index-tts/index-tts

An Industrial-Level Controllable and Efficient Zero-Shot Text-To-Speech System

What it solves

IndexTTS is a zero-shot text-to-speech (TTS) system designed to clone a specific voice using only a single reference audio clip. It addresses the need for high-fidelity, controllable voice synthesis across multiple languages without requiring extensive training data for each new voice.

How it works

The system uses an autoregressive model to synthesize speech. It allows users to provide a reference audio clip for timbre (the unique quality of a voice) and optionally a separate emotional reference audio or an emotion vector to control the mood of the speech. The latest version, IndexTTS-2.5, supports Chinese, English, Japanese, Spanish, and Arabic, and incorporates fine-grained controls for speaking speed and pronunciation via phonemes (Pinyin, CMU, and Japanese Kana).

Who it’s for

This tool is intended for developers and researchers looking for an industrial-level TTS system that supports multilingual cloning, precise emotional expression, and production-ready deployment (supported via vLLM).

Highlights

  • Zero-Shot Cloning: Clones a voice from a single audio sample.
  • Multilingual Support: Supports Chinese, English, Japanese, Spanish, and Arabic.
  • Fine-Grained Control: Offers control over emotion intensity, speaking speed (0.5x to 2.0x), and specific pronunciation using phonemes.
  • Flexible Emotion Input: Emotions can be controlled via reference audio, predefined emotion vectors, or automatically derived from the text itself.
  • Production Ready: Compatible with vLLM for efficient serving.

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