On-line Bayesian Tree-structured Transformation of Hidden Markov Models for Speaker Adaptation

On-line hierarchical transformation of hidden Markov models for speaker adaptation

This paper presents a novel framework of on-line hierarchical transformation of hidden Markov models (HMM’s) for speaker adaptation. Our aim is to incrementally transform (or adapt) all the HMM parameters to a new speaker even though part of HMM units are unseen in adaptation data. The transformation paradigm is formulated according to the approximate Bayesian estimate, which the prior statisti...

Online Bayesian tree-structured transformation of HMMs with optimal model selection for speaker adaptation

This paper presents a new recursive Bayesian learning approach for transformation parameter estimation in speaker adaptation. Our goal is to incrementally transform or adapt a set of hidden Markov model (HMM) parameters for a new speaker and gain large performance improvement from a small amount of adaptation data. By constructing a clustering tree of HMM Gaussian mixture components, the linear...

Online hierarchical transformation of hidden Markov models for speech recognition

This paper proposes a novel framework of online hierarchical transformation of hidden Markov model (HMM) parameters for adaptive speech recognition. Our goal is to incrementally transform (or adapt) all the HMM parameters to a new acoustical environment even though most of HMM units are unseen in observed adaptation data. We establish a hierarchical tree of HMM units and apply the tree to dynam...

Improved Bayesian learning of hidden Markov models for speaker adaptation

We propose an improved maximum a posteriori (MAP) learning algorithm of continuous-density hidden Markov model (CDHMM) parameters for speaker adaptation. The algorithm is developed by sequentially combining three adaptation approaches. First, the clusters of speaker-independent HMM parameters are locally transformed through a group of transformation functions. Then, the transformed HMM paramete...

Speaker Independent Speech Recognition Using Hidden Markov Models for Persian Isolated Words