Frequency shift keying (FSK) is a modulation method that uses carrier frequency changes to transmit digital information. FSK encodes different digital information by changing the frequency of the carrier and is mainly used in medium and low-speed data transmission. Its basic principle is to use the frequency change of the carrier to transmit digital information, and this change is discrete rather than continuous.
Working principle of FSK
The basic principle of FSK is to use two different frequencies to represent "0" and "1" in binary data respectively. Specifically, when sending binary "0", one frequency is used; when sending binary "1", another frequency is used. This change in frequency allows the receiver to decode the data by detecting different frequencies.
Advantages and disadvantages of FSK
Advantages:
Simple implementation: FSK modulation and demodulation methods are relatively simple and easy to implement.
Strong anti-noise ability: Due to the spectral characteristics of FSK signals, it performs well in noisy environments.
Asynchronous transmission: FSK can support asynchronous transmission and is suitable for transmission at different data rates.
Disadvantages:
Low bandwidth utilization: The bandwidth required for the phase-discontinuous FSK signal is three times that of the ASK signal, so the bandwidth utilization is low.
Application scenarios of FSK
FSK is widely used in low-speed data transmission equipment, especially for data transmission on analog telephone networks. Due to its good anti-noise and anti-attenuation performance, FSK is widely used in scenarios that require stable transmission quality.
