.
/4 times, and in order to further perform interlacing, double that value, that is, finally (16/4)X2.

Here, a sub-screen horizontal synchronization signal output from the write/read control means 3 is applied to the write clock generation circuit 15 and read clock generation circuit 16, and based on this synchronization signal, "Wo, fco" is formed. It has become so.

In this way, each child screen normal video signal read from each child screen processing circuit 2 is OR-combined with the above main screen video signal, and the main screen side and the child screen side according to the synchronization signal output from the write/read control means 3. address circuit 6.7
is time-divisionally synthesized with the main screen video signal e as follows.

That is, the write/read control circuit 3 has a function of time-divisionally synthesizing the above-mentioned four normal signals and reproducing a composite image suitable for the HD TV screen size.

Specifically, as shown by the solid line in FIG. 3, first, the first main screen normal video signal (1) is sent from the main screen memory 5 up to division horizontal timing 8, which divides the main screen and child screen into left and right parts.
, and from timing A, the first sub-screen memory 13
The first sub-screen normal video signal [1] is then read out. Next, go back and save (2) from the main screen memory 5 to [4
] is read from the child screen memory 13, and in the same way, immediately before the division vertical timing B1, (
175) and [523] from the child screen memory 13. Then, at the division vertical timing Bl, the main screen memory 5
Reading continues, but child screen memory 1
3 switches to the second sub-screen memory 13 and outputs the first sub-screen normal video signal [1] from this second sub-screen memory 13.
Read out.

Thereafter, in the same manner, the sub-screen memory 13 is switched to the third sub-screen memory 13 at the division vertical timing B2, and from this point on, the video signals N], [/I], and
... is read out while being inserted at the end of the main screen normal video signal to perform field scanning.

In the next field scan, the same signals (1), (2), and
. . are read out again, and the remaining signals [2], [5], .

In the above embodiment, the program contents of the main screen and the child screen are not mentioned, but the program contents are, for example, one channel on the main screen, three channels on each of the three child screens, and the video number.
1, Video No. 2, the combinations are completely free, and it is also possible to combine the contents of the laser disc.

[Effects of the Invention] Since the present invention is constructed in place of the above, it produces the following effects.

The multi-screen display system of the video playback device according to claim 1 includes a high-definition TV screen with an aspect ratio of 16:9, one split screen with an aspect ratio of 12:9, and a split screen with an aspect ratio of 4:3.
The main screen normal video signal with an aspect ratio of 4:3 is played back on the former split screen, and the latter three split screens also have an aspect ratio of 4:3.
Since the three types of sub-screens described in Section 3 are designed to play back normal video signals, the screen can be used effectively without creating blank spaces even when playing back normal TV signals on a high-definition TV screen. The multi-screen display video playback device according to claim 2, which allows three reduced child screens to be viewed at the same time without impairing the content or image quality of the main screen,
The number of scanning lines can be reduced to 5 by the memory used in existing Ti digital technology and specially prepared write/read control means.
25 main screen normal video signals with asbec I ratio of 4:3 are compressed in the time axis and inserted into the split screen of a high-definition TV with an aspect ratio of 12.9, and read twice to create a high-definition television signal. While the number of scanning lines is 1050, which is close to the number of scanning lines 1125 of
In addition to thinning the number of scanning lines by 2/3 to 350,
Compressed time axis for high-definition TV with aspect ratio A:3*
It is designed to fit into the N1 screen, so it can fit the high-definition TV screen size with a slight modification of existing digital technology;
A normal signal image of V number can be easily reproduced without causing margins or distortion on the screen. In particular, for the main signal, 2
In addition to reading the data once, the child signals are thinned out to 2/3 when written, so the memory capacity can be reduced, unlike writing twice when writing or thinning out to 2/3 when reading.

[Brief explanation of the drawing]

FIG. 1 is a conceptual diagram showing one embodiment of scanning line number distribution, aspect ratio distribution, and video signal time axis compression for explaining the present invention for reproducing a plurality of normal video signals on a high-definition TV screen. Figure 2 is a block diagram of one embodiment of the device of the present invention;
FIG. 3 is an explanatory diagram of synchronous synthesis scanning of the blocks shown in FIG. 2, and FIG. 4 is an explanatory diagram showing various conventional multiple screen display systems. In the figure, a is the high-definition TV screen, b is the main screen, (: is the child screen, e is the main screen normal video signal, f is the child screen normal video signal, 3 is the write/read control means, and 5 is the main screen. Memory I3 is a sub-screen memory. Applicant: NEC Home Electronics Co., Ltd. Figure 4

Claims (1)

[Claims] 1. In a multi-screen display method for a video playback device that displays a plurality of images of a normal television signal with an aspect ratio of 4:3 on the screen of a high-definition television receiver with an aspect ratio of 16:9, The parent screen of a normal television signal, which maintains the aspect ratio of a normal television signal with an aspect ratio of 12:9, is played back on the screen of a high-definition television receiver in a left-aligned or right-aligned manner, and this playback produces a high-definition television signal. Aspect ratio 4: available on the right or left side of the receiver screen
In the margin of 9, the aspect ratio of the normal television signal is 4:
A multi-screen display method for a video playback device characterized in that sub-screens each holding a number 3 are played back in three vertical columns. 2. A main screen memory that stores normal video signals; 3.
A sub-screen memory that stores the types of sub-screen normal video signals and whose output is OR-connected with the above-mentioned main screen memory, and 525 main-screen normal video signals to the above-mentioned main screen memory; Thin the signal to 2/3 to 3
A write control means for writing 50 sub-screen normal video signals into each of the above-mentioned sub-screen memories, and during one line period, the signals are written from the main screen memory during the 12/16 period and from the sub-screen memory during the 4/16 period. One line of video signal is compressed and read out, and during one field period, 525 video signals are read from the main screen memory, and every 175 of them, the sub-screen memory that stores the above three types of signals is sequentially switched. Then, 175 video signals are read from each switched child screen memory, and during the 2-field period, the 525 video signals read during 1 field period are read again from the main screen memory, and the remaining 175 video signals are read from each child screen memory. It is equipped with a readout control means that sequentially switches and reads out the respective duties, and under the control of this readout control means, the four normal video signals read out from each memory are time-divisionally synthesized, and the main screen and three vertical columns outside the main screen are combined. This multi-screen display video playback device is characterized in that the sub-screen is reduced to a small screen and played back as a plurality of images that fit the screen size of a high-definition television receiver.