6. Introduction

The DA1470x is equipped with a new feature, the Voice Activity Detection (VAD) enabling, seamless audio processing with ultra-low power consumption. It lets the System on Chip (SoC) stay in sleep mode until enough audible energy has been sensed, triggering an interrupt assertion and consequently waking up the rest of the SoC An overview of the system is shown in figure below.

Figure 1 System overview

An externally placed analog or digital microphone is connected to the VAD block that will detect voice activity. The VAD will issue an interrupt to the Power Domain Controller (PDC) which is responsible for waking up the system.

When the M33 is woken up, program execution is started and audio samples from the AppADC are stored in RAM for further processing. The application will retrieve these samples to eventually perform “word spotting” and act accordingly if a valid command is detected.

Cyberon DSpotter is a local voice trigger and command recognition solution that will be used in this example application.