4 ms·

I don’t know what kind of resonance this post is talking about, but I’ve never heard of time domain signals being multiplied in a physical system...

• gugagore 9y ago
  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.
  • tzahola 9y ago
    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??
    • lpmay 9y ago
      Mixers are physical systems. The precise words for the distinction you are trying to make is between linear and non linear systems.