High resolution television

Abstract

A method and apparatus are disclosed for increasing vertical resolution of television and eliminating vertical aliasing by modulating vertical deflection of the camera a significant number of cycles per line, and modulating the vertical deflection of the display unit in phase with the modulation of the camera while displaying the video signal transmitted. The display unit is provided with its own modulating oscillator operating at the same stable frequency as the modulating frequency of the camera, and phase synchronized by information transmitted by the camera. In the case of NTSC color television, the vertical deflection modulating oscillator of the camera is the color modulating oscillator, and the vertical deflection modulating oscillator of the receiver is the oscillator used for color demodulation phase synchronized by color bursts gated during blanking periods of each frame. A frequency doubler is employed for modulation of vertical deflection in both the camera and the receiver in order that, for a line scanning rate of 15,734 lines per second, there will be 455 modulation cycles for each line. This technique for increasing vertical resolution can be practiced with other equipment and other standards, such as and SECAM, and other video displays including but not limited to computer terminals, teleconferencing, and phonevision.