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    • 1. 发明授权
    • Video signal recording system
    • 视频信号记录系统
    • US5311323A
    • 1994-05-10
    • US924456
    • 1992-08-04
    • Hideo Honda
    • Hideo Honda
    • H04K1/00G11B20/00H04N5/782H04N5/91H04N5/913H04N5/76
    • G11B20/00086H04N5/913H04N5/782
    • A video recording system is provided with a copy guard arrangement which can readily discriminate a video signal having pseudo horizontal synchronizing pulses in a portion of a vertical blanking interval, from a normal video signal, without deteriorating the quality of recorded pictures. Preferably, an analog circuitry or a microcomputer is designed to count the horizontal synchronizing pulses received during a predetermined portion of the vertical blanking interval, and to discriminate a copy-guarded video signal from an unguarded video signal in accordance with the result of the counting. In the case of the copy-guarded video signal, an inhibit signal is produced to prevent a normal recording operation.
    • 视频记录系统具有复制保护装置,其可以在垂直消隐间隔的一部分中从正常视频信号中容易地识别具有伪水平同步脉冲的视频信号,而不会降低记录图像的质量。 优选地,模拟电路或微型计算机被设计为对在垂直消隐间隔的预定部分期间接收的水平同步脉冲进行计数,并且根据计数结果来区分拷贝保护的视频信号与未被保护的视频信号。 在复制保护视频信号的情况下,产生禁止信号以防止正常记录操作。
    • 2. 发明授权
    • Bias circuit
    • 偏置电路
    • US4230980A
    • 1980-10-28
    • US40406
    • 1979-05-18
    • Yoshiaki SanoToshio HanazawaHideo Honda
    • Yoshiaki SanoToshio HanazawaHideo Honda
    • H03F1/30G05F3/30H03F3/187G05F3/20
    • H03F3/187G05F3/30
    • A bias circuit for generating bias voltages or bias currents including first and second elements for generating a voltage corresponding to the sum of two voltage drops in a forward p-n junction; first and second transistors for generating a negative feedback current; at least one resistor for determining the value of a constant current for generating bias voltages; a negative feedback circuit; a third resistor connected in the feedback circuit, and; a starting element for supplying currents to the first and second elements and to the first and second transistors in an initial state when the power is turned on, whereby the feedback circuit operates to generate the constant current which is used for forming bias voltages.
    • 一种用于产生偏置电压或偏置电流的偏置电路,包括用于产生对应于正向p-n结中的两个电压降之和的电压的第一和第二元件; 用于产生负反馈电流的第一和第二晶体管; 用于确定用于产生偏置电压的恒定电流的值的至少一个电阻器; 负反馈电路; 连接在反馈电路中的第三电阻器, 用于在电源接通时以初始状态向第一和第二元件以及第一和第二晶体管提供电流的起始元件,由此反馈电路工作以产生用于形成偏置电压的恒定电流。