Wireless charging and sonar: what they have in common

1. Step 1. Wireless charging — is used in — Smartphone. Wireless charging.
2. Step 2. Smartphone — has part — Digital signal processor. Processing sound and images.
3. Step 3. Digital signal processor — is part of — Ultrasound scanner. Forming the image.
4. Step 4. Ultrasound scanner — works like — Sonar. A medical sonar: the same echo principle.

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