公开(公告)号：US4092667A

公开(公告)日：1978-05-30

申请号：US787155

申请日：1977-04-13

申请人： Susumu Akazawa ,  Takao Tsuchiya ,  Kyoichi Murakami ,  Takashi Okada

发明人： Susumu Akazawa ,  Takao Tsuchiya ,  Kyoichi Murakami ,  Takashi Okada

IPC分类号： H04N9/71 ,  H04N9/49

CPC分类号： H04N9/71

摘要： An automatic chrominance control and color killer circuit for use in a color television receiver having a gain controllable chrominance amplifier for selectively amplifying chrominance signals and a color burst signal transmitted with a composite television signal during a color television transmission. The circuit further has a burst level detector connected to the chrominance amplifier, a control circuit including a time constant circuit connected to the burst level detector for deriving a control signal, which is supplied to the chrominance amplifier for controlling the gain thereof in response to the level of the control signal during the presence of the burst signal and for activating and inactivating the chrominance amplifier when the level of the control signal goes over and below a predetermined level, and a circuit connected between the burst level detector and the time constant circuit for shortening the time constant of the latter when the level of an output signal of the former goes below a predetermined level.

公开(公告)号：US3985954A

公开(公告)日：1976-10-12

申请号：US568783

申请日：1975-04-17

申请人： Yasunobu Kuniyoshi ,  Takao Tsuchiya

发明人： Yasunobu Kuniyoshi ,  Takao Tsuchiya

IPC分类号： H04N5/08 ,  H04N5/16 ,  H04N5/18 ,  H03K5/08

CPC分类号： H04N5/165 ,  H04N5/08

摘要： A DC level control circuit wherein the DC level of an input signal is compared to a reference level and a DC bias potential is varied in accordance with said comparison, the varied bias potential being fed back to correspondingly vary the DC level input signal.

摘要翻译： 根据所述比较，将输入信号的直流电平与基准电平和直流偏置电位进行比较的DC电平控制电路，反馈的偏置电位相应地改变直流电平输入信号。