THE SECAM SYSTEM
In 1954, Henri De France, a French engineer, published the description of a new colour television system called the “Henri De France System”. However, due to a number of limitations this system did not find practical application. In 1956-1957, it gave way to a new design from which a whole family of systems has grown under the common name of SECAM (Sequential couleur a memoire). It is used in the erstwhile USSR and France.
The SECAM system has a different mode of transmission. The colour difference signals are not arranged a quarter of a cycle apart, but are kept separate by transmitting them on alternate lines of the picture. Delay lines, inside the receiver then hold up one set of signals so that they can be recombined to build ...
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