JPH05328313A - Ntsc up converter - Google Patents

Abstract

PURPOSE:To display an NTSC type video and a slave screen on a high vision display by allowing a master screen with an aspect ratio of 4:3 which is obtained by converting a video signal to coincide with the vertical length of a display face and displaying a slave picture divided into 9 parts on the right or left end of the screen. CONSTITUTION:After prescribed processing, an NTSC signal is inputted to an input terminal 1 and branched to a master screen signal and a slave screen signal through an A/D converter 2 and a double speed converter 3. The master screen signal is converted into a video signal with the 4:3 aspect ratio of horizontal frequency to be displayed on the high vision display through a time compressing part 4 and the video signal is inputted to a picture synthesizing part 8. On the other hand, the slave screen signal is inputted to a memory 5. An image divider 6 writes a slave picture to be a 9-divided image in the memory 5. A control part 12 instructs the divider 6 to store the picture of a specific part. A signal read out from the memory 5 is compressed to 1/9 by a time compressing part 7 and the slave picture is displayed on the right or left end of the master screen by the synthesizing part 8.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for multi-screen display of current NTSC television signals in a high-definition television receiver.

[0002]

2. Description of the Related Art High-definition broadcasting by satellite broadcasting displays a detailed high-definition image on a large screen with a wide viewing angle, and a new television system pursuing power and presence by adopting a 4-channel stereo audio signal. Is. This high-definition system has a wide / high-definition screen with an aspect ratio of 16: 9 and 1125 scanning lines, which is different from the video signal of the current NTSC system (aspect ratio 4: 3, 525 scanning lines). The NTSC up-converter converts the current NTSC system video signal into a signal that can be displayed on a high-definition display. Figure 4 (A) shows this NT
It is a figure which shows the state which image-displayed the NTSC video signal signal-converted by the SC up converter on the high-definition display. In FIG. 4 (A), 41 is a high-definition display screen with an aspect ratio of 16: 9 and an aspect ratio of 4: 9.
When displaying the current NTSC video signal of No. 3, because of the difference in aspect ratio, if the vertical lengths of the screens are matched, an image of 42 is obtained, and there is a part where nothing is displayed in the left and right diagonal lines of the screen 41. There is multi-screen display as a method of eliminating such unnaturalness and effectively utilizing a portion which is not displayed. FIG. 3 is a schematic configuration diagram of multi-screen generation in the conventional NTSC up converter. In the figure, 1 is an input terminal for a parent screen video signal, 2 is an A / D converter, 3 is a double speed conversion unit, 4 is a time compression unit, 31 is a child screen video signal input terminal, and 32 is an A / D converter. , 33 is a reduction processing unit, 34 is a double speed conversion unit, 35 is a time compression unit, 8 is an image synthesizing unit, and 9 is D / A.
A converter, 10 is an RGB matrix, and 11 is an output terminal. First, the parent screen video signal input to the input terminal 1 is A
It is digitized by the / D converter 2, converted into a digital video signal with a horizontal frequency of 31.5 KHz and an aspect ratio of 4: 3 which can be displayed on a high-definition display by the double speed conversion unit 3 and the time compression unit 4, and is input to the image synthesis unit 8. It On the other hand, the sub-screen video signal input to the input terminal 31 is digitized and then reduced to 1/3 of the data by the reduction processing unit 33 by the decimation process to 1/3 in each of the horizontal and vertical directions. The signal is processed in the same manner as the parent screen video signal, is input to the image synthesizing unit 8, and is synthesized with the signal of the parent screen. The combined multi-screen digital signal output from the image combining unit 8 is converted into an analog signal by the D / A converter 9, and R
RGB matrix 10 becomes RGB video signal and output terminal
Connected to the HDTV display via 11. FIG. 4B shows an example of multi-screen display by the NTSC up converter having the above-mentioned configuration. Here, 41 is a high-definition display screen, 43 is a parent screen with an aspect ratio of 4: 3, and 44 is a child screen with an aspect ratio of 4: 3. The child screen 44 has an area ratio of 1/9 that of the parent screen and can display up to three screens.

The image displayed on the sub-screen may be a moving picture or a still picture displayed by a signal source different from the main screen, a still picture displayed by the same signal source as the main screen, and the like. However, the image displayed on the child screen is 1/3 in both horizontal and vertical as compared with the original image signal (parent screen) as described above.
The video data has been thinned out to
Therefore, there is a problem that the image quality is remarkably deteriorated. On the other hand, there was a need to select and store an arbitrary screen while viewing the main screen and to see it with clear image quality.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an NTSC up-converter is used to convert an aspect ratio of an existing NTSC television signal.
When displaying on a 16: 9 high-definition display,
By using the missing part of the image created by the difference in the aspect ratio of 4: 3, the image of the main screen is divided and stored in the memory, and any divided partial image is displayed as a still image on the child screen. It provides an NTSC upconverter.

[0005]

In order to solve the above-mentioned problems, the present invention has a signal conversion unit such as scanning conversion for receiving a current NTSC system television signal by a high-definition television receiver having a different aspect ratio, In an NTSC up-converter having a signal output from the signal conversion unit as a parent screen and a multi-screen generation unit for displaying a child screen in a portion where an image is missing due to a difference in aspect ratio, an image of the parent screen is horizontally aligned. , Vertically divided into 3 equal parts 9
NTSC comprising a video division unit for dividing into partial videos of a type, a memory for storing a predetermined type of the divided partial videos, and a control unit for controlling selection, display, etc. of the partial video
An upconverter is provided.

[0006]

With the above structure, the NT according to the present invention
In the SC up-converter, when displaying the current NTSC video on the high-definition display, the parent screen with an aspect ratio of 4: 3 obtained by signal conversion of the video signal is made to match the vertical length of the display surface, and Make an unmarked part on either end. Then, nine kinds of partial images obtained by dividing the horizontal and vertical parts of the video signal into three equal parts are arbitrarily selected and stored in the memory in this portion, and are displayed as a plurality of child screens. Therefore, while viewing a normal moving image on the main screen, the selected partial image can be viewed on the small screen as a full-scale still image.

[0007]

The NTSC according to the present invention will now be described with reference to the drawings.
An example of the up-converter will be described. FIG. 1 is a block diagram of essential parts showing a schematic configuration of an NTSC up-converter according to the present invention. In the figure, parts that are the same as or equivalent to those in FIG. In FIG. 1, 5 is a memory for storing a predetermined number of partial images divided into 9, 6 is an image dividing unit for instructing writing to the memory, 12 is an instruction for a partial image to be memorized, reading of data to be displayed from the memory, etc. Is the same as that described in FIG. 3.

Next, the operation of the NTSC up converter according to the present invention will be described. The input NTSC video signal is subjected to predetermined processing and then input to the input terminal 1, and is branched to the signal for the parent screen and the signal for the child screen via the A / D converter 2 and the double speed conversion unit 3. The signal for the parent screen is converted into a video signal having a horizontal frequency of 31.5 KHz and an aspect ratio of 4: 3 which can be displayed on the high-definition display through the time compression unit 4 and is guided to the image synthesis unit 8. On the other hand, the signal branched for the child screen is guided to the memory 5. The memory 5 is provided with at least three child screen memory areas corresponding to the child screens. The video division unit 6 controls the writing of data to the memory 5 and has nine types of writing modes corresponding to nine-divided video images. The control unit 12 instructs the image division unit 6 to store a memory of a specific partial image based on an instruction such as a remote control operation by a viewer, and controls reading of a small screen from the memory 5. The signal read from the memory 5 is converted into a video signal which can be displayed on a small screen on a high-definition display through the time compression unit 7 and is guided to the image synthesis unit 8. The signals of the two systems input to the image synthesizing unit 8 are synthesized into a multi-screen signal for full-screen display on the high-definition display, and are connected to the high-definition display via the D / A converter 9, the RGB matrix 10 and the output terminal 11.

FIG. 2 is a diagram showing a state in which a video signal output from the NTSC up-converter configured as described above is displayed as an image on a high-definition display. In FIG. 2, 21
Is a display surface of a high-definition display (aspect ratio 16: 9), 22 is a parent screen with an aspect ratio of 4: 3, and 23 is a child screen with an aspect ratio of 4: 3. On the main screen 22, enter N
The image of the TSC image signal is displayed normally. The sub screen 13 is
The area ratio is 1/9 of that of the main screen, and the video of the main screen is divided into three equal parts horizontally and vertically and divided into 9 parts.
The arbitrary frame and arbitrary partial image stored in memory are displayed as a full-scale still image. In the present embodiment, the three sub-screens are arranged on the right side of the screen, but the left and right can be reversed.

The NTSC up-converter may be a built-in type built in the high-definition receiver or an adapter type.

[0011]

As described above, the N according to the present invention is
In the TSC up-converter, when displaying the current NTSC system image on the high-definition display, the parent screen with an aspect ratio of 4: 3 is made to match the vertical length of the display surface, and there is no display on either the left or right end of the screen. Make a part. Then, the video signal is divided into 9 parts in this portion, an arbitrary frame and an arbitrary partial video are selected and stored, and a plurality of partial videos are displayed as still images as still images. Therefore, the image quality of the child screen is the same as the parent screen,
It is possible to display and use a desired partial image as a small screen with high image quality.

[Brief description of drawings]

FIG. 1 is a principal block diagram showing a schematic configuration of an NTSC up converter according to the present invention.

FIG. 2 is a diagram showing a display state of a high-definition television receiver in one embodiment of the present invention.

FIG. 3 is a principal block diagram showing a schematic configuration of multi-screen generation in a conventional NTSC up converter.

FIG. 4 Current N by conventional NTSC up-converter
It is a figure which shows the state which displayed the TSC system video signal on the high-definition television receiver, FIG. 4 (A) is a figure which shows a 1 screen display, and FIG. 4 (B) is a figure which shows a multi-screen display.

[Explanation of symbols]

 1 input terminal 2 A / D converter 3 double speed conversion unit 4 time compression unit 5 memory 6 video division unit 7 time compression unit 8 video synthesis unit 9 D / A converter 10 RGB matrix 11 output terminal

Claims (3)

[Claims] 1. A signal conversion unit such as scanning conversion for receiving a current NTSC television signal by a high-definition television receiver having a different aspect ratio, and a signal output from the signal conversion unit is used as a parent screen, and an aspect ratio. In an NTSC up-converter that is provided with a multi-screen generation unit that displays a sub-screen in a portion where a video image is missing due to
An image division unit that divides the main screen image into three equal parts in each of the horizontal and vertical directions and divides into nine types of partial images, a memory that stores the divided partial images in a predetermined type, and the selection and display of the partial images. An NTSC up-converter comprising a control unit for controlling the. 2. The NTSC up-converter according to claim 1, wherein the memory is capable of storing at least three types of partial images. 3. The NTSC up-converter according to claim 2, wherein the NTSC up-converter is a high-definition receiver built-in type or an adapter type.