Closed-caption broadcasting and receiving method and apparatus suitable for syllable characters

A closed-caption broadcast receiving method comprising the steps of:

• detecting a sync signal of a received television signal;
• extracting a caption signal encoded in a scanning line of said television signal in response to said detected sync signal;
• restoring digital data from said extracted caption signal;
• detecting for an error of said restored data;
• storing in a first RAM (random access memory) first data of an odd field of said error-detected data, and storing in a second RAM data of an even field of said error-checked data;
• reading out one of said first and second data from a corresponding one of said first and second RAMs;
• decoding a control code and a character code from said read out first or second data, reading out character data corresponding to said character code from a font ROM (read only memory), wherein said character data is stored in said font ROM based on a syllable character completion type code, and storing said read out character data in a display memory;
• and
• converting said character data stored in said display memory into a video signal in response to said decoded control information, to display said video signal on a display screen.

A closed-caption broadcasting method, comprising the steps of:

• receiving first language control information and character information indicative of a first language and second language control information and character information;
• producing a first language control code of two words by combining said first language control information with a first mode control bit and a first parity bit, a first language character code of two words including a syllable character completion type code by combining said first language character information with a second mode control bit and a second parity bit, a second language control code of two words by combining said second language control information with a third mode control bit and a third parity bit, and a second language character code of two words including said syllable character completion type code by combining said second language character information with a fourth mode control bit and a fourth parity bit;
• and
• coding said first language control and character codes into an odd field channel of a television image signal and coding said second language control and character codes into an even field of said television image signal.

A closed-caption receiving method, comprising the steps of:

• detecting horizontal and vertical sync signals of a received television signal;
• extracting a caption signal encoded in said television signal by counting said horizontal sync signal of said received television signal in response to said vertical sync signal of said received television signal;
• storing in a first memory said caption signal in an odd field channel of said received television signal as first data of a first language, and storing in a second memory said caption signal in an even field channel of said received television signal;
• decoding a first language control code of said first data read out from said first memory or a second language control code of said second data read out from said second memory, decoding a first language character code from said read out first data or a second language character code from said read out second data;
• determining whether said second language character code is one of a plurality of registered languages if said second data is read out from said second memory;
• reading out character data corresponding to said read out first language character code if said first language character code is read out from said first memory, reading out character data corresponding to said read out second language character code if said second language character code is read out from said first memory and said second language character code is one of said plurality of registered languages;
• storing said read out character data in a third memory;
• and
• converting said character data stored in said third memory into a video signal to display said video signal on a display screen.

A closed-caption broadcasting apparatus to encode caption information in a television image signal, comprising:

• a character information input unit to receive first language control information and character information indicative of a first language and second language control information and character information;
• a caption producing unit to produce a first language control code of two words by combining said first language control information with a first mode control bit and a first parity bit, a first language character code of two words including a syllable character completion type code by combining said first language character information with a second mode control bit and a second parity bit, a second language control code of two words by combining said second language control information with a third mode control bit and a third parity bit, and a second language character code of two words including said syllable character completion type code by combining said second language character information with a fourth mode control bit and a fourth parity bit;
• and
• an encoder to code said first language control and character codes into an odd field channel of said television image signal and to code said second language control and character codes into an even field of said television image signal.

A closed-caption receiving apparatus for receiving caption information from a received television signal, comprising:

• a sync separator to detect horizontal and vertical sync signals of said received television signal;
• a data extractor to extract a caption signal encoded in said television signal by counting said horizontal sync signal of said received television signal in response to said vertical sync signal of said received television signal;
• a memory unit;
• and
• a caption control unit to store in said memory unit said caption signal in an odd field channel of said received television signal as first data of a first language, to store in said memory unit said caption signal in an even field channel of said received television signal, to decode a first language control code of said first data read out from said memory unit and a second language control code of said second data read out from said memory unit, to decode a first language character code from said read out first data and a second language character code from said read out second data, to determine whether said second language character code is one of a plurality of registered languages if said second data is read out from said memory unit, to read out character data corresponding to said read out first language character code if said first language character code is read out from said memory unit, to read out character data corresponding to said read out second language character code if said second language character code is read out from said memory unit and said second language character code is one of said plurality of registered languages, to store said read out character data in said memory unit, and to convert said character data stored in said memory unit into a video signal for display of said video signal.