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Training augmentation with TANDEM acoustic modelling in Punjabi adult speech recognition system

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Abstract

Processing of low resource pre and post acoustic signals always faced the challenge of data scarcity in its training module. It’s difficult to obtain high system accuracy with limited corpora in train set which results into extraction of large discriminative feature vector. These vectors information are distorted due to acoustic mismatch occurs because of real environment and inter speaker variations. In this paper, context independent information of an input speech signal is pre-processed using bottleneck features and later in modeling phase Tandem-NN model has been employ to enhance system accuracy. Later to fulfill the requirement of train data issues, in-domain training augmentation is perform using fusion of original clean and artificially created modified train noisy data and to further boost this training data, tempo modification of input speech signal is perform with maintenance of its spectral envelope and pitch in corresponding input audio signal. Experimental result shows that a relative improvement of 13.53% is achieved in clean and 32.43% in noisy conditions with Tandem-NN system in comparison to that of baseline system respectively.

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Authors and Affiliations

  1. Department of Informatics, School of Computer Science, University of Petroleum & Energy Studies (UPES), Bidholi, Dehradun, 248007, India

    Virender Kadyan

  2. Centre of Excellence for Speech and Multimodal Laboratory, Chitkara University Institute of Engineering and Technology, Chitkara University, Punjab, India

    Shashi Bala & Puneet Bawa

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  1. Virender Kadyan
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Kadyan, V., Bala, S. & Bawa, P. Training augmentation with TANDEM acoustic modelling in Punjabi adult speech recognition system. Int J Speech Technol 24, 473–481 (2021). https://doi.org/10.1007/s10772-021-09797-0

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