Digital signal processing (DSP)

This category includes tasks where input data types are signals, time series, and audio. The sources of the data are sensors, HealthKit, microphone, wearable devices (for example, Apple Watch, or brain-computer interfaces), and IoT devices. Examples of ML problems here include:

• Motion sensor data classification for activity recognition
• Speech recognition and synthesis
• Music recognition and synthesis
• Biological signals (ECG, EEG, and hand tremor) analysis

We will build a motion recognition app in Chapter 3, K-Nearest Neighbors Classifier.