In 1987, the FCC issued a ruling indicating that the HDTV standards to be issued would be compatible with existing NTSC service, and would be confined to the existing VHF and UHF frequency bands.

• 1987年 扑灭发出裁决表示将发行标准清晰度电视；也符合现行NTSC系统服务 而限于现有的甚高频、超高频频带.