FRENCH COLOR TV CHROMINANCE

Description: The SECAM system employs time multiplexing of two chrominance signals, which are transmitted sequentially. It utilizes a one-line memory in the receiver circuit.

The SECAM (Séquentiel Couleur avec Mémoire) system is a color television broadcasting standard that was primarily used in France and several other countries. This system is distinct from other color television standards such as NTSC and PAL, primarily due to its method of encoding color information. In SECAM, two chrominance signals are multiplexed in time, meaning that these signals are transmitted one after the other rather than simultaneously. This sequential transmission allows for efficient use of bandwidth and reduces the potential for color distortion that can occur with other methods.

The receiver circuit in SECAM is equipped with a one-line memory, which plays a crucial role in the decoding process. This memory temporarily stores the incoming signal for one line of video, allowing the receiver to synchronize the chrominance information correctly. The use of one-line memory helps to ensure that the color information is accurately displayed, as it compensates for the time delay between the transmission of the two chrominance signals.

In practical applications, the SECAM system requires specific components in the receiver circuit to handle the time multiplexing and memory functions. These components may include analog-to-digital converters, memory chips, and digital signal processors, which work together to decode the transmitted signals and reconstruct the color image for display. Overall, the design of SECAM receivers is critical for maintaining the quality and integrity of the color television signal in environments where this standard is used.SECAM system uses time multiplexing of two chrominance signals, transmitted sequentially, with one-line memory in receiver circuit. -R. Chaste, P. Cassagne, and M. Colas, Sequential Receivers for French Color Tv System, Electronics, 33:19, p 57-60.