发明授权
US4151551A Programmable color enable and sequencing system for secam 失效
可编程色彩使能和排序系统

Programmable color enable and sequencing system for secam
摘要:
A programmable color enable and sequencing system for a sequential color and memory television system is provided. An output for sequencing the sequential colors of the SECAM system in a decoder and enabling color if chrominance is present is generated by statistically detecting the presence of color information and, using the same statistical detector, provides for synchronization of the color sequence circuits. The statistical detection uses FM information provided during the vertical interval and/or information contained in the color subcarrier of the composite SECAM signal. Additionally, the system includes means for providing a preprogrammed color enable for each one-half line defined according to user needs or system standards for enabling instantaneous decisions about which lines of the composite signal are color. Decisions as to whether or not the overall picture is color are made by the statistical detector.
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