EP3366048A1 - Neuartiges verfahren zur reduzierung akustischer phasenverzerrungen in einem kraftfahrzeug - Google Patents
Neuartiges verfahren zur reduzierung akustischer phasenverzerrungen in einem kraftfahrzeugInfo
- Publication number
- EP3366048A1 EP3366048A1 EP16809897.8A EP16809897A EP3366048A1 EP 3366048 A1 EP3366048 A1 EP 3366048A1 EP 16809897 A EP16809897 A EP 16809897A EP 3366048 A1 EP3366048 A1 EP 3366048A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- phase
- channels
- distortions
- stereophonic
- distortion
- 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.)
- Withdrawn
Links
- 238000000034 method Methods 0.000 title claims abstract description 22
- 230000008569 process Effects 0.000 claims description 4
- 238000009434 installation Methods 0.000 claims 2
- 230000001850 reproductive effect Effects 0.000 claims 1
- 239000004020 conductor Substances 0.000 description 2
- PSFDQSOCUJVVGF-UHFFFAOYSA-N harman Chemical compound C12=CC=CC=C2NC2=C1C=CN=C2C PSFDQSOCUJVVGF-UHFFFAOYSA-N 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 238000011282 treatment Methods 0.000 description 2
- 241000644784 Distorsio Species 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000004807 localization Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000010363 phase shift Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000009877 rendering Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04S—STEREOPHONIC SYSTEMS
- H04S7/00—Indicating arrangements; Control arrangements, e.g. balance control
- H04S7/30—Control circuits for electronic adaptation of the sound field
- H04S7/301—Automatic calibration of stereophonic sound system, e.g. with test microphone
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R5/00—Stereophonic arrangements
- H04R5/02—Spatial or constructional arrangements of loudspeakers
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- 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
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2499/00—Aspects covered by H04R or H04S not otherwise provided for in their subgroups
- H04R2499/10—General applications
- H04R2499/13—Acoustic transducers and sound field adaptation in vehicles
-
- 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
- H04S2400/09—Electronic reduction of distortion of stereophonic sound systems
Definitions
- the stereophonic process makes it possible to obtain a continuous and homogeneous sound image from two point sources provided that the listener is located equidistant from these two sources.
- the difference in distance between the speakers and the listeners generates distortions of levels and acoustic phases between the 2 channels which deeply degrade the stereophonic reproduction by car.
- the present invention belongs to the category of bi-stereophonic methods.
- All of these methods recommend inverting the stereo phase in certain frequency bands in order to reduce the acoustic phase distortion between the channels and they differ mainly in the operating mode used.
- Inverting the stereophonic phase consists in applying a phase difference of 180 ° between the two channels, for example by inverting the phase of one of the two channels.
- phase distortion changes sign and its modulus becomes the 180 ° complement of the original distortion.
- the present invention is a novel method for improving automobile stereophonic reproduction in a real vehicle to obtain a better result than that obtained by known methods, and this by using the difference between the phase distortions at the two locations of listening.
- a microphone was placed at each listening position and a pink noise signal was successively applied to each left and right speaker.
- a signal is applied to the left speaker and the phase difference [ ⁇ 0 - ⁇ ⁇ ? ] 0 between the signal generated by the left microphone and the signal applied to the left speaker.
- a signal is applied to the right speaker and the phase difference [ ⁇ ⁇ ⁇ ⁇ . ";] ⁇ is measured between the signal generated by the microphone on the left and the signal applied to the right speaker. .
- the average phase distortion (average absolute values between 100 Hz and 1600 Hz) is 101 ° driver side and 116 ° passenger side a total of 217 ° an average of 108.5 °.
- the solid curve is the distortion of driver's side residual phase and the dotted curve is the distortion residual passenger side stage after application '' of a reversal of the phase of a channel according to the conventional method c at frequencies favoring the conductor, namely between 100 Hz and 315 Hz and between 1000 Hz and 1250 Hz.
- the residual distortions are 34 ° driver side and 62 ° passenger side a total of 96 ° and an average of 48 °.
- the first of the two main ideas of the present invention is to apply a specific treatment to the frequency bands for which [O c -0 0 ] G and [ ⁇ ⁇ - ⁇ ] ⁇ are not of the same sign.
- the necessary and sufficient condition to obtain a minimum of total distortion at a frequency 'for which the distortions on the right and on the left are not of the same sign is to apply a phase shift between the two channels that make them the same sign.
- the sum of the distortions obtained is then equal to the difference between the original distortions.
- ⁇ 0 ⁇ be the phase correction to be applied to the left channel to symmetrize the phase distortions. If symmetrization is possible ⁇ ⁇ must be the solution of 1 equation:
- Equation 4 has a solution that is:
- the curves in fine lines are the original distortions and the thick curve symmetrized phase distortion that stands out at an average of 66 °.
- the fine-line curves are the left and right distortions obtained by the traditional method, that is to say the curves of FIG. 2, and the thick line curve is the residual distortion after symmetrization and inversion of the phase. a channel between 100 Hz and 160Hz and between 315 Hz and 400 Hz. The residual distortion is apparent on both sides at 31 Hz, ie a total of 62 ° compared to the total of 96 ° obtained with the old method, which represents a decrease of 35 % of total distortions.
- This improvement is due to the treatments that are applied to the frequencies where the distortions are not of the same sign the symmetrization being a particular case.
- This process may be the subject of an electro-acoustic device for equipping motor vehicles.
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Stereophonic System (AREA)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR1502209A FR3042673B1 (fr) | 2015-10-20 | 2015-10-20 | Nouveau procede de diminution des distorsions de phase acoustique dans les installations de reproduction sonore en automobile |
PCT/FR2016/000169 WO2017068249A1 (fr) | 2015-10-20 | 2016-10-17 | Nouveau procédé de diminution des distorsions de phases acoustiques en automobile |
Publications (1)
Publication Number | Publication Date |
---|---|
EP3366048A1 true EP3366048A1 (de) | 2018-08-29 |
Family
ID=55361535
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP16809897.8A Withdrawn EP3366048A1 (de) | 2015-10-20 | 2016-10-17 | Neuartiges verfahren zur reduzierung akustischer phasenverzerrungen in einem kraftfahrzeug |
Country Status (5)
Country | Link |
---|---|
US (1) | US20190069113A1 (de) |
EP (1) | EP3366048A1 (de) |
JP (1) | JP2018535597A (de) |
FR (1) | FR3042673B1 (de) |
WO (1) | WO2017068249A1 (de) |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2536044Y2 (ja) | 1986-09-19 | 1997-05-21 | パイオニア株式会社 | 両耳相関係数補正装置 |
DE3932858C2 (de) | 1988-12-07 | 1996-12-19 | Onkyo Kk | Stereophonisches Wiedergabesystem |
US6038323A (en) | 1997-11-17 | 2000-03-14 | Harman Motive Inc. | Stereophonic image enhancement system for use in automobiles |
FR2839602A1 (fr) * | 2002-05-13 | 2003-11-14 | Claude Bernard Roch Carpentier | Dispositif de reproduction sonore stereophonique dans un vehicule et vehicule ainsi equipe |
TW200810582A (en) | 2006-03-15 | 2008-02-16 | Dolby Lab Licensing Corp | Stereophonic sound imaging |
FR2985144B1 (fr) * | 2011-12-21 | 2014-08-22 | Claude Bernard Roch Andre Carpentier | Nouveau dispositif de reproduction sonore stereophonique pour vehicule automobile et vehicule ainsi equipe |
ES2683821T3 (es) * | 2012-03-22 | 2018-09-28 | Dirac Research Ab | Diseño de controlador de precompensación de audio usando un conjunto variable de altavoces de soporte |
-
2015
- 2015-10-20 FR FR1502209A patent/FR3042673B1/fr active Active
-
2016
- 2016-10-17 JP JP2018520615A patent/JP2018535597A/ja active Pending
- 2016-10-17 US US15/768,982 patent/US20190069113A1/en not_active Abandoned
- 2016-10-17 EP EP16809897.8A patent/EP3366048A1/de not_active Withdrawn
- 2016-10-17 WO PCT/FR2016/000169 patent/WO2017068249A1/fr active Application Filing
Also Published As
Publication number | Publication date |
---|---|
FR3042673A1 (fr) | 2017-04-21 |
WO2017068249A1 (fr) | 2017-04-27 |
FR3042673B1 (fr) | 2022-05-27 |
US20190069113A1 (en) | 2019-02-28 |
JP2018535597A (ja) | 2018-11-29 |
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Legal Events
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Extension state: BA ME |
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DAV | Request for validation of the european patent (deleted) | ||
DAX | Request for extension of the european patent (deleted) | ||
STAA | Information on the status of an ep patent application or granted ep patent |
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18D | Application deemed to be withdrawn |
Effective date: 20200603 |