KR100213005B1 - Screen moving device - Google Patents

Abstract

The present invention relates to a screen moving apparatus in a television broadcasting conversion apparatus.

The present invention provides an input processing unit for performing A / D conversion, automatic level control (ALC), de-emphasis, etc. by introducing an incoming high-vision television signal, and pre-processing to remove the raising of the processed data from the input processing unit. And a time conversion unit for data conversion, aspect ratio conversion, and scanning player from the hi-vision system to the NTSC system, and the final NTSC composite video signal or R, G, B color signal by D / A conversion of luminance and color difference signals. A high-vision image as a standard television signal, including an output processing unit for outputting and a screen moving control unit for outputting a control signal for shifting the vertical position of the parent screen of the PIP screen according to the screen position selection signal to the time change unit and the output processing unit. When the screen is converted to a PIP screen and displayed on a standard television screen, the mother screen can be moved up or down to prevent the mother screen from overlapping the mother screen.

Description

Scroller

1 is a block diagram of a conventional television broadcasting converter.

2 is a view for explaining the output screen of the television broadcasting system conversion apparatus shown in FIG.

3 is a view for explaining the case where the PIP function is applied to the output of the television broadcasting system conversion apparatus shown in FIG.

4 is a block diagram according to an embodiment of a screen moving apparatus according to the present invention.

FIG. 5 is a detailed block diagram of the control signal and screen shift signal generator shown in FIG.

FIG. 6 is a diagram for explaining the case where the PIP function of the screen moving device shown in FIG.

* Explanation of symbols for main parts of the drawings

10: input processing unit 20: control signal and screen movement signal generator

30: preprocessing unit 40: time conversion unit

50: output processing unit

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a screen moving apparatus in a television broadcasting system converting apparatus. In particular, in a television broadcasting system converting apparatus displaying a high-vision system image as an NTSC image, the image is removed by removing a blank portion of the upper or lower part of the screen. The present invention relates to a screen shifting device that moves up or down to prevent overlapping with the currently displayed horizontal image when inserting a PIP or subtitle.

Currently, television broadcasting has a different form by country and region. The differences between television systems are the scanning player, the aspect ratio of the screen and the scanning method. Current television broadcasts have limited resolution.

The reason for this is that the improvement of TV picture quality until now has been difficult due to the limitation of the standard that maintains compatibility with existing methods, and the improvement of picture quality is difficult.

Accordingly, the result of the effort to improve the image quality regardless of the standard or the compatibility is that the TV broadcasting method with a higher resolution than the current TV broadcasting method is called MUSE (Multiple Sub-Nyquist Sampling Encoding). High Definiton Television (HDTV) has been developed in Japan.

The mute method has an aspect ratio of 1125 scan lines and a 9:16 screen. Therefore, the current television receiver of NTSC system having 525 scanning lines and aspect ratio of 3: 4 screen cannot receive a mute television signal.

However, since the price of a receiver for receiving a separate HDTV broadcast is too high for a consumer to purchase, the HDTV signal transmitted by the MUSE method is used to satisfy the need for viewing the HDTV broadcast program of a consumer having an existing NTSC TV. MUSE / NTSC converters are being developed so that they can be received through existing NTSC televisions.

In addition, the high definition TV to be put to practical use has an aspect ratio of 9:16, and the second generation EDTV (Extended Definition TV), which is currently under consideration, has an aspect ratio of 9:16.

The high-vision video of this standard is displayed on an existing TV via the television broadcasting conversion apparatus shown in FIG.

According to FIG. 1, in a down converter such as an HDTV / NTSC converter or a MUSE / NTSC converter, the time converter 4 performs a time conversion operation using a field memory having a separate read / write port. At this time, the field memory is supplied with a signal for initializing the memory address in every field from the control signal generator 2.

The control signal generator 2 then generates a synchronization signal having a predetermined time delay relationship with this signal and supplies it to the output processor 5.

In such a down converter, the time delay interval is fixed, and when the final output image is displayed on the TV screen, the image position on the screen is fixed.

That is, since the aspect ratio of the conventional TV is 3: 4, black portions appear in the upper and lower portions of the screen as shown in FIG. In this case, as shown in FIG. 2, when displaying a horizontal screen having an aspect ratio of 9: 16 on an existing TV screen having an aspect ratio of 3: 4, the portion where the actual image is displayed is about 340 scan lines except for a portion having no upper and lower images. Becomes

This is the case in the wide mode in which the entire HD image is displayed when converting an aspect ratio of 3: 4 into an NTSC image from a MUSE image having a 9 to 16 aspect ratio for a 1125 liner to an NTSC image. In order to maintain the aspect ratio of the 9:16 HD image, only 344 lines among the 525-line scan athletes become valid screens.

On the other hand, when the HD video output from the down converter is used as the mother screen and the picture of the aspect ratio 3: 4 is displayed on the NTSC television screen with the PIP function as its own screen, as shown in PIP, as shown in FIG. The size of the sub picture is usually 1/2 or 1/3 of the main picture so that the hardware of the PIP circuit can be easily configured.

If it is set to 1/3, the vertical direction of the sub picture is about 160 scan lines. As shown in FIG. 3, since the vertical size of the part without an image at the lower part of the mother screen is about 70 scan lines, the conventional down converter In the case of the high-vision output image is displayed on the NTSC TV screen, since the image position on the screen is fixed, there is a problem that overlaps about 90 scan lines of the parent screen image.

In order to overcome the above-mentioned problems, an object of the present invention is to provide an HDTV or EDTV screen having an aspect ratio of 9: 16 on a standard TV screen having an aspect ratio of 3: 4, and when the PIP function is performed, The present invention provides a screen shifting device that displays a parent screen and a child screen without overlapping by moving the vertical position.

In order to achieve the above object, the screen shifting device according to the present invention converts a high-vision television signal whose aspect ratio is different from that of a standard television signal into a standard television signal in a wide mode, thereby converting a standard television screen into a PIP screen. A television broadcasting system converting apparatus for displaying on the screen; An input processing unit which inputs the incoming high-vision television signal to perform A / D conversion, automatic level control (ALC), de-emphasis, etc .; A preprocessing unit which removes an aliasing of the processed data from the input processing unit; A time conversion unit for performing data conversion and aspect ratio conversion from the high vision system to the NTSC system, and converting the scanning player by operating as a clock of the NTSC system; An output processor for performing D / A conversion on luminance and color difference signals and outputting the final NTSC composite video signal or R, G, and B color signals; And a screen shift controller for outputting a control signal for shifting the vertical position of the parent screen of the PIP screen according to the screen position selection signal to the time converter and the output processor.

Hereinafter, exemplary embodiments of the screen moving apparatus according to the present invention will be described with reference to the accompanying drawings.

4 is a block diagram according to an embodiment of a screen moving apparatus according to the present invention.

Referring to FIG. 4, the screen shifting device according to the present invention includes an input processing unit 10 including an A / D converter (not shown), an automatic level control (ALC), a phase locked loop (PLL), a de-emphasis unit, and the like. The control signal for outputting a control signal for moving the vertical position of the screen according to the screen position selection signal and the screen movement signal generator 20 and the input processor 10 may be generated by field offset sampling or frame offset sampling. a pre-processing section 30 for eliminating alising), and a field memory, which performs data conversion and aspect ratio conversion from the Hi-Vision system to the NTSC system, and operates as a clock of the NTSC system to convert the scanning player. 40), and a D / A converter for D / A converting the luminance and color difference signals, and an output processor (50) comprising an NTSC encoder for making final NTSC composite video signals or R, G, and B color signals.

Here, the control signal and the screen shift signal generator 20 are the address initialization signal generator 21 and the address initialization signal generator 21 for generating the address initialization signal of the field memory of the time converter 40 as shown in FIG. Selecting one of the first delayer 22, the delayed signal of the first delayer 22, and the undelayed signal of the address initialization signal generator 21, which delays the output signal of (21) by 35 scan line periods. A second delayer 25, a second delayer for delaying the output signal of the first multiplexer 23, the synchronization signal generator 24 for generating a synchronization signal of the NTSC system, and the synchronization signal generator 24 by 35 scan line periods; A selection control signal for controlling the output signals of the second multiplexer 26 and the first and second multiplexers 23, 26 which selectively select the delayed signal of 25 and the non-delayed signal of the synchronization signal generator 24; It consists of a demultiplexer 27 for generating a.

Next, the operation of FIG. 4 will be described with reference to FIGS. 5 and 6.

According to FIG. 4, first, a screen position selection signal (up / down / down) for designating a screen position from the outside is input to the control signal and the screen shift signal generator 20. FIG. In response to this signal, the control signal and the screen shift signal generator 20 change the control signals supplied to the time converter 40 and the output processor 50 to display the final output signal on the TV screen. Allow the position to change.

That is, the relative time delay relationship between the memory address initialization signal applied to the time conversion section 40 and the synchronization signal applied to the output processing section 50 is varied by an external screen position selection signal.

The screen position selection signal, which is an external input control signal, is transmitted by the demultiplexer 27. And After made of two signals Indicates whether the memory address initialization signal is delayed, Is used as a signal to control the delay of the synchronization signal.

If the external input control signal is in the middle, then the correlation between the memory address initialization signal and the synchronization signal is the same as that of the down converter according to the conventional method. If the virtual is instructed, it is a screen movement control signal output from the demultiplexer 27. Therefore, the second multiplexer 26 selects the output of the second delay unit 25 and outputs it to the output processing unit 50 so that the synchronization signal is delayed by 35 scan periods more than when it is in the middle, and the memory address initialization signal generator ( The memory address initialization signal 21) selects a signal that is not delayed by the first multiplexer 23 and sends it to the time conversion section 40.

This delays the synchronization signal by 35 scan lines compared to the video signal, and the memory address initialization signal emits an undelayed signal. This results in a delay of about 35 scan lines for the sync signal compared to the video signal, and finally, the image displayed on the screen rises up by 70 scan lines than during the video signal.

The reason why the second delayer 25 delays the 35 scan lines and moves them by 70 scan lines is because the conventional TV system is an interlace method, and when there is a parallax by 35 fields in each field, the screen is delayed by 70 times the double scan line. Because it seems.

In the middle of the screen (blank) in the upper part of the screen (blank) is about 70 scan lines, so the image is now appearing in the form of the upper part of the screen.

Lastly, when the external input control signal indicates the lower, the screen shift control signal output from the demultiplexer 27 is opposite to the case of the upper phase. As a result, the first and second multiplexers 23 and 26 select a signal whose memory address initialization signal is delayed by 35 scan line periods by the first delay unit 22, and outputs the signal to the time conversion section 40. Outputs the non-delayed NTSC synchronization signal to the output processing unit 50.

Therefore, since the image signal is delayed by 35 scan lines compared to the synchronization signal, the image is finally lowered by 70 scan lines than when the screen is in the middle.

Therefore, as shown in FIG. 6, if the position of the parent screen is moved upward to coincide with the upper part of the screen, the vertical size of the part without the image at the bottom of the screen is about twice as large as that of FIG. 2 and FIG. That's about 140 scan lines. This reduces the portion of the mother screen that covers the mother screen than in FIG. 3, so that the contents of the mother screen can be viewed almost completely as shown in FIG. 6.

As described above, the screen moving apparatus according to the present invention is a down converter for displaying an HDTV image having an aspect ratio of 9: 16 on an existing TV screen having an aspect ratio of 3: 4, and an image signal such as an existing TV signal or another down converter. When receiving a signal from a circle and displaying the PIP, the mother screen can be moved up or down to avoid the overlapping of the mother screen, so that the contents of both screens can be seen.

Claims (4)

A television broadcasting system converting apparatus for converting a high-vision television signal having an aspect ratio different from that of a standard television signal into a standard television signal in a wide mode and displaying the PIP screen on a standard television screen; An input processing unit for introducing the incoming high-vision television signal to A / D conversion, ALC (Automatic Level Control), de-emphasis, etc .; A preprocessing unit which removes an aliasing of the processed data from the input processing unit; A time conversion section for performing data conversion and aspect ratio conversion from the hi-vision system to the NTSC system, and operating with a clock of the NTSC system to convert the scanning player; An output processor for performing D / A conversion on luminance and color difference signals and outputting the final NTSC composite video signal or R, G, and B color signals; And a screen shift controller for outputting a control signal for shifting the vertical position of the parent screen of the PIP screen according to the screen position selection signal to the time converter and the output processor. The display apparatus of claim 1, wherein the screen movement control unit comprises: an initialization signal generator configured to generate an initialization signal for resetting the scanning player conversion and the aspect ratio conversion of one screen by the time conversion unit; A synchronization signal generator for generating a synchronization signal of the NTSC system; A first delayer for delaying the output signal of the initialization signal generator by a first integer scan line period; A first selector for selecting a delayed signal of the first delay or an undelayed signal of the initialization signal generator; A second delay unit for delaying the output signal of the synchronization signal generator by a first integer scan line period; A second selector for selectively selecting a delayed signal of the second delayer or an undelayed signal of the synchronization signal generator; Selecting to generate the selection control signal of the first and second selectors such that the relative time interval between the memory address initialization signal and the synchronization signal is changed by controlling the output signals of the first and second selectors according to the screen position selection signal from the outside. And a control signal generator. 3. The method of claim 2, wherein when the screen position selection signal is different, the first selector outputs an undelayed signal of the initialization signal generator to the time conversion unit, and the second selector delays synchronization of the second delay unit. And outputting a signal to the output processor so that the synchronization signal is delayed by the first predetermined integer scan line by the second predetermined number scan line and moved upward by the second predetermined integer scan line than the normal image signal. 4. The method of claim 3, wherein when the screen position selection signal is low, the first selector outputs a delayed signal of the first delay unit to the time conversion unit, and the second selector outputs an undelayed synchronization of the synchronization signal generator. And outputting a signal to the output processing unit so that the image signal is delayed by a first predetermined integer scan line compared to the synchronous signal, and thus moved downward by a second predetermined integer scan line than the normal screen.