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arXiv · 2005.05551

FeatherWave: An efficient high-fidelity neural vocoder with multi-band linear prediction

Qiao Tian·Zewang Zhang·Heng Lu·Ling-Hui Chen·Shan Liu
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Abstract

In this paper, we propose the FeatherWave, yet another variant of WaveRNN vocoder combining the multi-band signal processing and the linear predictive coding. The LPCNet, a recently proposed neural vocoder which utilized the linear predictive characteristic of speech signal in the WaveRNN architecture, can generate high quality speech with a speed faster than real-time on a single CPU core. However, LPCNet is still not efficient enough for online speech generation tasks. To address this issue, we adopt the multi-band linear predictive coding for WaveRNN vocoder. The multi-band method enables the model to generate several speech samples in parallel at one step. Therefore, it can significantly improve the efficiency of speech synthesis. The proposed model with 4 sub-bands needs less than 1.6 GFLOPS for speech generation. In our experiments, it can generate 24 kHz high-fidelity audio 9x faster than real-time on a single CPU, which is much faster than the LPCNet vocoder. Furthermore, our subjective listening test shows that the FeatherWave can generate speech with better quality than LPCNet.

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Qiao Tian, Zewang Zhang, Heng Lu, Ling-Hui Chen, Shan Liu. 2020-05-12. FeatherWave: An efficient high-fidelity neural vocoder with multi-band linear prediction. https://arxiv.org/abs/2005.05551

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