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彩色电视广播的节目制作中采用软色键的图象合成,大大提高了合成图象的逼真度,使色键的图象合成能在更复杂的摄象条件下应用。软色键图象合成技术的关键是一套良好的自动消色电路,本文着重讨论这种多交量双极性自动调整系统的特点,提出一种易于实现的自动消色方案。该方案中采用了一种新设计的360°压控相移电路作为被调元件,采用双差分模拟乘法器作为鉴相器及检幅器,采用一种新的双极性检波器实现双极控制。介绍了该系统的组成方框图及几种主要电路的工作原理和实验结果。
The use of soft-color key image synthesis in program production of color television broadcasts greatly enhances the fidelity of the synthesized image and enables the color key image synthesis to be applied under more complicated imaging conditions. The key of soft color key image synthesis technology is a set of good automatic achromatic circuits. This article focuses on the characteristics of this multi-cross bipolar automatic adjustment system and proposes an easy to implement automatic achromatic solution. The program uses a newly designed 360 ° voltage-controlled phase shift circuit as a tuned component, using a double differential analog multiplier as a phase detector and amplitude detector, using a new bipolar detector to achieve bipolar control. Introduced the system block diagram and several main circuit working principle and experimental results.