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电视图象视频讯号的频潜是包括直流及极低频率到6MHz的各种频率的随机分布的统计结果。如实地放大视频讯号,至多能平淡无奇地复现图象。本文用富里哀级数论证了:若从技术上采取措施,在1至5MHz范围内适当提升增益,可形成勾边的效果。使图象轮廓分明,细节清晰。并指出了实现这一结论的具体措施: 1.采取自由式的中放曲线:打破理论对中频位置的严格限制,将中频出增益50%处改为40%处,曲线形状也可比较自由。2.采取1至5MHz间慢爬坡式的视放曲线。本文所论述的结论,是作者多年实际工作所证实了的事实。
TVS video signal frequency dive is a random distribution of statistics including DC and very low frequency to 6MHz various frequencies. Faithfully enlarge the video signal, at best can blandly reproduce the image. This article demonstrates the rich mile series: If technically take measures to properly increase the gain within the range of 1 to 5MHz, the effect can be formed Cloak. Make the image clear outline, detail. And pointed out the specific measures to achieve this conclusion: 1. To take a free-style curve: to break the theoretical restrictions on the position of the IF, the IF gain 50% at 40%, the shape of the curve can be relatively free . 2. Adopt 1 to 5MHz slow climbing slope of the play curve. The conclusion discussed in this article is the fact confirmed by the author’s many years of practical work.