JPH0265576A - Display system for plural patterns of video reproducing device and video reproducing device displaying plural patterns - Google Patents

Abstract

PURPOSE:To simultaneously observe four slave patterns through the reproduction of a normal TV signal with reproduction by splitting a normal TV pattern into a split pattern whose aspect ratio is 16:9 and into four split patterns having an aspect ratio of 4:3 without any gap, reproducing the former as a master pattern HDTV video signal and reproducing the latter as the 4 kinds of slave pattern normal video signals. CONSTITUTION:The screen of the usual TV pattern is split into a large pattern size having an aspect ratio of 16:9 and four small pattern sizes having an aspect ratio of 4:3, in total 5 patterns. A master pattern high definition TV signal is thinned out to be nearly 9/12 of the scanning lines of the usual TV signal for the slave pattern and the result is written in a master pattern memory. On the other hand, the slave pattern usual TV signal is thinned out to 3/12 and written in the slave pattern memory. Then 5 TV signals outputted form each memory are subject to time division synthesis and the master pattern of the high definition TV signal is reproduced on the split pattern having an aspect ratio of 16:9 in the normal TV pattern and four kinds of usual TV signal slave patterns are reproduced on four other split patterns.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a picture playback device (Picture out Picture .

(hereinafter abbreviated as POP), and particularly relates to a 1Y number screen display method and an IU number dual screen display video playback device for video playback equipment when digitizing and playing back a plurality of video signals with different aspect ratios.

[Prior Art] Recently, high-definition televisions (for example, IDTV), which have better image quality than the current NTSC television receivers (hereinafter referred to as regular TVs), are being developed in many countries including Japan, as they are about to be put into practical use. There are high expectations for it. HD'I
The main features of V are that the number of scanning lines is 125 and the aspect ratio is 16:9. This HD
The number of scanning lines and aspect ratio of TV are different from the normal number of scanning lines and aspect ratio of 525 and aspect ratio of 4:3.
The two are not compatible, so II D TV cannot be used with anything other than dedicated software.

However, it would be very desirable if the video signal of an HD TV could be played back on a regular TV.

In this respect, if digital technology is used, HD can be added to regular TVs.
It is possible to reproduce TV signals.

However, if the image is reproduced as is, the number of scanning lines and aspect ratio are different, so there are disadvantages in that margins appear on the screen or the vertical-horizontal relationship of the screen becomes incorrect.

To resolve this inconvenience, a multi-screen display T that displays multiple normal TV white screens by inserting a sub-screen into the margin screen.
It is possible to make it V. 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,
PIF (PicLure in
(Figure 4 (a))
, for example, Special Publication No. 30552 of 1983, Special Publication of 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 PIF of 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.

In addition, all of these conventional examples convert normal TV signals into normal TV signals.
It is embedded with a white screen.

[Problems to be Solved by the Invention] As mentioned above, when a high-definition TV signal with an aspect ratio of 16:9 is played back as is using digital technology on a normal TV white screen with an aspect ratio of 4:3, there is a blank space on the screen. or j! on the screen. This has the disadvantage that horizontal relationships become strange. However, even if a conventionally known multi-screen display method is adopted to solve this inconvenience, it has its own problems such as different aspect ratios, so it is not only impossible to fill the margins of the screen, but also the width and height of the screen cannot be filled. Nor can the relationship be corrected.

An object of the present invention is to insert a plurality of reduced child screens (171) that maintain the aspect ratio of a normal TV signal into the blank space that occurs when a high-definition TV signal is reproduced on a normal TV white screen, thereby improving the conventional technology described above. A multi-screen display system and multi-screen display video playback method for video playback equipment that can eliminate the drawbacks, make effective use of the screen, and simultaneously view the sub-screen without compromising the content or image quality of the main screen. The goal is to provide equipment.

[Means for Solving the Problems] The multiple screen display method for a video playback device of the present invention is a video playback device that displays a plurality of images of a television signal on the screen of a regular television receiver with an aspect ratio of 4:3. In the 1u multiple screen display method, the screen of a television receiver is usually divided horizontally into aspect ratios of 16:9 and 16:3,
Of these, the split screen with an aspect ratio of 16:3 is further vertically divided into four sub-screens with an aspect ratio of 4:3, and a high-definition television signal with an aspect ratio of 16:9 is transmitted to the split screen with an aspect ratio of 16:9. A normal television signal with an aspect ratio of 4:3 is reproduced on each of the four sub-screens.

Further, the multi-screen display video playback device of the present invention has an aspect ratio of 16:12. i.e. 4
In the video playback device No. 3, a sub-screen memory stores four types of sub-screen normal television signals, and a main screen high-definition television signal having approximately twice the number of scanning lines as the sub-screen normal television signal. At the same time, a main screen memory whose output is OR-connected with the above-mentioned sub-screen memory, and a high-quality television signal thinned out to the above-mentioned main screen memory so that the number of scanning lines of the sub-screen normal television signal is about 9/12,
A write control means thins out the child screen normal television signal and writes it into the child screen memory respectively on 3/12, and switches between the main screen memory and the child screen memory at the vertical synchronization timing on 9/12, and writes the television signal from these. A readout control means for reading out the signals respectively, and sequentially switching the sub-screen memory at every 4/16 horizontal synchronization timing when reading from the sub-screen memory, and reading out the television signal from the switched sub-screen memory, with a cannonball; Under the control of this readout control means, one main screen high-definition television signal read from the memory and four sub-screen normal television signals are time-divisionally synthesized to form a main screen and four horizontal rows outside the main screen. The reduced child screen is reproduced as a plurality of images that fit the screen size of a normal television receiver.

[Operation] The screen size of a regular TV with an aspect ratio of 4:3 can be divided into one large screen size with an aspect ratio of 16:9 and four small screen sizes with an aspect ratio of 4:3. It can be neatly divided into a total of five screens. The aspect ratio of 16:9 is the aspect ratio of a high definition television signal, and the aspect ratio of 4:3 is the aspect ratio of a normal television signal.

That is, on a divided screen of a regular television signal with an aspect ratio of 4:3, high-definition TV and regular TV video signals can be simultaneously reproduced to exactly fit the divided screen size.

The present invention has been made based on this knowledge, and the main screen high-definition TV signal is thinned out to about 9/+2 of the number of scanning lines of the sub screen normal 'v signal under the control of the write control means. The written main screen high-definition TV signal is read out under the control of the read control means.Thereby, when the TV signal output from the main screen memory is reproduced on a normal TV. ,
The playback screen matches the split screen size with an aspect ratio of 16:9.

On the other hand, the sub screen normal TV signal is
12 and written to the child screen memory. This written small screen normal TV signal is read out under the control of the readout control means.

As a result, a TV signal in which the display period of the TV signal is compressed in time by 16/4 times is output from the small screen memory. Therefore, when this TV signal is played back on a normal TV, the playback screen matches the split screen size with an aspect ratio of 4:3. Small screen normal T played on normal TV
Since there are four types of V signals, these four types of TV signals can fill four portions of the divided screen size with an aspect ratio of 4:3 in a normal TV screen.

In this way, under the control of the readout control means, the five 'r■ signals output from each memory are time-division synthesized, and the normal TV! ! The main screen of high-definition TV signals is played on the split screen with an aspect ratio of 16:9 on the i1 screen, and the other four split screens with an aspect ratio of 4:3, which are the other margins, play four types of regular TV signals. The signal sub-screen is played.

[Example] Hereinafter, an example of the present invention will be described using FIGS. 1 to 3.

Figure 1 (a) has 525 scanning lines and an aspect ratio of 4:
3 shows a normal TV sub-screen which is a normal TV of No. 3. The number of scanning lines on the normal TV screen a is 1125, and the aspect ratio is 16:
To play 9I (DTv video (No. 8) and a normal video signal with an aspect ratio of 4:3, first
It is necessary to divide the screen into 50%. Aspect ratio 16:
If there is one divided main screen having a size of 9, there are four horizontally arranged sub-screens C having an aspect ratio of 4:3 on the outside thereof. In the illustrated example, the main screen is located above screen a, and the four child screens C are located below screen a, but this positional relationship may be reversed. If the normal TV sub-screen is divided into 5 parts in this way, the number of scanning lines on the main screen is 3.
93.75 (=525 x 9/12) book, 131.25 (=525 x 3/ l 2) common to child screen C
The book will run.

Therefore, in order to properly reproduce the HD TV signal with 1125 scanning lines and the normal video signal with 525 scanning lines on the upper and lower sides of these split screens, the following steps are required: To split the parent screen as shown in 393
．． It is necessary to allocate 375 (1125/3) scanning lines, which is close to 75 lines, and the remaining 131.25 scanning lines to the split child screen C. In other words, in the main screen, 1
From 125 lines, two out of every three scanning lines are thinned out, and in the child screen C, the number of scanning lines is thinned out by three out of every four lines out of 525 lines.

In addition, in order to properly reproduce normal video signals having 525 scanning lines in the horizontal direction of these split screens, horizontal synchronizing signals d and d are required as shown in FIG.
In between, it is necessary to output the main screen normal video signal e as it is without time-axis compression on the main screen, and to compress the child screen normal video signal f by four times on the time axis on each child screen C.

As a high-definition TV, ACTV (US) has the same aspect ratio as DTV.
It can also be applied to ibleTV).

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 fourth 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 HD TV 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 HD 'r' V video signal e to be stored in the memory 5 may be for one line, one field, or one frame, but for convenience of signal processing, one frame is enough. desirable. 11
A main screen normal video signal e having 25 scanning lines is written into the rough screen memory 5 at a write clock frequency fwo generated by a write clock generation circuit 7.

At this time, the number of 1125 scanning lines is thinned out to 1/3 and written so that the main screen HDTV video signal e fits vertically into the divided main screen of the normal TV sub-screen shown in Figure 1 (b). . The thinning method is arbitrary, but here, 2,
3rd, 5.6th, etc., 3n-1, 3nff
Assume that the i-th scanning line is thinned out. Therefore, the signals stored in the memory 5 are (+), (4), (7), (11) of the number of scanning lines (1125)...
1120) and (1123) for a total of 375 pieces. still,
There is also a method of thinning out data when reading, but this is not preferable because it requires a large memory capacity.

The video signals thinned out to 350 and written are 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. In order to insert the video signal to be read into the divided main screen of the normal TV screen a shown in FIG.
Let the value of o be 1/2 of fwo. This is because the horizontal frequency of HD TV is twice that of normal TV. After the main screen HDTV video signal read out from the main screen memory 5 at the reading clock frequency fco is OR-combined with the sub-screen normal video signal, which will be described later, and converted back into an analog signal by the D/A converter 11, As a video output signal
■Supplies to the cathode ray tube.

Here, the main screen deflection synchronization signal output from the write/read control means 3 is added to the write clock generation circuit 7 and the read clock generation circuit 8, and fwo and fco are formed based on this synchronization signal. It has become so.

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 Δ/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 scanning lines from 525 to 174 is thinned out and written so that the sub-screen normal video signal f fits in the vertical direction of the divided sub-screen C of the HD TV screen a shown in FIG. 1(b). The method of thinning is arbitrary, but here it is assumed that the 4n 2+4n It4nth scanning line is thinned out, such as scanning line 2, 3, 4 [I, 6° 7.8]. Therefore, the signal stored in the memory 13 is [1] out of the number of scanning lines [525].
], [5], [9], [13]...[517]
, [5211, for a total of about 131 lines. Note that there is also a method of thinning out data at the time of reading, but this is not preferable because it requires a large memory capacity. The video signals thinned out to about 131 are read out from the memory 16 at the read clock frequency fcl generated by the read clock generating circuit 16. Note that the above writing and reading are performed via the address circuit 14. The video signal to be read out is shown in Figure 1 (
The value of fcl is set to four times the value of fwl in order to reduce the size of the divided sub-screens C in the horizontal direction of the normal TV screen a shown in b) and insert them into four sub-screens. Here, the write clock generation circuit 15
And the read clock generation circuit 16 has a write/write clock.
A sub-screen horizontal synchronization signal output from the readout control means 3 is added, and fwo and fc are read based on this synchronization signal.

is starting to form.

In this way, each child screen normal video signal read from each child screen processing circuit 2 is OR-combined with the parent screen HDTV video signal, and the main screen side and the child screen according to the synchronization signal output from the write/read control means 3. Under the control of the side address circuits 6 and 7, time-division synthesis is performed with the main screen HDTV video signal e as follows.

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

Specifically, as shown by the solid line in FIG. 3, in the first field scan, the main screen HD TV image is transferred from the main screen memory 5 until vertical division timing B, which separates the main screen and the sub screen vertically. Signal (1), (7)...
(1120) are sequentially read out, and at timing B, the main screen memory 5 is switched to the child screen memory 13, and the child screen normal video signal is read out. When reading the sub-screen normal video signal, first, the first line of sub-screen normal video signal [1] is read from the first sub-screen memory I3. timing AI,
Every time 82°83 comes, the sub screen memory 13 is sequentially changed to 2.
゜3rd. Switching to the fourth sub-screen memory 13, following the sub-screen normal video signal [1] of the first sub-screen memory I3, the sub-screen normal video signal [1] of the remaining sub-screen memory 13, [ 11, Read [+]. After sending the last signal on the l line, return to the beginning and start the second line [9]
The signals of [517] are read out from each sub-screen memo IJ 13 in the same order, and in the same way, at the last 525th scanning line of the normal TV signal, the sub-screen normal video signal signal of [517] is read out, and field scanning is performed. end.

In the next field scan, the remaining signals (4) and (11) are sent from the main screen memory 5 as shown by the dotted lines in the figure.
...(112, 3) are read out sequentially, and the remaining signals [5], [13]... are read from each child screen memory 13.
. . . [521] is newly read out to fill in the gaps in the previous field scan, completing one frame scan.

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 of HDTV on the main screen, three channels of normal TV on each of the four child screens, and video No. 1.゜Video No.2. As in video No. 3, 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 configured as described above, it produces the following effects.

In the 1a multi-screen display method of the video playback device of claim I, a normal TV screen with an aspect ratio of 4:3 is divided into one split screen (!:, an aspect ratio of 4) with an aspect ratio of 16:9.
:3 split screen without any gaps, and the former split screen has a main screen r-r o with an aspect ratio of 16:9.
"rv video signal is generated in rlT, and the latter four split screens are also played with four types of sub-screen normal video signals with an aspect ratio of 4:3, so high quality 'F■ Even when playing back signals, the screen can be used effectively without creating any blank spaces, and four sub-screens, which are normal TV signals played in reduced size, can be displayed at the same time without compromising the content or image quality of the main screen. It becomes possible to see.

In the multi-screen display video playback device of claim 2, the number of scanning lines is twice the normal number and the aspect ratio is 16:9 by using the memory used in existing digital technology and the specially prepared write/read control means. A high-definition TV signal is thinned out so that the number of scanning lines is 9/12 of the normal number and inserted into a split screen of a normal TV with an aspect ratio of 16:9. , four sub-screen normal TV signals with an aspect ratio of 4:3 to 3/1
2 and compress the time axis to an aspect ratio of 4:3.
Because it is fitted into the split screen of a regular TV, it is possible to simultaneously and easily display high-definition TV signal images and regular TV signal images without causing margins or distortions on the regular TV screen by making slight changes to existing digital technology. can be reproduced. In particular, since the parent signal and child signals are thinned out and written, the memory capacity can be reduced compared to the case where they are thinned out during reading.

It is an explanatory diagram showing a formula. In the figure, a is the normal TV screen, b is the main screen, C is the child screen, e is the main screen I (DTV video signal, [] is the child screen normal video signal, 3 is the write/read control means, 5 is the parent screen Screen memory 13 is a child screen memory.

Applicant: NEC Home Electronics Co., Ltd.

[Brief explanation of the drawing]

FIG. 1 shows an example of scanning line number distribution, aspect ratio distribution, and video signal time axis compression for explaining the present invention for reproducing one HDTV video signal and four regular video signals on a regular TV screen. 2 is a block diagram of an embodiment of the device of the present invention, FIG. 3 is an explanatory diagram of synchronized synthesis scanning of the blocks shown in FIG. 2, and FIG. 4 is a diagram of various conventional multiple screen display methods. Figure 4

Claims (1)

[Claims] 1. In a multi-screen display method of a video playback device that displays a plurality of images of a television signal on the screen of a normal television receiver with an aspect ratio of 4:3, the screen of the normal television receiver is , divide the screen horizontally into 16:9 and 16:3 aspect ratios, further vertically divide the split screen with the 16:3 aspect ratio into four sub-screens with the aspect ratio 4:3, and then A video playback device characterized in that a high-definition television signal with an aspect ratio of 16:9 is played back on the split screen, and a normal television signal with an aspect ratio of 4:3 is played back on each of the four sub-screens. Multiple screen display method. 2. Aspect ratio 16 for normal reproduction of television signals
:12, that is, a 4:3 video playback device, has a sub-screen memory that stores four types of sub-screen normal television signals, and a main screen high-definition television that has about twice the number of scanning lines as the sub-screen normal television signal. a main screen memory which stores the television signal and whose output is OR-connected with the above sub-screen memory; and about 9/12 of the number of scanning lines of the sub-screen normal television signal.
The high-definition television signal is thinned out so that the sub-screen normal television signal is 3/12
A writing control means that thins out the data and writes them to the child screen memory respectively, and switches between the main screen memory and the child screen memory at the vertical synchronization timing of 9/12, reads out the television signals from these, and reads the television signal from the child screen memory. readout control means for sequentially switching the sub-screen memory at every horizontal synchronization timing of 4/16 and reading out the television signal from the switched sub-screen memory when reading the sub-screen memory; One main screen high-definition television signal read from the main screen and the four sub-screen normal television signals are time-division synthesized, and the main screen and the sub-screens reduced to four horizontal rows outside the main screen are used for normal television reception. A multi-screen display video playback device characterized by playing back multiple images that match the screen size of the device.