KR20000004028A - Apparatus for correcting text error on teletext television - Google Patents

Abstract

PURPOSE: An apparatus for correcting text error on teletext television is provided to correct text error when multiple text broadcasting. CONSTITUTION: The apparatus comprises text image receiving means for detecting and receiving teletext in complex image signal from broadcasting station, text data decoding means for decoding text data included the teletext from the image receiving means, text data correcting means for correcting error of the text data from the text data decoding means and controlling means for controlling the text image receiving means, the text data decoding means, and text data correcting means.

Description

Text error correction device for text multicasting

The present invention relates to a device for correcting text error on Teletext Television that displays and corrects an error of text data transmitted in TELETEXT to original normal text.

In general, TELETEXT refers to news and economic news, economic industry, sports, tourism and leisure, cultural arts, life, science, women, broadcasting, securities, and special information. It refers to the transmission of digital signals in the form of digital signals during the vertical retrace period of video signals along with the broadcast programs.In broadcasting stations, various information is divided into fields and edited into a 100-page screen like a magazine. Page numbers are assigned to each screen, and then all screens are repeatedly sent out in the form of digital signals in a specified order. On the receiving side, only the signals for the page configuration desired by the viewer are sequentially displayed among the digital signals appearing only in the vertical retrace period. Collect them on the screen and the desired information will appear. Therefore, the news can not be seen in the regular program except the news time, while the text can be viewed at any time by selecting the page containing the news.

Here, the signal indicating the character multiple broadcasting will be described in detail. The character multiple broadcasting signal is a 4H period of 21H (H; one horizontal scanning period), which is a vertical retrace period, which is a period in which no image is displayed in the television signal. The character information is sent under code. In addition, the character information transmitted in the 1H (one line) period of the 4H period is 36 bytes, and the 36 bytes include a clock synchronization signal (CLOCK SYNC; CS) necessary to synchronize the clock of the broadcast signal and the receiver, and the broadcast signal. BYTE SYNC (BS) required to connect the receiver to the receiver, a PACKET ADDRESS (P1, P2, P3) indicating the magazine number (MAGAZINE), and the repetition coefficient (CONTINUITY INDEX; CI) of the data line. And a structure of the data packet (PACKET STRUCTURE (PS)), and character and graphic information (DATA BLOCK).

1 is a block diagram illustrating a conventional character multiplex broadcasting receiving system. The tuner unit 150 selects a certain channel from a high frequency signal received through an antenna 100 to display on a screen, and then the composite video signal of the channel. In addition to the high-frequency amplification process and the channel is tuned by the oscillation frequency oscillated by the oscillation frequency is converted to an intermediate frequency that is easy to amplify and then amplified to generate a composite video signal, IF amplifier connected to the tuner unit 150 ( 200 is an intermediate frequency amplified composite video signal applied from the tuner unit 150. In addition, the video signal of the composite video signal that is applied to the intermediate frequency amplified from the IF amplifier 200 is detected by the image detector 450, the switching unit after the image processing of the main image processing IC (300) Is applied to 350.

On the other hand, the character information signal mixed with the image signal output from the image detector 250 is extracted by the character extracting unit 501 in the character decoder 500 and output to the CPU 502, the CPU 502 ) Accepts and processes only the data for the interest difference display among the character information signals applied from the character extracting unit 501 and stores it in its own memory. In addition, the display unit 503 connected to the CPU 502 takes out the data stored in the memory in the CPU 502, converts the data into an analog RGB signal, and outputs the converted data to the switching unit 350 so as to display the image on the screen of the CRT 450. Causes the difference of interest to be displayed.

Here, when the difference of interest is displayed on the screen of the CRT 450, the CPU 502 is in a waiting state until a user operates a key provided in a key input unit (not shown), and the user presses a key to view a page. In this case, only the data necessary to reproduce the designated page is accepted so that the display unit 503 is displayed on the screen of the CRT 450.

In such a television, character multicasting displays a broken character on the screen of the television when a high frequency signal transmitted from a broadcasting station causes noise due to various errors. There is a problem that the device that can correct the character was not designed.

The present invention has been made to solve the above problems, an object of the present invention is to sequentially correct the character data to make a page with the same character for a certain time, so that the character errors due to various errors during the character multi-broadcast Storing and comparing the stored character data, and if it is not matched, considers other character data as error data compared to the plurality of character data among the stored data, and corrects and outputs the error data to match the plurality of character data. The present invention provides a device for correcting a text error of text multicasting.

1 is a block diagram showing a conventional text multi-broadcast reception system

2 is a block diagram for explaining a character error correction apparatus of the present invention multi-text broadcasting;

3 is a detailed block diagram of the character storage unit of FIG.

<Description of the symbols for the main parts of the drawings>

100: antenna 150: tuner

200: IF amplifier 250: image detector

300: main image processing IC 350: switching unit

400: CRT Drive 450: CRT

500: remote controller 550: microcomputer

600: video receiver 650: character decoder

700: character storage unit 700a: first storage unit

700b: second storage unit 700c: third storage unit

750: comparator 800: error correction

Hereinafter, with reference to the accompanying drawings with respect to the configuration and operation of the embodiment for achieving the object of the present invention.

2 is a block diagram for explaining a character error correction apparatus of the present invention multi-text broadcasting.

3 is a detailed block diagram of the character storage unit of FIG. 2.

Referring to FIGS. 2 and 3, the present invention oscillates when the channel is tuned in addition to amplifying a video signal of a channel selected for display on a screen among high frequency signals received through the antenna 100. A tuner unit 150 that converts the frequency into an intermediate frequency that is easily amplified by mixing with the frequency, and then amplifies and generates a composite video signal, and an IF amplifier 200 that intermediate-amplifies the composite video signal applied from the tuner 150. ), An image detector 250 extracting only an image signal from the composite image signal amplified by the intermediate frequency amplifier from the IF amplifier 200, and a video signal applied from the image detector 250. The main image processing IC 300 applied to the switching unit 350 to be displayed on the CRT 450 and the image signal applied from the image detector 250 according to the control signal of the microcomputer 550. A text decoder which extracts only a text (TELETEXT) signal included in the received video receiver 600 and the video signal output from the video receiver 600, and displays them on the screen of the CRT 450 ( 650 and a text storage unit 700 that stores three frames using a text signal that is output from the text decoder 650 to form one screen frame as a unit, and the text storage unit 700. A first storage unit 700a, a second storage unit 700b, a third storage unit 700c, and the first storage unit, each of which constitutes a unit 700 and stores character data for one screen frame, respectively. A comparator 750 for comparing the character data stored in the unit 700a, the second storage unit 700b, and the third storage unit 700c with each other and applying the result to the microcomputer 550 when the character data does not match. As a result of the comparator 750, the stored character data are mutually different. If it does not match, the error correction unit 800 corrects one error character data with two correct character data and a control signal is applied to the image receiver 600 to obtain an image signal from the image detector 250. A text storage unit 700 to control a text decoder 650 to extract a text signal from the received video signal, and to correct an error of the text signal output from the text decoder 650. By the microcomputer 550 for controlling the error correction 800, a remote controller 500 for applying a command for selecting the user's character reception broadcast to the microcomputer 550, and the error correction 800 The switching unit 350 is switched to the CRT drive 400 so that the corrected text data can be output to the screen, and the CRT 450 is displayed by the CRT drive 400 as an image.

With reference to the accompanying drawings will be described in detail the operation of an embodiment of the present invention made of a configuration as described above.

Referring to the accompanying drawings and described, the high frequency signal received from the antenna 100 is selected by the tuner 150, the intermediate frequency amplified through the IF amplifier 200, and then the image detector 250 Only the video signal is detected and output to the main video processing IC 300. Here, when the user generates a text switching signal by operating the TV / TEXT key provided in the remote controller 500, the microcomputer 550 detects this and then applies a switching control signal to the switching unit 350 to normalize it. The television broadcast signal is blocked, and the image receiving unit 600 receives the text multicast signal from the image detector 250 under the control of the microcomputer 550. The text multicast signal received by the image detector 250 is applied to the text decoder 650 to extract only the text signal included in the text multicast signal. The text data extracted from the text decoder 650 is stored in the text storage unit 700.

The process of correcting the error data when the text data extracted from the text decoder 650 is stored and the stored text data is error data will be described in detail with reference to FIG. 3.

The text data extracted by the text decoder 650 is sequentially stored in three storage units based on one frame unit. That is, one frame of the extracted text data is stored in the first storage unit 700a, and when the next frame is extracted from the text decoder 650 with the passage of time, the sun frame stored in the first storage unit 700a. Data is applied to the second storage unit 700b, and the next frame data is stored in the first storage unit 700a. Similarly, when the third text data is applied to the first storage unit 700a as time passes, the second text data stored in the first storage unit 700a is applied to the second storage unit 700b. The first character data stored in the second storage unit 700b is applied to the third storage unit 700c, and if the fourth character data is applied to the first storage unit 700a, the first character data stored in the second storage unit 700b is stored in the third storage unit 700c. The first character data is displayed on the CRT 450 via the switching unit 350. While the data is stored in the above process, the comparator 750 compares the data stored in the first storage unit 700a, the second storage unit 700b, and the third storage unit 700c. When the comparator 750 checks the error data, the text image displayed in the text multicast is displayed for a considerable time for each page. Therefore, the text data displayed during the time is not different. That is, in the high frequency signal continuously received, the character data has the same data value for a considerable time. If an error occurs in the text data due to an error, an error such as a broken phenomenon may occur in the text image for a while while the error occurs. For example, when a certain time screen is displayed with the same character, if the character data forming one frame is '000111', the data of '000111' is continuously output for a considerable time. In this case, when an error data is applied, one frame may be '000110'. However, the error data may be regarded as '000110'. This is because one text image is continuously displayed for a certain time, so that one other data that is not continuous and sudden may not be correct data.

When the character data forming one frame is sequentially applied to the first storage unit 700a, the second storage unit 700b, and the third storage unit 700c as described above, the comparator 750 stores the stored data. Compared with each other, and if the data is different, the result is applied to the microcomputer 550. The microcomputer 550 receiving the result of the comparator 750 corrects the error data by controlling the error correction unit 800. In the above description, when the stored data is '000110' in the first storage unit 700a, '000111' in the second storage unit 700b, and '000111' in the third storage unit 700c, The government 800 considers the '000110' as error data and corrects the data by replacing the data with data of '000111' stored in the remaining two storage units. The reason why the '000110' is regarded as the error data is that the character data during the display of one character image is generally matched as described above, and the non-continuous and unexpected data can be regarded as the error data. .

Character data corrected by the error correction unit 800 is displayed on the CRT 450 via the switching unit 350, respectively.

Through all the above processes, the text error correction apparatus of the text multicast is implemented as the present invention intends.

As can be seen from the above description, the present invention sequentially stores the text data making one page with the same text for a predetermined time, so that text errors caused by various errors can be corrected during text multicasting, and the stored text data Compared with, if it does not match, the character data that can be generated by an external element by correcting the error data to match the plurality of character data by considering the other character data as error data compared to the plurality of character data of the stored data The effect of correcting the error of the data itself is effective.

Claims (3)

In a television having a text multicast function for receiving a text multicast transmitted by a broadcasting station and displaying the text multicast, A text image receiving means for detecting and receiving a text multicast from a composite video signal received from a broadcasting station; Text data decoding means for extracting text data included in text multicasting received by said text image receiving means; Character data correction means for correcting errors of character data output by said character data decoding means; Character error correction apparatus of the character multiple broadcasting comprising a control means for controlling all the above means. The method of claim 1, wherein the character data correction means, A text storage unit 700 which receives a text signal output from the text decoder 650 and stores a plurality of frames using a text signal to form one screen frame as a unit; A comparator 750 for comparing the character data for each frame stored in the character storage unit 700 with each other and applying the result to the microcomputer 550 when the text data does not match each other; When the stored character data does not coincide with each other as a result of the comparator 750, an error correction unit 800 for correcting a small number of error character data with a plurality of correct character data is characterized in that Text error correction device. The method of claim 2, wherein the character storage unit, When storing N frames, each of the Nth storage unit, the N-1th storage unit, the N-2th storage unit,.. ......., the third storage unit, the second storage unit, and the first storage unit Comprising one storage unit, the method is stored in the storage unit character error correction apparatus for character multiple broadcasting, characterized in that the storage is sequentially stored in each frame unit in ascending order or descending order.