The Difference Between AM and FM Radio Explained
When it comes to radio broadcasting, there are two major types of radio signals: AM and FM. While anyone can tune into both types and enjoy their favorite music or talk shows, there are distinct differences between AM and FM radio that are worth understanding.
AM Radio
AM stands for Amplitude Modulation, which refers to the way in which the audio signal is broadcasted. Simply put, an AM radio station sends its signal by changing the amplitude (or the height) of the radio wave to correspond to the sound being broadcasted. The changes in amplitude are then converted back into audio signals by the radio receiver, which then produces sound.
One limitation of AM radio is that it is subject to interference from other electrical devices, such as power lines or fluorescent lights. Additionally, AM signals tend to be more susceptible to static and interference than FM signals. Notably, AM radio broadcasts often have a more “hollow” or “echoey” quality than FM broadcasts.
FM Radio
FM stands for Frequency Modulation, which refers to the way in which the audio signal is broadcasted. Rather than changing the amplitude of the radio wave, an FM radio station sends its signal by altering the frequency (or the number of waves per second) of the radio wave. As a result, FM signals tend to be less prone to interference than AM signals, which makes for clearer and more consistent broadcasts.
FM radio is also capable of producing higher quality audio than AM radio. Specifically, FM radio has a wider frequency range than AM radio, which allows for more detailed and nuanced sound reproduction. FM radio stations can also broadcast in stereo, which means that listeners can enjoy a richer, more immersive audio experience.
Conclusion
In summary, AM and FM radio are two distinct types of radio broadcasting. While AM radio broadcasts by changing the amplitude of the radio wave, FM radio broadcasts by changing the frequency. FM radio tends to be less prone to interference and produces higher quality audio than AM radio, but AM radio may be more readily available in some areas. Ultimately, the choice between AM and FM radio will depend on your listening preferences and your local radio offerings.
Table difference between am and fm
| AM | FM |
|---|---|
| Amplitude modulation – the amplitude of the radio signal varies to carry information | Frequency modulation – the frequency of the radio signal varies to carry information |
| Better for long distance communication due to its ability to travel farther and penetrate obstacles better | Better for short distance communication due to its ability to provide better sound quality and resistance to interference |
| Susceptible to interference from other radio signals | Less susceptible to interference from other radio signals |
| Commonly used for talk radio, news, and sports broadcasting | Commonly used for music and entertainment broadcasting |