Astrodesign VG-876 - Page 19

Chapter 3 Analog Output Settings (ANALOG OUTPUT)
19
● CGMS-A / ID-1
■What is CGMA-A (Copy Generation Management System)?
CGMS-A is a system that multiplexes and sends copy control information in the vertical blanking interval.
■What is ID-1?
ID-1 is a system that multiplexes and sends aspect information in the vertical blanking interval.
■ CGMS-A/ID-1 specifications
CGMS-A/ID-1 is compatible with the following TV signals.
Additionally, CGMS-A/ID-1 is superimposed on composite signals, and Y/C signals.
・ NTSC,NTSC-M,NTSC-443
・ PAL-60,PAL-M
CGMS-A and ID-1 are superimposed on line 20 (1st field) and line 283 (2nd field). CGMS-A/ID-1 waveforms consist of
reference bits and 20-bit data. CGMS-A/ID-1 waveforms and bit assignment are shown below.
・ Bit1-0 : Aspect (ID-1)
Bit
Applications
1
2
Aspect ratio
Picture display format
0
0
4:3
Normal
1
0
16:9
Normal
0
1
4:3
Letter Box
1
1
Not Defined
・ Bit6-2: Locked to “0000”
70IRE±10IRE
0IRE
11.2us±0.3us
2.235us±50ns
Reference 1 2 3 4 … 20
Bit no
49.1us±0.44us
Line 20/283
CGMS-A / ID-1