FSK（Frequency-shift keying）- 频移键控是利用载波的频率变化来传递数字信息。它是利用基带数字信号离散取值特点去键控载波频率以传递信息的一种数字调制技术。FSK（Frequency-shift keying）是信息传输中使用得较早的一种调制方式-FSK (Frequency-shift keying)- Frequency shift keying is the use of the carrier frequency to transmit digital information. It is the use of discrete values ​ ​ of the baseband digital signal to the keying features of the carrier frequency to transmit information in a digital modulation technique. FSK (Frequency-shift keying) is used in transmission of information obtained earlier a modulation