EP2046076B1 - Multikanal-Audioverarbeitungssystem und -verfahren - Google Patents

Multikanal-Audioverarbeitungssystem und -verfahren Download PDF

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EP2046076B1
EP2046076B1 EP07291210A EP07291210A EP2046076B1 EP 2046076 B1 EP2046076 B1 EP 2046076B1 EP 07291210 A EP07291210 A EP 07291210A EP 07291210 A EP07291210 A EP 07291210A EP 2046076 B1 EP2046076 B1 EP 2046076B1
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channel
hand
signal
difference
producing
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EP2046076A1 (de
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Antoine-Victor Hurtado-Huyssen
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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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04S—STEREOPHONIC SYSTEMS 
    • H04S1/00—Two-channel systems

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  • the present invention relates to a multi-channel audio treatment system and method.
  • US patent N° 5,638,451 discloses a transmission and storage method for audio signals.
  • signals from additional audio channels of the multi-channel audio system are added to the left and right basic signals of the multi-channel audio system, such that two modified stereo signals are created for reproduction via a stereo system.
  • US 2004/0141619 discloses a method of generating a left modified and a right modified audio signal for a stereo system from multi-channel audio signals with a left and a right channel and at least one further audio channel.
  • the signal of the channel of higher energy is modified in a filter with a transformation function in a first parallel branch and is modified in a second filter with a reverberation function in a second parallel branch, the modified signals being joined together in a summation unit.
  • W02005/036925 discloses an apparatus for processing a multi-channel audio signal in a stereo compatible manner.
  • a first object of the present invention is a multi-channel audio treatment method ensuring compatibility of a multi-channel signal and a stereo signal, this method comprising
  • eStL(t) is the left-hand channel of the stereo signal
  • eStR(t) is the right-hand channel of the stereo signal
  • a second object of the present invention is a computer program product comprising a computer usable medium having control logic stored therein for causing a computer to ensure compatibility of a multi-channel signal and a stereo signal, said control logic comprising
  • a third object of the present invention is a multi-channel audio treatment device ensuring compatibility of a multi-channel signal and a stereo signal, comprising
  • adjustment variables being two adjustment variables M, S, having values between 0 and 1
  • eStL(t) is the left-hand channel of the stereo signal
  • eStR(t) is the right-hand channel of the stereo signal.
  • the process according to the invention acts in such a manner that the two formats produce the same audio results when reproduced on stereophonic and monophonic receivers.
  • the stereo downmix from the multi-channel signals must be equal to the original stereo format signal.
  • the process according to the invention determines the difference between the original stereo signal and the stereo downmix from the multi-channel signal, and this difference, obtained by subtraction, is then added into the multi-channel signal. The addition of this difference into the multi-channel signal ensures mathematically a downmix of the multi-channel signal that is identical to the stereo signal.
  • the process according to the invention is characterized by the method of adding the difference signal into the multi-channel signal, on two points in particular: on the one hand, the process separates the mono component and the stereo component of the difference signal in order to add them independently into the multi-channel signal channels; on the other hand, the process offers two adjustment variables to control this addition into the various channels of the multi-channel signal.
  • the input channels are:
  • the MS format conversion of the difference signal is:
  • the adjustment variables control the distribution of the mono and stereo components of the difference signal.
  • the value of these variables is between 0 and 1.
  • Adjustment variable 'M' distributes the monophonic component between the C(t) and L(t) / R(t) channels of the multi-channel signal.
  • Adjustment variable 'S' distributes the stereo component between the L(t) / R(t) and sL(t) / sR(t) channels of the multi-channel signal.

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

Claims (11)

  1. Multikanal-Audioverarbeitungsverfahren, das eine Kompatibilität eines Multikanalsignals und eines Stereosignals sicherstellt, umfassend
    - Produzieren eines linken Heruntermischkanals dwnMxL(t) und eines rechten Heruntermischkanals dwnMxR(t);
    - Produzieren eines linken Differenzkanals deltaL(t), wobei der linke Differenzkanal die Differenz zwischen dem linken Kanal des Stereosignals eStL(t) und des linken Heruntermischkanals dwnMxL(t) ist;
    - Produzieren eines rechten Differenzkanals deltaR(t), wobei der rechte Differenzkanal die Differenz zwischen dem rechten Kanal des Stereosignals eStR(t) und des rechten Heruntermischkanals dwnMxR(t) ist;
    - Addieren des rechten Differenzkanals deltaR(t) und des linken Differenzkanals deltaL(t) in das Multikanaleingangssignal.
  2. Multikanal-Audioverarbeitungsverfahren nach Anspruch 1, wobei das Addieren des rechten Differenzkanals deltaR(t) und des linken Differenzkanals deltaL(t) in das Multikanaleingangssignal folgendes umfaßt:
    - Produzieren einer Monokomponente des Differenzsignals deltaM t = 0 , 5 * deltaL t + deltaR t ;
    Figure imgb0079
    - Produzieren einer Stereokomponente des Differenzsignals deltaM t = 0 , 5 * deltaL t + deltaR t ;
    Figure imgb0080
    - Addieren der Monokomponente des Differenzsignals und der Stereokomponente des Differenzsignals zu dem Multikanalsignal, wobei Justierungsvariablen verwendet werden.
  3. Multikanal-Audioverarbeitungsverfahren nach Anspruch 1 oder 2, wobei der linke Heruntermischkanal dwnMxL(t) definiert ist als dwnMxL t = eL t + 1 2 ⁢ eC t + 1 2 ⁢ eLFE t + 1 2 ⁢ esL t ,
    Figure imgb0081
     der rechte Heruntermischkanal dwnMxR(t) definiert ist als dwnMxR t = eR t + 1 2 ⁢ eC t + 1 2 ⁢ eLFE t + 1 2 ⁢ esR t ,
    Figure imgb0082
    wobei eL(t) der linke Kanal des Multikanalsignals ist,
    eR(t) der rechte Kanal des Multikanalsignals ist,
    eC(t) der Mittelkanal des Multikanalsignals ist,
    eLFE(t) der Subbaßkanal des Multikanalsignals ist,
    esL(t) der linke hintere Kanal des Multikanalsignals ist,
    esR(t) der rechte hintere Kanal des Multikanalsignals ist.
  4. Multikanal-Audioverarbeitungsverfahren nach Anspruch 3, wobei Justierungsvariablen zwei Justierungsvariablen M, S mit Werten zwischen 0 und 1 sind, wobei das Multikanalausgangssignal rL t = e ⁢ L t + 1 - M * deltaM t + S * deltaS t
    Figure imgb0083
     rR t = eR t + 1 - M * deltaM t - S * deltaS t
    Figure imgb0084
     rC t = eC t + 2 * M * deltaM t
    Figure imgb0085
     rLFE t = eLFE t
    Figure imgb0086
     rsL t = esL t + 2 * 1 - S * deltaS t
    Figure imgb0087
     rsR t = esR t + 2 * S - 1 * deltaS t
    Figure imgb0088
     ist, wobei
    eStL(t) der linke Kanal des Stereosignals ist,
    eStR(t) der rechte Kanal des Stereosignals ist.
  5. Computerprogrammprodukt umfassend ein computerverwendbares Medium mit einer darin gespeicherten Steuerlogik, um einen Computer zu veranlassen, eine Kompatibilität eines Multikanalsignals und eines Stereosignals sicherzustellen, wobei die Steuerlogik folgendes umfaßt:
    - einen ersten computerlesbaren Programmcode zum Produzieren eines linken Heruntermischkanals dwnMxL(t) und eines rechten Heruntermischkanals dwnMxR(t);
    - einen zweiten computerlesbaren Programmcode zum Produzieren eines linken Differenzkanals deltaL(t), wobei der linke Differenzkanal die Differenz zwischen dem linken Kanal des Stereosignals eStL(t) und dem linken Heruntermischkanal dwnMxL(t) ist;
    - einen dritten computerlesbaren Programmcode zum Produzieren eines rechten Differenzkanals deltaR(t), wobei der rechte Differenzkanal die Differenz zwischen dem rechten Kanal des Stereosignals eStR(t) und dem rechten Heruntermischkanal dwnMxR(t) ist;
    - einen vierten computerlesbaren Programmcode zum Addieren des rechten Differenzkanals deltaR(t) und des linken Differenzkanals deltaL(t) in das Multikanaleingangssignal.
  6. Computerprogrammprodukt nach Anspruch 5, wobei die Steuerlogik einen fünften computerlesbaren Programmcode zum Produzieren einer Monokomponente des Differenzsignals deltaM t = 0 , 5 * deltaL t + deltaR t ;
    Figure imgb0089
     und einen sechsten computerlesbaren Programmcode zum Produzieren einer Stereokomponente des Differenzsignals deltaS t = 0 , 5 * deltaL t - deltaR t
    Figure imgb0090
     umfaßt,
    wobei der Computerprogrammcode einen siebten computerlesbaren Programmcode zum Addieren der Monokomponente des Differenzsignals und der Stereokomponente des Differenzsignals zu dem Multikanaleingangssignal umfaßt, wobei Justierungsvariablen verwendet werden.
  7. Computerprogrammprodukt nach Anspruch 6, wobei die Steuerlogik einen computerlesbaren Programmcode zum Produzieren des linken Heruntermischkanals dwnMxL(t) definiert als dwnMxL t = eL t + 1 2 ⁢ eC t + 1 2 ⁢ eLFE t + 1 2 ⁢ esL t
    Figure imgb0091
     und des rechten Heruntermischkanals dwnMxR(t) definiert als dwnMxR t = eR t + 1 2 ⁢ eC t + 1 2 ⁢ eLFE t + 1 2 ⁢ esR t
    Figure imgb0092
     umfaßt,
    wobei eL(t) der linke Kanal des Multikanalsignals ist,
    eR(t) der rechte Kanal des Multikanalsignals ist,
    eC(t) der Mittelkanal des Multikanalsignals ist,
    eLFE(t) der Subbaßkanal des Multikanalsignals ist,
    esL(t) der linke hintere Kanal des Multikanalsignals ist,
    esR(t) der rechte hintere Kanal des Multikanalsignals ist.
  8. Computerprogrammprodukt nach Anspruch 7, wobei Justierungsvariablen zwei Justierungsvariablen M, S mit Werten zwischen 0 und 1 sind, wobei die Steuerlogik einen computerlesbaren Programmcode zum Produzieren des folgenden Multikanalausgangssignals rL t = e ⁢ L t + 1 - M * deltaM t + S * deltaS t
    Figure imgb0093
     rR t = eR t + 1 - M * deltaM t - S * deltaS t
    Figure imgb0094
     rC t = eC t + 2 * M * deltaM t
    Figure imgb0095
     rLFE t = eLFE t
    Figure imgb0096
     rsL t = esL t + 2 * 1 - S * deltaS t
    Figure imgb0097
     rsR t = esR t + 2 * S - 1 * deltaS t
    Figure imgb0098
     umfaßt, wobei
    eStL(t) der linke Kanal des Stereosignals ist,
    eStR(t) der rechte Kanal des Stereosignals ist.
  9. Multikanal-Audioverarbeitungseinrichtung, die eine Kompatibilität eines Multikanalsignals und eines Stereosignals sicherstellt, umfassend
    - Mittel zum Produzieren eines linken Heruntermischkanals dwnMxL(t) und eines rechten Heruntermischkanals dwnMxR(t);
    - Mittel zum Produzieren eines linken Differenzkanals deltaL(t), wobei der linke Differenzkanal die Differenz zwischen dem linken Kanal des Stereosignals eStL(t) und des linken Heruntermischkanals dwnMxL(t) ist;
    - Mittel zum Produzieren eines rechten Differenzkanals deltaR(t), wobei der rechte Differenzkanal die Differenz zwischen dem rechten Kanal des Stereosignals eStR(t) und des rechten Heruntermischkanals dwnMxR(t) ist;
    - Mittel zum Addieren des rechten Differenzkanals deltaR(t) und des linken Differenzkanals deltaL(t) in das Multikanaleingangssignal.
  10. Multikanal-Audioverarbeitungseinrichtung nach Anspruch 9, umfassend Mittel zum Produzieren einer Monokomponente des Differenzsignals deltaM(t)=0,5*(deltaL(t)+deltaR(t)); Mittel zum Produzieren einer Stereokomponente des Differenzsignals deltaS(t)=0,5*(deltaL(t)-deltaR(t)) und Mittel zum Addieren der Monokomponente des Differenzsignals und der Stereokomponente des Differenzsignals zu dem Multikanalsignal, wobei Justierungsvariablen verwendet werden.
  11. Multikanal-Audioverarbeitungseinrichtung nach Anspruch 9 und 10, umfassend Mittel zum Produzieren eines linken Heruntermischkanals dwnMxL(t) definiert als dwnMxL t = eL t + 1 2 ⁢ eC t + 1 2 ⁢ eLFE t + 1 2 ⁢ esL t ,
    Figure imgb0099
     wobei die Einrichtung Mittel zum Produzieren des rechten Heruntermischkanals dwnMxR(t) definiert als dwnMxR t = eR t + 1 2 ⁢ eC t + 1 2 ⁢ eLFE t + 1 2 ⁢ esR t ,
    Figure imgb0100
    umfaßt, wobei eL(t) der linke Kanal des Multikanalsignals ist,
    eR(t) der rechte Kanal des Multikanalsignals ist,
    eC(t) der Mittelkanal des Multikanalsignals ist,
    eLFE(t) der Subbaßkanal des Multikanalsignals ist,
    esL(t) der linke hintere Kanal des Multikanalsignals ist,
    esR(t) der rechte hintere Kanal des Multikanalsignals ist,
    wobei Justierungsvariablen zwei Justierungsvariablen M, S mit Werten zwischen 0 und 1 sind,
    wobei die Einrichtung Mittel zum Produzieren des Ausgangsmultikanals rL t = e ⁢ L t + 1 - M * deltaM t + S * deltaS t
    Figure imgb0101
     rR t = eR t + 1 - M * deltaM t - S * deltaS t
    Figure imgb0102
     rC t = eC t + 2 * M * deltaM t
    Figure imgb0103
     rLFE t = eLFE t
    Figure imgb0104
     rsL t = esL t + 2 * 1 - S * deltaS t
    Figure imgb0105
     rsR t = esR t + 2 * S - 1 * deltaS t
    Figure imgb0106
     umfaßt, wobei
    eStL(t) der linke Kanal des Stereosignals ist,
    eStR(t) der rechte Kanal des Stereosignals ist.
EP07291210A 2007-10-04 2007-10-04 Multikanal-Audioverarbeitungssystem und -verfahren Not-in-force EP2046076B1 (de)

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AT07291210T ATE460054T1 (de) 2007-10-04 2007-10-04 Multikanal-audioverarbeitungssystem und - verfahren
EP07291210A EP2046076B1 (de) 2007-10-04 2007-10-04 Multikanal-Audioverarbeitungssystem und -verfahren

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US5594800A (en) * 1991-02-15 1997-01-14 Trifield Productions Limited Sound reproduction system having a matrix converter
EP0820664B1 (de) * 1996-02-08 2005-11-09 Koninklijke Philips Electronics N.V. Mit 2-kanal- und 1-kanal-übertragung kompatible n-kanalübertragung
US7394903B2 (en) * 2004-01-20 2008-07-01 Fraunhofer-Gesellschaft Zur Forderung Der Angewandten Forschung E.V. Apparatus and method for constructing a multi-channel output signal or for generating a downmix signal

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