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A comment on Notes on Resonance. Parent comment

Re:Notes on Resonance by gugagore on Saturday April 14, 2018 @01:35PM (#16838355)
time domain multiplication is frequency domain convolution. Which is great if you want to shift the frequency band of some signal. Like if you have 2 songs that you want to play over radio in the same, shared airspace, you shift them to two different frequency bands. This happens electrically/RF-ly as a multiplication.
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Re:Notes on Resonance by tzahola on Saturday April 14, 2018 @01:57PM (#16838501)
I know this, but how does it relate to resonance in physical systems?

E.g. imagine a rigid pendulum driven by a sinusoidal torque at its pivot point. Which signals are multiplied here??

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Re:Notes on Resonance by lpmay on Saturday April 14, 2018 @08:41PM (#16840433)
Mixers are physical systems. The precise words for the distinction you are trying to make is between linear and non linear systems.
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