Publications

Hiroshige, M, Miyanaga, Y & Tochinai, K 1990, 'An Adaptive Signal Processing System for Voiced Speech with Automatic Spectrum Selector', Systems and Computers in Japan, vol. 21, no. 4, pp. 85-96.
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AbstractIn this paper, adaptive spectrum analysis algorithms for voiced speech are discussed. A new adaptive signal processing system which uses a modified MIS algorithm and has a spectrum selector using a neural network is proposed. Based on the properties of voiced speech, we first test an identification algorithm which estimates AR parameters from the first moment of the observed signal and investigate its sensitivity to noise. In order to compare the modified MIS for voiced speech analysis with the above first moment analysis, the frequency domain properties of weighting factor A which is used in the modified MIS are presented.This paper shows that we should select only the accurate spectra from among the results given by the modified MIS. The selection of spectra is automatically performed using a neural network. Using above methods, we construct a new analysis system for voiced speech. Experiments on real speech show that the proposed system is effective for speech analysis.

Miyanaga, Y, Ohtsuki, N & Tochinai, K 1990, 'Adaptive ARMA lattice modeling for speech processing', Journal of the Acoustical Society of Japan (E), vol. 11, no. 3, pp. 173-182.
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Miyanaga, Y, Tochinai, K, Nagai, N & Nagata, K 1990, 'Adaptive identification of a modified ARMA lattice model', IEEE Transactions on Circuits and Systems, vol. 37, no. 9, pp. 1140-1144.
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Veitch, D & Glendinning, P 1990, 'Explicit renormalisation in piecewise linear bimodal maps', Physica D: Nonlinear Phenomena, vol. 44, no. 1-2, pp. 149-167.
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Watterson, PA 1990, 'Magnetic field penetration into thin discs', Archiv für Elektrotechnik, vol. 73, no. 5, pp. 353-363.
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Boyce, RR, Bone, DJ, Houwing, AFP & Finlayson, KD 1970, 'Measurement of heavy particle and electron densities in supersonic nonequilibrium corner expansions of ionized argon and neon', AIP Conference Proceedings, American Institute of Physics, pp. 414-419.

Huang, X & Chen, H 1970, 'Born migration and its fast implementation in the wavenumber‐time domain', SEG Technical Program Expanded Abstracts 1990, SEG Technical Program Expanded Abstracts 1990, Society of Exploration Geophysicists, pp. 1136-1139.
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© 1990 Society of Exploration Geophysicists. All rights reserved. A new method for wave equation migration is presented in this paper. This migration method, named Born Migration, is formulated by solving the boundary-value problem of the wave equation in an integral closed-form and applying the Born approximation for the Green's function in the inhomogeneous media. The major features of Born migration are: 1. it has no limitation in dip angle; 2. it can accommodate gentle vertical and lateral velocity variations; and 3. it can be implemented by using fast Fourier transformation. It is believed that this technique is especially suitable for migration in 3D seismic survey application.