WO2003105525A1 - Procede de sonorisation - Google Patents
Procede de sonorisation Download PDFInfo
- Publication number
- WO2003105525A1 WO2003105525A1 PCT/FR2003/001694 FR0301694W WO03105525A1 WO 2003105525 A1 WO2003105525 A1 WO 2003105525A1 FR 0301694 W FR0301694 W FR 0301694W WO 03105525 A1 WO03105525 A1 WO 03105525A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- sfmoy
- response
- enclosure
- impulse response
- product
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R27/00—Public address systems
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R3/00—Circuits for transducers, loudspeakers or microphones
- H04R3/04—Circuits for transducers, loudspeakers or microphones for correcting frequency response
Definitions
- the present invention relates to sound systems, comprising a correction of the response of loudspeakers.
- the amplitude can be corrected at an amplifier which powers one or more speakers, by using a gain gauge of the amplifier as a function of the frequency.
- a gain gauge of the amplifier as a function of the frequency.
- a second approach widely used to correct the • response of a speaker, consists of. group together in one enclosure several speakers each having good characteristics in a given spectral band and to interpose between the input of the speaker and the speakers, filters which will selectively send to each speaker the spectral components of the electrical signal best suited to this speaker.
- This method which makes it possible to improve the overall amplitude response of the enclosure, has the serious drawback of introducing phase shifts on several levels in the system and thus of not allowing faithful reproduction as regards the phase of the signals. to reproduce.
- Another known technique uses, from the initial impulse response of the acoustic enclosure, a series of operations based on the Fourier transformation to first obtain the response of the speaker in the frequency domain, in amplitude and in phase and secondly, the template of a corrective filter, which, used to power the speaker, is supposed to correct phase faults while respecting in theory the amplitude of the signals.
- the practical implementation of such a solution from signal processing processors has serious drawbacks.
- the object of the present invention is in particular to propose a method for correcting the response of an acoustic enclosure which makes it possible to conserve the phase of the signals to be reproduced in a wide frequency band, while requiring reduced computing power compatible with the dimensions and the costs of sound reproduction devices for the general public.
- ® is the mathematical operator convolution product
- the method according to the invention requires only a relatively low computing capacity, compatible with the moderate costs required for devices intended for the general public.
- the inventors have observed that the clipping of the signal S (f) does not harm the quality of listening, thanks to a so-called "mask effect", which makes the human ear discern with reduced sensitivity the sounds of frequency close to a given frequency where a signal is clearly audible.
- the listening quality obtained thanks to the present invention is therefore excellent, at a moderate cost.
- FIG. 1 is a block diagram showing an example of a device that can implement the method according to the invention, in normal operation, that is to say during the aforementioned sound reinforcement phase
- FIG. 2 is a diagram similar to FIG. 1, showing the device during the initial learning phase.
- the method according to the invention makes it possible to add sound to a space 100 while ensuring optimal listening to a listener 102 in a target area 101 of the space 100.
- the sound space 100 may for example be a listening room equipped with at least one acoustic enclosure 2, comprising a number n of speakers 22, 24, n being a natural number at least equal to 1, for example equal to 2 or higher.
- the loudspeakers 22, 24 of the enclosure 2 can for example be supplied by a common input 25 through passive filters, respectively 21, 23.
- the input 25 receives an electrical signal P (t) coming from a computer 5 and amplified by an amplifier 6 (the amplifier 6 and the computer 5 can of course be included in the same housing).
- the computer 5 can include, for example: - a calculation unit 51 which receives an electrical signal X (t) to be reproduced in sound form in space 100 (t represents time), a correction filter 54 of template W (t) receiving the signals from the calculation unit 51, - and a digital-analog converter 52 which receives the digital signals from the filter 52 and sends corresponding analog signals to the amplifier 6.
- the above-mentioned filter 54 may simply be a software module loaded in the computer 5 and that the digital-analog converter could be eliminated by using digital speakers.
- the method according to the invention makes it possible in particular to avoid the phase shifts that the sound waves usually undergo when they arrive at the listener 102, with the systems of the prior art.
- These phase shifts have several origins, in particular: the passive filters 21 and 23 present in the enclosure 2 are different and therefore they introduce different phase shifts, - in the same way, the n speakers 22, 24 are different and introduce different phase shifts, etc.
- the electrical signal X (t) is processed by the correction filter 54 of the computer 5 during the sound phases, that is to say during normal operation of the public address system.
- the calibration point 103 may for example be located between 50 cm and 1 m 50 above the ground.
- the impulse response S (t) corresponds to the acoustic signal received at point 103 when the acoustic enclosure emits an acoustic impulse of short duration.
- This impulse response can preferably be measured at a time when the space 100 is not polluted by other acoustic signals than those emitted by the enclosure 2, for example by having the emitter by the enclosure 2 a short acoustic pulse. and by measuring the acoustic signals received following this pulse at the calibration point 103, by means of a microphone 11 previously disposed at point 103.
- the acoustic enclosure 2 receives from the computer 5 the impulse signal to be transmitted.
- the microphone 11 located at the calibration point 103 is connected to an amplifier 12 itself connected to an analog-digital converter 3, this converter being able for example to be connected to the computer 5, so that the signals picked up by the microphone 11 can be memorized by the computer 5 for the calibration point 103.
- the microphone 11 is dismantled with its amplifier 12 and its converter 3.
- the computer 5 determines by a fast Fourier transform technique the frequency response S (f) of the impulse response S (t ). Recall that for an input vector S (t) comprising 2 K samples, S (f) is a vector of 2 K samples with:
- the computer 5 performs the following sequence of operations: it determines and stores the module of S (f), namely
- the filter template (t) is then obtained by the computer 5 by carrying out the convolution product S (-t) with I (t), which makes it possible to set up the filter software module 54 in the computer 5 and closes the learning stage.
- the impulse response S (t) is determined otherwise than by causing acoustic impulse signals to be emitted, for example by causing white noise to emit or sequences of predetermined signals whose can extract the answer S (t) by known calculation methods per se, explained for example in document FR-A-2,747,863 for the calculation of impulse responses in the field of radio waves.
- the space to be sounded would be other than a listening room, for example an anechoid room, the objective being in this case for example to produce a set of processing unit and acoustic enclosure such as the phase of the acoustic waves emitted by the 'acoustic enclosure respects the phase of the electrical signals sent to the input of said assembly.
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Soundproofing, Sound Blocking, And Sound Damping (AREA)
- Circuit For Audible Band Transducer (AREA)
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP03757113A EP1540987B1 (fr) | 2002-06-10 | 2003-06-06 | Procédé de réglage d'un système de sonorisation. |
DK03757113.0T DK1540987T3 (da) | 2002-06-10 | 2003-06-06 | Indstillingsmetode til et system med lydspredning |
US10/517,431 US7171005B2 (en) | 2002-06-10 | 2003-06-06 | P.A. system installation method |
AU2003258785A AU2003258785A1 (en) | 2002-06-10 | 2003-06-06 | P.a. system installation method |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0207110A FR2840759B1 (fr) | 2002-06-10 | 2002-06-10 | Procede de sonorisation |
FR02/07110 | 2002-06-10 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2003105525A1 true WO2003105525A1 (fr) | 2003-12-18 |
Family
ID=29559099
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/FR2003/001694 WO2003105525A1 (fr) | 2002-06-10 | 2003-06-06 | Procede de sonorisation |
Country Status (6)
Country | Link |
---|---|
US (1) | US7171005B2 (fr) |
EP (1) | EP1540987B1 (fr) |
AU (1) | AU2003258785A1 (fr) |
DK (1) | DK1540987T3 (fr) |
FR (1) | FR2840759B1 (fr) |
WO (1) | WO2003105525A1 (fr) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8249260B2 (en) * | 2007-04-13 | 2012-08-21 | Qualcomm Incorporated | Method and apparatus for audio path filter tuning |
EP3508836B1 (fr) * | 2018-01-05 | 2020-07-29 | Infineon Technologies AG | Système et procédé photoacoustique permettant d'estimer la concentration d'un gaz |
GB2600538B (en) * | 2020-09-09 | 2023-04-05 | Tymphany Worldwide Enterprises Ltd | Method of providing audio in a vehicle, and an audio apparatus for a vehicle |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4683590A (en) * | 1985-03-18 | 1987-07-28 | Nippon Telegraph And Telphone Corporation | Inverse control system |
US5694476A (en) * | 1993-09-27 | 1997-12-02 | Klippel; Wolfgang | Adaptive filter for correcting the transfer characteristic of electroacoustic transducer |
US5815580A (en) * | 1990-12-11 | 1998-09-29 | Craven; Peter G. | Compensating filters |
EP1017166A2 (fr) * | 1993-05-11 | 2000-07-05 | Yamaha Corporation | Dispositif de correction des caractéristiques acoustiques |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4458362A (en) | 1982-05-13 | 1984-07-03 | Teledyne Industries, Inc. | Automatic time domain equalization of audio signals |
US4888808A (en) | 1987-03-23 | 1989-12-19 | Matsushita Electric Industrial Co., Ltd. | Digital equalizer apparatus enabling separate phase and amplitude characteristic modification |
JP2646210B2 (ja) * | 1987-05-27 | 1997-08-27 | ヤマハ株式会社 | 電気音響的残響支援装置 |
JP2569872B2 (ja) * | 1990-03-02 | 1997-01-08 | ヤマハ株式会社 | 音場制御装置 |
JPH042928A (ja) * | 1990-04-19 | 1992-01-07 | Matsushita Electric Ind Co Ltd | 音場制御装置 |
US5384856A (en) * | 1991-01-21 | 1995-01-24 | Mitsubishi Denki Kabushiki Kaisha | Acoustic system |
JP3537674B2 (ja) * | 1998-09-30 | 2004-06-14 | パイオニア株式会社 | オーディオシステム |
JP4663085B2 (ja) * | 2000-09-19 | 2011-03-30 | パナソニック株式会社 | 音響再生装置 |
-
2002
- 2002-06-10 FR FR0207110A patent/FR2840759B1/fr not_active Expired - Fee Related
-
2003
- 2003-06-06 WO PCT/FR2003/001694 patent/WO2003105525A1/fr not_active Application Discontinuation
- 2003-06-06 EP EP03757113A patent/EP1540987B1/fr not_active Expired - Lifetime
- 2003-06-06 AU AU2003258785A patent/AU2003258785A1/en not_active Abandoned
- 2003-06-06 US US10/517,431 patent/US7171005B2/en not_active Expired - Lifetime
- 2003-06-06 DK DK03757113.0T patent/DK1540987T3/da active
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4683590A (en) * | 1985-03-18 | 1987-07-28 | Nippon Telegraph And Telphone Corporation | Inverse control system |
US5815580A (en) * | 1990-12-11 | 1998-09-29 | Craven; Peter G. | Compensating filters |
EP1017166A2 (fr) * | 1993-05-11 | 2000-07-05 | Yamaha Corporation | Dispositif de correction des caractéristiques acoustiques |
US5694476A (en) * | 1993-09-27 | 1997-12-02 | Klippel; Wolfgang | Adaptive filter for correcting the transfer characteristic of electroacoustic transducer |
Also Published As
Publication number | Publication date |
---|---|
FR2840759A1 (fr) | 2003-12-12 |
FR2840759B1 (fr) | 2004-07-23 |
EP1540987B1 (fr) | 2012-05-30 |
DK1540987T3 (da) | 2012-08-20 |
US7171005B2 (en) | 2007-01-30 |
AU2003258785A1 (en) | 2003-12-22 |
US20050226440A1 (en) | 2005-10-13 |
EP1540987A1 (fr) | 2005-06-15 |
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