Television – Basic receiver with additional function – For display of additional information
Reexamination Certificate
1997-05-05
2001-07-03
Eisenzopf, Reinhard J. (Department: 2614)
Television
Basic receiver with additional function
For display of additional information
C348S461000, C348S465000, C348S468000, C348S476000, C348S478000, C348S473000
Reexamination Certificate
active
06256072
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a closed-caption broadcasting and receiving method and apparatus thereof, and more particularly, to a closed-caption broadcasting and receiving method and the apparatus thereof, whereby character and control codes are encoded in a television signal to be transmitted as a caption broadcasting signal, and then received to be displayed on a screen of a television receiver by selection of a viewer.
2. Description of the Related Art
The caption broadcasting system in television broadcasting can be classified into an open caption system for displaying a caption of emergency news, announcements, etc., on a television screen by selection of a broadcaster by superimposing the caption signal in an active period of a television signal, and a closed caption system for displaying a caption of words on the screen by selection of a viewer by encoding the caption signal in a non-active period, i.e., in a vertical blanking interval of the television signal.
The closed-caption broadcasting has been carried out in the United States since 1978 for people who have difficulty in hearing and cannot recognize the words of the scene without sign language. The closed-caption broadcasting is also useful in studying a foreign language.
The U.S. Pat. No. 5,294,982 issued on March, 1994 discloses a closed-caption broadcasting system suitable for displaying Roman characters and syllable characters. Especially, captioning of the syllable characters such as Korean is explained in detail in this patent. According to this patent, in order to broadcast Hangul (Korean alphabet) as a closed-caption, one Hangul character is separated into initial, medial, and final consonant phonemes and ASCII (American Standard Code for Information Interchange) codes corresponding to the respective consonant phonemes are transmitted. In a receiving part, the ASCII codes are received and decoded, and then the initial, medial, and final consonant phonemes are mapped to form and display the Hangul character.
However, according to this conventional Hangul closed-captioning system, since at least two or three bytes of data should be used for representing one Hangul character, the transmission speed and the display speed thereof become lowered. Also, its decoding process becomes complicated because the position of one Hangul character is searched by combination of three or four bytes of data, causing the cost of a caption decoder to increase.
Also, the conventional Hangul closed-captioning system has difficulty in simultaneously displaying Chinese characters, Hangul, and Japanese, and in simultaneously displaying English, Russian and Greek, as well as in displaying special symbols.
Also, since a control code is required in case of displaying word information between additional information and then displaying additional information again, there is no independence between the word information and additional information, and the control system for discriminating a display mode of the word information becomes complicated. If the display mode control code is not received at the start point of the receiving device's operation, the word information cannot be displayed until a next control code is received.
Further, since the conventional system has been developed based on the television broadcasting environment in the United States, it shows an inferior receiving state in the geographic setting of Korea that has mountainous districts over 70%, thereby deteriorating the quality of the caption display.
Meanwhile, related arts regarding the closed-caption broadcasting and receiving apparatuses are disclosed in U.S. Pat. Nos. 5,327,176, 4,310,854, 5,347,365, 5,249,050, 5,374,960, and 5,315,386, and Japanese Patent Laid-open Nos. 6-165065 and 6-165064.
SUMMARY OF THE INVENTION
It is an object of the present invention to solve the problems involved in the prior art, and to provide a closed-caption broadcasting and receiving method and the apparatus thereof which can effectively transmit and receive additional information in the closed-caption broadcasting of syllable characters such as Hangul.
In one aspect of the present invention, there is provided a closed-caption broadcasting method which comprises the steps of inputting additional information; checking whether or not word information is inputted; selecting the word information if it is checked that the word information is putted, while selecting the additional information if it is checked that the word information is not inputted; inputting character information and control information of the selected information; producing a control code of two words by combining the control information with a mode control bit and a parity bit, and a character code of two words including a syllable character completion type code by combining the character information with a mode control bit and a parity bit; outputting a digital-modulated caption signal by inputting the control code and the character code; and coding the caption signal in at least one line which does not affect a television image signal to transmit the caption signal.
In another aspect of the present invention, there is provided a closed-caption broadcast receiving method which comprises the steps of detecting horizontal and vertical sync signals of a received television signal; extracting a caption signal encoded in a last scanning line by counting the horizontal sync signal in response to the detected vertical sync signal; restoring digital data from the extracted caption signal; detecting an error of the restored data; decoding a control code of the data and discriminating whether a data code corresponds to additional or word information; storing the decoded character code in an additional information memory if the data code corresponds to the additional information, while storing the decoded character code in a word information memory if the data code corresponds to the word information; reading out the character code from the corresponding memory in response to selection of the caption word/additional information mode and reading out character data by addressing a font ROM (read only memory) wherein the character data based on a syllable character completion type code is stored according to the read-out character code to store the read-out character data to a display memory; and converting the character data stored in the display memory into a video signal to display the video signal on a display screen in response to the decoded control information.
In still another aspect of the present invention, there is provided a closed-caption lo broadcasting apparatus for superimposing closed-caption information in a video signal and modulating an audio signal and the video signal to a television signal to transmit in the air the modulated television signal as a high frequency signal, the apparatus comprising word information input means for inputting word information related to a television scene; additional information input means for inputting additional information not related to the television scene; word information detecting means for detecting whether or not the word information is inputted; switching means for selecting one of the word information and the additional information in response to a detected signal of the word information detecting means; character information input means for inputting the word information or the additional information selected by the switching means as a 2-byte syllable character completion type code; control information input means for inputting 7-bit control information for reception control of a closed-caption broadcast; character code generating means for generating a data packet of an 18-bit character code by using the MSB (most significant bit) of each byte of the 2-byte syllable character completion type code as a caption word/additional information flag, replacing the MSB by “O” in case of the additional information, and adding a parity bit to each byte; control code generating means for generating a data pack
Bae Jum-Han
Han Sang-Rok
Kim Sang-Jin
Yang Jin-Hwa
Eisenzopf Reinhard J.
Lo Linus H.
Samsung Electronics Co,. Ltd.
Staas & Halsey , LLP
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