Playback circuit for a recorded three-line sequential color television signal

Claim 1

In a playback circuit for a three-line sequential color television signal, which circuit includes memory means composed of three delay lines connected together in series, each delay line producing a signal time delay equal to one horizontal picture line scanning period, means connecting one end of the resulting series arrangement of the memory means to receive the color television signal, means connected to the one end of the series arrangement and to the output of each delay line to present four outputs providing, the undelayed sequential signal and the sequential signal delayed by one, two and three horizontal picture lines, respectively, means connected to the four outputs to combine the signals thereat into a difference signal, and means connected for adding the difference signal to the three-line sequential signal, the improvement wherein: said memory means are constructed for causing the signals at said four outputs to have identical amplitudes; and means connected to combine the signals comprise four electrically identical combining components each connected to a respective one of said outputs and means connected for reversing the polarity of the undelayed signal and the signal delayed by three picture lines relative to the signals delayed by one and two picture lines.