JP2019176508A - 高次アンビソニックス信号にダイナミックレンジ圧縮を適用するための方法および装置 - Google Patents
高次アンビソニックス信号にダイナミックレンジ圧縮を適用するための方法および装置 Download PDFInfo
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- H—ELECTRICITY
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- H04S3/00—Systems employing more than two channels, e.g. quadraphonic
- H04S3/008—Systems employing more than two channels, e.g. quadraphonic in which the audio signals are in digital form, i.e. employing more than two discrete digital channels
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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
- G10L19/008—Multichannel audio signal coding or decoding using interchannel correlation to reduce redundancy, e.g. joint-stereo, intensity-coding or matrixing
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- H—ELECTRICITY
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- H04S—STEREOPHONIC SYSTEMS
- H04S3/00—Systems employing more than two channels, e.g. quadraphonic
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04S—STEREOPHONIC SYSTEMS
- H04S3/00—Systems employing more than two channels, e.g. quadraphonic
- H04S3/02—Systems employing more than two channels, e.g. quadraphonic of the matrix type, i.e. in which input signals are combined algebraically, e.g. after having been phase shifted with respect to each other
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- 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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Abstract
Description
WL=DLB、B=DL -1WL
gはLL=(N+1)2個の利得DRC値のベクトルである。利得値は、τ個のサンプルのブロックに適用されると想定され、ブロックからブロックにかけてなめらかであると想定される。送信のために、同じ値を共有する利得値は利得群に組み合わされることができる。単一の利得群のみが使われる場合、これは、ここでg1によって示される単一のDRC利得値がすべてのスピーカー・チャネルのτ個のサンプルに適用されることを意味する。
(1)レンダリング行列DLは可逆でなければならない。すなわち、DL -1が存在する必要がある;
(2)空間領域での振幅の和が、空間領域からHOA領域への変換後に零次のHOA係数として反映されるべきであり、その後の空間領域への変換後に保存されるべきである(振幅要件);
(3)HOA領域に変換し、空間領域に変換し戻すとき、空間的信号のエネルギーが保存されるべきである(エネルギー保存要件)。
行ベクトルeが
DRCはレンダリング前にHOA信号に適用されるか、あるいはレンダリングと組み合わされてもよい。HOAについてのDRCは時間領域またはQMFフィルタバンク領域で適用できる。
さらに、前記変換行列は
さらに、前記変換行列は
Claims (3)
- ダイナミックレンジ圧縮(DRC)のための方法であって:
再構成された高次アンビソニックス(HOA)オーディオ信号表現を受領する段階と;
前記再構成されたHOAオーディオ信号を
Wは直交ミラー・フィルタ(QMF)バンクの入力時間粒度にマッチする空間的サンプルのブロックである、段階と;
時間周波数タイル(n,m)に対応するDRC利得値g(n,m)を
方法。 - ダイナミックレンジ圧縮(DRC)のための装置であって、当該装置は:
再構成された高次アンビソニックス(HOA)オーディオ信号表現を受領する受領器と;
オーディオ・デコーダとを有しており、前記オーディオ・デコーダは:
前記再構成されたHOAオーディオ信号を
時間周波数タイル(n,m)に対応するDRC利得値g(n,m)を
装置。 - コンピュータで実行されたときに該コンピュータに請求項1記載の方法を実行させるコンピュータ実行可能命令を有する非一時的なコンピュータ可読記憶媒体。
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EP14305423 | 2014-03-24 | ||
EP14305423.7 | 2014-03-24 | ||
EP14305559.8A EP2934025A1 (en) | 2014-04-15 | 2014-04-15 | Method and device for applying dynamic range compression to a higher order ambisonics signal |
EP14305559.8 | 2014-04-15 |
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JP2019176508A true JP2019176508A (ja) | 2019-10-10 |
JP6762405B2 JP6762405B2 (ja) | 2020-09-30 |
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JP2017219647A Active JP6545235B2 (ja) | 2014-03-24 | 2017-11-15 | 高次アンビソニックス信号にダイナミックレンジ圧縮を適用するための方法および装置 |
JP2019112767A Active JP6762405B2 (ja) | 2014-03-24 | 2019-06-18 | 高次アンビソニックス信号にダイナミックレンジ圧縮を適用するための方法および装置 |
JP2020150380A Active JP7101219B2 (ja) | 2014-03-24 | 2020-09-08 | 高次アンビソニックス信号にダイナミックレンジ圧縮を適用するための方法および装置 |
JP2022107586A Active JP7333855B2 (ja) | 2014-03-24 | 2022-07-04 | 高次アンビソニックス信号にダイナミックレンジ圧縮を適用するための方法および装置 |
JP2023132200A Pending JP2023144032A (ja) | 2014-03-24 | 2023-08-15 | 高次アンビソニックス信号にダイナミックレンジ圧縮を適用するための方法および装置 |
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US (7) | US9936321B2 (ja) |
EP (3) | EP3451706B1 (ja) |
JP (6) | JP6246948B2 (ja) |
KR (5) | KR102201027B1 (ja) |
CN (8) | CN109087653B (ja) |
AU (5) | AU2015238448B2 (ja) |
BR (5) | BR122020020730B1 (ja) |
CA (3) | CA2946916C (ja) |
HK (2) | HK1258770A1 (ja) |
RU (2) | RU2658888C2 (ja) |
TW (7) | TWI718979B (ja) |
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