JPS6449396A - Stereoscopic video signal synthesizing circuit - Google Patents

Abstract

PURPOSE:To make a color sub-carrier phase between lines successive and to attain stable color-demodulation with a common color demodulating circuit by subtracting information per line by an (n+1/4) periods of a color sub-carrier period when video signals for right eye and left eye are time-base-compress and read. CONSTITUTION:For one line termination of NTSC color video signals for right eye and left eye, only the (n+1/4)/fsc A{9146/28}on condition that the (n) is an integer number and the fsc is a color sub-carrier frequency] is lacked and for the other line starting edge of the NTSC color video signal, only an (m+1/4)/fsc [on condition that the (m) is the integer number] is lacked. Then, successive synthesization is executed without intervals. With attentioning the matter one line period of the NTSC color signal is 227.5-fold of the color sub- carrier period and the matter a color sub-carrier phase synthesizes the line of the same number, namely, phase-inverting is occurred in each two lines in case the lines for right eye and left eye are synthesized, a time-base compression ratio is set to be 909/(910X2) so as to subtract respectively the 1/4 period of the color sub-carrier period for the line termination of a preceding image and the line starting edge of a succeeding image.