This article analyses the principle of detecting circuit in TV receiver. and explains theoretically the correct absorption of first sound IF so as to keep the sound from interfering the picture.
本文分析了电视机检波电路的原理，从理论上说明了伴音第一中频应吸收的强度，以使图象不受伴音干扰。
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It has been proved that the result of the binarization is well, and has good adaptability to the license plate picture with noise interfering and nonuniform illumination.