amplitúdómodulációnál

Amplitúdómoduláció or AM is a modulation technique used in electronic communication, most notably in the broadcasting of radio signals. In amplitude modulation, the amplitude of a carrier wave is varied in proportion to the message signal being transmitted. The carrier wave is a high-frequency electromagnetic wave that is relatively constant in frequency and phase. The message signal, which could be audio or other data, is the information that needs to be sent.

The process of amplitude modulation involves combining the carrier wave and the message signal. This combination results in a new waveform whose amplitude fluctuates according to the variations in the message signal. At the receiving end, a demodulator is used to extract the original message signal from the modulated carrier wave. This is typically achieved by rectifying the modulated signal and then filtering out the carrier frequency.

Amplitude modulation is relatively simple to implement, both for transmission and reception. This simplicity was a key factor in its early widespread adoption for radio broadcasting. However, AM signals are susceptible to noise and interference, which can distort the demodulated signal. The amplitude variations in AM are directly proportional to the message signal, meaning that any fluctuations in the carrier wave's amplitude caused by external factors will be interpreted as part of the original message. This makes AM less robust in noisy environments compared to other modulation techniques like frequency modulation (FM). Despite its limitations, amplitude modulation remains a fundamental concept in telecommunications and is still used in various applications.