DSP & Communications
Your smart thermostat runs a PID control loop. Your doorbell camera runs an H.264 encoder at 30 fps. Your voice assistant runs a wake-word detector that fires 15 times per second on a model smaller than 500 KB. None of that is magic. All of it is digital signal processing (the same math that powered radar systems in the 1940s, running on chips that cost less than your coffee). We cover the signal chains inside the devices you already own, because the marketing copy won’t tell you how they actually work.
From ADC to action.
EG3 has covered signal processing and embedded communications since 1996. The fundamentals haven’t changed (Fourier transforms don’t expire). The applications have. A 512-point FFT that used to require a dedicated DSP chip now runs on a $3 ESP32 alongside WiFi and Bluetooth. We explain what that means for the devices in your home. Not the marketing version. The actual signal chain, from analog input to digital output.