摘要: A broadcast system is provided in which the effects of differential distortions on composite television signals are reduced. At predetermined intervals, the broadcast signal includes a test signal having high frequency components at at least three average video signal levels. In a suitably ...
《杏园雅集图》是绘制于明正统年间的一幅具有肖像性质的雅集图.据明正统年间阁臣杨荣的《文敏集》,杨士奇的《东里续集》以及嘉靖年间阁臣李东阳的《怀麓堂集》记载,这幅画由宫廷画家谢环绘制,画卷绘于明正统二年(公元1437年)的农历三月初一,时值阁臣们的沐休假期;图中人物为杨士奇,杨荣,王直,杨溥,王英,钱习...
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