Word and Monosyllable Recognition Using Lifters on Two-Dimensional Cepstrum.

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Bibliographic Details
Title:	Word and Monosyllable Recognition Using Lifters on Two-Dimensional Cepstrum.
Authors:	Ariki, Yasuo¹, Nagata, Masaaki², Sakai, Toshlyuki¹
Source:	Systems & Computers in Japan. May89, Vol. 20 Issue 5, p23-33. 11p.
Subjects:	Word recognition, Monosyllables, Filters (Mathematics), Vocabulary, Lexicology, Reading (Elementary)
Abstract:	This paper examines experimentally the dynamical features which are useful in the recognition of words and monosyllables. By the two-dimensional cepstrum analysis of the speech waveform, the two-dimensional dynamical features are obtained for the time and frequency variations. First, the usefulness of the dynamic features for the time variation in the recognition is examined. It is shown as the result that the spectral envelope and its global variation are important in the recognition. It is shown especially that the recognition rate for the monosyllable is improved by providing a highs emphasis lifter for the dynamic feature, and the noise immunity is improved by providing a low-pass filter. The reason is that the high-emphasis lifter on the two-dimensional cepstrum emphasizes the formant in a two-dimensional way on the time-frequency plane, while the low-pass lifter corresponds to the two-dimensional smoothing on the time-frequency plane. Finally, the lifting on the two-dimensional cepstrum is compared experimentally with the usual one-dimensional cepstrum. Hence, it is seen that the two-dimensional cepstrum is better from the viewpoints of the monosyllable recognition and the recognition performance in a noisy environment. [ABSTRACT FROM AUTHOR]
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Database:	Engineering Source

Description
Abstract:	This paper examines experimentally the dynamical features which are useful in the recognition of words and monosyllables. By the two-dimensional cepstrum analysis of the speech waveform, the two-dimensional dynamical features are obtained for the time and frequency variations. First, the usefulness of the dynamic features for the time variation in the recognition is examined. It is shown as the result that the spectral envelope and its global variation are important in the recognition. It is shown especially that the recognition rate for the monosyllable is improved by providing a highs emphasis lifter for the dynamic feature, and the noise immunity is improved by providing a low-pass filter. The reason is that the high-emphasis lifter on the two-dimensional cepstrum emphasizes the formant in a two-dimensional way on the time-frequency plane, while the low-pass lifter corresponds to the two-dimensional smoothing on the time-frequency plane. Finally, the lifting on the two-dimensional cepstrum is compared experimentally with the usual one-dimensional cepstrum. Hence, it is seen that the two-dimensional cepstrum is better from the viewpoints of the monosyllable recognition and the recognition performance in a noisy environment. [ABSTRACT FROM AUTHOR]
ISSN:	08821666
DOI:	10.1002/scj.4690200503