Glossary
Text-to-Speech (TTS)
Definition, how it works, and why it matters for service businesses.
Text-to-speech, or TTS, is the technology that turns written text into spoken audio, and it's the half of a voice AI system responsible for how it actually sounds to a caller. Modern TTS engines produce voices that sound close to a real person rather than the robotic, clipped audio people associate with older automated phone systems.
How it works
A TTS engine takes a string of text — a scripted greeting, or a sentence the AI generates dynamically based on the conversation — and synthesizes an audio waveform with natural pacing, intonation, and pauses, streaming it to the caller in real time as the exchange unfolds.
Why it matters for service businesses
The quality of a TTS voice shapes whether a caller trusts they're getting real help or assumes they've hit a dead-end robot and hangs up; for a home-service business, a natural-sounding voice that can calmly walk someone through what to do about a gas smell or a burst pipe matters almost as much as the words being said.
Example
When Callbook tells a caller "I understand this is urgent — let me get your address and get a technician notified right away," the TTS engine has to deliver that line in a tone that sounds reassuring rather than flat or synthetic, especially to someone already stressed about a home emergency.
Related terms
- Voice AIArtificial intelligence specifically designed to understand and generate human speech. Voice AI powers modern phone receptionists, enabling natural conversations, understanding accents, and responding appropriately to caller emotions.
- Speech RecognitionTechnology that converts spoken words into text. In phone systems, speech recognition enables callers to speak naturally rather than pressing buttons, making interactions faster and more accessible.
- Conversational AIArtificial intelligence technology that enables natural, human-like conversations between computers and people. In phone systems, conversational AI powers virtual receptionists that can understand context, handle complex queries, and respond naturally.
- Natural Language Processing (NLP)AI technology that enables computers to understand, interpret, and respond to human language. In phone systems, NLP allows callers to speak naturally rather than navigating rigid menu structures.
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