I know that the equation of armonic motion depends on three parameters: amplitude, frequency, phase. When a radio is receiving a signal from another radio, they’re on the same wavelength, that’s measured by period/frequency; so I guess that’s a “fixed” variable, or at least a variable that doesn’t carry information, but permits to choose which signal to listen to.
So how does a wave transfer information? Is it because the other two parameters change (or at least its amplitude).
In: Engineering
* There are many types of wave modulation.
* One type is amplitude modulation.
* That works, basically the way you’ve described.
* The amplitude of the wave is changed over time in a way that matches the changing amplitude of say..an audio signal.
* However another common type is Frequency Modulation.
* So in that case the radio receiver doesn’t lock onto a single frequency, but rather a small range or “band” of frequencies.
* In that case, the transmitter slightly modifies the frequency of the wave and those modifications are what convey the information.
* So if you wanted to transmit audio, you would make the frequency slightly lower than normal when the audio wave is negative, and you’d make the frequency slightly higher when the audio wave is positive.
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