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经过8年的技术开发．美国联邦通信委员会（FCC）终于于199h年12月24日正式采纳广“大联盟”（GA）的高清晰度电视（HDTV）标准。大联盟的标准试验是在亚历山德里市的高级电视试验中心（ATTC）进行的．现场接收试验是在夏洛特电视台，结果表明，接收到的HDTV视音频信号质量与HDT
After eight years of technology development. The Federal Communications Commission finally adopted the Broad Alliance (GA) HDTV standard on December 24, 199 199. The Grand Alliance standard test was conducted at the Advanced Television Testing Center (ATTC) in Alexandria. The live reception test was conducted at Charlotte Television and the results showed that the quality of received HDTV video and audio signals was correlated with HDT