Hello,

BINARY FREQUENCY SHIFT KEYING (BFSK) :

• It is a simple and robust form of Modulation
• It is used in Digital Communication System

The spectrum of BFSK may be viewed as the sum of Two ASK Spectra

Please visit the link given below for further details :

https://drive.google.com/file/d/1hMM8yCtZ2Hv2iWUWfGy_P1hmk58lw6p9/view?usp=drivesdk

Hope it helps