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Circuit arrangement for the reduction of color errors in a color television receiver
Circuit arrangement for the reduction of color errors in a color television receiver
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机译:用于减少彩色电视接收机中的颜色误差的电路装置
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摘要
1395643 Colour television NIPPON VICTOR KK 4 May 1972 [6 May 1971 27 Aug 1971 (2)] 20798/72 Heading H4F Phase errors in a PAL colour television signal due to transmission errors are removed in the receiver by the use of notch filters 20, 21, Fig. 4, after the demodulators 16, 17. Filters 20, 21, each of which is formed of two impedance circuits Z1, Z2, Fig. 11, at least one which is a two-terminal reactance circuit, pass signals at frequencies which are integral multiples of the line frequency and remove signals at frequencies which are at odd integral multiples of half the line frequency, and thus the phase error components which have a repetition frequency of half the line-frequency. These frequencies may be removed only below a chosen frequency, all frequencies above this frequency being passed by filters 20, 21. Alternatively if an odd number (N) of vertical colour bars are to be displayed the frequencies removed may be those which are at an odd integral multiple of the number of colour bars times half the line frequency (N#H/2).
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机译:1395643彩色电视NIPPON VICTOR KK 1972年5月4日[1971年5月6日,1971年8月27日(2)] 20798/72标题H4F使用陷波滤波器20在接收机中消除了由于传输错误引起的PAL彩色电视信号中的相位误差,在解调器16、17之后的图21,图4中,每个由两个阻抗电路Z1,Z2(图11)形成的滤波器20、21,至少一个是两端电抗电路,使信号通过频率是线路频率的整数倍,并去除频率是线路频率的一半的奇数整数倍的信号,从而消除了具有线路频率一半的重复频率的相位误差分量。可以仅在选定频率以下去除这些频率,高于该频率的所有频率都由滤波器20、21通过。或者,如果要显示奇数(N)的垂直彩条,则去除的频率可以是处于彩条数的奇数整数倍乘以行频的一半(N#H / 2)。
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