第二项优化是噪声分析，它将周围环境中重复的噪音打包为越小越好的音频子帧（sub-frames），使其占用更小的带宽。利用分析阶段获得的信息，SILK编码器就可以进行音高预测和频率量化。
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Deeply studied the outbound signal format and timing mode of BeiDou Navigation Satellite System, include superframe format, subframe format and broadcast message format of the outbound signal, and also the basic principle, comparison and error analysis of two timing modes.
对北斗卫星导航系统出站信号格式和授时方式进行了深入研究,包括：出站信号的超帧格式、子帧格式和出站广播信息格式以及两种授时方式的基本原理、特点比较和误差分析等。
参考来源 - 基于北斗卫星导航系统和实时以太网EPA的配电线路全线速断保护研究·2,447,543篇论文数据，部分数据来源于NoteExpress
将所述子帧序列分组为子帧组。
The sequence of sub frames is grouped into groups of sub frames.
把待发送的码元序列转换为子帧序列。
A sequence of symbols to be transmitted is converted to a sequence of sub frames.
所述方法还包括传送至少一个与第二帧相关的子帧的步骤。
The method also includes the step of transmitting at least one sub-frame associated with a second frame.
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