Ted Bildplatten Aktiengesellschaft

Gerald Dickopp

Werner Scholz

Gerhard Mahler

The disclosure is an improvement in a three-line sequential transmission system for a color television signal, particularly for recording, and where the sequential signal is transformed again, during reproduction with a series-connection of line delay lines, into three simultaneous color signals, and a luminance signal is obtained by composing the signals from several successive lines. In accordance with the disclosure, the luminance signal has an amplitude ratio between these signals, to increase the picture sharpness in the vertical direction, such that the amount of the luminance transmission function of the entire system, including recording and reproduction, at the frequencies (n+1/2)f.sub.H is substantially equal to those of the frequencies n.multidot.f.sub.H where n=0, 1, 2 . . . and f.sub.H is the line frequency. The composition is effected such that zeros appear in the low frequency range of the transmission function at the frequencies (n.+-.1/3)f.sub.H, and the zeros of the entire system are multiple even-numbered zeros, with the transmission functions of both the recording and the reproduction having a zero. A differential signal, derived from the undelayed signal and the signal delayed by three lines, is fed to the luminance signal in a reproduction circuit.

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Hanover, Germany

Gerald Dickopp