Duration Modeling by Multi-Models based on Vowel Production characteristics V Ramu Reddy author Parakrant Sarkar author K Sreenivasa Rao author 2014-12 text Proceedings of the 11th International Conference on Natural Language Processing Dipti Misra Sharma editor Rajeev Sangal editor Jyoti D Pawar editor NLP Association of India Goa, India conference publication reddy-etal-2014-duration https://aclanthology.org/W14-5106/ 2014-12 39 47