![]() ![]() An un-modulated FM wave might look like:Īnd a modulated FM radio wave has higher and lower frequencies indicating higher and lower audio frequencies in the signal:įrom left to right, we have the normal, un-modulated wave, then the lower frequency wave (representing lower audio amplitudes), then the higher frequency wave (representing higher audio amplitudes). The F in FM comes from Frequency - defined by how quickly the wave vibrates every second. The audio signal is the wave on the top, with the corresponding Amplitude Modulated wave below it.Įxample two: FM radio. An un-modulated AM wave might look like:Īnd a modulated AM radio wave has higher and lower energy (amplitude) waves indicating higher and lower audio frequencies in the signal:įrom left to right, we have the normal, un-modulated wave, then the lower amplitude wave (representing low points in audio waves), then the higher amplitude wave (representing crests or high points in audio waves).Ī more detailed version of an AM signal is below: The A in AM comes from Amplitude - the energy or strength of the signal, operating at a single frequency. ![]() The type of modulation is what makes them different.Įxample one: AM radio. In the two examples below - AM and FM radio - the M stands for modulation. There are many types of modulation, and different technologies can use one or more types to send and receive information. A wireless signal needs to be modulated-or changed-to send information. In addition to having different frequencies, wireless signals can be different in the way they convey information.
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