DECODING SYSTEM FOR A PAL COLOR TELEVISION RECEIVER

摘要

A delay line type separator supplying first burst and chrominance signals to one input of a signal adding circuit and second burst and chrominance signals, through phase adjusting and gating circuits to a second input of the signal adding circuit. The phase adjusting and gating circuits include a phase splitter supplying an inverted and noninverted second chrominance signal through two diode gates and a 90 DEG phase shifted second burst signal through a third diode gate. The output of the signal adding circuit, during burst transmission, is processed to produce a square pulse with a repetition rate equal to the sum of the first burst signal and the 90 DEG phase shifted second burst signal, or one half the repetition rate of the transmitted burst signals. The square pulse is utilized as a gating pulse to cause the diodes to supply alternately inverted second chrominance signals to the adding circuit.