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Chapter 5
FUNCTIONS AVAILABLE WITH TV STANDARD SIGNALS
289
5.4 WSS
5.4.1
Description and specifications
What is WSS (Wide Screen Signaling)?
“WSS (Wide Screen Signaling)” is a system for multiplexing the aspect ratio information of the
images in the vertical sync blanking interval, and sending it.
WSS specifications
WSS supports the following TV signals.
WSS is superimposed onto the composite signals and Y/C signals.
• PAL, PAL-N, PAL-Nc
• SECAM
The aspect ratio information of WSS is superimposed on line 23 of the first field. The WSS waveform
consists of Run-In, Start Code and the 14-bit data. This waveform and the bit allocation are shown
below.
0.5V±5%
0IRE
11.0us±0.25us
Line 23
Run-In
Start Code
14 Data Bits
0
1
13
Bit
27.4us
Video
WSS(Widscreen Signaling)
• Bit3-0:
Aspect
Bit
0 1 2
3
Aspect Ratio
Full format or Letterbox
Position
0 0 0
1 4:3
Full format
Not applicable
1 0 0
0 14:9
Letterbox
Center
0 1 0
0 14:9
Letterbox
Top
1 1 0
1 16:9
Letterbox
Center
0 0 1
0 16:9
Letterbox
Top
1 0 1
1 >16:9
Letterbox
Center
0 1 1
1 14:9
Full format
Center
1 1 1
0 16:9
Full format
Not applicable
Bit 3 is the parity bit.
• Bit4-13: Other service information (not supported by the VG-870B/871B/873/874)
Summary of Contents for VG-870B
Page 1: ...Programmable Video Signal Generator VG 870B 871B 873 874 Instruction Manual Ver 3 80 ...
Page 2: ......
Page 4: ......
Page 14: ...x ...
Page 58: ...40 ...
Page 220: ...202 4 12 8 DDC CI For further details on the setting procedure refer to 6 13 4 DDC CI ...
Page 286: ...268 ...
Page 362: ...344 0 1 2 3 4 5 6 ...
Page 394: ...376 ...
Page 426: ...408 ...
Page 450: ...432 ...
Page 537: ...Chapter 11 SPECIFICATIONS 519 F0H letters me 1 F1H letters me 2 VESA specifications ...
Page 538: ...520 F2H Chinese character AI F3H Chinese character BI ...
Page 539: ...Chapter 11 SPECIFICATIONS 521 F4H Chinese character TAKA F5H Chinese character KIRI ...
Page 540: ...522 F6H Chinese character KEN F7H Burst ...
Page 542: ...524 5 7 character pattern table 2 of 2 ...
Page 543: ...Chapter 11 SPECIFICATIONS 525 7 9 character pattern table 1 of 2 ...
Page 544: ...526 7 9 character pattern table 2 of 2 8 9 dots are used for 80H to 8FH ...
Page 545: ...Chapter 11 SPECIFICATIONS 527 16 16 character pattern table 1 of 4 ...
Page 546: ...528 16 16 character pattern table 2 of 4 ...
Page 547: ...Chapter 11 SPECIFICATIONS 529 16 16 character pattern table 3 of 4 ...
Page 548: ...530 16 16 character pattern table 4 of 4 ...
Page 554: ...536 ...