CONSOLIDATED CCIR SYSTEM-B STANDARDS
Based on Appendix A of IS : 4545-1968.
The main characteristics of the CCIR system-B for monchrome television, adopted in India are given below.
| Video Characteristics | |
|---|---|
| Number of lines per picture | 625 |
| Interlace ratio | 2 : 1 |
| Field frequency | 50 fields/sec |
| Picture frequency | 25 pictures/sec |
| Line frequency tolerance | 15625 lines/sec |
| ±0.1% | |
| Aspect ratio | 4 : 3 |
| Scanning sequence for lines | Left to right |
| Scanning sequence for fields | Top to bottom |
| Video bandwidth | 5 MHz |
| Approximate gamma of picture signal | 0.5 |
| Composite Video Signal Characteristics | |
|---|---|
| Line period H | 64 μs |
| Line blanking period HB | 18.5 to 19.2% of H, 11.8 to 12.3 μs |
| Front porch FP | 2 to 2.8% of H, 1.3. to 1.8 μs |
| Line sync ... | |
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