PURPOSE: To transmit a TV signal of high image resolution by extracting an image pickup signal of a wide band out of a balanced modulating circuit and giving the color signal processing to the image pickup signal so as to secure the compatibility with the NTSC standard system.
CONSTITUTION: A balanced modulating circuit 24 produces a luminance signal of a wide band and color difference signals, e.g., R-Y and B-Y from image pickup signals of three primary colors R, G and B. The circuit 24 limits the signal Y and two color difference signals to an m-fold band compared with the NTSC standard system. Then the rectangular double phase amplitude modulation is given to those color difference signals with an (m+1)-fold subcarrier frequency compared with the chrominance subcarrier frequency of standard system. This output signal is sent to a mixer 28 via a BPF25 and mixed with a subcarrier frequency (m+2) times as much as the frequency of chrominance subcarrier to be converted into a chrominance signal of a difference chorminance subcarrier frequency. This chrominance signal is multiplexed with the signal Y, and at the same time a burst signal, a syncrhonizing signal and a pilot signal of (m) times as much as a wobbling signal are added 23 together. Thus a TV signal of high image resolution is delivered.
TAKEDA MINORU
FUJISAWA SEIJI
MORITA KATSUMI
TAIRA HIDEKAZU
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