KR100282369B1 - Video signal converter - Google Patents

Abstract

The present invention relates to a video signal converter, and more particularly, to an apparatus capable of realizing both an interlace signal and a progressive signal on a display device. The present invention provides a microcomputer in which a factor for converting resolution of an input video signal and an output video signal is stored, a first signal converting unit converting a first analog RGB signal into a first digital RGB signal, and a first pair coupled to the first analog RGB signal. A clock generator for converting a first synchronization signal into a first clock signal, an image decoder for receiving a luminance signal and a color difference signal, and converting the second clock signal into an interlaced video signal, an interlace signal, and a first digital RGB signal. A resolution converting unit for outputting a second digital RGB signal using an argument stored in the second output unit, receiving a first clock signal and a second clock signal, and outputting a second synchronization signal using the argument stored in the microcomputer; Signal converting unit for converting the signal into a second analog RGB signal, a first output unit for outputting the second analog RGB signal and the second synchronization signal, and a first analog signal The RGB signal, the first synchronous signal, the second analog RGB signal, and the second synchronous signal are input to select one of the first analog RGB signal and the second analog RGB signal, and output the RGB signal. The second output unit may include a second output unit which selects any one of the second synchronization signals to output the synchronization signal, thereby displaying the interlace signal and the progressive signal at an arbitrary resolution.

Description

Video signal converter

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a converter, and more particularly, to a converter for converting an interlaced signal used in a TV, VCR (Video Cassette Recorder), and a progressive signal used in a computer. .

In order to provide a video output from a computer to many people in an exhibition hall or a conference room, a user may connect a general large TV or a projection TV to the computer. However, if an image signal output from a computer is not processed by a computer monitor and is normally processed in a general TV, a separate encoder for converting the image signal of the computer into an interlaced signal is required.

In addition, a user may connect a TV receiving interface device to a computer to watch a TV or VRC image on a computer monitor. In this case, in order for an interlaced video signal used in a TV or TV to be normally processed in a computer monitor, a separate decoder for converting the interlaced video signal into a progressive signal is provided in the TV receiving interface device. It must be installed.

FIG. 1A illustrates a system configured to display a video signal 10 of a computer on a TV 30, and FIG. 1B illustrates a system configured to display a video signal 40 of a TV on a monitor 60 of a computer. It is shown. In general, the computer video signal 10 of the 31.5 KHz frequency band is converted into an interlaced signal through the encoder 20 and input to the TV 30, and the TV video signal 40 of the 15.75 KHz frequency band is used for the decoder 50. Through the progressive signal is restored to the computer monitor 60 through.

Progressive signals may be expressed in various resolutions, such as VGA (Video Graphic Array) mode with 640 × 480 resolution, SVGA (Super VGA) mode with 800 × 600 resolution, and eXtend Graphic Array (XGA) mode with 1024 × 768 resolution or more. Therefore, a display device having a fixed resolution, such as a liquid crystal projector (LCD projector) or a large plasma display panel (PDP), requires both an encoder and a decoder to process image signals having various resolutions.

That is, a liquid crystal display device or a display device such as a plasma display panel should be equipped with an encoder to process a computer video signal and at the same time have a decoder to process a TV video signal.

In the conventional decoder, however, the output signal is fixed in VGA mode, SVGA, and XGA mode, so that the user cannot change the mode. In particular, a display device capable of processing only a video signal of a specific mode, such as a liquid crystal display device or a plasma display panel, has a burden of changing an input source of a video signal and a resolution in a computer in order to change the mode of the video signal. There is this. In addition, a liquid crystal display or a plasma display panel must have a decoder to process a TV signal. As described above, the decoder has a problem in that the output mode cannot be easily changed.

The present invention is to solve this problem, the video signal which can be output to various display devices, such as TV, large projector, computer monitor, etc. The purpose is to provide a transducer.

1A is a block diagram illustrating a system configured for displaying a video signal of a computer on a TV.

1B is a block diagram illustrating a system configured for displaying a video signal of a TV on a monitor of a computer.

2 is a block diagram illustrating in detail the components of the present invention;

Fig. 3 is a block diagram showing an example of using the converter of the present invention.

Explanation of symbols for main parts of the drawings

100: computer signal input unit 300: TV

400: TV signal input unit 410: V Signal input unit

500: video signal converter 510: micom

520: first signal converter (A / D converter) 30: clock generator

540: image decoding unit 550: resolution conversion unit

551: memory 552: scaler

560: second signal conversion unit (D / A converter) 570: second output unit

571: selector switch 572: buffer

580: first output unit (buffer) 590: ave switch

591 antenna 592 tuner

593: AV output unit (buffer) 600: computer monitor

610: large display device

The present invention is characterized by converting and outputting the resolution of an input image using a resolution converter in which a predetermined resolution conversion factor is stored.

The video signal converter 500 according to the present invention includes a microcomputer 510 in which a parameter for converting a resolution of a video signal is stored as shown in FIG. 2, and a first signal converter for converting an analog RGB signal into a digital RGB signal ( 520, a clock generator 530 for converting a synchronous signal paired with an analog RGB signal input to the first signal converter 520 into a clock signal, and an interlaced video signal and a clock by receiving a luminance signal and a color difference signal. The video decoder 540 converts the signal into an interlaced video signal, a digital RGB signal, and the clock signals converted by the clock generator 530 and the video decoder 540. A resolution converter 550 for outputting a corrected RGB signal and a synchronization signal, a second signal converter 560 for converting the corrected RGB signal into an analog signal, and an analog signal converted by the second signal converter 560. And resolution converter 550 The first composite video signal and the second signal conversion in which an analog RGB signal inputted to the first signal conversion unit 520 and a synchronization signal paired thereto are combined. A second output unit 570 which selects any one of the second composite video signal in which the analog signal converted by the unit 560 and the synchronization signal output from the resolution converter 550 are combined and outputs the RGB signal and the synchronization signal. ) Is configured to include.

The microcomputer 510 stores various factors for converting the resolution of the video signal input to the video signal converter 500 from the outside. The microcomputer 510 may generate video signals having various resolutions with reference to the argument. These arguments are of the form shown in Table 1 below.

Output type Input type VGA mode SVGA mode XGA mode Other modes Interlaced signal a1 a2 a3 a4 VGA x b1 b2 b3 SVGA c1 x c3 c4 XGA d1 d2 x d4 Etc e1 e2 e3 e4

The first signal converter 520 digitizes the progressive first analog RGB signal and converts it into a first digital RGB signal. The first analog RGB signal is a signal output from a computer or the like and input to a monitor. However, when the first analog RGB signal is input to the video signal converter 500 of the present invention, the first analog RGB signal is converted to implement an image in various display devices.

The clock generator 530 converts the first synchronization signal coupled to the first analog RGB signal into a first clock signal. The image decoding unit 540 receives the interlace luminance signal Y and the color difference signal C from the outside, and receives the luminance signal Y, the first color difference signal RY, and the second color difference signal BY. And converts into a second clock signal.

The resolution converter 550 receives the luminance signal, the first color difference signal, the second color difference signal, and the second clock signal converted by the image decoder 540, and receives the first digital RGB signal and the first clock signal. . Thus, the resolution converter 550 outputs the second digital RGB signal by referring to the argument stored in the microcomputer 510 and outputs the second synchronization signal. That is, the resolution converter 550 receives the first digital RGB signal of the progressive method or the interlaced signal composed of the luminance signal, the first color difference signal, and the second color difference signal to convert the resolution to convert the second digital RGB signal. To print. In addition, the resolution converter 550 receives the first clock signal or the second clock signal, generates a synchronization signal corresponding to the converted resolution, and outputs the second synchronization signal.

As illustrated in FIG. 2, the resolution converter 550 may include a memory 551 for storing a progressive digital RGB signal or an interlaced signal input from an external device and a signal stored in the memory 551. And a scaler 552 for correcting and converting a clock signal according to the stored factor.

The second signal converter 560 converts the second digital RGB signal output from the resolution converter 550 into a second analog RGB signal. That is, the second signal converter 560 outputs an analog RGB signal whose resolution is converted compared to the analog RGB signal input to the first signal converter 520.

The first output unit 580 applies the second analog RGB signal output from the second signal converter 560 and the second synchronization signal output from the resolution converter 550 to an external display device.

The second output unit 570 receives an externally input first analog RGB signal, a first synchronization signal, a second analog RGB signal, and a second synchronization signal. The second output unit 570 selects one of the first analog RGB signal and the second analog RGB signal to output the RGB signal, and selects one of the first synchronization signal and the second synchronization signal to synchronize the signal. Outputs

The second output unit 570 selects one of the first analog RGB signal and the second analog RGB signal, a selection switch unit which selects one of the first synchronization signal and the second synchronization signal, and the second switch unit. The buffer unit 572 transmits all of the selected signals to the external display device.

At this time, the video signal converter 500 of the present invention selects a TV broadcast signal or a video signal output from an image reproducing apparatus such as a video tape recorder, and outputs it to an image decoding unit 540 (A / V). It may be configured to include a switch unit.

Hereinafter, the operation principle of the present invention will be described with reference to FIGS. 2, 3, and 4.

(How to handle interlaced signal)

The TV broadcast signal received through the antenna 591 is divided into a video signal and an audio signal through the tuner 592 unit. After that, when the TV broadcast signal is selected by the AV switch 590, the AV signal is output through the buffer 593 to output the video signal and the audio signal. Then, as shown in FIG. 3, the user may connect the TV 300 to the AV output unit to watch the video and audio by the TV broadcast signal 400.

In addition, when the video signal and the audio signal reproduced in the VCR (Video Cassette Recorder) or VTR (Video Tape Recorder) are selected by the AV switch 590, the user is as shown in FIG. The AV 300 may watch the video and audio played through the V-Cal 410 or the V-Tal through the TV 300 connected to the output unit.

If the user wants to watch the interlaced TV broadcast signal 400 on the external large display device 610 or the computer monitor 600, the TV broadcast signal 400 must be converted into a progressive signal. The process of converting an interlaced signal into a progressive signal is as follows.

First, the TV image selected by the AV switch 590, or the composite image signal of VRC is separated into a luminance signal and a color difference signal by a comb filter. At this time, when a signal separated into a luminance signal Y and a color difference signal C, such as an S-VHS signal, is input to the video signal converter 500 of the present invention, instead of the composite video signal, the present invention provides the S- The luminance signal and the color difference signal corresponding to the VHS signal are directly input to the image decoder 540. Then, the luminance signal and the color difference signal are restored by the image decoding unit 540 into the first color difference signal R-Y, the second color difference signal B-Y, and the luminance signal.

The luminance signal output from the image decoder 540 and the first and second color difference signals are input to the scaler 552 of the resolution converter 550. Then, the resolution signal of the luminance signal input to the scaler 552 and the first and second color difference signals are converted by the factor of the microcomputer 510.

If the user intends to display the TV signal on a computer monitor or a large projector in a VGA mode screen, the scaler 552 of the present invention converts the TV signal in the 15.75 KHz frequency band into a monitor signal in the 31.5 KHz band. Then, since the horizontal frequency of the VGA mode screen is twice the horizontal frequency of the TV screen, the scaler 552 of the present invention refers to a factor stored in the form of a lookup table in the microcomputer 510 when the band is 31.5 KHz. Generate pixel data corresponding to the image of. The pixel data generated by the scaler 552 is stored in the memory 551 of the resolution converter 550.

The pixel data stored in the resolution converter 550 is a digital RGB signal, and is converted into an analog RGB signal by a D / A converter 560 (Digital to Analog Converter). The analog RGB signal output from the D / A converter 560 is input to the external display device through the first output unit 580. In this case, when a user connects a display device for processing a progressive signal, such as a large liquid crystal projector, to the first output unit 580, an interlaced TV signal may be viewed on a display device for processing a progressive signal.

(How to convert progressive signal in SVGA mode to VGA mode)

The process of converting the video signal of the SVGA mode inputted through the computer input terminal into the video signal of the VGA mode is as follows. That is, the method of lowering and outputting the resolution of the video signal is as follows.

When an analog RGB signal with a 800 × 600 resolution and a synchronization signal are input through a computer input terminal (PC IN), the analog RGB signal is converted into a digital RGB signal by an A / D converter 520 (Analog to Digital Converter). The synchronization signal is converted into a clock signal by the clock generator 530.

The pixel data of the digital RGB signal converted by the A / D converter 520 is all stored in the memory 551 of the resolution converter 550. Then, the scaler 552 of the resolution converter 550 converts the pixel data stored in the memory 551 to 640 × 480 resolution with reference to the argument stored in the microcomputer 510. At this time, the scaler 552 of the present invention first converts to 800 × 480 resolution in order to prevent degradation of the horizontal pixel data. There are several ways to reduce 600 lines of vertical data to 480 lines.

The scaler 552 of the present invention deletes pixel data stored in the memory 551 by one line for every five lines to reduce 600 lines of vertical data to 480 lines, and interpolates using the top and bottom data of the deleted lines. By performing the step, vertical data is reduced while preventing deterioration of the vertical pixel data.

Thereafter, the digital RGB signal converted to 800 × 480 resolution is converted into an analog RGB signal by the D / A converter 560. At this time, the video signal converter 500 of the present invention can obtain the effect of converting 800 horizontal data into 640 horizontal data by increasing the clock speed of the D / A converter.

The 640 × 480 resolution analog RGB signal converted by the resolution converter 550 and the D / A converter 560 is displayed in the VGA mode on the external display device through the first output unit 580. As a result, the video signal of the SVGA mode of 800x600 resolution is converted into the video signal of the VGA mode of 640x480 resolution.

(How to convert progressive signal in VGA mode to SVGA mode)

The process of converting the video signal of the VGA mode input through the computer input terminal into the video signal of the SVGA mode is as follows. That is, the method of increasing the resolution of the video signal and outputting the method is as follows.

When an analog RGB signal having a 640 × 480 resolution and a synchronization signal are input through a computer input terminal (PC IN), the analog RGB signal is converted into a digital RGB signal by an A / D converter 520 (Analog to Digital Converter). The synchronization signal is converted into a clock signal by the clock generator 530.

The pixel data of the digital RGB signal converted by the A / D converter 520 is converted to 800 × 600 resolution by the scaler 552 of the resolution converter 550, so that the memory 551 of the resolution converter 550 is converted. Are all stored in. At this time, the scaler 552 converts the resolution by referring to the factors of the microcomputer 510 as shown in Table 1 below.

The 800 × 600 resolution analog RGB signal converted by the resolution converter 550 and the D / A converter 560 is displayed in the VGA mode on the external display device through the first output unit 580. As a result, the video signal in VGA mode with 640x480 resolution is converted into the video signal in SVGA mode with 800x600 resolution.

That is, according to the present invention, when the resolution of the progressive video signal is increased and converted, the input video signal is stored in the memory 551 of the resolution converter 550 and then converted. First, the conversion is performed and then stored in the memory 551 of the resolution conversion unit 550.

In addition, the present invention selectively selects the first analog RGB signal and the interlaced signal input through the computer input terminal or the second analog RGB signal whose resolution is converted by the selection switch 571 of the second output unit 570. 2 may be output to the buffer 572 of the output unit 570. The selection operation of the selection switch 571 is made by the control signal of the microcomputer 510.

If the video signal 100 is input through the computer input terminal and the computer monitor 600 is connected to the second output unit 570, the microcomputer 510 of the present invention monitors the computer video signal 100 directly. The selection switch 571 is controlled to be output to 600. In addition, if the interlace video signals 400 and 410 are input to the image decoding unit 540 by the AV switch 590 and the computer monitor 600 is connected to the second output unit 570, the microcomputer of the present invention ( The 510 controls the selection switch 571 such that the second analog RGB signal output from the second converter D / A converter 560 is output to the monitor 600.

The video signal converter 500 of the present invention, in addition to the above-described components, a control key for inputting a predetermined control signal to the microcomputer 510 by a user's operation and a preamplifier for inputting a signal input from the remote controller to the microcomputer 510. In addition, the EEPROM or the like in which the data or the program of the video signal converter 500 of the present invention is further configured.

The present invention may display an interlaced signal output from a TV and a VLC as an image on a TV, or may be displayed on a large display device such as a computer monitor or a plasma display panel. The progressive signal output from the computer may be output to a computer monitor, or the resolution may be arbitrarily converted and displayed on a large display device. That is, the video signal converter of the present invention can convert the signal type as needed regardless of the type of the input device and the output device, and there is no need to connect the input device and the output device by changing the conventional encoder or decoder.

In particular, the image signal converter of the present invention can display the image signal output from the computer on a large display device at the same time in addition to one monitor, it can be very useful in the educational system of the school.

Claims (4)

Microcomputer with arguments for converting resolution of input video signal and output video signal A first signal converting unit converting the first analog RGB signal into a first digital RGB signal, A clock generator for converting the first synchronization signal coupled to the first analog RGB signal into a first clock signal; An image decoder which receives a luminance signal and a color difference signal and converts the second clock signal into an interlaced video signal; Receives the interlace signal and the first digital RGB signal and outputs a second digital RGB signal using the argument stored in the micom, and receives the first clock signal and the second clock signal and receives the argument stored in the micom. A resolution converter which outputs a second synchronization signal by using A second signal converting unit converting the second digital RGB signal into a second analog RGB signal; A first output unit configured to output the second analog RGB signal and the second synchronization signal, and Receiving one of the first analog RGB signal, the first synchronization signal, the second analog RGB signal, and the second synchronization signal, selecting one of the first analog RGB signal and the second analog RGB signal, and outputting an RGB signal; And a second output unit configured to select one of the first synchronization signal and the second synchronization signal to output the synchronization signal. The method of claim 1, wherein the resolution converter A memory for storing the first digital RGB signal or the interlaced signal, And a scaler for correcting a signal stored in the memory according to a factor stored in the microcomputer and converting a clock signal. The image signal converter of claim 1, wherein And an A / V switch unit for selecting a TV broadcast signal and a video reproduction signal and outputting the same to the video decoder. The method of claim 1, wherein the second output unit A selection switch unit which selects one of the first analog RGB signal and the second analog RGB signal, and selects one of the first synchronization signal and the second synchronization signal; and And a buffer unit which transmits all the signals selected by the selection switch unit to an external display device.