| 摘要 |
PURPOSE:To narrow down a band and to improve an S/N ratio by separating a color video signal into a luminance signal Y and color signals R and B and recording them on video tracks of a magnetic tape independently. CONSTITUTION:An image pickup lens 1, optical prism 2, and image pickup tubes 3a-3c of red, greeen, and blue detect video signals ER, EG, and EB corresponding to colors of a subject, and a matrix circuit 5 generates the luminance signal Y. Thus, narrow-band color signals R and G are outputted. Those signals Y, R, and B are recorded on the magnetic tape on helical scan basis by using three rotary heads. This system reduces noise voltages of red and blue in recording and reproduction as compared with an NTSC system (Y, R-Y, and B-Y) while the noise voltage of green is nearly equal. The video signal of green has a high level as a color signal, so a noise due to its signal component is conspicuous. Therefore, the total S/N ratio is improved as compared with the NTSC system which records the signal as it is. |
