![]() Following is the diagrammatic representation. The block diagram of Asynchronous FSK detector consists of two band pass filters, two envelope detectors, and a decision circuit. ![]() The synchronous detector is a coherent one, while asynchronous detector is a non-coherent one. The main methods of FSK detection are asynchronous detector and synchronous detector. There are different methods for demodulating a FSK wave. The binary input sequence is applied to the transmitter so as to choose the frequencies according to the binary input. To avoid the abrupt phase discontinuities of the output waveform during the transmission of the message, a clock is applied to both the oscillators, internally. The two oscillators, producing a higher and a lower frequency signals, are connected to a switch along with an internal clock. The FSK modulator block diagram comprises of two oscillators with a clock and the input binary sequence. To find the process of obtaining this FSK modulated wave, let us know about the working of a FSK modulator. The following image is the diagrammatic representation of FSK modulated waveform along with its input. The binary 1s and 0s are called Mark and Space frequencies. ![]() The output of a FSK modulated wave is high in frequency for a binary High input and is low in frequency for a binary Low input. Frequency Shift Keying (FSK) is the digital modulation technique in which the frequency of the carrier signal varies according to the digital signal changes.
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