Frequency-shift Keying (FSK)

Frequency-shift Keying (FSK) is a form of frequency modulation which is used in cables to transmit digital data. It utilizes two frequencies, one for the “1” bit and one for the “0” bit. When the signal is sent, the frequency is shifted between the two predetermined frequencies to encode the data.

The advantage of FSK over other forms of modulation is that it makes use of fewer frequencies, which makes it easier to transmit over long distances. This is especially useful in cables, as cables have limited bandwidth, which can make it difficult to send multiple signals simultaneously. FSK also requires less power than other forms of modulation, making it more energy-efficient.

FSK is used in a variety of applications, from remote control devices to cable television. It is also used in telecommunication systems, such as modems and faxes. FSK is also used in radio systems, such as satellite communication, to send signals over long distances.

When using FSK, the transmitter must be able to accurately differentiate between the two frequencies. This is done by using a frequency discriminator, which is a device that is able to detect the difference between the two frequencies. The frequency discriminator is typically used in conjunction with a modulator, which is used to modulate the signal so that it can be sent over the cable.

In addition to the frequency discriminator, the cable must be properly shielded to ensure the signal is accurately transmitted. This is done by using a ferrite core, which acts as a shield against external interference.

Overall, Frequency-shift Keying (FSK) is an effective and efficient way to transmit digital data over cables.