JP6151866B2 - オーディオ信号のフィルタ生成方法およびそのためのパラメータ化装置 - Google Patents
オーディオ信号のフィルタ生成方法およびそのためのパラメータ化装置 Download PDFInfo
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- H—ELECTRICITY
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- H04S—STEREOPHONIC SYSTEMS
- H04S7/00—Indicating arrangements; Control arrangements, e.g. balance control
- H04S7/30—Control circuits for electronic adaptation of the sound field
- H04S7/307—Frequency adjustment, e.g. tone control
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
- G10L19/00—Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis
- G10L19/008—Multichannel audio signal coding or decoding using interchannel correlation to reduce redundancy, e.g. joint-stereo, intensity-coding or matrixing
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- H04S—STEREOPHONIC SYSTEMS
- H04S1/00—Two-channel systems
- H04S1/002—Non-adaptive circuits, e.g. manually adjustable or static, for enhancing the sound image or the spatial distribution
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- H—ELECTRICITY
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- G10L19/00—Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis
- G10L19/02—Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis using spectral analysis, e.g. transform vocoders or subband vocoders
- G10L19/0204—Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis using spectral analysis, e.g. transform vocoders or subband vocoders using subband decomposition
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- H04S2400/01—Multi-channel, i.e. more than two input channels, sound reproduction with two speakers wherein the multi-channel information is substantially preserved
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- H—ELECTRICITY
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- H04S2400/00—Details of stereophonic systems covered by H04S but not provided for in its groups
- H04S2400/03—Aspects of down-mixing multi-channel audio to configurations with lower numbers of playback channels, e.g. 7.1 -> 5.1
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- H—ELECTRICITY
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- H04S—STEREOPHONIC SYSTEMS
- H04S2420/00—Techniques used stereophonic systems covered by H04S but not provided for in its groups
- H04S2420/01—Enhancing the perception of the sound image or of the spatial distribution using head related transfer functions [HRTF's] or equivalents thereof, e.g. interaural time difference [ITD] or interaural level difference [ILD]
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04S—STEREOPHONIC SYSTEMS
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Description
Claims (10)
- 入力オーディオ信号のバイノーラルフィルタリングのための少なくとも1つのBRIR(Binaural Room Impulse Response)フィルタ係数を受信するステップ;
前記BRIRフィルタ係数を複数のサブバンドフィルタ係数に変換するステップ;
前記サブバンドフィルタ係数から抽出された残響時間情報を用いて該サブバンドの平均残響時間情報を得るステップ;
前記得られた平均残響時間情報のカーブフィッティング(curve fitting)のための少なくとも1つの係数を得るステップ;
時間ドメイン上における前記BRIRフィルタ係数の長さが既に設定された値を超過するか否かを示すフラグ情報を得るステップ;
前記サブバンドフィルタ係数の切断長さを決定するためのフィルタ次数情報を得るステップ、前記フィルタ次数情報は前記得られたフラグ情報に応じて前記平均残響時間情報または前記少なくとも1つの係数を用いて得られ、少なくとも1つのサブバンドの前記フィルタ次数情報は他サブバンドのフィルタ次数情報とは異なる;および
前記得られたフィルタ次数情報を用いて前記サブバンドフィルタ係数を切断するステップ;
を含むことを特徴とするオーディオ信号のフィルタ生成方法。 - 前記フラグ情報が前記BRIRフィルタ係数の長さが既に設定された値を超過することを示す場合、前記フィルタ次数情報は前記得られた少なくとも1つの係数を用いてカーブフィッティングされた値に基づいて決定されることを特徴とする、請求項1に記載のオーディオ信号のフィルタ生成方法。
- 前記カーブフィッティングされたフィルタ次数情報は、前記少なくとも1つの係数を用いて多項式カーブフィッティングされた値の整数単位の近似値を指数とする2の累乗値に決定されることを特徴とする、請求項2に記載のオーディオ信号のフィルタ生成方法。
- 前記フラグ情報が前記BRIRフィルタ係数の長さが既に設定された値を超過しないことを示す場合、前記フィルタ次数情報は前記カーブフィッティングの実行なしで該サブバンドの前記平均残響時間情報に基づいて決定されることを特徴とする、請求項1に記載のオーディオ信号のフィルタ生成方法。
- 前記フィルタ次数情報は、前記平均残響時間情報のログスケールの整数単位の近似値を指数とする2の累乗値に決定されることを特徴とする、請求項4に記載のオーディオ信号のフィルタ生成方法。
- 前記フィルタ次数情報は、前記平均残響時間情報に基づいて決定された該サブバンドの基準切断長さと前記サブバンドフィルタ係数の原本長さのうちの小さい値に決定されることを特徴とする、請求項1に記載のオーディオ信号のフィルタ生成方法。
- 前記基準切断長さは2の累乗値であることを特徴とする、請求項6に記載のオーディオ信号のフィルタ生成方法。
- 前記フィルタ次数情報は各サブバンド別に1つの値を有することを特徴とする、請求項1に記載のオーディオ信号のフィルタ生成方法。
- 前記平均残響時間情報は、同一サブバンドの少なくとも1つのサブバンドフィルタ係数から抽出されたチャネル別の残響時間情報の平均値であることを特徴とする、請求項1に記載のオーディオ信号のフィルタ生成方法。
- オーディオ信号のフィルタを生成するためのパラメータ化装置であって、
前記パラメータ化装置は、
入力オーディオ信号のバイノーラルフィルタリングのための少なくとも1つのBRIR(Binaural Room Impulse Response)フィルタ係数を受信し;
前記BRIRフィルタ係数を複数のサブバンドフィルタ係数に変換し;
前記サブバンドフィルタ係数から抽出された残響時間情報を用いて該サブバンドの平均残響時間情報を取得し;
前記得られた平均残響時間情報のカーブフィッティング(curve fitting)のための少なくとも1つの係数を取得し;
時間ドメイン上における前記BRIRフィルタ係数の長さが既に設定された値を超過するか否かを示すフラグ情報を取得し;
前記サブバンドフィルタ係数の切断長さを決定するためのフィルタ次数情報を得るが、前記フィルタ次数情報は前記得られたフラグ情報に応じて前記平均残響時間情報または前記少なくとも1つの係数を用いて得られ、少なくとも1つのサブバンドの前記フィルタ次数情報は他サブバンドのフィルタ次数情報とは異なり;
前記得られたフィルタ次数情報を用いて前記サブバンドフィルタ係数を切断する;
パラメータ化装置。
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KR20130161114 | 2013-12-23 | ||
KR10-2013-0161114 | 2013-12-23 | ||
PCT/KR2014/012758 WO2015099424A1 (ko) | 2013-12-23 | 2014-12-23 | 오디오 신호의 필터 생성 방법 및 이를 위한 파라메터화 장치 |
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EP (4) | EP4246513A3 (ja) |
JP (1) | JP6151866B2 (ja) |
KR (7) | KR102215124B1 (ja) |
CN (3) | CN106416302B (ja) |
BR (1) | BR112016014892B1 (ja) |
CA (1) | CA2934856C (ja) |
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