FMdemodulatsioon

FMdemodulatsioon, also known as frequency demodulation, is a process used in radio communication to recover the original audio signal from a frequency modulated (FM) radio wave. In FM, the frequency of the carrier wave is varied in accordance with the instantaneous amplitude of the modulating signal. Demodulation is the reverse of this process, where the variations in frequency are converted back into an amplitude-varying signal.

There are several methods for FM demodulation. One common technique is the discriminator circuit, which utilizes tuned circuits to produce a voltage proportional to the frequency deviation. Another method is the phase-locked loop (PLL), a feedback control system that can track and demodulate the FM signal. Slope detection is a simpler but less linear method where an asymmetrical filter is used to convert frequency variations into amplitude variations.

The output of an FM demodulator is an analog voltage that mirrors the original audio signal. This recovered audio signal can then be amplified and sent to a speaker for reproduction. FM demodulation is crucial for receiving FM radio broadcasts, as well as in various other applications like television sound, wireless microphones, and some forms of data transmission. Its ability to reject amplitude noise makes it superior to amplitude modulation (AM) in many broadcasting scenarios.