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Amplitude modulation
/ˈamplɪtjˌuːd mˌɒdjʊlˈeɪʃən/
/ˈæmplɪtˌuːd mˌɑːdʒuːlˈeɪʃən/
AMAmplitude modulation
01
振幅変調, AM変調
one of the main methods of radio broadcasting with a lower sound quality than FM
What is "amplitude modulation"?
Amplitude modulation (AM) is a method of transmitting radio signals by varying the strength or height of the radio wave. In AM radio, the audio signal changes the amplitude, or power, of the carrier wave, while the frequency remains constant. This technique is commonly used for speech and talk radio, but it is more affected by interference from noise and weather conditions compared to frequency modulation (FM). AM signals can travel long distances, making them ideal for reaching wide areas, but the sound quality is often less clear than FM.
Example
The AM signal fades out when driving through areas with poor reception.
The weather is causing some interference with the AM radio signal, making it hard to hear clearly.
AM radio works well over long distances, which is why it's commonly used by news stations.
