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| My copending application U.S. Ser. No. 770,192, filed Feb. 18, 1977 entitled "Apparatus for P... |
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Method and apparatus for providing dual language captioning of a television program
| Details |
Inventors: Salomon, Amnon M.; Faust, Anthony M.;
Assignee: National Captioning Institute, Inc. (Vienna, VA)
Primary Examiner: Harvey; David E.
Assistant Examiner:
Attorney, Agent or Firm: Banner & Allegretti, Ltd.
A method of decoding data for a language having the Roman alphabet or a language having a syllabic alphabet from a television data stream includes the steps of receiving the data in the form of data packets and determining from bit values stored at particular bit positions whether the data is control data or represents printable character data comprising a head code or a tail code. Once it is determined that the data represents either a head code or a tail code of a printable character, the data bytes are valued for parity and, from that determination, a letter component is generated which points to a letter component or complete character for one or the other alphabet. Because characters of a syllabic language may be quite complex, the step of displaying the syllabic language character includes the steps of overlaying two or more letter components to form the syllabic character image. |
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DETAILED DESCRIPTION Thus, it is a general object of the present invention to provide means for recording, encoding, transmitting, receiving, decoding, and displaying recordable sounds of various languages, for example, for providing captioning, text or other services such that alphabetic, numeric and other characters of a syllabic language, consistent with known formats for encoding Roman alphabetic, numeric, musical note and other characters of a language such as English, French, German or Spanish for transmission, may eventually be displayed on a viewer's screen.
Thus, it is also a general object to provide both Roman and syllabic alphabet captioning for display on an associated television signal receiver, telecommunications device or other apparatus for displaying the spoken word.
In order to accomplish these general objects, it is a specific object of the present invention to provide a method and apparatus for encoding and decoding the Roman and syllabic alphabets in a manner for transmission and reception in high definition television formats or on a single line of the vertical blanking interval of a television signal.
It is a further specific object of the present invention to determine an appropriate character and caption size for display on a standard resolution television set to enable a syllabic alphabet character and caption comprising the characters to be readable on a standard resolution color television screen and to further extend the principles of the present invention to enhanced or high definition television or telecommunications receivers as they become more commercially and widely available.
It is a still further object of the present invention to extend the principles of the present invention to the display of caption, text or other services in ideographic languages such as Japanese and Chinese.
In accordance with the present invention, a method of encoding syllabic alphabetic or numeric characters provides for transmitting four bytes of syllabic language data at a particular line of alternating fields of a standard, enhanced or high resolution NTSC, PAL, SECAM, MUSE, high definition television signals or other television or telecommunications signals
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TV Signal 
