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1. 发明授权

US3945033A Color eliminating circuit 失效
标题翻译：消色电路
公开(公告)号：US3945033A
公开(公告)日：1976-03-16
申请号：US432179
申请日：1974-01-10
申请人： Yozo Tanihara , Masayasu Niimi
发明人： Yozo Tanihara , Masayasu Niimi
IPC分类号： H04N9/71 , H04N9/70 , H04N9/49
CPC分类号： H04N9/70 , H04N9/71
摘要： A color eliminating circuit comprises a killer detection circuit, a band amplifier circuit and a control circuit. The killer detection circuit detects a color burst signal in a chromatic signal applied to an input thereof, and delivers a killer output voltage to the band amplifier circuit. When the killer output voltage is higher than a predetermined operating voltage of the band amplifier circuit, the band amplifier circuit amplifies the chromatic signal supplied thereto; when the killer voltage is lower than the operating voltage, the band amplifier circuit does not amplify the chromatic signal. The control circuit provides a gate pulse for the detection of the color burst signal, which pulse is applied to a further input of the killer detection circuit. When the killer voltage is below the operating voltage of the band amplifier circuit, the control circuit interrupts the provision of the gate pulse, to prevent the killer voltage from being supplied from the killer detection circuit. Thus, where the field strength of received signals is extremely low, an increase in the killer voltage due to noise, which might inadvertently operate the band amplifier circuit, is avoided.
摘要翻译：彩色消除电路包括一个杀手检测电路，一个带放大器电路和一个控制电路。杀手检测电路检测施加到其输入端的彩色信号中的色同步信号，并将抑制输出电压传送给带放大器电路。当抑制输出电压高于带宽放大器电路的预定工作电压时，带放大器电路放大提供给它的彩色信号; 当抑制电压低于工作电压时，带放大器电路不会放大彩色信号。控制电路提供用于检测彩色同步信号的栅极脉冲，该脉冲被施加到抑制检测电路的另一个输入端。当抑制电压低于带宽放大器电路的工作电压时，控制电路中断提供栅极脉冲，以防止抑制电压从抑制检测电路提供。因此，在接收信号的场强非常小的情况下，避免了可能无意中操作带放大器电路的噪声引起的杀伤电压的增加。

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