Astrodesign VG-876 - Page 18

Chapter 3 Analog Output Settings (ANALOG OUTPUT)
18
● WSS
■ What is WSS (Wide Screen Signaling)?
WSS (Wide Screen Signaling) is a system that multiplexes and sends video aspect information in the vertical blanking
interval.
■ WSS specifications
WSS is compatible with the following TV signals.
WSS is superimposed on composite signals, and Y/C signals.
・ PAL,PAL-N,PAL-Nc
・ SECAM
WSS aspect information is superimposed in line 23 of the first field. WSS waveforms consist of Run-In, Start Code, and
14-bit data. WSS waveforms and bit assignment are shown below.
Bit0-3: Aspect
Bit
Aspect
Ratio
Full format or
Letterbox
Position
0 1 2
3
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
Bit3 is parity
Bit4-13: Other service information is not supported
0.5V±5%
0IRE
11.0us±0.25us
Line 23
Run-In Start Code 14 Data Bits
0 1 13Bit
27.4us Video
WSS(Widscreen Signaling)