INFERENCE PROGRAM, INFERENCE DEVICE, AND INFERENCE METHOD OF HIDDEN MARKOV MODEL

Title:

INFERENCE PROGRAM, INFERENCE DEVICE, AND INFERENCE METHOD OF HIDDEN MARKOV MODEL

Document Type and Number:

WIPO Patent Application WO/2012/008184

Kind Code:

A1

Abstract:

Disclosed is a hidden Markov model inference algorithm that can calculate unknown parameters even outside specialized conditions. An inference means (14) is provided with: an update/setting means (24) that, as the unknown parameters of a hidden Markov model, updates/sets the probabilities that are a state transition probability (a), an output probability (b), an initial state probability (π) and a likelihood (P (y|θ)), and the expected value (Na) of state transition and the expected value (Nb) of output; and a computation means (26) that calculates new probabilities and expected values using infinitesimal approximation by means of Taylor expansion, using not only the probabilities and expected values immediately before updating/setting by means of the update/setting means (24), but also the previous time-shifted probabilities and expected values, and using observation data read from a register (1) and a speed-up parameter value (β) set by an initial setting means (22).

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Inventors:

MATSUYAMA, Yasuo (104 Totsukamachi 1-chome Shinjuku-k, Tokyo 50, 〒1698050, JP)
松山　泰男 (〒50 東京都新宿区戸塚町１丁目１０４番地　学校法人早稲田大学内 Tokyo, 〒1698050, JP)

Application Number:

JP2011/058312

Publication Date:

January 19, 2012

Filing Date:

March 31, 2011

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Assignee:

WASEDA UNIVERSITY (104 Totsukamachi 1-chome, Shinjuku-ku Tokyo, 50, 〒1698050, JP)
学校法人早稲田大学 (〒50 東京都新宿区戸塚町１丁目１０４番地 Tokyo, 〒1698050, JP)
MATSUYAMA, Yasuo (104 Totsukamachi 1-chome Shinjuku-k, Tokyo 50, 〒1698050, JP)

International Classes:

G10L15/06; G10L15/14

Attorney, Agent or Firm:

USHIKI, Mamoru (3rd Fl, Yusei Fukushi Kotohira Bldg.14-1, Toranomon 1-chome, Minato-k, Tokyo 01, 〒1050001, JP)

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