Color Standards
There are three main analog broadcast television systems in use around the world, PAL (Phase Alternating Line), NTSC (National Television System Committee) and SECAM (Séquentiel Couleur à Mémoire—Sequential Color with Memory).
The system used in North America is NTSC. Western Europe, Australia, Africa and Eastern South America use PAL. Eastern Europe used SECAM, but switched to PAL after the change of the political regimes there. France still uses SECAM. Generally, a device (such as a television) can only read or display video encoded to a standard which the device is designed to support; otherwise, the source must be converted (such as when European programs are broadcast in North America or vice versa). Because a tint control is unnecessary in PAL, NTSC has jokingly been said to stand for Never The Same Color or Never Twice the Same Color.
This table illustrates the differences:
| NTSC M | PAL B,G,H | PAL I | PAL N | PAL M | SECAM B,G,H | SECAM D,K,K',L | |
|---|---|---|---|---|---|---|---|
| Lines/Fields | 525/60 | 625/50 | 625/50 | 625/50 | 525/60 | 625/50 | 625/50 |
| Horizontal Frequency | 15.734 kHz | 15.625 kHz | 15.625 kHz | 15.625 kHz | 15.750 kHz | 15.625 kHz | 15.625 kHz |
| Vertical Frequency | 60 Hz | 50 Hz | 50 Hz | 50 Hz | 60 Hz | 50 Hz | 50 Hz |
| Color Subcarrier Frequency | 3.579545 MHz | 4.43361875 MHz | 4.43361875 MHz | 3.582056 MHz | 3.575611 MHz | ||
| Video Bandwidth | 4.2 MHz | 5.0 MHz | 5.5 MHz | 4.2 MHz | 4.2 MHz | 5.0 MHz | 6.0 MHz |
| Sound Carrier | 4.5 MHz | 5.5 MHz | 5.9996 MHz | 4.5 MHz | 4.5 MHz | 5.5 MHz | 6.5 MHz |
Digital television broadcasting standards, such as ATSC, DVB-T, DVB-T2, and ISDB, have superseded these analog transmission standards in many countries.
Read more about this topic: Color Television
Famous quotes containing the words color and/or standards:
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The fragrance of the woman not her self,
Her self in her manner not the solid block,
The day in its color not perpending time,
Time in its weather, our most sovereign lord,
The weather in words and words in sounds of sound.”
—Wallace Stevens (1879–1955)
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—New Yorker (April 23, 1990)