SECAM vs. PAL and NTSC: How the Analog TV Standards Compare

Understanding SECAM: History, Technical Specs, and Legacy

Overview

SECAM (Séquentiel Couleur à Mémoire — “sequential colour with memory”) is an analog color-television encoding system developed in France in the 1950s–1960s as an alternative to NTSC and a contemporary of PAL. It was designed to improve color stability over imperfect transmission channels by sending chrominance information sequentially and using memory (delay) in the receiver to reconstruct full-color lines.

History and adoption

• Origins: Conceived by Henri de France and developed by Compagnie Générale de Télévision/Thomson, SECAM’s concepts date from the mid‑1950s; the standard was rolled out commercially in the 1960s.
• First broadcasts: France introduced SECAM for 625-line, 25 Hz (50 fields/s) color broadcasting in the late 1960s.
• Geographic use: Adopted across parts of Eastern Europe, the former USSR, much of Africa, parts of the Middle East, France and its former colonies, and some Eastern Bloc countries. Over time many adopters migrated to digital broadcasting (DVB, satellite, cable), reducing the relevance of SECAM as a transmission format.
• Political/