Active noise cancelling and personal computer: what they have in common

1. Step 1. Active noise cancelling — uses — Digital signal processor. Signal processing.
2. Step 2. Digital signal processor — is part of — Ultrasound scanner. Forming the image.
3. Step 3. Ultrasound scanner — has part — Monitor. A screen.
4. Step 4. Monitor — is part of — Personal computer. A monitor.

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