公开(公告)号：US3806636A

公开(公告)日：1974-04-23

申请号：US30661672

申请日：1972-11-15

Applicant: GEN ELECTRIC

Inventor： TRUE T ,  BATES W

IPC: H01J31/24 ,  H04N9/31 ,  H04N9/12

CPC classification number: H01J31/24

Abstract: Cross-coupling of red, blue or magenta light into the green portion of an image produced by a light valve projector is greatly reduced by limiting the maximum slope of the walls forming the ends of portions of the green diffraction grating to a value which avoids excessive refraction. This is accomplished by altering the passband of the modulated carrier producing the green diffraction grating such that, for high video frequencies, single sideband modulation occurs. Alternatively, the slew rate of the video signal modulating the carrier producing the green diffraction grating may be limited.

Abstract translation: 通过将形成绿色衍射光栅的部分的端部的壁的最大斜率限制在避免过度的值的情况下，红色，蓝色或品红色光与光阀投影仪产生的图像的绿色部分的交叉耦合被大大降低 折射。 这通过改变产生绿色衍射光栅的调制载流子的通带来实现，使得对于高视频频率，发生单边带调制。 或者，可以限制调制产生绿色衍射光栅的载体的视频信号的转换速率。

公开(公告)号：US3728476A

公开(公告)日：1973-04-17

申请号：US3728476D

申请日：1971-03-17

Applicant: GEN ELECTRIC

Inventor： BATES W ,  TRUE T

IPC: H03H11/12 ,  H04N9/78 ,  H03H7/04 ,  H04N5/14

CPC classification number: H03H11/1217 ,  H04N9/78

Abstract: Chrominance frequency components in the luminance channel of a color television camera are reduced by a luminance channel notch filter having substantially linear phase characteristics and adjustable notch depth. The luminance notch is developed by subtraction of a bandpass-filtered video signal from the overall video input signal. The filter, which exhibits symmetrical transient response, improved low light level noise performance and minimizes spurious color effects due to interaction of chrominance signal components with the luminance signal.

Abstract translation: 彩色电视摄像机的亮度通道中的色度频率分量通过具有基本线性相位特性和可调陷波深度的亮度通道陷波滤波器来减小。 通过从整个视频输入信号中减去带通滤波的视频信号来产生亮度陷波。 具有对称瞬态响应的滤波器改善了低光级噪声性能，并且由于色度信号分量与亮度信号的相互作用而使寄生颜色效应最小化。