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Frequency and phase modulation or just angle modulation.
Both have a lot in common.
Compared to amplitude modulation, there are a number of advantages, but also some disadvantages.
Here you will learn a lot about the principle and you will get a brief overview of the circuit technology behind it.
0:00 - introduction
0:43 - Principle and comparison of FM and PM
4:31 - bandwidth
8:03 - modulation
11:25 - demodulation
17:20 - pros and cons