Analoogdemodulatsioon

Analoogdemodulatsioon, also known as analog demodulation, is a process used in telecommunications and signal processing to recover the original information signal from a modulated carrier wave. Modulation is the process of encoding information onto a carrier signal, typically by altering its amplitude, frequency, or phase. Demodulation is the reverse process, extracting this information from the modulated carrier.

In analog demodulation, the carrier wave's varying property (amplitude, frequency, or phase) is detected and translated back into a time-varying analog signal that represents the original data. Common analog demodulation techniques include amplitude demodulation (AM demodulation), frequency demodulation (FM demodulation), and phase demodulation (PM demodulation). Each method is suited for different types of modulated signals and applications.

For instance, AM demodulation typically involves a rectifier and a low-pass filter to isolate the audio or data signal from the high-frequency carrier. FM demodulation often uses a frequency discriminator or a phase-locked loop (PLL) to convert frequency variations back into amplitude variations. PM demodulation similarly employs a phase detector or a PLL to track and recover the original signal's phase changes.

The effectiveness of analog demodulation is crucial for the accurate reception of analog broadcasts like radio and television, as well as for various analog communication systems. The quality of the demodulated signal is influenced by factors such as noise, interference, and the linearity of the demodulator circuit.