However, because the method of DF only USES document frequency to scale the distinguish capacity, we find it has two disadvantages.
但是通过分析我们发现，由于仅仅使用文档频率来衡量特征的区分能力，文档频率方法存在两个问题。
Small scale fluctuation can be described in two scenarios: time dispersive and frequency dispersive.
小尺度衰落可以从信道的时间色散性和频率色散性两方面进行研究。
T12 is a full-range multi-purpose two-frequency, can be used for fixed installation, Hall PA, flowing performance, and supporting large-scale sound reinforcement system fills and so on.
T12是一款全频多用途两分频，可以用于固定安装、厅堂扩声、流动演出以及大型扩声系统的辅助补声等等。
T12 is a full-range multi-purpose two-frequency, can be used for fixed installation, Hall PA, flowing performance, and supporting large-scale sound reinforcement system fills and so on.
T12是一款全频多用途两分频，可以用于固定安装、厅堂扩声、流动演出以及大型扩声系统的辅助补声等等。
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