Appendix C
Digital video
ITU-R BT.601
| 25Hz | 30 Hz | |
| Frame rate | 25 | 30 |
| Field rate | 50 | 60 |
| Line scanning rate | 15 625 | 15750 |
| Lines per frame | 625 | 525 |
| Luminance samples per line | 864 | 858 |
| Chrominance samples per line | 432 | 429 |
Luminance sampling frequency = line scan rate X luminance samples per line:
| For 625/50 standard TV signals: | 525/60 standard TV signals: |
| = 15625000 × 864 | = 15 750000 × 858 |
| = 13.5 MHz | =13.5 MHz |
Chrominance sampling frequency = line scan rate X chrominance samples:
| For 625/50 standard TV signals: | For 525/60 standard TV signals: |
| = 15 625 000 × 432 | = 15 750000 × 429 |
| = 6.75 MHz | = 6.75 MHz |
Therefore, for both standards, the total (composite) sampling frequency= 13.5 + 6.75 + 6.75 = 27 MHz ...
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