Skip to main content

Voices (Text-to-Speech)

Overview of TTS in Votel​

While Large Language Models (LLMs) form the "brain" of your AI agent, Text-to-Speech (TTS) systems bring it to life, giving it a voice that sounds human, expressive, and emotionally intelligent. In Votel, the TTS layer converts textual responses generated by the LLM into high-quality, natural-sounding speech in real time.

By integrating with world-class TTS providers like ElevenLabs, OpenAI, and Cartesia., Votel enables developers to design agents that don't just speak, but connect with users. Each integration brings its own unique strengths, ranging from hyper-realistic emotional delivery to ultrafast real-time streaming.

ElevenLabs Integration​

What Is ElevenLabs?​

ElevenLabs is one of the most advanced voice synthesis platforms available today, known for creating lifelike, expressive, and emotionally rich voices. Its deep learning-based TTS models analyze not only the words but also the tone, rhythm, and emotional context, producing speech that feels truly human.

How ElevenLabs Works With Votel​

Votel integrates directly with ElevenLabs' real-time speech synthesis API, allowing seamless streaming of voice output during live conversations. When your AI agent generates a response, Votel passes that text to ElevenLabs, which instantly converts it into high-fidelity audio, giving users a fluid, interruption-free experience.

Key Features​

  • Voice Realism: Produces natural tone, cadence, and human-like emotion.
  • Custom Voices: Create unique voices tailored to brand identity or character personas.
  • Dynamic Emotions: Adjust tone, energy, and style based on context.
  • Low Latency: Optimized for live dialogue without awkward pauses.
  • Multilingual Support: Speak in multiple languages with consistent quality.

Benefits​

  • Enhances user trust and engagement through natural voice delivery.
  • Reduces robotic monotony in long conversations.
  • Offers flexibility to match brand tone and personality.
  • Ideal for voice assistants, IVRs, and branded agents.

Developer Integration​

Developers can easily integrate ElevenLabs with Votel using the provided API hooks and SDKs. Votel manages buffering and adaptive bitrate streaming to ensure smooth voice output and minimal delay.

Use Cases​

  • Empathetic customer service agents.
  • Branded AI receptionists or call assistants.
  • Multilingual support bots and IVRs.
  • Narration or voice-over generation for marketing and e-learning.

OpenAI Voices​

What Are OpenAI Voices?​

OpenAI's native voice models combine clarity, natural prosody, and optimized performance, ideal for real-time applications that require both speed and quality. They are tightly integrated into the same ecosystem as OpenAI's LLMs, minimizing the delay between thinking (LLM) and speaking (TTS).

How OpenAI Voices Work With Votel​

Because both the reasoning (LLM) and speaking (TTS) models come from OpenAI, Votel benefits from a unified, low-latency pipeline. The result: fast, coherent voice responses that maintain contextual accuracy and flow naturally, even in back-and-forth dialogue.

Key Features​

  • Fast Response Times: Seamless real-time streaming.
  • Consistent Tone: Neutral, professional-sounding voices suitable for general-purpose agents.
  • Integrated with LLMs: Reduces handoff latency for quicker responses.
  • High Fidelity: Balanced voice clarity and natural delivery.

Benefits​

  • Ideal for transactional or neutral-tone agents.
  • Ensures synchronized voice output with LLM responses.
  • Optimized for large-scale, fast-paced environments.

Use Cases​

  • Virtual assistants and smart IVRs.
  • AI-driven notifications or status updates.
  • Conversational helpdesk bots and information systems.
  • Real-time in-app voice interactions.

Cartesia Integration​

What Is Cartesia?​

Cartesia is an advanced, next-generation voice synthesis platform that merges realism, speed, and creative flexibility. It goes beyond traditional Text-to-Speech by introducing multimodal intelligence, enabling AI voices that express emotion, adapt to context, and even blend sound or background elements for immersive experiences. In Votel, Cartesia powers agents capable of real-time, human-like conversations that sound natural, emotionally aware, and highly responsive.

How Cartesia Voices Work With Votel​

When a Votel agent generates a text response using an LLM, Cartesia's real-time voice API instantly transforms that text into lifelike speech. Votel manages this interaction through an optimized streaming pipeline, ensuring ultra-low latency, smooth pacing, and synchronized dialogue flow. This allows your AI agent to react and respond just like a human speaker, maintaining tone consistency across long conversations.

Cartesia's integration with Votel includes:

  • Real-time streaming of high-quality voice output.
  • Adaptive pacing based on conversational tone and context.
  • Automatic handling of buffering and latency for seamless delivery.
  • Multi-language and accent support for global deployments.

Key Features​

  • Real-time Synthesis: Converts text to natural speech in milliseconds, ideal for live interactions.
  • Expressive Control: Adjust tone, pitch, and emotion dynamically to fit conversation mood.
  • Multilingual Support: Offers multiple accents and languages with consistent quality.
  • Low Latency Streaming: Built for fast-paced conversations and live dialogue.
  • Scalability: Designed to handle thousands of concurrent sessions efficiently.
  • Developer-Ready API: Simple REST and WebSocket APIs for quick integration into Votel agents.

Benefits​

  • Enables lifelike, emotionally intelligent voice conversations.
  • Reduces delay between LLM response and voice delivery.
  • Supports multilingual and accent-rich speech for diverse audiences.
  • Provides immersive, natural voice experiences that enhance engagement.
  • Ideal for both enterprise and creative applications requiring high-quality, fast voice output.

Use Cases​

  • Customer Support Agents: Real-time, empathetic voice communication for users.
  • Virtual Hosts or Event Announcers: Engaging, natural-sounding narrators for live events.
  • Marketing and Branding: Emotionally resonant, branded voiceovers for campaigns.
  • E-learning and Training: Clear, adaptive voice narration for educational content.
  • Entertainment and Storytelling: Expressive, cinematic voices for interactive media.