How Voice Assistants Understand What You Say

You say a few words, and your speaker plays a song or reads the weather. Several technologies work together in that short pause.

Step 1: Waiting for the wake word

The device listens locally for a specific phrase. A small program on the device checks the sound for that phrase, and only after it is detected does the recording start being sent for processing.

Step 2: Turning speech into text

Speech recognition converts the audio of your voice into written words. It must cope with accents, background noise and fast speech, which is why it is trained on huge sets of recordings.

Step 3: Understanding intent

A language system works out what you want: play music, set a timer, answer a question. It also pulls out details such as the song name or the length of the timer.

Step 4: Doing the task

The assistant connects to a service, such as a music app or a smart bulb, or looks up information.

Step 5: Speaking the answer

Text-to-speech software turns the reply into a natural voice.

Privacy tips

• Check whether recordings are saved and delete them regularly.
• Use the physical mute button when you want to be sure the microphone is off.
• Review which services and accounts are linked.
• Place devices away from private spaces such as bedrooms if you are uneasy.

Voice assistants are convenient, and a few settings let you keep that convenience while controlling your data.