Speech recognition and fitness tracker: what they have in common

1. Step 1. Speech recognition — uses — Artificial neural network. Neural networks.
2. Step 2. Artificial neural network — is used in — Perceptron. The first trainable neural network.
3. Step 3. Perceptron — has part — Photodiode. Photocells read the image.
4. Step 4. Photodiode — is part of — Pulse oximeter. A photodiode.
5. Step 5. Pulse oximeter — is part of — Fitness tracker. An optical heart-rate sensor.

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