Polyvinyl chloride (PVC) and modem: what they have in common

1. Step 1. Polyvinyl chloride (PVC) — is material for — Vinyl record. Vinyl is PVC.
2. Step 2. Vinyl record — evolved into — Compact disc. A digital replacement for the record.
3. Step 3. Compact disc — uses — Binary number system. Sound is recorded as numbers.
4. Step 4. Binary number system — is used in — Digital signal processor. It processes a digital signal.
5. Step 5. Digital signal processor — is part of — Modem. Signal processing in high-speed modems.

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