This is an introduction to how computers turn spoken words into text (STT) and written text back into a voice (TTS).

How Machines Hear and Talk

Computers cannot hear air; they use a converter to turn sound vibrations into a digital language made of numbers.

Turning Vibrations into Numbers

The AI breaks words down into 'phonemes,' which are the tiny, distinct sounds that make up every language.

Acoustic models act like a translator that matches the physical sound of a voice to specific letters and characters.

Language models use context and grammar to decide if you meant 'there,' 'their,' or 'they're' based on surrounding words.

This technology allows a device to ignore everything you say until it hears a specific phrase, like 'Hey Alexa' or 'OK Google.'

Digital filters help the computer ignore loud fans or traffic so it can focus only on the speaker's voice.

AI is trained on thousands of different voices to ensure it can understand people from all over the world.

Text-to-speech (TTS) is a type of 'assistive technology' that takes written documents and reads them aloud for the user.

AI uses voice synthesis to build a digital persona that sounds remarkably like a real human rather than a robotic machine.

Modern voice systems can instantly switch between dozens of languages, allowing for real-time translation during conversations.

Voice technology helps people with vision or movement challenges use phones and computers without needing a screen or keyboard.

AI can listen to live videos or meetings and automatically generate written text at the bottom of the screen in real-time.

Because your voice is unique to you, developers use security tools to ensure your recorded data remains private and protected.