JP2007013400A - 集音装置 - Google Patents
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Abstract
【解決手段】音声信号処理部2は、ディジタルフィルタ21A〜21Mから出力される時間遅延処理信号を用いて、各部分領域に対応する集音ビームXc1〜Xc4を形成する。音声信号処理部2は、これら集音ビームXc1〜Xc4から最も信号強度の強い集音ビームを選択して、音源が存在する部分領域を検出する。音声信号処理部3はこの部分領域をさらに分割する局所領域に対して同様に集音ビームXc5〜Xc8を形成して、さらに詳細な音源方向を検出する。音声信号処理部2は、この結果に基づき、音源方向に対応する集音ビームの合成音声信号を出力する。
【選択図】 図1
Description
以下の説明では、音源検知領域全体を4つの部分領域、および各部分領域をさらに分割する4つの局所領域で音源100の検知を行うための構成について説明するが、領域の分割数は装置仕様や所望とする音源検知方向の分解能に基づいて、適宜設定すればよい。また、マイクロホンアレイ1は、マイクロホン10A〜10Mを直線状に配列したものを用いて説明する。
また、図2、図3は本実施形態の音声信号処理部2の構成を示すブロック図であり、図2が集音ビームの形成、選択を行う部分を示し、図3は目的とする局所領域に対する集音ビームの選択、出力を行う部分を示す。なお、図2では、ディジタルフィルタ21A〜21Mの内のディジタルフィルタ21Aについてのみ詳細なブロック図を図示し、詳細な説明を行うが、他のディジタルフィルタ21B〜21Mについても同様の構造である。
図8(A)に示すマイクロホンアレイ1は、各マイクロホン10が所定間隔で1つ(1次元)の円周上に配置されたものである。図8(B)に示すマイクロホンアレイ1は、各マイクロホン10が複数(複数次元)の円周上に配置されたものである。
このようにマイクロホン10が配列されたマイクロホンアレイ1に対しても、前述の構成および処理を適用することができ、音源方向の検知と、この検知音源方向からの集音を実現することができる。
Claims (5)
- 複数のマイクロホンを所定パターンに配列して構成されるマイクロホンアレイと、
前記複数のマイクロホンが集音した音声信号をそれぞれ所定の遅延時間で遅延して合成することにより、特定方向に強い指向性の集音ビームを形成するビーム形成部であって、並列にそれぞれ独立した遅延時間を設定することで同時に複数方向に集音ビームを形成するビーム形成部と、
該ビーム形成部が形成した複数の集音ビームのうち、信号レベルが最も高い集音ビームが集音する音声信号、または、該信号レベルが最も高い集音ビームと該信号レベルが最も高い集音ビームに隣接する集音ビームとが集音する音声信号を選択して後段に出力する信号選択部と、
を備えた集音装置。 - 複数のマイクロホンを所定パターンに配列して構成されるマイクロホンアレイと、
前記複数のマイクロホンが集音した音声信号をそれぞれ所定の遅延時間で遅延して合成することにより、特定方向に強い指向性の集音ビームを形成するビーム形成部であって、並列にそれぞれ独立した遅延時間を設定することで同時に複数方向に集音ビームを形成するビーム形成部と、
複数エリアのそれぞれに向けて集音ビームを形成するように前記ビーム形成部を制御し、信号レベルが最も高い集音ビームに対応するエリアを複数の小エリアに再分割し、該小エリアのそれぞれに向けて集音ビームを形成するように前記ビーム形成部を制御し、これら小エリアに対応する複数の集音ビームのうち、信号レベルが最も高い集音ビームが集音する音声信号、または、該信号レベルが最も高い集音ビームと該信号レベルが最も高い集音ビームに隣接する集音ビームとが集音する音声信号を選択して後段に出力する信号選択部と、
を備えた集音装置。 - 前記ビーム形成部は、所定タイミング毎に集音ビームを形成し、
前記信号選択部は、前記所定タイミング毎に集音する音声信号の選択を行う請求項1または請求項2に記載の集音装置。 - 前記信号選択部は、前後するタイミングで異なる集音ビームを用いて、集音する音声信号を選択する場合に、前のタイミングで集音された音声信号による合成音声信号と、後のタイミングで集音された音声信号による合成音声信号とをクロスフェード処理して出力する請求項3に記載の集音装置。
- 前記信号選択部は、各音声信号の所定周波数成分のみからなる集音ビームを用いて集音する音声信号を選択する請求項1〜4のいずれかに記載の集音装置。
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