Decoder for decoding the chrominance signal of a color television signal

Claim 1

In a circuit for decoding chrominance signals of a color television signal including first and second reflection type delay lines having first and second input-output terminals respectively, switching means responsive to a switching signal for alternately applying said chrominance signals to said delay lines at the line frequency of said television signal, first and second decoder output terminals, and first and second variable impedance networks coupled between said delay line input-output terminals and said decoder output terminals and responsive to said switching signals for alternately attenuating the signals applied to said first and second decoder output terminals, the total electrical length of each delay line corresponding to the period of said line frequency of said television signal whereby at any instant in time an attenuated portion of said chrominance signal is provided at one of said first and second decoder circuit output terminals from said decoder input terminal, and an unattenuated delayed portion of said chrominance signal is provided at the other of said first and second decoder circuit output terminals from one of said delay lines.