AI / Voice
Text-to-Speech (TTS)
Text-to-Speech (TTS) converts written text into spoken audio, producing the voice a caller hears from an automated or AI-driven system.
Text-to-Speech (TTS) converts written text into spoken audio, producing the voice a caller hears from an automated or AI-driven system.
Text-to-Speech, or TTS, converts written text into spoken audio. In a voice agentVoice agentA voice agent is a conversational software system that listens, responds, follows a defined workflow, and can take approved actions during a phone conversation., the response may come from a fixed script, a language model, retrieved information, or a connected system. TTS renders that response in the selected voice so the caller can hear it over the phone.
What TTS controls
A text-to-speech model influences pronunciation, pace, tone, pauses, and time to first audio. The selected voice and language must suit the audience and the content. TTS does not decide what the agent says or whether the information is correct. Conversation logic, prompts, data, and guardrailsGuardrailsAI guardrails are instructions, rules, data boundaries, and escalation paths that constrain what an agent may say or do. make those decisions before speech is generated. Thoughtly's voice settings let teams choose and preview a voice, set language, and tune voice behavior.
Practical use cases
- Deliver dynamic qualification or scheduling responses during a live call.
- Read exact confirmations, required messages, or next-step instructions.
- Use a consistent licensed or authorized cloned voice across calls.
- Support callers in the configured language and speaking style.
Real-call testing matters because written text can sound awkward when spoken. Teams should listen for names, acronyms, phone numbers, dates, long sentences, interruptions, and unnatural pauses. Thoughtly's Speak nodes also provide options for verbatim delivery, uninterrupted lines, and spelling numbers when precision matters.
Frequently asked questions
Is TTS the same as an AI voice?
TTS is the speech-generation process or model. AI voiceAI voiceAn AI voice is synthetic speech produced by a text-to-speech model, using a selected or cloned voice to speak an agent's generated or scripted response. usually refers to the audible voice identity and output created by that process.
Does realistic speech make an agent accurate?
No. Natural sound and factual accuracy are separate. The response still needs approved content, reliable logic, and appropriate guardrails.