Pegasusnet Co., Ltd.

T. S. Photon Co., Ltd.

Toppan Printing Co., Ltd.

Hitoshi Masuda

Mitsuteru Inoue

Teruya Sugiyama

Yusuke Tsukahara

Mikio Yamaguchi

Masao Tanabe

Dong-Hak Shin

Shin Dong-Hak

An optic switch for cross-connecting input light signals incoming from inlet fiber cables to outlet fiber cables is disclosed that makes use of a holographic filter () having a series of preformed different speckle patterns, each in the form of a hologram (H, H, . . . ). Associated with input light signals guided past respective inlet passages (in) of a multimode waveguide (), different speckle patterns are formed by applying different control voltages across respective electrode pairs () provided thereon. These speckle patterns past a single outlet passage (out) of the multimode waveguide () into which the inlet passages (in) converge are joined together and enter the holographic filter () in which an input light signal is selectively switched, addressed and cross-connected to an outlet waveguide () through a region thereof where a formed speckle pattern coincides with a preformed speckle pattern. The multi mode waveguides () is formed in, e.g., a LiNbOphotorefractive substrate ().

Optical cross-connect device

An optic switch for cross-connecting input light signals incoming from inlet fiber cables to outlet fiber cables is disclosed that makes use of a holographic filter () having a series of preformed different speckle patterns, each in the form of a hologram (H, H, . . . ). Associated with input light signals guided past respective inlet passages (in) of a multimode waveguide (), different speckle patterns are formed by applying different control voltages across respective electrode pairs () provided thereon. These speckle patterns past a single outlet passage (out) of the multimode waveguide () into which the inlet passages (in) converge are joined together and enter the holographic filter () in which an input light signal is selectively switched, addressed and cross-connected to an outlet waveguide () through a region thereof where a formed speckle pattern coincides with a preformed speckle pattern. The multi mode waveguides () is formed in, e. g., a LiNbOphotorefractive substrate ().

A speech analysis apparatus according to the invention, comprising a transforming section for receiving a spectrum envelope, for transforming the spectrum envelope such magnitude data thereof becomes suitable, and for generating a transformed spectrum envelope, an integrator for receiving the transformed spectrum envelope output from the transforming section, for integrating the input spectrum envelope with respect to a predetermined variable, and for outputting an integrated spectrum envelope, and a projection circuit for receiving the transformed spectrum envelope from the transform circuit and the integrated spectrum envelope from the integrator, and for projecting the spectrum envelope with respect to the integrated data. Therefore, the analysis result inherent to the phoneme can be obtained regardless of vocal tract lengths. The spectrum envelope to be projected can be integrated by the integrator, along the frequency axis or the mel axis. The analysis apparatus further includes a spectrum envelope-extractor for obtaining the spectrum envelope, by using cepstrum analysis and smoothing the resultant spectrum envelope. A spectrum envelope in the transition from a consonant to a vowel can be obtained.

Method of analyzing input speech and speech analysis apparatus therefor

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Yamato, Japan

Hitoshi Masuda