216
1
Type1,2,3 ( AGC only )
2 VHS
MENU
Display returns to the initial screen.
6.2 Closed caption/V-Chip
6.2.1 Description and specifications
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What is “closed caption (CC)”?
Closed captioning was developed in the United States, and it provides broadcasts with subtitles for the hearing impaired so
that people who are deaf or hard of hearing can enjoy movies and news programs.
The captions are “closed” in the sense that they are not displayed on the screen during normal playback. Conversely, the
Japanese-language subtitles and other such characters used with video content that is “burned into” the images from the start
are referred to as “open captions.”
Although closed captioning was originally developed as a technology for the hearing impaired, it is currently attracting the
attention of educators and language learners as a tool which helps develop “listening.”
The CC subtitle data is superimposed onto line 21 (first field) and line 284 (second field) of the NTSC output signals, and
output. The subtitle data has two modes, captions and text. Another available service is the Extended Data Service (EDS),
which transmits titles, ratings and other program information using line 284 (second field). The V-Chip described below uses
the EDS function.
A total of 32 characters can be displayed per line by CC. There are 15 lines, but the maximum number of lines is limited to 4
in the caption mode (CC1 to 4). All 15 lines can be displayed in the text mode (T1 to 4).
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What is the “V-Chip”?
The V-Chip refers to a semiconductor chip that blocks out TV programs containing violence and sexual situations. “V” refers
to violence, and the viewing of programs is blocked out according to the ratings that are categorized by the extremity of the
program content. Once the ratings are set in a receiver (TV set) that incorporates the V-Chip function, the rating information of
EDS is decoded, and whether the programs are to be output to the screen is automatically determined.
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Specifications of closed caption/V-Chip
Closed caption/V-Chip supports the TV signals of the following systems.
Closed caption/V-Chip is superimposed onto the composite signals and Y/C signals.
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NTSC-M, NTSC-J, NTSC-443
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PAL-60, PAL, PAL-M, PAL-Nc
* However, in a 625-line system (PAL, PAL-N, PAL-Nc), the caption data is superimposed onto 23 lines (335 lines).
The closed caption/V-Chip waveform is shown below. After the color burst comes a sine wave known as Clock Run-In and
then the start bit. The start bit is always “001.” Two bytes of data (Char1, Char2) are sent for each line. Char1 and Char2 are
decoded from LSB, and an odd parity is usually added to MSB (bit 8).
Summary of Contents for VG-884
Page 1: ...Portable Video Signal Generator VG 884 Instruction Manual Ver 1 00 ...
Page 2: ......
Page 3: ...Portable Video Signal Generator VG 884 Instruction Manual 2012 7 Ver 1 00 ASTRODESIGN Inc ...
Page 4: ......
Page 16: ...xii ...
Page 26: ...10 ...
Page 58: ...42 ...
Page 93: ...Chapter 4 Selecting and Editing Pattern Data 77 ...
Page 96: ...80 ...
Page 99: ...Chapter 4 Selecting and Editing Pattern Data 83 12BIT 0 4095 ...
Page 108: ...92 0 1 2 3 4 5 6 ...
Page 147: ...Chapter 5 Output Settings 131 MENU Display returns to the initial screen ...
Page 161: ...Chapter 5 Output Settings 145 3 4Kx2K 24Hz SMPTE ...
Page 164: ...148 9 16 9 4 3 center ...
Page 166: ...150 3 AdobeYCC601 4 AdobeRGB ...
Page 170: ...154 6 176 4kHz 7 192kHz ...
Page 177: ...Chapter 5 Output Settings 161 2 12bit ...
Page 183: ...Chapter 5 Output Settings 167 1 Advance Cipher Enhanced Link Verification is not supported ...
Page 206: ...190 9 16 9 4 3 center ...
Page 208: ...192 3 AdobeYCC601 4 AdobeRGB ...
Page 211: ...Chapter 5 Output Settings 195 7 192kHz ...
Page 228: ...212 ...
Page 246: ...230 Teletext waveforms ...
Page 270: ...254 ...
Page 290: ...274 Select EXECUTE using or INC DEC and then press SET to erase the user characters ...
Page 304: ...288 ...
Page 351: ...Carter10 Internal data 335 ...
Page 354: ...338 F0H letters me 1 F1H letters me 2 VESA specifications ...
Page 355: ...Carter10 Internal data 339 ...
Page 356: ...340 F2H Chinese character AI F3H Chinese character BI ...
Page 357: ...Carter10 Internal data 341 ...
Page 358: ...342 F4H Chinese character TAKA F5H Chinese character KIRI ...
Page 359: ...Carter10 Internal data 343 ...
Page 360: ...344 F6H Chinese character KEN F7H Burst ...
Page 361: ...Carter10 Internal data 345 ...
Page 362: ...346 10 4 Character pattern data 5 7 character pattern table 1 of 2 ...
Page 363: ...Carter10 Internal data 347 ...
Page 364: ...348 5 7 character pattern table 2 of 2 ...
Page 365: ...Carter10 Internal data 349 7 9 character pattern table 1 of 2 ...
Page 366: ...350 ...
Page 368: ...352 ...
Page 369: ...Carter10 Internal data 353 16 16 character pattern table 1 of 4 ...
Page 370: ...354 ...
Page 371: ...Carter10 Internal data 355 16 16 character pattern table 2 of 4 ...
Page 372: ...356 ...
Page 373: ...Carter10 Internal data 357 16 16 character pattern table 3 of 4 ...
Page 374: ...358 ...
Page 375: ...Carter10 Internal data 359 16 16 character pattern table 4 of 4 ...
Page 376: ...360 ...
Page 379: ...Chapter10 Internal data 363 Table of TV standard signal timing waveforms 1 of 3 ...
Page 380: ...364 Table of TV standard signal timing waveforms 2 of 3 ...
Page 381: ...Chapter10 Internal data 365 Table of TV standard signal timing waveforms 3 of 3 ...
Page 382: ...366 ...
Page 384: ...368 ...