Speaker-independent Raw Waveform Model for Glottal Excitation

Lauri Juvela, Vassilis Tsiaras, Bajibabu Bollepalli, Manu Airaksinen, Junichi Yamagishi, Paavo Alku

Recent speech technology research has seen a growing interest in using WaveNets as statistical vocoders, i.e., generating speech waveforms from acoustic features. These models have been shown to improve the generated speech quality over classical vocoders in many tasks, such as text-to-speech synthesis and voice conversion. Furthermore, conditioning WaveNets with acoustic features allows sharing the waveform generator model across multiple speakers without additional speaker codes. However, multi-speaker WaveNet models require large amounts of training data and computation to cover the entire acoustic space. This paper proposes leveraging the source-filter model of speech production to more effectively train a speaker-independent waveform generator with limited resources. We present a multi-speaker ’GlotNet’ vocoder, which utilizes a WaveNet to generate glottal excitation waveforms, which are then used to excite the corresponding vocal tract filter to produce speech. Listening tests show that the proposed model performs favourably to a direct WaveNet vocoder trained with the same model architecture and data.

 DOI: 10.21437/Interspeech.2018-1635

Cite as: Juvela, L., Tsiaras, V., Bollepalli, B., Airaksinen, M., Yamagishi, J., Alku, P. (2018) Speaker-independent Raw Waveform Model for Glottal Excitation. Proc. Interspeech 2018, 2012-2016, DOI: 10.21437/Interspeech.2018-1635.

  author={Lauri Juvela and Vassilis Tsiaras and Bajibabu Bollepalli and Manu Airaksinen and Junichi Yamagishi and Paavo Alku},
  title={Speaker-independent Raw Waveform Model for Glottal Excitation},
  booktitle={Proc. Interspeech 2018},