What is FSK modem?
Frequency-shift keying (FSK) is a frequency modulation scheme in which digital information is transmitted through discrete frequency changes of a carrier signal.
Is FSK used in modem?
A modem converts the binary data from a computer to FSK for transmission over telephone lines, cables, optical fiber or wireless media. The modem also converts incoming FSK signals to digital low and high states, which the computer can understand from a binary standpoint.
What is the working principle of FSK?
FSK is a scheme of frequency modulation. 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. The binary 1s and 0s are called Mark and Space frequencies.
What is the difference between standard FSK and MSK?
The difference between them is that MSK unlike FSK is a particular form of Continuous- Phase FSK where the frequency of the carrier signal is changed by the input data exactly at the zero crossing of the signal, therefore avoiding phase discontinuities, which is the advantage of the MSK compared to FSK.
Is FSK digital or analog?
A digital signal, representing the binary digits 0 and 1 by a series of on and off amplitudes, is impressed onto an analog carrier wave of constant amplitude and frequency.
Which IC is used for FSK demodulation?
FSK demodulator using NE-SE 565 IC A very useful application of the 565 PLL is as a FSK demodulator. In the 565 PLL the frequency shift is usually accomplished by driving a VCO with the binary data signal so that the two resulting frequencies correspond to the logic 0 and logic 1 states of the binary data signal.
What is the most commonly used demodulation technique for FSK?
PLL circuit
The most used demodulation technique is the one using a PLL circuit (fig. 2). The FSK signal across the PLL input takes two frequency values.
What is the bandwidth of FSK?
The bandwidth of the periodic FSK signal is then 2f + 2B, with B the bandwidth of the baseband signal. The bit error probability can be shown to be pϵ = 1 2 e−E/2η , which under normal operating conditions corresponds to less than a 1dB penalty over coherent detection.
How is FSK bandwidth calculated?
A rectangular-pulse polar baseband signal is used to modulate an RF carrier in FSK. If the baseband signal has a data rate of 200 kbit/sec and the two RF frequencies are 150 kHz apart, determine the bandwidth. 2f + 2B = 150 kHz + 200 kHz = 350 kHz.