JPH06217224A - Character teletext display system - Google Patents

Abstract

PURPOSE:To extract a teletext signal superposed on a television broadcast signal, and to convert it into braille and display them. CONSTITUTION:A tuner part 1 receives the television broadcast and demodulates it into a composite video signal, and a character extraction part 2 extracts the teletext signal, which is recorded in a memory part 4 after error correction by an error correction part 3. Data in the memory part 4 are read out through a control part 12 and decoded by a decoding part 5 into a character signal, and KANJI(Chinese character)-KANA(Japanese syllabary) mixed characters are converted into a KANA character signal by using a KANJI reading dictionary 6; and the signal is displayed in KANA on a screen through a character display part 7 and also inputted to a discriminating part 9 at the same time. Data read out of a storage part 8 through the control part 12 are inputted to the decision part 9 and the braille corresponding to the character signal from the KANJI reading dictionary 6 are discriminated. A braille driving part drives a braille display part 11 according to the signal from the decision part 9 to generate and display the braille corresponding to the character signals.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a teletext display system, and more particularly to a system for extracting teletext signals of television broadcasting and displaying them in Braille.

[0002]

2. Description of the Related Art In television broadcasting, mainly for people who are deaf, character information for explaining program contents is generated in a required character broadcasting signal and superposed on a composite video signal for broadcasting. However, some teletext receivers can display it on the screen during image reception if they are received. Further, for visually impaired persons, there is a program in which a commentary of the program is broadcast by a sub-audio of the audio multiplex broadcasting. However, visually impaired persons may find it difficult to use character information by teletext, and hearing impaired persons may not be useful with sub-audio that is broadcast by voice multiplexing.

[0003]

SUMMARY OF THE INVENTION In view of the above, the present invention extracts a character broadcast signal which is broadcast by being superimposed on a composite video signal of a television broadcast, decodes it into a required character signal, and then outputs a Chinese character. An object of the present invention is to provide a device which converts mixed character signals into kana character signals, determines braille corresponding to each character from prestored data, and drives a braille display unit to display in braille.

[0004]

In order to solve the above-mentioned problems, the present invention receives a television broadcast, demodulates it into a composite video signal, extracts a teletext signal, corrects an error, and then performs a desired text signal. A teletext signal extraction / decoding unit for decoding to, a Kanji reading dictionary for converting a character signal mixed with Kanji from the teletext signal extraction / decoding unit to a kana character signal, and Braille data corresponding to the kana character signal. A storage unit for storing the information, a determination unit for determining the Braille corresponding to the character signal from the Kanji reading dictionary by the data read from the storage unit, a Braille display unit for displaying the Braille, and a signal from the determination unit. A character broadcast composed of a Braille drive unit for driving a Braille display unit based on the above, a character broadcast signal extraction / decoding unit, a Kanji reading dictionary, a storage unit, a discrimination unit, a Braille display unit, and a control unit for controlling the Braille drive unit. Display system It is intended to provide.

[0005]

With the above construction, in the teletext display system according to the present invention, a teletext signal is extracted from a television broadcast signal and decoded into a required text signal, and then a kanji mixed sentence is converted into a kana text signal. And the Braille corresponding to this character signal is discriminated by the data read from the storage unit, and the Braille drive unit drives the Braille display unit to generate Braille. As a result, it becomes possible to convey the contents of the television program etc. in Braille to the visually impaired person and the like.

[0006]

Embodiments of the teletext display system according to the present invention will be described in detail below with reference to the drawings. FIG. 1 is a block diagram of essential parts of an embodiment of a teletext system according to the present invention. In the figure, reference numeral 1 denotes a tuner section that receives a television broadcast, demodulates it into a composite video signal, and outputs it. A character extracting unit 2 extracts a character broadcast signal superimposed in the vertical blanking period from the composite video signal demodulated by the tuner unit 1. An error correction unit 3 corrects the error of the teletext signal extracted by the character extraction unit 2. Reference numeral 4 denotes a memory unit for recording the teletext signal from the error correction unit 3. A decoding unit 5 reads the data recorded in the memory unit 4 and decodes it into a desired character signal. A kanji reading dictionary 6 converts a kanji mixed character signal from the decoding part 5 into a kana character signal. A character display unit 7 displays kana characters based on the character signals converted into kana by the kanji reading dictionary 6. A storage unit 8 stores Braille data in association with a character signal. A discrimination unit 9 discriminates the Braille corresponding to the character signal from the Kanji reading dictionary 6 based on the data read from the storage unit 8. A Braille drive unit 10 drives the Braille display unit 11 based on a signal from the discrimination unit 9. As shown in FIG. 2, the Braille display unit 11 arranges a required number of characters (one character for each of the dakuten and the semi-dakuten) made up of six points in three lines and two lines in a horizontal row, and each point of each character is displayed. It is driven by the Braille driving unit 10 and the corresponding protrusion 21 is projected to generate Braille. A control unit 12 controls each unit.

Next, the operation of the teletext display system according to the present invention will be described. The tuner section 1 receives a television broadcast signal and demodulates it into a composite video signal. The composite video signal from the tuner unit 1 is input to the character extracting unit 2 and the character broadcasting signal superimposed in the vertical blanking period is extracted. The extracted teletext signal is recorded in the memory unit 4 after being subjected to required error correction by the error correction unit 3. The character broadcast signal recorded in the memory unit 4 is read out via the control unit 12, input to the decoding unit 5, and decoded into a required character signal. In many cases, this character signal is a character signal in which Chinese characters and the like are mixed, so it is input to the Kanji reading dictionary 6 via the control unit 12 and converted into a kana character signal.

A character signal converted into a kana character via the kanji reading dictionary 6 is input to the character display portion 7 via the control portion 12 and displayed on the screen in kana characters. This is to enable a healthy person to read the kana characters on the screen to help when the reading of braille is insufficient. At the same time, the character signal converted into the kana in the Kanji reading dictionary 6 is input to the determination unit 9 via the control unit 12 and compared with the Braille data read from the storage unit 8 via the control unit 12 to determine each character signal. Braille corresponding to. Then, based on the signal from the discrimination unit 9, the Braille drive unit 10 drives the Braille display unit 11 via the control unit 12 to generate and display the Braille.

The Braille display unit 11 has six-point projections driven by the Braille drive unit 10 to be projected / retracted in three lines and two rows to form one Braille line, which is required in one horizontal line as shown in FIG. Several braces are provided, and the required protrusions are driven to be projected by the braille drive unit 10 to generate Braille. These protrusions are made of, for example, a rod-shaped soft iron material whose head is formed in a smooth hemispherical shape, and are configured to drive these members to project / retract by a magnetic field based on a signal from the Braille driving unit 10. To do. As a result, the character by the teletext signal is generated and displayed in Braille.

[0010]

As described above, according to the teletext display system of the present invention, the teletext signal superimposed on the television broadcast signal is generated and displayed in Braille, so that the visual sense is impaired. Even people who understand it can understand the contents of television programs in Braille.

[Brief description of drawings]

FIG. 1 is a block diagram of a main part of an embodiment of a teletext display system according to the present invention.

FIG. 2 is an example of Braille display in the teletext display system according to the present invention.

[Explanation of symbols]

 1 Tuner section 2 Character extraction section 3 Error correction section 4 Memory section 5 Decoding section 6 Kanji reading dictionary 7 Character display section 8 Storage section 9 Discrimination section 10 Braille driving section 11 Braille display section 12 Control section

Claims (2)

[Claims] 1. A teletext signal extraction / decoding unit that receives a television broadcast, demodulates it into a composite video signal, extracts the teletext signal, corrects the error, and then decodes the teletext signal into a desired text signal.
A kanji reading dictionary that converts a kanji mixed character signal from the teletext signal extraction / decoding part into a kana character signal, and a storage part that stores braille data in association with the kana character signal.
A discriminating unit that discriminates Braille corresponding to a character signal from the Kanji reading dictionary based on the data read from the storage unit, a Braille display unit that displays Braille, and a Braille display unit that is driven based on the signal from the discriminating unit. A teletext display system including a Braille driving unit, a teletext signal extraction / decoding unit, a Kanji reading dictionary, a storage unit, a determination unit, a Braille display unit, and a control unit that controls the Braille driving unit. 2. The teletext display system according to claim 1, further comprising a character display section for displaying a character based on a signal from said discriminating section.