KR100206769B1 - Decorder for broadcasting system - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display technology for displaying text information and screens in a broadcasting system that provides electronic program guide (EPG) information as in satellite broadcasting. In the conventional electronic program guide decoder, an electronic program is provided to provide more information. During the guidance, there was a defect that the user could only search the text information but could not watch the image of the selected program at all. To solve this problem, the present invention solves this problem. An output format control unit 405 for calculating the size information and outputting the sample rate control signal according to the output format control unit 405, and outputting the position information of the reduced image to the multiplexer 409, and the sample rate control signal. Accordingly, the sample rate of the video signal output from the video decoder 404 is changed to The display image buffer 407 using a sample rate converter 406 for generating a screen image signal and storing the same in a display image buffer 407 and position information of a reduced image output from the output format controller 405. ) Includes a multiplexer 409 for synthesizing the video signal stored in the < RTI ID = 0.0 > and < / RTI > the electronic program guide video signal output from the on-screen signal generator 408.

Description

Decoder for guiding electronic program of broadcasting system

1 is a block diagram of an electronic program guide decoder of a general general broadcasting system.

2 is a diagram illustrating a general program guide on-screen.

3 is an example of electronic program guide display by a general electronic program guide decoder.

4 is a block diagram of an electronic program guide decoder of the present invention broadcasting system.

5 is a diagram illustrating an electronic program guide display according to the present invention.

* Explanation of symbols for main parts of the drawings

401: first-in, first-out 402: central processing unit

403: RAM 404: Video Decoder

405: output format control unit 406: sample rate converter

407: display image buffer 408: on-screen signal generator

409: multiplexer

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display technology for displaying text information and screens in a broadcasting system that provides electronic program guide (EPG) information as in satellite broadcasting. The present invention relates to an electronic program guide decoder of a broadcasting system.

On-screen display is a method of superimposing characters or graphic information on the same screen while displaying an image, and is currently widely used in television sets or V-Cal. In the analog television receiver, a separate graphics processing unit and a video memory (VRAM) are mainly used to implement on-screen, and on-screen information includes a menu or TV screen control situation and time.

In addition, recently, a technology for transmitting text and data information to a vertical blanking section (VBI) at a transmitting side (broadcasting station), detecting the same at the receiving side, and displaying captions, data, and program guides is commercially available.

The digital image processor also requires digital image reconstruction and output of graphic characters using on-screen. As an example of a digital image processor, the digital video decoder is provided with digital data processing means for restoring image information. It can be implemented by including an output device.

FIG. 1 shows an example in which an on-screen output device is configured in a digital image decoder. The operation thereof will be described with reference to FIGS. 2 and 3 as follows.

The compressed video stream is stored in the first-in first-out (FIFO) 101 via the data bus and then read by the central processing unit 102 and stored in the RAM 103.

When an external control command CS is input to the central processing unit 102 through the state bus, the video decoder 104 is controlled according to the control command, and the video decoder 104 stores the bits stored in the RAM 103. The video is restored by reading the stream.

The size of the image reconstructed by the video decoder 104 is equal to the size of the image generated by the transmitter. In the case of displaying NTSC-class images on a digital screen, the number of standard pixels is 740 × 480. When the size of the reconstructed image is smaller than the standardized number, the central processing unit 103 drives the sample rate converter 105. Since the image signal reconstructed by the video decoder 104 is sampled and output as a standard size image signal through the sample rate converter 105, the image is always displayed on the entire screen regardless of the size of the input image.

In addition, in order to support an image and an on-screen, the central processing unit 102 stores data in an on-screen format for outputting an on-screen in the RAM 103 and reads the data when the on-screen screen is to be displayed. It is output to the on-screen signal generator 106 side.

Accordingly, the on-screen signal generator 106 uses the input on-screen information to output an image signal according to the position, size, and color on the output screen, that is, the whistle signal Y 'and the color difference signal Cb', (Cr). ') And output the overlay control signal OCS at its output point.

Therefore, the multiplexer 107 normally outputs the image signals Y, Cb, and Cr output from the sample rate converter 105, and when the overlay control signal OCS is input, the image signal Y ), (Cb) and (Cr) are synthesized and outputted by the image signals Y ', (Cb') and (Cr ') output from the on-screen data generator 106. FIG. The background image (car) and the on-screen output are shown.

Meanwhile, FIG. 3 illustrates an example of performing an electronic program guide (EPG) on a full screen by using the on-screen function displayed through the above process. The help screen will help you navigate and select the program.

However, in the conventional electronic program guide deconor, in order to provide more information, the user can search only the text information and can not watch the image of the selected program during the electronic program guide. It is a defect that cannot inform the contents of.

Accordingly, an object of the present invention is to provide an electronic program guide decoder for displaying an image of a selected program on a side of the guide screen in a reduced form when the electronic program is guided.

FIG. 4 is a block diagram of an exemplary embodiment of an electronic program guide decoder of the present invention broadcasting system for achieving the above object. As shown in FIG. 4, a compressed data transmitted from the outside through a data bus is shown. The first-in, first-out 401 for storing the stream for a while, and the compressed stream from the first-in, first-out 401 is read and stored in the RAM 403, and the electronic program guide display request signal is inputted. The central processing unit 402 for transmitting the image size information supplied from the video decoder 404 to the output format control unit 405, and receives the compressed stream from the RAM 403 and receives the original video signal therefrom. A video decoder 404 which reconstructs and detects image size information, and calculates a reduced picture size information of a video based on the image size information, thereby calculating a sample rate. An output format control unit 405 for outputting a control signal to the sample rate converter 406 and for outputting position information of the reduced image to the multiplexer 409; and outputting from the video decoder 404 according to the sample rate control signal. A sample rate converter 406 for changing the sample rate of the moving image signal to generate a reduced size video signal of a specified size; and a display image buffer for storing the reduced size video signal output from the sample rate converter 406; 407, an on-screen signal generator 408 for generating an on-screen video signal according to the position and size color on the output screen using the on-screen information output from the RAM 403, and the output format control unit ( The image signal stored in the display image buffer 407 and the image signal output from the on-screen signal generator 408 by using the position information of the reduced image output from the 405. When to be configured to the multiplexer 409 for combining the output, with reference to FIG. 5 in conjunction with the accompanying action and effect of the present invention constructed as described immediately above described in detail as follows.

First, prior to the present description, FIG. 5 illustrates an embodiment of a video 501 that is displayed in a compressed form according to the present invention when guiding an electronic program. Thus, the program selected in the electronic program guide table is compressed. Referring to the process of displaying the video as follows.

The compressed stream transmitted from the outside via the data bus is temporarily stored in the first-in, first-out 401 and transferred to the RAM 403 by the central processing unit 402 to buffer the compressed stream. The video decoder 404 receives the compressed stream from the program 403 under the control of the CPU 402 and restores the original video signal therefrom.

At this time, the CPU 402 is supplied with the image size information restored from the video decoder 404. If the user wants to display the electronic program guide as shown in FIG. The size information is transmitted to the output format control unit 405.

In addition, the output format control unit 405 calculates the reduced screen size information of the moving image based on the input image size information, and outputs the result to the sample rate converter 406 side.

Accordingly, the sample rate converter 406 performs a low pass filtering and down sampling of the video signal output from the video decoder 404 to convert the sample rate, thereby reducing the size of the designated size under the control of the output format control unit 405. The video signal for the screen is generated and output to the display image buffer 407.

In addition, in order to support an image and an on-screen, the CPU 402 stores data in an on-screen format for outputting an on-screen in the RAM 403 and displays the data when an on-screen screen is to be displayed. It is read out and output to the on-screen signal generator 408.

Accordingly, the on-screen signal generator 408 uses the input on-screen information to display an on-screen video signal according to the position, size, and color of the output screen, that is, the luminance signal Y, the color difference signal Cb, and ( Cr) is generated and output to the multiplexer 409 side.

On the other hand, the multiplexer 409 is reduced by the compression process to synthesize the image signal stored in the display image buffer 407 and the image output from the on-screen signal generator 408, wherein, According to the position information of the reduced image output from the output format control unit 405, a digital image signal (Y: 4, Cb: 2, Cr: 2) synthesized from the corresponding point in time is output, which is an encoder or R. And B, G converters are converted into analog video signals and then supplied to a television receiver or monitor and displayed as shown in FIG.

Therefore, whenever a user selects a desired program from among a plurality of programs (Superman, Space Boy Atom, ...) displayed in the electronic program guide table as shown in FIG. 5, the video 501 of the program is displayed to display the selected program. You can learn more about the contents.

As described in detail above, the present invention has the effect of informing the contents of the selected program in more detail by displaying a video of the program selected by the user in a reduced form on one side of the guide screen when the electronic program is guided. have.

Claims (1)

The first-in-first-out 401 reads the compressed stream and stores the compressed stream in the RAM 403, checks that the electronic program guide display request signal is input, and outputs the image size information supplied from the video decoder 404. The CPU 402 transmits the reduced screen size information of the video based on the image size information, and outputs a sample rate control signal to the sample rate converter 406, based on the image size information. An output format control unit 405 for outputting position information of the reduced video to the < RTI ID = 0.0 >), < / RTI > A sample rate converter 406 for generating and storing the same in the display image buffer 407, and position information of the reduced image output from the output format control unit 405. And a multiplexer 409 for synthesizing the video signal stored in the display image buffer 407 and the electronic program guide video signal output from the on-screen signal generator 408. Content decoder.