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CLaM-TTS: Improving Neural Codec Language Model for Zero-Shot Text-to-Speech

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arxiv 2404.02781 v1 pith:6CHWYJH3 submitted 2024-04-03 eess.AS cs.SD

CLaM-TTS: Improving Neural Codec Language Model for Zero-Shot Text-to-Speech

classification eess.AS cs.SD
keywords languageaudioclam-ttsmodelsmultipleneurallengthmodel
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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With the emergence of neural audio codecs, which encode multiple streams of discrete tokens from audio, large language models have recently gained attention as a promising approach for zero-shot Text-to-Speech (TTS) synthesis. Despite the ongoing rush towards scaling paradigms, audio tokenization ironically amplifies the scalability challenge, stemming from its long sequence length and the complexity of modelling the multiple sequences. To mitigate these issues, we present CLaM-TTS that employs a probabilistic residual vector quantization to (1) achieve superior compression in the token length, and (2) allow a language model to generate multiple tokens at once, thereby eliminating the need for cascaded modeling to handle the number of token streams. Our experimental results demonstrate that CLaM-TTS is better than or comparable to state-of-the-art neural codec-based TTS models regarding naturalness, intelligibility, speaker similarity, and inference speed. In addition, we examine the impact of the pretraining extent of the language models and their text tokenization strategies on performances.

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