Firstly, the spectrum properties of FSK signal are introduced and the principle of spectrum estimation for FSK signal detection is discussed in detail.

首先介绍了FSK信号的频谱特性，详细分析了FSK信号谱估计检测理论。

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The core of Caller ID detection is demodulation of the FSK signal. The common used FSK demodulation algorithm demodulates the FSK signal by spectrum analysis.

来电显示的核心部分就是对来电显示信号即FSK信号的解调。

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