Automatic Complexity Control of Generalized Variable Parameter HMMs for Noise Robust Speech Recognition
Automatic Complexity Control of Generalized Variable Parameter HMMs for Noise Robust Speech Recognition
复制标题
用于噪声鲁棒语音识别的广义变参数 HMM 的自动复杂度控制
DOI:
10.1109/taslp.2014.2372901
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发表时间:
2015
影响因子:
5.4
通讯作者:
Lan Wang
中科院分区:
文献类型:
--
作者:
Rongfeng Su;Xunying Liu;Lan Wang
An important part of the acoustic modelling problem for automatic speech recognition (ASR) systems is to handle the mismatch against a target environment created by time-varying external factors such as ambient noise. One possible solution to this problem is to introduce controllability to the underlying acoustic model to allow an instantaneous adaptation to the underlying noise condition. Along this line, the continuous trajectory of optimal, well matched model parameters against the varying noise can be explicitly modelled using, for example, generalized variable parameter HMMs (GVP-HMM). In order to improve the generalization and computational efficiency of conventional GVP-HMMs, this paper investigates a novel model complexity control method for GVP-HMMs. The optimal polynomial degrees of Gaussian mean, variance and model space linear transform trajectories are automatically determined at local level. Significant error rate reductions of 20% and 28% relative were obtained over the multi-style training baseline systems on Aurora 2 and a medium vocabulary Mandarin Chinese speech recognition task respectively. Consistent performance improvements and model size compression of 60% relative were also obtained over the baseline GVP-HMM systems using a uniformly assigned polynomial degree.
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