Vall-E Ai

Neural Codec Language Models are Zero-Shot Text to Speech Synthesizers

Chengyi Wang*,   Sanyuan Chen*,   Yu Wu*,   Ziqiang Zhang,   Long Zhou,   Shujie Liu,  
Zhuo Chen,   Yanqing Liu,   Huaming Wang,   Jinyu Li,   Lei He,   Sheng Zhao,   Furu Wei



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We introduce a language modeling approach for text to speech synthesis (TTS). Specifically, we train a neural codec language model (called VALL-E) using discrete codes derived from an off-the-shelf neural audio codec model, and regard TTS as a conditional language modeling task rather than continuous signal regression as in previous work. During the pre-training stage, we scale up the TTS training data to 60K hours of English speech which is hundreds of times larger than existing systems. VALL-E emerges in-context learning capabilities and can be used to synthesize high-quality personalized speech with only a 3-second enrolled recording of an unseen speaker as an acoustic prompt. Experiment results show that VALL-E significantly outperforms the state-of-the-art zero-shot TTS system in terms of speech naturalness and speaker similarity. In addition, we find VALL-E could preserve the speaker’s emotion and acoustic environment of the acoustic prompt in synthesis.

AI Technology for powerful experiences

Developed by Microsoft, VALL-E can take a three-second recording of someone’s voice, and replicate that voice, turning written words into speech, with realistic intonation and emotion depending on the context of the text. Trained with 60,000 hours worth of English speech recordings, it can deliver a speech in a "zero-shot situation," which means without any prior examples or training in a specific context or situation.

How VALL-E works?

We randomly selected some transcriptions and 3s audio segments from LibriSpeech test-clean set as the text and speaker prompts and then use VALL-E to synthesize the personalized speech. Note that the transcriptions and audio segments are from different speakers, there is no ground truth speech for reference

Since VALL-E could synthesize speech that maintains speaker identity, it may carry potential risks in misuse of the model, such as spoofing voice identification or impersonating a specific speaker. We conducted the experiments under the assumption that the user agree to be the target speaker in speech synthesis. If the model is generalized to unseen speakers in the real world, it should include a protocol to ensure that the speaker approves the use of their voice and a synthesized speech detection model.

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