- A ring modulation signal flow diagram is shown in Fig. 6.
- We can use complex exponential notation to determine the resulting spectrum of the following sinusoidal ring modulation example:

- We thus see that the sum of two sinusoids can be written as a product:

where and . - Note that this is equivalent to applying a sinusoidal amplitude envelope to a carrier oscillator.
- Also note the absence of the carrier frequency in the resulting spectrum.

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