# Original Frequencies

### Some articles on frequencies, original frequencies:

Heterodyne - Mathematical Principle - Output of A Mixer
... multiply signals and generate heterodyne frequencies, the nonlinear function F can be expanded in a power series (MacLaurin series) To simplify the math ... Applying the two sine waves at frequencies ω1 = 2πf1 and ω2 = 2πf2 to this device It can be seen that the second term above contains a product of the two sine waves ... Simplifying with trigonometric identities So the output contains sinusoidal terms with frequencies at the sum ω1 + ω2 and difference ω1 - ω2 of the two original frequencies ...

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