Integrated circuit for part of SECAM colour decoder - four-pole change-over switch feeds two limiter stages

摘要

The integrated circuit, for part of a SECAM colour decoder, has a four-pole change-over switch controlled by a flip-flp and connected between two limiter stages, and the outputs of two amplifiers. The incoming FBAS signal passes via discrete HF de-emphasis circuit to the ident. stages that controls a bistable circuit at the inputs to both amplifiers. One amplifier has the delay line coupled to its input. The blanking signal generator is located on the output side of the four-pole change-over switch. The integrated circuit requires the minimum of terminals while containing the maximum possible functioning stages.