In Frequency Shift Keying (FSK) modulation, the carrier frequency is switched between two frequencies based on _______.

In Frequency Shift Keying (FSK) modulation, the carrier frequency is switched between two frequencies based on:

The correct answer is option 2: whether a binary 1 or 0 is sent.

Additional Information 

Frequency Shift Keying (FSK) is a method of digital signal modulation in which the frequency of a carrier signal is varied in accordance with the digital signal data. In simpler terms, FSK uses different frequencies to represent different data values. This method is particularly useful for transmitting digital data over analog communication channels. The primary reason for using FSK modulation is its robustness in the presence of noise compared to other modulation techniques like amplitude modulation (AM) or phase modulation (PM).

In FSK modulation, the carrier frequency is switched between two or more discrete frequencies based on whether a binary '1' or '0' is being transmitted. This means:

• When the digital signal is a binary '1', the carrier frequency shifts to a higher frequency, typically referred to as the mark frequency.
• When the digital signal is a binary '0', the carrier frequency shifts to a lower frequency, typically referred to as the space frequency.

This frequency variation allows the transmission of digital data over analog systems efficiently. The receiver must be capable of distinguishing between the different frequencies to decode the transmitted binary information. One of the most common applications of FSK is in modem technology, where it is used to transmit data over telephone lines.

FSK modulation has several advantages, including:

• FSK signals are less susceptible to noise and distortion compared to amplitude-based modulation techniques.
• The implementation of FSK modulation and demodulation is straightforward and does not require complex hardware.
• FSK provides reliable data transmission, especially in environments where signal integrity is a concern.