Nippon Telegraph and Telephone Corporation

Takafumi Hikichi

Masato Miyoshi

Takuya Yoshioka

Masayuki Sugizaki

Tetsuo Amakasu

Kaname Kasahara

It is intended to acquire a highly accurate speech recognition result for a subject of a conversation, while inhibiting an increase in the amount of calculation. A speech recognition device () according to the present invention includes a first speech recognition unit () that performs speech recognition processing using a first method on speech data of a conversation made by a plurality of speakers and outputs a speech recognition result for each of respective uttered speech segments of the plurality of speakers, a determination unit () that determines a subject segment based on a result of the speech recognition processing by the first speech recognition unit, and a second speech recognition unit () that performs speech recognition processing using a second method higher in accuracy than the first method on the speech data in the segment determined to be the subject segment and outputs a speech recognition result as a subject text.

Speech recognition device, search device, speech recognition method, search method, and program

Provided is a signal distortion elimination apparatus comprising: an inverse filter application means that outputs the signal obtained by applying an inverse filter to an observed signal as a restored signal when a predetermined iteration termination condition is met and outputs the signal obtained by applying the inverse filter to the observed signal as an ad-hoc signal when the predetermined iteration termination condition is not met; a prediction error filter calculation means that segments the ad-hoc signal into frames and outputs a prediction error filter of each frame obtained by performing linear prediction analysis of the ad-hoc signal of each frame; an inverse filter calculation means that calculates an inverse filter such that a concatenation of innovation estimates of the respective frames becomes mutually independent among their samples, where the innovation estimate of a single frame (an innovation estimate) is the signal obtained by applying the prediction error filter of the corresponding frame to the ad-hoc signal of the corresponding frame, and outputs the inverse filter; and a control means that iteratively executes the inverse filter application means, the prediction error filter calculation means and the inverse filter calculation means until the iteration termination condition is met.

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Kyoto, Japan

Takafumi Hikichi