JPH0580738A - Automatic teletext character conversion device - Google Patents

Abstract

PURPOSE:To enable character expressions really matching respective languages and friendly respondence by providing a conversion character ROM in addition to a standard teletext decoder and converting only corresponding characters. CONSTITUTION:The automatic teletext character conversion device 25 consists of a teletext signal variation judging unit 9, an SW (1) 11, a page memory (1) 12, an SW (2) 13, a character judging unit 14, the conversion character ROM 15, an SW (3) 16, a page memory (2) 17, and an SW (4) 19. Then the character judging unit 14 recognizes which language character data of the page are in with a page select signal 2 and select the conversion character ROM matching the page. Characters are judged, one by one, and when one character needs to be converted specially, the character data signal 7 is made into another converted character conversion data signal 18 through the conversion character ROM 15.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a teletext automatic character conversion device in a teletext decoder for decoding a teletext signal.

[0002]

2. Description of the Related Art Conventionally, a language of each country has been expressed in a subtitle supermarket of a movie in Europe or the like by using a teletext signal. However, in each country, a few characters or a dozen or more characters always have special characters, and the character ROM possessed by an ordinary teletext decoder could not sufficiently cope with them.

A conventional technique will be described with reference to FIG.

The teletext signal superimposed on the V period of the video signal 31 becomes the teletext data signal 33 by the teletext signal extracting device 32, and the character corresponding to the teletext data signal 33 is obtained by the teletext data character converter 34. The data signal 35 is stored in the page memory (1) 36 through the teletext data character converter 34 as one screen of character data signal 35. The character data signal 35 is converted into a character luminance signal 38 and a blanking signal 39 through a character signal output device 37, superposed via a mixer 40 during the H period of the video signal 31, and outputted as a composite signal 41. 42 is a character ROM.

[0005]

At present, in the teletext decoder, the control signal sent from the transmitting side is used.
With (3 bits), etc., it is possible to convert a certain dozen or more characters from the character ROM according to the character of each country. Some characters require special conversion characters. However, it is not possible to prepare different character ROMs for each. In the current situation,
We can't back up to that level, and we're not giving real satisfaction to the locals in each country.

Specifically, in Europe, for example, Swedish, Danish, Norwegian, and Finnish are all replaced by Swedish. But in reality, 11 letters, two letters in Finnish, and more choice of letters.

The object of the present invention is to solve the conventional drawbacks and to use the IC of the present generalized teletext decoder, and to present the currently limited linguistic expressions, one character by one character, respectively. It is an object of the present invention to provide a teletext character conversion device capable of providing a language expression suitable for each country.

[0008]

The teletext character conversion device of the present invention has a conversion character ROM in addition to a standard teletext decoder, and can freely perform character conversion only for the corresponding character of the corresponding national language. It is possible.

[0009]

According to the present invention, it is possible to perform a character expression that really suits each national language and provide a friendly correspondence.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIG. In the same figure, the teletext signal in which each page superimposed in the V period of the video signal 1 is in the language of a fixed country is selected by the teletext signal extracting device 3 according to the page selection signal 2 so that only the necessary pages are displayed. It becomes the teletext data signal 4. The teletext data signal 4 is sent to the character ROM 6 via the teletext data character converter 5 and converted into a character data signal 7 suitable for the data. Teletext data signal converter 5 Teletext data signal conversion completion signal 8
Is output.

The teletext automatic character conversion device 25 comprises a teletext signal change judging device 9, a SW (1) 11, a page memory.
(1) 12, SW (2) 13, character judge 14, conversion character R
It is composed of OM15, SW (3) 16, page memory (2) 17, and SW (4) 19.

The teletext signal change judging device 9 first outputs the switch control signal 10 and turns on the SW (1) 11 to the page memory (1) 12. The character data signal 7 for only the necessary pages made by the teletext data character converter 5 is stored in the page memory (1) 12. Next, SW (2) 13 is turned on to the page memory (1) 12 side similarly. Then, the character data signal 7 of the page memory (1) 12 is input to the character judging device 14. The character determiner 14 recognizes in which country's language the character data is based on the page selection signal 2, and selects the conversion character ROM 15 suitable for the page. And then we judge each character one by one, and if that character needs special conversion,
Convert character data signal 7 Character ROM15
Another character conversion data signal 18 converted via
And Of course, a large number of conversion character ROMs 15 may be prepared for each page (country).

Further, the conversion character ROM 15 prepares not only special character data to be converted but also character data which does not need to be converted therein, and all characters other than special characters are reconverted via the conversion character ROM 15. You can also do it.

Next, the SW (3) 16 is turned on to the page memory (2) 17 side, and also includes the character conversion data signal 18 converted by the character determiner 14 and the conversion character ROM 15.
The character data signal 7 for one page (one screen) of the page (that language) is stored in the page memory (2) 17.

Then, when the SW (4) 19 is turned on to the page memory (2) 17 side, the page (that language) including the converted character data signal 7 in the page memory (2) 17 is also included.
The character data signal 7 for one page (for one screen) is converted into the blanking signal 21 and the character luminance signal 22 through the character signal output device 20, and the respective signals are inserted in the H period of the video signal by the mixer 23. , Composite signal 24.

In such a series of operations, the teletext signal change judging device 9 first turns on the SW (1) 11 to the page memory (1) 12 side, and turns the SW (2) 13 on to the page memory (1) 12 side. Side, switch SW (3) 16 to page memory (2) 17 side,
The SW (4) 19 is turned on to the page memory (2) 17 side.

This control is carried out by the teletext data character converter 5 to the next teletext data signal conversion completion signal 8
Is input to the teletext signal change judging device 9, SW
(1) 11 is turned on to page memory (2) 17 side, SW (2) 13 is turned on to page memory (2) 17 side, and SW (3) 16 is turned to page memory
The teletext signal change judging device 9 outputs the switch control signal 10 so that the (1) 12 side is turned on and the SW (4) 19 is turned on to the page memory (1) 12 side. This operation is a toggle format, and it doesn't matter which one starts the initial operation.

[0018]

With the present generalized teletext decoder IC, the present invention allows a limited linguistic expression to be made into a linguistic expression in which each character is suitable for each country according to the present invention. , Its practical effect is extremely large.

[Brief description of drawings]

FIG. 1 is a block diagram of a teletext automatic character conversion device according to an embodiment of the present invention.

FIG. 2 is a block diagram of a conventional teletext character conversion device.

[Explanation of symbols]

1 ... Video signal, 2 ... Page selection signal, 3 ... Teletext signal extracting device, 4 ... Teletext data signal,
5 ... Teletext data character converter, 6 ... Character ROM, 7 ... Character data signal, 8 ... Teletext data signal conversion completion signal, 9 ... Teletext signal change judging device, 10 ... Switch control signal,
11 ... SW (1), 12 ... Page memory (1), 13 ... SW
(2), 14 ... Character judge, 15 ... Conversion character RO
M, 16 ... SW (3), 17 ... Page memory (2), 18 ... Character conversion data signal, 19 ... SW4, 20 ... Character signal output device, 21 ... Blanking signal, 22 ... Character luminance signal, 23 ... Mixed Instrument, 24 ... Composite signal, 25 ...
Teletext automatic character converter.

Claims (5)

[Claims] 1. A teletext decoder using a teletext signal superimposed in a vertical period of a video signal, wherein a teletext signal extracting device, a teletext data character converter and a character R are extracted from the teletext signal.
As a page memory for storing the character data signal converted via the OM for one page (one screen), there is a page memory 2 having the same contents as the page memory 1, and the teletext data character converter Input the teletext data signal conversion completion signal and switch each SW1, S
A switch control signal is output to W2, SW3 and SW4, a teletext signal change judgment device for controlling each and a page selection signal are input, and a conversion character ROM for conversion is selected according to the signal, and the page memory is also selected. 1 or the character data signal of the page memory 2 is input through the SW2, collated with the selected conversion character ROM, and the character data signal is converted and converted as a character conversion data signal through the SW3. A character determiner for outputting to page memory 1 or page memory 2 and a conversion character RO that stores the character conversion data signal
Input the character conversion data signal output from the page memory 1 and the page memory 2 into which the character conversion data signal is input via the SW3 by M (this is not limited to one type) and the character determiner. An automatic teletext character conversion device comprising a SW4 for outputting the character conversion data signal to a character signal output device in accordance with a switch control signal from the teletext signal change judging device. 2. The SW1 comprises a switching device for inputting a character data signal and outputting the character data signal to the page memory 1 or the page memory 2 in accordance with a switch control signal from the teletext signal change judging device. The automatic teletext character conversion device according to claim 1, characterized in that. 3. The SW2 receives the character data signal output from the page memory 1 and the character data signal output from the page memory 2 and outputs either one of them according to a switch control signal from a teletext signal change judging device. The teletext automatic character conversion device according to claim 1, characterized by comprising a switching device for outputting to a character judgment device. 4. The SW3 inputs the character conversion data signal output from the character judging device, and outputs the character conversion data signal to the page memory 1 or the page memory 2 according to the switch control signal from the teletext signal change judging device. 2. The automatic teletext character conversion device according to claim 1, further comprising a switching device for outputting. 5. The SW4 receives the character conversion data signal output from the page memory 1 and the page memory 2 and outputs the character conversion data signal to a character signal output device according to the switch control signal from the teletext signal change judging device. The teletext automatic character conversion device according to claim 1, characterized in that the automatic text conversion device comprises a switch for outputting to.