Fourier transform and electric generator: what they have in common

1. Step 1. Fourier transform — is used in — Digital signal processor. Spectral processing.
2. Step 2. Digital signal processor — is used in — Active noise cancelling. Signal processing.
3. Step 3. Active noise cancelling — is used in — Headphones. Noise-cancelling headphones.
4. Step 4. Headphones — has part — Copper wire. A cable.
5. Step 5. Copper wire — is part of — Electric generator. Windings.

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