The Digital Phase Lock Loop(DPLL)is the core of the coherent demodulation.

数字锁相环路（DPLL）是数字相干解调技术的核心。

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The phase- locked loop is one kind of control system which is able to achieve phase automatic lock, to compose frequency and to trace demodulation system.

锁相环路是一种能实现相位自动锁定的控制系统，主要用于频率合成及跟踪解调系统。

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We have mainly researched two FM signal demodulation techniques called Frequency Spectrum Separation and Phase Lock Loop in the first part.

一次解调中研究了频谱分离法和锁相法两种实现鉴频的技术。

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