FSK, or Frequency-Shift Keying, is a digital modulation technique used in telecommunications and data transmission. It is an encoding scheme that involves altering the frequency of a carrier signal to represent digital information. FSK works by shifting the frequency of the carrier signal between two predetermined frequencies, usually referred to as the mark frequency and the space frequency.
In FSK modulation, each symbol or bit of digital data is represented by a distinct frequency. A binary '1' is typically represented by a carrier frequency at the mark frequency, while a binary '0' is represented by a carrier frequency at the space frequency. The shift between these two frequencies occurs at a predefined rate, often referred to as the baud rate.
FSK is commonly used in various applications, such as radio and wireless communication systems, computer modems, and RFID (Radio Frequency Identification) systems. It offers advantages like efficient use of bandwidth, robustness against noise and interference, and compatibility with existing transmission and reception equipment.
The decoding process in FSK involves analyzing the received signal and detecting the frequency shifts to interpret the transmitted information correctly. This is typically done using dedicated demodulation circuits or software algorithms. The resulting decoded signals can then be further processed and utilized by the receiving device or system.
Overall, FSK provides a reliable and efficient way of transmitting digital data over analog communication channels, making it a fundamental modulation technique in modern communication systems.
