that teletext often carries important information, such as subtitles in various languages and for the hearing impaired viewers, as well as, in the future, coded sound commentary for the visual impaired viewers and similar ancillary programme-related servi
ITU-R BR.1218-1-2001由国际电信联盟 IX-ITU 发布于 2001-01-01。
ITU-R BR.1218-1-2001 在中国标准分类中归属于: M32 数据通信设备。
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