Broadcast safe
Digital broadcasting is very different from analog. The NTSC and PAL standards describe both transmission of the signal and how the electrical signal is converted into an image. In digital, there is a separation between the subject of how data is to be transmitted from tower to TV, and the subject of what content that data might contain. While data transmission is likely to be a fixed and consistent affair, the content could vary from High Definition video one hour, to SD multicasting the next, and even to non-video datacasting. In the US, 8VSB transmits the data, while MPEG-2 encodes pictures and sound.
| Resolution | Aspect ratio | Pixel aspect ratio | Form of scanning | Framerate (Hz) | |
|---|---|---|---|---|---|
| Vertical | Horizontal | ||||
| 720 | 1280 | 16:9 | square | progressive | 23.976 24 25 29.97 30 50 59.94 60 |
| 1080 | 1920 | 16:9 | square | interlaced | 25 (50 fields/s) 29.97 (59.94 fields/s) 30 (60 fields/s) |
| progressive | 23.976 24 25 29.97 30 |
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Broadcast safe audio
Broadcast engineers in North America usually line up their audio gear to 0 db using a VU meter, in Europe equating to roughly +4 dB ~ +6 dB on a PPM [9] .
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See also
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External links
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References
- ^ After Effects CS3 - Broadcast-safe colors
- ^ Matrox - Composite video measurements
- ^ VideoUniversity.com - PAL Colour Bars
- ^ VideoUniversity.com - Engineering Primer
- ^ Tektronix - The Color Bars Signal -- Why and How
- ^ The 7.5 IRE Setup Problem
- ^ GeniusDV - Adobe Photoshop and NTSC Color Safe
- ^ VideoUniversity.com - Broadcast Requirements for Commercials and Informercials
- ^ Shure - VU and PPM Audio Meters: An Elementary Explanation
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