EP0808076B1 - Système acoustique à effet spatial - Google Patents

Système acoustique à effet spatial Download PDF

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Publication number
EP0808076B1
EP0808076B1 EP96107860A EP96107860A EP0808076B1 EP 0808076 B1 EP0808076 B1 EP 0808076B1 EP 96107860 A EP96107860 A EP 96107860A EP 96107860 A EP96107860 A EP 96107860A EP 0808076 B1 EP0808076 B1 EP 0808076B1
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EP
European Patent Office
Prior art keywords
signal
signals
surround sound
modified
surround
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.)
Expired - Lifetime
Application number
EP96107860A
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German (de)
English (en)
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EP0808076A1 (fr
Inventor
Martin Dipl.-Phys. Winterer
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TDK Micronas GmbH
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TDK Micronas GmbH
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Priority to EP96107860A priority Critical patent/EP0808076B1/fr
Priority to DE59611450T priority patent/DE59611450D1/de
Priority to US08/854,922 priority patent/US6122381A/en
Priority to KR1019970018860A priority patent/KR100437174B1/ko
Priority to JP9129033A priority patent/JPH1094099A/ja
Publication of EP0808076A1 publication Critical patent/EP0808076A1/fr
Application granted granted Critical
Publication of EP0808076B1 publication Critical patent/EP0808076B1/fr
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    • 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 
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04S—STEREOPHONIC SYSTEMS 
    • H04S3/00—Systems employing more than two channels, e.g. quadraphonic
    • 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
    • H04S2400/01—Multi-channel, i.e. more than two input channels, sound reproduction with two speakers wherein the multi-channel information is substantially preserved

Definitions

  • the invention relates to a surround sound system with a source for spatial signals containing at least one right and one left signal and further, the right and left signals to a surround sound image complementary signals.
  • a source for spatial signals containing at least one right and one left signal and further, the right and left signals to a surround sound image complementary signals.
  • Several methods are known for generating a surround sound, in particular, use four different channels with associated speakers or boxes to create a spatial impression.
  • a very well-known method is currently used under the brand name "Dolby Pro Logic" in many audio systems, including in conjunction with comfortable television receivers.
  • Dolby Pro Logic an acoustic sense of space is formed by the fact that there is usually a right, a left, a middle and finally a rear channel.
  • the rearward channel may also be referred to as an environmental channel.
  • This channel distribution gives a good sense of space, especially for acoustic signals, which are mainly positioned on the center area in front of the listener.
  • the spatial signals are not formed from real room signals, but via filter circuits only from the existing legal and links information. In this case, it is a pseudoraumeindruck, but still increases the hearing comfort.
  • the middle loudspeaker which represents a sound source in front of the listener sound source, often saved by evenly dividing the center signal within the associated surround sound filter circuit on the right and left channel evenly.
  • This mode is usually referred to as "phantom mode”.
  • the operation without a medium playback source is the application in the television sector contrary, because the television even in the upper version usually have only two built-in speakers for the right and left channel and for structural reasons, a separate box for the center channel is hardly feasible.
  • the distribution of the center channel in the television receiver in "phantom mode" is favored by the relatively narrow playback sources and the sound event itself, which is usually displayed on the screen, such as a newsreader, a dialogue scene or a music group - this corresponds to the acoustic center position ,
  • the generally good sound impression in central sound events is offset by the less good sound impression in the case of television reception in the case of more space-related, in particular decentralized, sound events.
  • Responsible for this is the far too small distance - the stereo base - of the two built-in speakers for the right and left channel.
  • the available stereo base width and the viewing distance usually do not match the television receiver.
  • EP 0 776 144 (State of the art under Article 54 (3) EPC) circuits are known with which electronically the stereo base can be increased.
  • the right and left signal is modified by means of suitable filter circuits before speaker playback, the differences in the signal waveforms from about 300 Hz highlighted in the right and left channels and the common signal components are attenuated.
  • the common signal components essentially represent a center signal.
  • the disadvantage of the described surround sound systems is that they falsify more or less the center impression through their filter circuits in phantom mode - ie in the electronic simulation of playback devices in the center position. If this still the stereo base width is increased, then the center impression is even more affected.
  • the advantage of the invention is that the source for spatial signals, for example the already mentioned multichannel decoder "Dolby Surround Pro Logic", does not work in phantom mode with respect to its output signals, but remains in normal mode. Thus, it outputs all spatial signals separately and as unchanged as possible, for example, the right and left signal, as well as the center signal and the surrounding signal.
  • the right and left signals are fed to an external stereo broadening circuit, then the center channel is multiplied by a certain factor and added to the modified right and left signals. Due to the separate processing, the center channel is not modified as before in the stereo base broadening circuit with respect to its frequency-dependent signal components. Thus, the center impression remains independent of the selected stereo base broadening.
  • the schematic block diagram of the known spatial sound circuit of FIG. 1 contains as source 1 for spatial signals, for example, a known Multi-channel decoder (eg the already mentioned processor "Dolby Surround Pro Logic”), which supplies as output signals a right signal R, a left signal L, a center signal C and an environment signal S.
  • a known Multi-channel decoder eg the already mentioned processor "Dolby Surround Pro Logic”
  • Dolby Surround Pro Logic eg the already mentioned processor "Dolby Surround Pro Logic”
  • the formation of the surround sound signals from a supplied from a Tonfrequenzfrequenztreatment 2 stereo multiplex signal SM takes place in a surround sound filter circuit 1.1.
  • the processing is there digital, so that the individual signals are converted by means of digital / analog converter 1.2 again into analog signal components.
  • a control device 3, via control signals 3.1, 3.2 controls the source 1 and the preceding stage 2.
  • control depends on whether the total circuit is part of a television receiver or other device.
  • about the controller 3 can also pretend how much sound reproduction devices, namely speakers or speakers are available, or whether the playback should be done via a headphone.
  • the internal surround filter circuit 1.1 is switched, whereby the output signals are changed and adapted to the actual number of playback devices.
  • Particularly naturalized is the operating mode of the already mentioned phantom mode, in which the center signal C is divided equally to the right and left signal R and L. On the ambient signal S, this has no effect.
  • Too narrow a stereo base is compensated by a modifying circuit 4 which is input in the phantom playback mode with an "R + C" signal and a “L + C” signal.
  • the weighting of the center signal component C is optionally frequency-dependent in the surround sound filter circuit 1.1.
  • the output of the modification circuit 4 provides a modified right signal R1, and a modified left signal L1, which feeds the right and left speakers RL and LL, respectively.
  • the ambient signal S is reproduced by means of a separate loudspeaker SL, which is best placed behind the listener.
  • FIG. 2 a first embodiment of the invention is shown schematically. If functional units are included in FIG. 2, which are already described in FIG. 1, they are provided with the same reference numerals, so that a further discussion unnecessary.
  • the source 1 for the spatial signals R, L, C, S can also deliver them as digital signals, then new digital / analog interfaces are to be determined in the respective signal paths, which then have their own digital / analog converters 1.2 or use the source 1 via separate inputs.
  • the peculiarity of Fig. 2 is that with a reduced number of Tonwiedergabe wornen the source 1 no longer has to be switched to the "phantom mode", but the signal reduction takes place only after the Basisverbreiterung 4.
  • the center signal C is weighted by means of a multiplier 5 and added via a first adder 6.1 to the modified right signal R1 and via a second adder 6.2 demofiziert left signal L1.
  • the new output signals R2 and L2 feed the right and left speaker device RL and LL, respectively.
  • the weighting of the center signal C determines a multiplication factor m from the control device 3.
  • Fig. 3 shows a further embodiment of the invention, in which the number of playback sources is reduced to a single pair of loudspeakers RL, LL.
  • This embodiment is particularly suitable for television receivers with a built-in right and left display box.
  • the stereo base width is relative is small and eliminates a speaker for the surrounding signal, results according to the invention, a satisfactory acoustic room impression.
  • the circuit of FIG. 3 differs from the circuit of FIG. 2 in that the ambient signal S is fed to a filter circuit 7 which forms a pseudostereosignal pair SR, SL from the ambient signal S, whose right or left component is additive to the signal R2, L2 are added for the right and left speakers RL, LL by means of third and fourth adders 6.3, 6.4, respectively.
  • the order or summary 6.5, 6.6 of the adder in each signal path to form a right signal R3 and left signal L3 is arbitrary.
  • the filter circuit 7 for forming a pseudostereosignal pair SR, SL from a single space signal component S can be very simple, cf. Fig. 7.
  • the circuit shown is known and is from the publication of the " Audio Engineering Society "," Stereophonic Techniques - An anthology of reprinted articles on stereophonic techniques ", New York, 1986, pages 64-69 out. It is a reprint of an essay JAES, Volume 6, No. 2, pages 74 to 79, April 1958 "An Artificial Stereophonic Effect Obtained from a Single Audio Signal" by MR Schroeder , The same technical article also describes the improved circuits of FIGS. 8 and 9.
  • the directional effect for the left or right signal L1, R1 is enhanced by coupling the higher frequency components, which are important for the spatial impression, to the other channel in antiphase position.
  • the coupling takes place via a first or second combination stage K1, K2, whereby the respective signal portion filtered with a high-pass filter HP is respectively weighted by a multiplier M with the factor k.
  • the opposite phase is simplified in that the two combiners K1, K2 are each formed by a subtractor whose subtrahend input is fed with the high-pass filtered signal from the opposite channel.
  • the stereo base broadening circuit includes an adder ad whose output L + R is the sum signal of the right and left signals L, R.
  • the sum value represents the signal component, which actually contains no direction information.
  • a signal component is determined therefrom and subtracted from the right R and left signal L.
  • the two modified spatial components R1, L1 thus each contain a lower common signal component L + R, which causes the two signal sources to diverge, as it were, without the actual position of the loudspeakers being changed.
  • a difference signal L - R is formed from the right and left signals R, L by means of a subtracter sb.
  • a high-pass filtered component of this difference signal L-R is used in order to increase in phase the independent left or independent right signal component in the respective signal path.
  • the in-phase admixing is performed by an adder K1 or a subtractor K2. Also in Fig. 6 thus takes place an enlargement of the independent signal components in the two signal paths, whereby the stereo base width seems to be increased for the listener.
  • FIG. 7 shows a known circuit which generates from the monaural signal f (t) of a signal source 8 a pseudostereosignal pair which is reproduced via a right and left loudspeaker RL, LL.
  • the output signal f (t - ⁇ ) + f (t) then feeds the right speaker RL.
  • the output signal f (t- ⁇ ) of the delay device 9 is combined via a subtracter K4 with the original signal f (t) and forms a signal f (t- ⁇ ) -f (t) which feeds the left-hand loudspeaker LL.
  • the direction-dependent auditory impression is due to the fact that the modified by the delay device 9 signals in conjunction with the different sound propagation times to the right and left ear of the listener pretend the desired directional impression.
  • FIG. 8 shows another known example of how a monaural signal f (t) can be used to form a pseudostereosignal pair via a filter bank BP.
  • the original signal f (t) is thereby resolved via a multiplicity of narrowband bandpass filters 10 into a series of separate frequency ranges.
  • the outputs of the successive bandpasses numbered 1 to 16 in FIG. 1 are alternately connected to the right and left loudspeakers RL, LL. This will again achieve a directional effect.
  • the formation of the pseudo-stereo signals from the original signal f (t) is further refined in FIG. 9 by connecting downstream of the individual bandpass filters 10 of the filter bank BP phase inverter 11.
  • This arrangement allows each bandpass output to be connected to one of the two loudspeakers RL, LL.
  • the outputs are alternately guided via the respective phase inverter 11, which is assigned to the respective bandpass filter 10.
  • no frequency gaps occur in the pseudo-stereo signal, as in the arrangements of FIGS. 7 and 8, as a result of which the sound image is less distorted.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Stereophonic System (AREA)
  • Reverberation, Karaoke And Other Acoustics (AREA)
  • Circuit For Audible Band Transducer (AREA)

Claims (4)

  1. Système acoustique à effet spatial comportant une source (1) pour des signaux à effet spatial (R, L, C, S) qui contiennent un signal droit et un signal gauche (L, R) et d'autres signaux qui complètent le signal droit et le signal gauche (L, R) pour obtenir une sensation d'effet spatial, dans lequel on prévoit un circuit de modification (4) qui est destiné à l'élargissement de la base stéréo et auquel on envoie seulement le signal droit et le signal gauche purs (L, R) de la source (1) et dans lequel les signaux qui complètent la sensation d'effet spatial contiennent un signal central (C) qui est envoyé de manière additive aux signaux de sortie du circuit de modification (4) qui constituent un signal droit et un signal gauche modifiés (L1, R1).
  2. Système acoustique à effet spatial selon la revendication 1, dans lequel les signaux qui complètent la sensation d'effet spatial comprennent un signal d'ambiance (S) qui est reproduit au moyen d'un haut-parleur (SL) qui est placé dans la zone spatiale arrière de l'auditeur.
  3. Système acoustique à effet spatial selon la revendication 1 ou 2, dans lequel le signal central (C) est ajouté avec un facteur de multiplication déterminé (m) au signal droit et au signal gauche modifiés (L1, R1).
  4. Système acoustique à effet spatial selon l'une quelconque des revendications 1 à 3, dans lequel on forme, à partir du signal d'ambiance (S), au moyen d'un circuit de filtrage (7), une paire de signaux de pseudo-stéréophonie (SR, SL) dont les composantes droite et gauche (SR, SL) sont combinés avec les signaux droite et gauche modifiés (R1, L1 ; R2, L2) pour la reproduction au moyen de la paire de haut-parleurs (RL, LL).
EP96107860A 1996-05-17 1996-05-17 Système acoustique à effet spatial Expired - Lifetime EP0808076B1 (fr)

Priority Applications (5)

Application Number Priority Date Filing Date Title
EP96107860A EP0808076B1 (fr) 1996-05-17 1996-05-17 Système acoustique à effet spatial
DE59611450T DE59611450D1 (de) 1996-05-17 1996-05-17 Raumklangsystem
US08/854,922 US6122381A (en) 1996-05-17 1997-05-13 Stereophonic sound system
KR1019970018860A KR100437174B1 (ko) 1996-05-17 1997-05-16 스테레오음향시스템
JP9129033A JPH1094099A (ja) 1996-05-17 1997-05-19 ステレオ音響システム

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP96107860A EP0808076B1 (fr) 1996-05-17 1996-05-17 Système acoustique à effet spatial

Publications (2)

Publication Number Publication Date
EP0808076A1 EP0808076A1 (fr) 1997-11-19
EP0808076B1 true EP0808076B1 (fr) 2007-11-21

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EP96107860A Expired - Lifetime EP0808076B1 (fr) 1996-05-17 1996-05-17 Système acoustique à effet spatial

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US (1) US6122381A (fr)
EP (1) EP0808076B1 (fr)
JP (1) JPH1094099A (fr)
KR (1) KR100437174B1 (fr)
DE (1) DE59611450D1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2120486A1 (fr) 2008-05-16 2009-11-18 Micronas GmbH Dispositif et procédé destinés à produire un son spatial

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US6647119B1 (en) * 1998-06-29 2003-11-11 Microsoft Corporation Spacialization of audio with visual cues
US6590983B1 (en) * 1998-10-13 2003-07-08 Srs Labs, Inc. Apparatus and method for synthesizing pseudo-stereophonic outputs from a monophonic input
JP4300380B2 (ja) * 1999-12-02 2009-07-22 ソニー株式会社 オーディオ再生装置およびオーディオ再生方法
CN1227950C (zh) * 1999-05-13 2005-11-16 汤姆森特许公司 立体声音响系统
US6879952B2 (en) 2000-04-26 2005-04-12 Microsoft Corporation Sound source separation using convolutional mixing and a priori sound source knowledge
US7136493B2 (en) * 2000-06-28 2006-11-14 Peavey Electronics Corporation Sub-harmonic generator and stereo expansion processor
US7451006B2 (en) * 2001-05-07 2008-11-11 Harman International Industries, Incorporated Sound processing system using distortion limiting techniques
US7447321B2 (en) 2001-05-07 2008-11-04 Harman International Industries, Incorporated Sound processing system for configuration of audio signals in a vehicle
US6804565B2 (en) 2001-05-07 2004-10-12 Harman International Industries, Incorporated Data-driven software architecture for digital sound processing and equalization
US7492908B2 (en) * 2002-05-03 2009-02-17 Harman International Industries, Incorporated Sound localization system based on analysis of the sound field
US7242779B2 (en) * 2002-05-30 2007-07-10 Peavey Electronics Corporation Methods and apparatus for sub-harmonic generation, stereo expansion and distortion
JP2004166033A (ja) * 2002-11-14 2004-06-10 Victor Co Of Japan Ltd オーディオ・エフェクタ回路
US8363865B1 (en) 2004-05-24 2013-01-29 Heather Bottum Multiple channel sound system using multi-speaker arrays
CA2773812C (fr) * 2009-10-05 2016-11-08 Harman International Industries, Incorporated Systeme audio multiplex dote d'une compensation de canal audio

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2120486A1 (fr) 2008-05-16 2009-11-18 Micronas GmbH Dispositif et procédé destinés à produire un son spatial

Also Published As

Publication number Publication date
KR100437174B1 (ko) 2004-09-07
KR970078741A (ko) 1997-12-12
JPH1094099A (ja) 1998-04-10
US6122381A (en) 2000-09-19
DE59611450D1 (de) 2008-01-03
EP0808076A1 (fr) 1997-11-19

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