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在彩色电视机的电路中,为了补偿付载波吸收电路对亮度信号的影响,通常都没有勾边电路(又称轮廓校正电路)。而目前在进口与国产彩色电视机中普遍采用的是一种二次微分型的勾边电路。本文给出了一种新的、供彩色机使用的实用勾边电路一延时线型勾边电路及其实验结果,并对其关键元件——延时线的参数选择得出了实用的计算公式。该电路不仅具有简单、可调、无相位失真、输出波形好等优点,而且它能根据图象的质量来选取延迟时间,机动性大,适用面广,不仅用于彩色接收机中,而且也可用于摄象机电路中。
In the color TV circuit, in order to compensate for the subcarrier absorption circuit on the brightness of the signal, there is usually no hook circuit (also known as contour correction circuit). At present, commonly used in imports and domestic color TV is a secondary differential type of the hook circuit. This paper presents a new type of practical circuit for the use of a color machine, a delay line-type circuit and its experimental results, and its key components - the choice of delay line parameters come to practical calculations formula. The circuit not only has the advantages of simple, adjustable, no phase distortion, good output waveform, etc., but also can select the delay time according to the quality of the image, has large mobility and wide application range, not only in the color receiver, but also in the color receiver Can be used in the camera circuit.