Schaltkreis zum Unterscheiden der Zeile eines Videosignals

摘要

Demodulated 44 colour difference signals R-Y, B-Y are fed to a sign detector 46 where the signals are fist accumulated 12, 14; 20, 22 over a line period and the sign bit of current and previous line sums made available to discriminator 48. From the sign bits the discriminator determines whether the current line is an odd or an even line and outputs a discrimination signal PLINE. <IMAGE>