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公开(公告)号：US4017681A
公开(公告)日：1977-04-12
申请号：US608393
申请日：1975-08-27
摘要： A circuit measures the beam current of a cathode ray tube and derives a control signal from it to prevent overdriving and defocussing of the CRT. The circuit can measure both peak and average values and has an isolation circuit, such as an emitter follower, to prevent loading of the cathode circuit of the CRT.
摘要翻译： 电路测量阴极射线管的射束电流，并从中得到控制信号，以防止CRT的过驱动和散焦。 电路可以测量峰值和平均值，并具有隔离电路，例如射极跟随器，以防止CRT阴极电路的负载。
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2.发明授权Picture display apparatus including a line phase discriminator for generating a control voltage 失效包括用于产生控制电压的线相位差分辨率器的图像显示装置
公开(公告)号：US3937876A
公开(公告)日：1976-02-10
申请号：US197886
申请日：1971-11-11
CPC分类号： H04N5/126
摘要： A circuit arrangement in a picture display apparatus including an integrator having a time constant which is of the same order as one field period and which integrates the control voltage generated by the line phase discriminator. The voltage thus integrated is applied by means of a switch to the output terminal of the discriminator during each field blanking period. As a result both the flickering effect and the shift which may occur at the upper edge of the screen of the picture display tube as a result of the broad field synchronizing pulses and the equalizing pulses disappear. The circuit arrangement also includes a circuit which separates the discriminator from the integrator and which may be constituted as a long-tailed pair arrangement.
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