VOICE RECOGNITION SUPPORT SYSTEM

To improve S/N ratio by removing a stationary noise in addition to a time-varying noise and increase a voice recognition rate of a target voice signal even when the level of the input target voice signal is low.SOLUTION: An input AGC processing unit 3, a subtractive beamforming processing unit 4, a...

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Bibliographische Detailangaben
Hauptverfasser:	HIRANO NOBUMITSU, FUJIWARA SO, SATO MASAYUKI, KATO YOSHINORI
Format:	Patent
Sprache:	eng ; jpn
Schlagworte:	ACOUSTICS MUSICAL INSTRUMENTS PHYSICS SPEECH ANALYSIS OR SYNTHESIS SPEECH OR AUDIO CODING OR DECODING SPEECH OR VOICE PROCESSING SPEECH RECOGNITION
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Beschreibung
Zusammenfassung:	To improve S/N ratio by removing a stationary noise in addition to a time-varying noise and increase a voice recognition rate of a target voice signal even when the level of the input target voice signal is low.SOLUTION: An input AGC processing unit 3, a subtractive beamforming processing unit 4, a time-varying noise spectrum estimation processing unit 6, a stationary noise spectrum estimation processing unit 7, a target voice signal extraction processing unit 9, a target voice section detection processing unit 10 and an output AGC processing unit 13 are included. The stationary noise spectrum estimation processing unit 7 operates in a noise section detected by the target voice section detection processing unit 10.SELECTED DRAWING: Figure 1 【課題】時変雑音に加えて定常雑音を除去してＳ／Ｎ比を改善する。入力する目的音声信号のレベルが小さくても目的音声信号の音声認識率を高くする。【解決手段】入力ＡＧＣ処理部３と、減算型ビームフォーミング処理部４と、時変雑音スペクトル推定処理部６と、定常雑音スペクトル推定処理部７と、目的音声信号抽出処理部９と、目的音声区間検出処理部１０と、出力ＡＧＣ処理部１３を備える。定常雑音スペクトル推定処理部７は目的音声区間検出処理部１０で検出された雑音区間で動作する。【選択図】図１