GY 中华人民共和国 广播电视和网络视听 行业标准 GY/T 423—2025 中、短波数字声音广播技术规范 Technical specification for digtial audio broadcasting in MF and HF band 2025 - 07 - 29发布 2025 - 07 - 29实施 国家广播电视总局 发布 GY/T 423—2025 I 目 次 前言 ................................ ................................ ............... III 引言 ................................ ................................ ................. V 1 范围 ................................ ................................ .............. 1 2 规范性引用文件 ................................ ................................ .... 1 3 术语和定义 ................................ ................................ ........ 1 4 缩略语、约定和符号 ................................ ................................ 2 4.1 缩略语 ................................ ................................ ........ 2 4.2 约定 ................................ ................................ .......... 4 4.3 符号 ................................ ................................ .......... 4 4.4 运算符号 ................................ ................................ ...... 4 5 系统描述 ................................ ................................ .......... 5 5.1 综述 ................................ ................................ .......... 5 5.2 传输模式 ................................ ................................ ...... 5 6 复用 ................................ ................................ .............. 7 6.1 概述 ................................ ................................ .......... 7 6.2 MSC ................................ ................................ ........... 8 6.3 FAC ................................ ................................ ........... 9 6.4 SDC ................................ ................................ .......... 12 6.5 文本信息应用 ................................ ................................ . 26 6.6 包模式 ................................ ................................ ....... 27 6.7 数据广播 ................................ ................................ ..... 32 7 信道编码与调制 ................................ ................................ ... 38 7.1 概述 ................................ ................................ ......... 38 7.2 传输复用适配和能量扩散 ................................ ....................... 39 7.3 编码 ................................ ................................ ......... 42 7.4 星座映射 ................................ ................................ ..... 53 7.5 编码在信道上的应用 ................................ ........................... 57 7.6 MSC符号交织 ................................ ................................ .. 59 7.7 MSC符号在传输超帧结构上的映射 ................................ ................ 60 8 传输结构 ................................ ................................ ......... 62 8.1 OFDM调制 ................................ ................................ ..... 62 8.2 子载波索引 ................................ ................................ ... 62 8.3 导频 ................................ ................................ ......... 63 8.4 控制子载波 ................................ ................................ ... 69 GY/T 423—2025 II 8.5 数据子载波 ................................ ................................ ... 71 8.6 同播传输 ................................ ................................ ..... 71 9 系统功能证实方法 ................................ ................................ . 71 9.1 概述 ................................ ................................ ......... 71 9.2 证实方法 ................................ ................................ ..... 71 附录A（资料性） 逻辑帧到复用帧的映射 ................................ ............... 72 附录B（资料性） MSC构造实例 ................................ ....................... 74 附录C（资料性） 业务标识指配 ................................ ....................... 78 C.1 概述 ................................ ................................ ......... 78 C.2