1) "Secam" -- As to secam

SECAM, also written SÉCAM (Séquentiel couleur à mémoire, French for "sequential color with memory"), is an analog color television system first used in France. A team led by Henri de France working at Compagnie Française de Télévision (later bought by Thomson) invented SECAM. It is, historically, the first European color television standard.
Television encoding systems by nation

1 Technical details

2 History

3 Why SECAM in France?

4 Why SECAM elsewhere?

5 SECAM varieties

6 Problems with the standard

7 Facetious interpretations of the SECAM acronym

8 Countries and territories that use SECAM

9 See also

10 External links

Just as the other color standards adopted for broadcast usage over the world, SECAM is a compatible standard, which means that monochrome television receivers predating its introduction are still able to show the programs, although only in black and white. Because of this compatibility requirement, color standards add a second signal to the basic monochrome signal, and this signal carries the color information, called chrominance or C in short, while the black and white information is called the luminance (Y in short). Old TV receivers only see the luminance, while color receivers process both signals.

Additionally, for compatibility, it is required to use no more bandwidth than the monochrome signal alone; the color signal has to be somehow inserted into the monochrome signal, without disturbing it. This insertion is possible because the spectrum of the monochrome TV signal is not continuous, hence empty space exists which can be utilized. This lack of continuity results from the discrete nature of the signal, which is divided into frames and lines. Analogue color systems differ by the way in which empty space is..."

Further Data On Term for secam
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