SOUND COLLECTION DEVICE, SOUND COLLECTION METHOD, AND SOUND COLLECTION PROGRAM

To provide a sound collection device capable of improving a quality of a sound signal by suppressing the generation of a noise even if it is a consonant component at a speech termination.SOLUTION: A subtractor 10 generates a residual signal as a difference between a sound signal and a conversion sou...

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Hauptverfasser: YAMABE TAKAO, TAKANASHI RIKU
Format: Patent
Sprache:eng ; jpn
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Zusammenfassung:To provide a sound collection device capable of improving a quality of a sound signal by suppressing the generation of a noise even if it is a consonant component at a speech termination.SOLUTION: A subtractor 10 generates a residual signal as a difference between a sound signal and a conversion sound signal. A coefficient update part 61 supplies a coefficient to a FIR filter 60, and updates the coefficient so that the residual signal becomes small. A filter coefficient analysis part 7 analyzes a coefficient value at a speech termination supplied to the FIR filter 60 by the coefficient update part 61 at the speech termination to terminate a speech in consonant, and determines whether or not the coefficient value of a coefficient at the termination is the coefficient value corresponded to the consonant. A filter coefficient correction part 8 corrects the coefficient value of the coefficient at the termination to a target coefficient value stored in a target coefficient value storage part 9 when the filter coefficient analysis part 7 determines that the coefficient value at the termination of the coefficient is the coefficient value corresponded to the consonant, and the target coefficient value is supplied to the coefficient update part 61.SELECTED DRAWING: Figure 1 【課題】発話終了時が子音成分であっても雑音の発生を抑制して音声信号の品質を向上させることができる収音装置を提供する。【解決手段】減算器10は、音声信号と変換音声信号との差分である残差信号を生成する。係数更新部61は、FIRフィルタ60に係数を供給し、残差信号が小さくなるように係数を更新する。フィルタ係数分析部7は、発話終了時に係数更新部61がFIRフィルタ60に供給した発話終了時の係数値を分析することにより、発話が子音で終了し、終了時係数の係数値が子音に対応する係数値であるか否かを判定する。フィルタ係数補正部8は、フィルタ係数分析部7が、終了時係数の係数値が子音に対応する係数値であると判定したとき、発話終了時の係数値を目標係数値格納部9に格納されている目標係数値に補正して、目標係数値を係数更新部61に供給する。【選択図】図1