JP2006058899A - 発話検索のためのラティス・ベースの検索システムおよび方法 - Google Patents
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Abstract
【解決手段】この音声文書は、呼または電話会議などの中程度の単語誤り率を有する文書であることが好ましい。この方法は、音声文書に関連する音声をラティス表現に変換する工程と、音声のラティス表現に索引を付ける工程とを含む。これらの工程は通常オフラインで実行される。この方法は、ユーザから照会を受け取ると音声の索引付けされたラティス表現を検索する工程と、ユーザ照会に一致する音声文書から検索した音節を返送する工程とをさらに含む。
【選択図】図1
Description
Huang、Aceroおよび Hon、「Spoken Language Processing」、Prentice Hall PTR、2001、664〜673頁
この結果、ASRの1最良ケースに関して、放送ニュースでは3倍、交換台では5倍、電話会議では9倍の索引サイズの増加が見られた。
Claims (26)
- 音声文書を検索する方法であって、
音声文書に関連する音声をラティス表現に変換する工程と、
前記音声のラティス表現に索引を付ける工程と、
ユーザから照会を受け取ると、
前記音声の索引付けされたラティス表現を検索する工程と、
前記ユーザ照会に一致する前記音声文書の音節を返送する工程とを含む方法。 - 前記音声変換工程と前記ラティス表現に索引を付ける工程とがオフラインで実行される請求項1に記載の方法。
- 前記音声変換工程が前記ラティス表現内にタイミング情報を提供する工程をさらに含む請求項1に記載の方法。
- 前記音声変換工程が自動音声認識によって実行される請求項1に記載の方法。
- 前記自動音声認識がHMMベースである請求項4に記載の方法。
- 前記自動音声認識が大量ボキャブラリ連続音声認識である請求項5に記載の方法。
- 前記自動音声認識で使用される音響モデルが判定ツリー状態クラスタ化音素である請求項5に記載の方法。
- 自動音声認識で使用される言語モデルが枝刈りバックオフ・トリグラム・モデルである請求項7に記載の方法。
- ボキャブラリ外単語を含むベースライン発音辞書にない発音が、テキスト−音声モジュールを介して生成される請求項1に記載の方法。
- 前記ラティス表現に索引を付ける工程が、
各アーク・ラベルに1つ、ラティス番号に1つ、各ラティス内のラベルが付いた各アークの入力状態に1つ、その状態に至る確率質量に1つ、アーク自体の確率に1つの索引を含む索引のセットを記憶する工程と、
前記ラティス内の次の状態の索引を記憶する工程とをさらに含む請求項1に記載の方法。 - 音声の前記索引付けされたラティス表現を検索する工程と、前記ユーザ照会に一致する前記音声文書の音節を返送する工程とが、
ラベル索引から各ラティス内のすべてのアークを検索することで前記音声文書を表すラティスのセットから単一のラベルを検索するステップと、
確率分析を介してどのラベルがユーザ照会に一致するかを判定する工程と、
前記一致したラベルに関連する音節を返送する工程とをさらに含む請求項10に記載の方法。 - 前記ラティスのセットから単一のラベルを検索する前に、前記ラティスのセットが重み付けによって正規化され、その結果、アークから最終状態に至るすべてのパスのセットの確率が1になる請求項10に記載の方法。
- 一定のしきい値未満の確率の場合に音節を返送しない請求項10に記載の方法。
- 前記方法が、認識単位が単音であるASRシステムを用いた単音認識であって前記ASRシステムが単音レベル言語モデルを使用する単音認識によって、前記音声文書に関連する音声発話の音声表現を得る工程をさらに含む請求項1に記載の方法。
- 前記方法が、発話の単語レベル表現をベースラインASRシステムを用いて単音表現に変換し、出力内の各単語を単音についてのその発音に置き換えることで前記音声文書に関連する音声発話の音声表現を得る工程をさらに含む請求項1に記載の方法。
- 前記方法が、ボキャブラリ外単語検出で使用するハイブリッド言語モデルを使用することで前記音声文書に関連する音声発話の音声表現を得る工程をさらに含む請求項1に記載の方法。
- 前記ハイブリッド言語モデルが単音レベル言語モデルと単語レベル言語モデルの組み合わせである請求項16に記載の方法。
- 前記音声文書が単音に基いて索引付けされ、前記方法が、照会単語の発音を用いて各照会単語を単音文字列に変換する工程と、
各単音文字列の音声のラティス表現の単音ベースの索引を検索する工程とをさらに含む請求項1に記載の方法。 - 最小発音長さの上限が使用される請求項18に記載の方法。
- 音声文書に関する単語索引と副単語索引とが終了する音声文書を検索する方法であって、前記方法が、ユーザ照会を受信すると、
前記ユーザ照会に基いて単語索引を検索する工程と、
前記ユーザ照会に基いて副単語索引を検索する工程と、
前記結果を組み合わせて前記ユーザ照会に一致する音節を前記文書から検索する工程とを含む方法。 - 前記音節を検索する工程が、前記単語索引および副単語索引から得たラティス・カウントから得た組み合わせスコアを用いて音節を検索する工程をさらに含む請求項20に記載の方法。
- 組み合わせスコアを計算する際に、前記副単語索引ラティス・カウントが前記ユーザ照会の発音長さを用いて正規化される請求項21に記載の方法。
- 音声文書に関する単語索引と副単語索引とが終了する音声文書を検索する方法であって、前記方法が、ユーザ照会を受信すると、
前記ユーザ照会がボキャブラリ内の場合に、前記ユーザ照会に基いて単語索引を検索する工程と、
前記ユーザ照会がボキャブラリ外の場合に、前記ユーザ照会に基いて副単語索引を検索する工程とを含む方法。 - 音声文書に関する単語索引と副単語索引とが終了する音声文書を検索する方法であって、前記方法が、ユーザ照会を受信すると、
前記ユーザ照会に基いて単語索引を検索する工程と、結果が返送されない場合、前記ユーザ照会に基いて副単語索引を検索する工程とを含む方法。 - 音声文書を検索するシステムであって、
音声文書に関連する音声をラティス表現に変換する手段と、
前記音声のラティス表現に索引を付ける手段と、
ユーザから照会を受け取ると、
前記音声の索引付けされたラティス表現を検索する手段と、
前記ユーザ照会に一致する前記音声文書の音節を返送する手段とを含むシステム。 - 音声文書を検索するコンピュータ・デバイスを制御する命令を記憶するコンピュータ可読媒体であって、前記命令が、
音声文書に関連する音声をラティス表現に変換する工程と、
前記音声のラティス表現に索引を付ける工程と、
ユーザから照会を受け取ると、
前記音声の索引付けされたラティス表現を検索する工程と、
前記ユーザ照会に一致する前記音声文書の音節を返送する工程とを含むコンピュータ可読媒体。
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JP2010522923A (ja) * | 2007-04-13 | 2010-07-08 | マサチューセッツ インスティテュート オブ テクノロジー | 音声データ検索装置、音声データ検索方法、音声データ検索プログラム、及びコンピュータが読取可能な音声データ検索プログラムを内蔵したコンピュータが使用可能な媒体 |
US8386264B2 (en) | 2007-04-13 | 2013-02-26 | Nippon Telegraph And Telephone Corporation | Speech data retrieval apparatus, speech data retrieval method, speech data retrieval program and computer usable medium having computer readable speech data retrieval program embodied therein |
JP2010277036A (ja) * | 2009-06-01 | 2010-12-09 | Mitsubishi Electric Corp | 音声データ検索装置 |
JP2017167265A (ja) * | 2016-03-15 | 2017-09-21 | カシオ計算機株式会社 | 検索インデクス生成装置、検索インデックス生成方法、音声検索装置、音声検索方法及びプログラム |
JP2017167248A (ja) * | 2016-03-15 | 2017-09-21 | カシオ計算機株式会社 | 検索インデクス生成装置、検索インデックス生成方法、音声検索装置、音声検索方法及びプログラム |
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US20160179947A1 (en) | 2016-06-23 |
US9286890B2 (en) | 2016-03-15 |
CN1741132A (zh) | 2006-03-01 |
CA2515613A1 (en) | 2006-02-23 |
US8670977B2 (en) | 2014-03-11 |
US20140188474A1 (en) | 2014-07-03 |
EP1630705A2 (en) | 2006-03-01 |
KR20060050578A (ko) | 2006-05-19 |
US7912699B1 (en) | 2011-03-22 |
US9965552B2 (en) | 2018-05-08 |
EP1630705A3 (en) | 2006-10-04 |
US20110173226A1 (en) | 2011-07-14 |
US20180253490A1 (en) | 2018-09-06 |
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