EP2952016A1 - Procédé de traitement du son multicanal dans un système à son multicanal - Google Patents

Procédé de traitement du son multicanal dans un système à son multicanal

Info

Publication number
EP2952016A1
EP2952016A1 EP13705936.6A EP13705936A EP2952016A1 EP 2952016 A1 EP2952016 A1 EP 2952016A1 EP 13705936 A EP13705936 A EP 13705936A EP 2952016 A1 EP2952016 A1 EP 2952016A1
Authority
EP
European Patent Office
Prior art keywords
signals
signal
surround
stereo
difference
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP13705936.6A
Other languages
German (de)
English (en)
Other versions
EP2952016B1 (fr
Inventor
Gunnar Kron
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kronoton GmbH
Original Assignee
Kronoton GmbH
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Filing date
Publication date
Application filed by Kronoton GmbH filed Critical Kronoton GmbH
Publication of EP2952016A1 publication Critical patent/EP2952016A1/fr
Application granted granted Critical
Publication of EP2952016B1 publication Critical patent/EP2952016B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04S—STEREOPHONIC SYSTEMS 
    • H04S5/00—Pseudo-stereo systems, e.g. in which additional channel signals are derived from monophonic signals by means of phase shifting, time delay or reverberation 
    • H04S5/02—Pseudo-stereo systems, e.g. in which additional channel signals are derived from monophonic signals by means of phase shifting, time delay or reverberation  of the pseudo four-channel type, e.g. in which rear channel signals are derived from two-channel stereo signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04S—STEREOPHONIC SYSTEMS 
    • H04S2400/00—Details of stereophonic systems covered by H04S but not provided for in its groups
    • H04S2400/13—Aspects of volume control, not necessarily automatic, in stereophonic sound systems

Definitions

  • the invention relates to a method for multi-channel sound processing in a multi-channel sound system in which the input signals L and R, preferably as stereo signals, are decoded.
  • the coefficients ai... A 8 of these weighted summations are derived from level measurements.
  • two control signals from the level difference of a left and right channel D LR and level difference of a sum and difference signal D cs are calculated. These two control signals are changed with time-variant response times in this dynamic.
  • Four individual weighting factors E c , E s , E L and E R are then derived from these two time variant new control signals, which enable a time-variant output matrix for calculating the front signals L 'and R' as well as the center signal C and the surround signal S. ,
  • the two front signals L out and R out are obtained from the two input signals L and R and the subtraction of a weighted sum signal (L + R) and a weighted difference signal (LR).
  • the center signal C results from the sum (L + R) and the subtraction of the weighted input signals L and R.
  • the surround signal S is made up of the sum (LR) and the subtraction of the weighted input signals L and R.
  • the weighting coefficients gi , g r , g c and g s are obtained from a level matching of the signals L and R and L + R and LR in a recursive structure. Also, US Pat. No. 6,697,491 Bl uses the level difference calculation for L / R and (L + R) / (LR) for deriving control signals for the weighted matrix coding in the multi-channel tone processing.
  • the front signals L 0 and R 0 , the center signal C 0 and the surround signals L R0 and R R0 are derived from stereo signals, ie from the input signals L and R.
  • the respective other signals are subtracted from the signals L, R, L + R and LR with a weighting.
  • frequency-dependent weighting factors are derived in addition to the level ratio calculations.
  • the center signal C is varied only in the level, whereas the two surround signals L R0 and R R0 are derived in two frequency bands and phase-inverted.
  • the signals L and R are decoded into a space signal R and into a center signal.
  • the space signal is formed from the difference between the signals L and R (R L ) and / or the difference between the signals R and L (R R ).
  • a space is created by the method according to the invention - And stereo extension of a stereo signal achieved by an expansion of the stereo decomposition.
  • S R 2R-L proved to be favorable.
  • the advantage here is a frequency-dependent weighting of the surround signals.
  • a frequency-dependent weighting of the signals S L and S R takes place .
  • the frequency-dependent weighting is preferably carried out by means of a height-helving filter.
  • the signals L and R are expediently added to the signals L P and R P.
  • an audio system for carrying out the method is the subject matter of claim 13, wherein the audio system comprises a signal processor, preferably in the form of an audio processor.
  • a software is provided which is located on a signal processor, ie. is imported to the signal processor.
  • the software contains an algorithm which is processed by the signal processor, the algorithm detecting the method.
  • the invention covers a signal processor for carrying out the method.
  • Fig. 1 a method according to the invention.
  • Fig. 1 shows the method according to the invention, which has four method sections A, B, C, D.
  • the procedural sections are:
  • the method begins with the fact that, as part of the decoding, the input signals L and R, which are present as stereo signals, are split into three sine parts, whereby the signals L and R can be retained.
  • the signal components are the center signal C, the room signal R and the surround signals S L and S R.
  • the center signal C is single-channel, ie. it contains only the channel C, whereas the space signal R and the surround signal S are two-channel, ie they contain the signals R L and R R and S L and S R, respectively.
  • the surround and space signals S L , S R and R L and R R contain the direction and spatial information of the stereo signals L and R.
  • the signals i. H .
  • the process section A is followed by the process section B, in which the processing of the channels C, R L , RR, S L and S R takes place.
  • these signals are provided by first level control 1, 2 with a level weighting, which manifests itself in the factor 1.5.
  • the further level controls 3, 4 provide a further variable level weighting, which weights the sound characteristics of the decoded signals to L, R.
  • the filters 5, 6 have a minimal phase shift in the frequency range of preferably 2 kHz, so that extinction effects are minimized in the taking place in process section C encoding, at the same time the actual gain effect is emphasized with a height helving frequency response by, for example, 3 d B at preferably 2KHZ.
  • the surround signals S L , S R are supplied to the level selectors 7, 8 which weight the sound characteristics of the decoded signals to S
  • R P V c C + V R R r + V s
  • S R V c (L + R) + V R ( R L) + V s (2R-L) or after filtering the surround signals S L , S R
  • R P V c C + V R RR + V s (S R ) Fi
  • ered t V c (L + R) + VR (R 'L) + V s (2R-L) Fi
  • the encoded weighted signals L P , R P undergo post-processing by stereo equalizers 9, 10.
  • a special non-linear characteristic NL is used. This non-linear characteristic maps an input amplitude x to an output amplitude y.
  • the signals L P , R P undergo further post-processing in the method section D such that the level adjusters 11, 12 determine the degree of overtone mixing to the direct signal. Further processing is finally carried out by the level control 13, 14, which make the overall level of the process result adjustable.
  • the present invention is not limited in its execution to the standing specified embodiment. Rather, a number of variants is conceivable, which make use of the solution shown in other types. For example, within the scope of the method section D Maximizer, i. Compressors / Limiter find application to further enrich the sound.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Algebra (AREA)
  • General Physics & Mathematics (AREA)
  • Mathematical Analysis (AREA)
  • Mathematical Optimization (AREA)
  • Mathematical Physics (AREA)
  • Pure & Applied Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Stereophonic System (AREA)

Abstract

L'invention concerne un procédé de traitement du son multicanal dans un système à son multicanal, procédé selon lequel les signaux d'entrée L et R, de préférence sous forme de signaux stéréo, sont décodés. L'invention vise à perfectionner ce procédé pour permettre d'améliorer davantage la restitution spatiale des signaux d'entrée L et R sur la base d'une extraction de composantes directionnelles. A cet effet, les signaux R et L sont décodés au moins en deux signaux sous la forme nL-mR où n, m = 1, 2, 3, 4.
EP13705936.6A 2013-02-04 2013-02-04 Procédé de traitement du son multicanal dans un système à son multicanal Active EP2952016B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2013/052127 WO2014117867A1 (fr) 2013-02-04 2013-02-04 Procédé de traitement du son multicanal dans un système à son multicanal

Publications (2)

Publication Number Publication Date
EP2952016A1 true EP2952016A1 (fr) 2015-12-09
EP2952016B1 EP2952016B1 (fr) 2018-09-26

Family

ID=47749772

Family Applications (1)

Application Number Title Priority Date Filing Date
EP13705936.6A Active EP2952016B1 (fr) 2013-02-04 2013-02-04 Procédé de traitement du son multicanal dans un système à son multicanal

Country Status (7)

Country Link
US (1) US9628932B2 (fr)
EP (1) EP2952016B1 (fr)
JP (1) JP6438892B2 (fr)
KR (1) KR102089821B1 (fr)
CN (1) CN104969575B (fr)
SG (1) SG11201506075UA (fr)
WO (1) WO2014117867A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9380383B2 (en) 2013-09-06 2016-06-28 Gracenote, Inc. Modifying playback of content using pre-processed profile information
CN110719563B (zh) * 2018-07-13 2021-04-13 海信视像科技股份有限公司 调整立体声声像的方法、获取立体声声像的电路

Family Cites Families (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5248001B2 (fr) * 1973-08-20 1977-12-07
US5046098A (en) 1985-03-07 1991-09-03 Dolby Laboratories Licensing Corporation Variable matrix decoder with three output channels
JPS62146000A (ja) * 1985-12-20 1987-06-30 Sony Corp 音場拡大信号発生回路
JPH05316600A (ja) * 1992-05-12 1993-11-26 Nec Corp サラウンド回路
US5771295A (en) 1995-12-26 1998-06-23 Rocktron Corporation 5-2-5 matrix system
US6697491B1 (en) 1996-07-19 2004-02-24 Harman International Industries, Incorporated 5-2-5 matrix encoder and decoder system
US5970153A (en) 1997-05-16 1999-10-19 Harman Motive, Inc. Stereo spatial enhancement system
JP4627880B2 (ja) 1997-09-16 2011-02-09 ドルビー ラボラトリーズ ライセンシング コーポレイション リスナーの周囲にある音源の空間的ひろがり感を増強するためのステレオヘッドホンデバイス内でのフィルタ効果の利用
US7035413B1 (en) * 2000-04-06 2006-04-25 James K. Waller, Jr. Dynamic spectral matrix surround system
JP4624643B2 (ja) 2000-08-31 2011-02-02 ドルビー・ラボラトリーズ・ライセンシング・コーポレーション オーディオ・マトリックス・デコーディング装置に関する方法
JP2003333699A (ja) * 2002-05-10 2003-11-21 Pioneer Electronic Corp マトリックス・サラウンドデコード装置
JP4580210B2 (ja) * 2004-10-19 2010-11-10 ソニー株式会社 音声信号処理装置および音声信号処理方法
JP2007311965A (ja) * 2006-05-17 2007-11-29 Pioneer Electronic Corp デジタルオーディオ信号処理装置
DE102008036924B4 (de) 2008-08-08 2011-04-21 Gunnar Kron Verfahren zur Mehrkanalbearbeitung in einem Mehrkanaltonsystem
US8867749B2 (en) * 2011-04-18 2014-10-21 Paul Blair McGowan Acoustic spatial projector

Also Published As

Publication number Publication date
US9628932B2 (en) 2017-04-18
WO2014117867A1 (fr) 2014-08-07
KR102089821B1 (ko) 2020-03-17
SG11201506075UA (en) 2015-09-29
CN104969575A (zh) 2015-10-07
CN104969575B (zh) 2018-03-23
JP6438892B2 (ja) 2018-12-19
JP2016509427A (ja) 2016-03-24
KR20150114508A (ko) 2015-10-12
EP2952016B1 (fr) 2018-09-26
US20150382125A1 (en) 2015-12-31

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