Autoregressive models for statistical parametric speech synthesis
IEEE (Institute of Electrical and Electronics Engineers)
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Shannon, M., Zen, H., & Byrne, W. (2013). Autoregressive models for statistical parametric speech synthesis.
Copyright 2013 IEEE.
We propose using the autoregressive hidden Markov model (HMM) for speech synthesis. The autoregressive HMM uses the same model for parameter estimation and synthesis in a consistent way, in contrast to the standard approach to statistical parametric speech synthesis. It supports easy and efficient parameter estimation using expectation maximization, in contrast to the trajectory HMM. At the same time its similarities to the standard approach allow use of established high quality synthesis algorithms such as speech parameter generation considering global variance. The autoregressive HMM also supports a speech parameter generation algorithm not available for the standard approach or the trajectory HMM and which has particular advantages in the domain of real-time, low latency synthesis. We show how to do efficient parameter estimation and synthesis with the autoregressive HMM and look at some of the similarities and differences between the standard approach, the trajectory HMM and the autoregressive HMM. We compare the three approaches in subjective and objective evaluations. We also systematically investigate which choices of parameters such as autoregressive order and number of states are optimal for the autoregressive HMM.
acoustic modeling, autoregressive hidden Markov model, autoregressive processes, hidden Markov models (HMMs), speech, statistical parametric speech synthesis
This work was supported in part by the European Community’s Seventh Framework Programme (FP7/2007-2013) under grant agreement 213845 (EMIME) and in part by EPSRC Programme Grant EP/I031022/1 (Natural Speech Technology).