EP1540987A1 - Pa-system-installationsverfahren - Google Patents

Pa-system-installationsverfahren

Info

Publication number
EP1540987A1
EP1540987A1 EP03757113A EP03757113A EP1540987A1 EP 1540987 A1 EP1540987 A1 EP 1540987A1 EP 03757113 A EP03757113 A EP 03757113A EP 03757113 A EP03757113 A EP 03757113A EP 1540987 A1 EP1540987 A1 EP 1540987A1
Authority
EP
European Patent Office
Prior art keywords
sfmoy
response
enclosure
impulse response
product
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
EP03757113A
Other languages
English (en)
French (fr)
Other versions
EP1540987B1 (de
Inventor
Jacques Lewiner
Sylvain Javelot
Damien Lebrun
Stéphane DEBUSNE
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.)
Cynove SARL
Original Assignee
Cynove SARL
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Cynove SARL filed Critical Cynove SARL
Publication of EP1540987A1 publication Critical patent/EP1540987A1/de
Application granted granted Critical
Publication of EP1540987B1 publication Critical patent/EP1540987B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04RLOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R27/00Public address systems
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04RLOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R3/00Circuits for transducers, loudspeakers or microphones
    • H04R3/04Circuits 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)
EP03757113A 2002-06-10 2003-06-06 Verfahren zum Einstellen einer Beschallungsanlage Expired - Lifetime EP1540987B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR0207110A FR2840759B1 (fr) 2002-06-10 2002-06-10 Procede de sonorisation
FR0207110 2002-06-10
PCT/FR2003/001694 WO2003105525A1 (fr) 2002-06-10 2003-06-06 Procede de sonorisation

Publications (2)

Publication Number Publication Date
EP1540987A1 true EP1540987A1 (de) 2005-06-15
EP1540987B1 EP1540987B1 (de) 2012-05-30

Family

ID=29559099

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03757113A Expired - Lifetime EP1540987B1 (de) 2002-06-10 2003-06-06 Verfahren zum Einstellen einer Beschallungsanlage

Country Status (6)

Country Link
US (1) US7171005B2 (de)
EP (1) EP1540987B1 (de)
AU (1) AU2003258785A1 (de)
DK (1) DK1540987T3 (de)
FR (1) FR2840759B1 (de)
WO (1) WO2003105525A1 (de)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
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 (de) * 2018-01-05 2020-07-29 Infineon Technologies AG Photoakustisches system und verfahren zur abschätzung einer gaskonzentration
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

Family Cites Families (12)

* Cited by examiner, † Cited by third party
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
US4683590A (en) * 1985-03-18 1987-07-28 Nippon Telegraph And Telphone Corporation Inverse control system
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
GB9026906D0 (en) * 1990-12-11 1991-01-30 B & W Loudspeakers Compensating filters
US5384856A (en) * 1991-01-21 1995-01-24 Mitsubishi Denki Kabushiki Kaisha Acoustic system
US5572443A (en) * 1993-05-11 1996-11-05 Yamaha Corporation Acoustic characteristic correction device
DE4332804C2 (de) * 1993-09-27 1997-06-05 Klippel Wolfgang Adaptive Korrekturschaltung für elektroakustische Schallsender
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

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO03105525A1 *

Also Published As

Publication number Publication date
AU2003258785A1 (en) 2003-12-22
FR2840759B1 (fr) 2004-07-23
US7171005B2 (en) 2007-01-30
FR2840759A1 (fr) 2003-12-12
US20050226440A1 (en) 2005-10-13
DK1540987T3 (da) 2012-08-20
EP1540987B1 (de) 2012-05-30
WO2003105525A1 (fr) 2003-12-18

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