Introduction - If you have any usage issues, please Google them yourself
Binary Frequency Shift Keying (BFSK), the frequency of a constant amplitude carrier signal is switched between two values according to the two possible message states (called high and low tones) corresponding to a binary 1 or 0.Depending on how the frequency variations are imparted into the transmitted waveform, the FSK signal will have either a discontinuous phase or continuous phase between bits.