Modem and conveyor belt: what they have in common

1. Step 1. Modem — has part — Digital signal processor. Signal processing in high-speed modems.
2. Step 2. Digital signal processor — uses — Fourier transform. Spectral processing.
3. Step 3. Fourier transform — is used in — Tide-predicting machine. A sum of harmonics.
4. Step 4. Tide-predicting machine — has part — Pulley. Pulleys add up the harmonics.
5. Step 5. Pulley — is part of — Belt drive. The belt wraps around pulleys.
6. Step 6. Belt drive — is used in — Conveyor belt. The belt runs around the drive and tension drums.

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