Television transmitter of high image resolution

Abstract

Abstract 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.

Inventors

• 👤 Toyokatsu Koga
• 👤 豊勝 古賀
• 👤 Minoru Takeda
• 👤 実 竹田
• 👤 Seiji Fujisawa
• 👤 藤沢　清次
• 👤 Katsumi Morita
• 👤 克己 森田
• 👤 Hidekazu Taira
• 👤 平　英一

Bibliographic Details