Angle Modulation
 Phase Modulation & Frequency Modulation
  To give an overview of two angle modulation methods (phase modulation and frequency modulation).
A very simplistic difference between phase and frequency modulation is shown in this illustration.

A mathematical representation of phase modulation is obtained and a definition of the modulation index b is shown. The modulation index is independent of the frequency of the modulating signal.

Similarly a mathematical definition of frequency modulation can be obtained. This also has a modulation index b, but in this case the modulation index depends on the frequency of the modulating signal.
Summarises the differences between phase modulation and frequency modulation.
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