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WO1997003536A1 - Circuit de haut-parleur dote d'un dispositif de controle de la pression au niveau de la membrane du haut-parleur, d'un dispositif de controle de la vitesse de la membrane du haut-parleur et d'un circuit de retour - Google Patents

Circuit de haut-parleur dote d'un dispositif de controle de la pression au niveau de la membrane du haut-parleur, d'un dispositif de controle de la vitesse de la membrane du haut-parleur et d'un circuit de retour Download PDF

Info

Publication number
WO1997003536A1
WO1997003536A1 PCT/GB1996/001622 GB9601622W WO9703536A1 WO 1997003536 A1 WO1997003536 A1 WO 1997003536A1 GB 9601622 W GB9601622 W GB 9601622W WO 9703536 A1 WO9703536 A1 WO 9703536A1
Authority
WO
WIPO (PCT)
Prior art keywords
loudspeaker
velocity
pressure
circuit
monitoring
Prior art date
Application number
PCT/GB1996/001622
Other languages
English (en)
Inventor
Paul Darlington
Original Assignee
University Of Salford
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 University Of Salford filed Critical University Of Salford
Priority to AU63646/96A priority Critical patent/AU6364696A/en
Publication of WO1997003536A1 publication Critical patent/WO1997003536A1/fr

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
    • H04R3/00—Circuits for transducers, loudspeakers or microphones
    • H04R3/002—Damping circuit arrangements for transducers, e.g. motional feedback circuits

Definitions

  • the present invention relates to a loudspeaker circuit, and in particular to a
  • loudspeaker circuit the performance of which can be adapted to the acoustics of the space in which it is placed.
  • the loudspeaker is therefore responsive to externally generated
  • This circuit in essence corrects the relationship between a drive signal applied to a loudspeaker and the desired response of that loudspeaker to a particular drive signal.
  • a loudspeaker circuit comprising a speaker, an input circuit for applying a drive signal to the speaker, means for monitoring the pressure at the speaker, means for monitoring the velocity of the speaker, means defining a desired relationship between the monitored pressure and
  • the acoustic input impedance of a loudspeaker may be considered as the ratio
  • the acoustic input impedance may be
  • the source impedance of a loudspeaker may be controlled by forcing the acoustic input impedance to assume predetermined values. Accordingly, the invention enables the coupling between a loudspeaker and its environment to be
  • the desired relationship between the monitored pressure and velocity may be
  • the loudspeaker operates with a predetermined acoustic input impedance.
  • the desired relationship may represent a predetermined source impedance.
  • the drawing illustrates a loudspeaker circuit comprising a loudspeaker 1 having a diaphragm 2.
  • a miniature accelerometer 3 is attached on the diaphragm and connected to an integrator 4 the output 5 of which represents the instantaneous velocity of the speaker diaphragm.
  • a microphone 6 is also attached to the speaker diaphragm 2, its output representing the total pressure at the surface of the diaphragm.
  • the output 5 of the integrator is applied to a filter 7 which represents the product of the response of the microphone 6 and a desired acoustic impedance.
  • the filter 7 effectively multiplies the monitored velocity by a desired acoustic impedance value and a value representing the manner in which the output of the microphone 6 is inter-related to signals applied to the loudspeaker 1.
  • the signal 8 is applied to a filter 9 to which an input signal 10 is applied in input
  • the filter 9 modifies the input signal
  • the acoustic input impedance of a loudspeaker is the ratio of the total acoustic pressure at the loudspeaker diaphragm surface and the diaphragm velocity.
  • V is the velocity as monitored by the accelerometer 3 and integrator 4
  • A is the desired acoustic impedance.
  • the output of the filter 7 will be identical to the output of the pressure
  • the loudspeaker will cause the loudspeaker to be driven in such a manner that the actual acoustic input impedance is driven towards the desired acoustic input impedance.
  • the loudspeaker can both generate sound and simultaneously control the ratio of the components of pressure at the diaphragm due to sources other than the loudspeaker and the diaphragm velocity. In such a configuration the loudspeaker both produces sound and presents a defined impedance to externally generated sound. Sound
  • the circuit could be configured to provide a predetermined source impedance.
  • a loudspeaker When a loudspeaker is driven by an applied voltage the response ofthe loudspeaker is determined by the electro-mechanical characteristics of the device and, to a lesser extent, by the acoustics of the space in which the loudspeaker is located.
  • a loudspeaker may be considered as a constant source of acoustic pressure, driving a radiation load presented by the room or other space in which the loudspeaker is
  • the source impedance Adopting such a representation of the operation of a loudspeaker, if the source impedance has a very large value then the loudspeaker velocity is not influenced at all by the radiation load and therefore the loudspeaker behaves as a constant velocity source. If the source impedance is zero, the loudspeaker behaves as a constant pressure source.
  • the source impedance can be manipulated using the monitored pressure and velocity signals obtained with the circuit shown in the accompanying drawing. The acoustic input impedance generated for a given input voltage is forced to assume that value which would exist if the loudspeaker had the desired source impedance. Manipulating the source impedance in this matter enables the low frequency acoustics of the space to be influenced, and
  • driving the loudspeaker may be discriminated from those generated by other sources. This can be achieved by measuring the transfer function between the diaphragm
  • each loudspeaker may be provide with means for measuring the pressure its motion causes at the microphone of the other loudspeakers during an initialization phase. Once this coupling has been understood, any interaction between the loudspeakers may be electronically cancelled using essentially the same strategy as that employed within
  • pressure is detected by an electret microphone glued to the loudspeaker diaphragm.
  • Other pressure monitoring devices could of course be used, and the pressure monitoring devices would not have to be mounted directly on the diaphragm.
  • a microphone mounted on a frame immediately in front ofthe diaphragm would be capable of monitoring the pressure.
  • the diaphragm velocity is monitored by an accelerometer mounted directly upon it. It would be possible to detect diaphragm velocity in other ways however, for example by driving a further loudspeaker coil with the same signal applied to the main loudspeaker, the further loudspeaker coil
  • the invention could be used as a combined source (loudspeaker) and absorber
  • An alternative application of the invention is as a combined source / absorber in a reverberation enhancement system in which the existing acoustic modes of the space are suppressed before the reverberation enhancement system adds (through the

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Circuit For Audible Band Transducer (AREA)

Abstract

La présente invention se rapporte à un circuit de haut-parleur dont la performance peut être adaptée à l'acoustique de l'espace dans lequel il est placé. Le circuit de haut-parleur comprend un haut-parleur (1), un circuit d'entrée (11) servant à envoyer un signal de commande au haut-parleur, un premier dispositif (6) tel qu'un microphone qui contrôle la pression au niveau de la membrane du haut-parleur (2), un second dispositif (3, 4) tel qu'un accéléromètre qui contrôle la vitesse de la membrane du haut-parleur et un troisième dispositif (7) tel qu'un filtre qui définit une relation désirée entre la pression et la vitesse contrôlées. Le différence entre la relation désirée et la relation réelle de la pression et la vitesse contrôlées est réduite par un circuit de retour (9) commandant le circuit d'entrée (11). Le troisième dispositif multiplie effectivement la vitesse contrôlée par une valeur d'impédance désirée et une valeur représentant la corrélation entre la sortie du premier dispositif (6) et les signaux de commande envoyés au haut-parleur.
PCT/GB1996/001622 1995-07-07 1996-07-08 Circuit de haut-parleur dote d'un dispositif de controle de la pression au niveau de la membrane du haut-parleur, d'un dispositif de controle de la vitesse de la membrane du haut-parleur et d'un circuit de retour WO1997003536A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU63646/96A AU6364696A (en) 1995-07-07 1996-07-08 Loudspeaker circuit with means for monitoring the pressure at the speaker diaphragm, means for monitoring the velocity of the speaker diaphragm and a feedback circuit

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9513894.7 1995-07-07
GBGB9513894.7A GB9513894D0 (en) 1995-07-07 1995-07-07 Loudspeaker circuit

Publications (1)

Publication Number Publication Date
WO1997003536A1 true WO1997003536A1 (fr) 1997-01-30

Family

ID=10777297

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1996/001622 WO1997003536A1 (fr) 1995-07-07 1996-07-08 Circuit de haut-parleur dote d'un dispositif de controle de la pression au niveau de la membrane du haut-parleur, d'un dispositif de controle de la vitesse de la membrane du haut-parleur et d'un circuit de retour

Country Status (3)

Country Link
AU (1) AU6364696A (fr)
GB (1) GB9513894D0 (fr)
WO (1) WO1997003536A1 (fr)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999059377A1 (fr) * 1998-05-12 1999-11-18 Centre Scientifique Et Technique Du Batiment (Cstb) Dispositif de controle actif d'impedance acoustique
WO2000021331A1 (fr) * 1998-10-06 2000-04-13 Bang & Olufsen A/S Haut-parleur adaptable a un environnent
WO2000074354A1 (fr) * 1999-05-27 2000-12-07 Ericsson Inc. Sortie acoustique a reglage automatique du haut parleur d'un combine telephonique
EP1126684A1 (fr) * 2000-02-14 2001-08-22 Ascom AG Procédé de contrôle du volume sonore d'un transducteur électroacoustique
US8284982B2 (en) 2006-03-06 2012-10-09 Induction Speaker Technology, Llc Positionally sequenced loudspeaker system
DE102013101213A1 (de) * 2013-02-07 2014-08-07 Hochschule Luzern Verfahren zur Messung einer akustischen Übertragungsimpedanz in einem Raum und Messanordnung sowie Messkopf hierfür
US9088841B2 (en) 2011-01-04 2015-07-21 Stmicroelectronics S.R.L. Signal processor and method for compensating loudspeaker aging phenomena
US9813812B2 (en) 2014-12-12 2017-11-07 Analog Devices Global Method of controlling diaphragm excursion of electrodynamic loudspeakers
US9980068B2 (en) 2013-11-06 2018-05-22 Analog Devices Global Method of estimating diaphragm excursion of a loudspeaker
US10219090B2 (en) 2013-02-27 2019-02-26 Analog Devices Global Method and detector of loudspeaker diaphragm excursion
CN110402585A (zh) * 2017-03-10 2019-11-01 三星电子株式会社 室内低频声功率优化方法和装置
EP3583783A4 (fr) * 2017-03-10 2020-03-11 Samsung Electronics Co., Ltd. Procédé et appareil d'optimisation de puissance sonore basse fréquence dans une pièce
FR3104860A1 (fr) * 2019-12-16 2021-06-18 Centre National De La Recherche Scientifique Procede et dispositif de controle de la propagation des ondes acoustiques sur une paroi

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1984000274A1 (fr) * 1982-06-30 1984-01-19 B & W Loudspeakers Systemes de haut-parleurs s'adaptant a l'environnement
JPS59153398A (ja) * 1983-02-21 1984-09-01 Mitsubishi Electric Corp 音響再生装置
EP0171065A2 (fr) * 1984-08-08 1986-02-12 Friedrich Müller Disposition pour la contre-réaction acoustique de haut-parleurs

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1984000274A1 (fr) * 1982-06-30 1984-01-19 B & W Loudspeakers Systemes de haut-parleurs s'adaptant a l'environnement
JPS59153398A (ja) * 1983-02-21 1984-09-01 Mitsubishi Electric Corp 音響再生装置
EP0171065A2 (fr) * 1984-08-08 1986-02-12 Friedrich Müller Disposition pour la contre-réaction acoustique de haut-parleurs

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 009, no. 004 (E - 288) 10 January 1985 (1985-01-10) *

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999059377A1 (fr) * 1998-05-12 1999-11-18 Centre Scientifique Et Technique Du Batiment (Cstb) Dispositif de controle actif d'impedance acoustique
FR2778741A1 (fr) * 1998-05-12 1999-11-19 Scient Et Tech Du Batiment Cst Dispositif de controle actif d'impedance acoustique
WO2000021331A1 (fr) * 1998-10-06 2000-04-13 Bang & Olufsen A/S Haut-parleur adaptable a un environnent
WO2000074354A1 (fr) * 1999-05-27 2000-12-07 Ericsson Inc. Sortie acoustique a reglage automatique du haut parleur d'un combine telephonique
EP1126684A1 (fr) * 2000-02-14 2001-08-22 Ascom AG Procédé de contrôle du volume sonore d'un transducteur électroacoustique
US8284982B2 (en) 2006-03-06 2012-10-09 Induction Speaker Technology, Llc Positionally sequenced loudspeaker system
US9088841B2 (en) 2011-01-04 2015-07-21 Stmicroelectronics S.R.L. Signal processor and method for compensating loudspeaker aging phenomena
DE102013101213B4 (de) * 2013-02-07 2014-12-04 Hochschule Luzern Verfahren zur Messung einer akustischen Übertragungsimpedanz in einem Raum und Messanordnung sowie Messkopf hierfür
DE102013101213A1 (de) * 2013-02-07 2014-08-07 Hochschule Luzern Verfahren zur Messung einer akustischen Übertragungsimpedanz in einem Raum und Messanordnung sowie Messkopf hierfür
US10219090B2 (en) 2013-02-27 2019-02-26 Analog Devices Global Method and detector of loudspeaker diaphragm excursion
US9980068B2 (en) 2013-11-06 2018-05-22 Analog Devices Global Method of estimating diaphragm excursion of a loudspeaker
US9813812B2 (en) 2014-12-12 2017-11-07 Analog Devices Global Method of controlling diaphragm excursion of electrodynamic loudspeakers
CN110402585A (zh) * 2017-03-10 2019-11-01 三星电子株式会社 室内低频声功率优化方法和装置
EP3583783A4 (fr) * 2017-03-10 2020-03-11 Samsung Electronics Co., Ltd. Procédé et appareil d'optimisation de puissance sonore basse fréquence dans une pièce
CN110402585B (zh) * 2017-03-10 2021-12-24 三星电子株式会社 室内低频声功率优化方法和装置
FR3104860A1 (fr) * 2019-12-16 2021-06-18 Centre National De La Recherche Scientifique Procede et dispositif de controle de la propagation des ondes acoustiques sur une paroi
WO2021122394A1 (fr) * 2019-12-16 2021-06-24 Centre National De La Recherche Scientifique Procede et dispositif de controle de la propagation des ondes acoustiques sur une paroi
US12230240B2 (en) 2019-12-16 2025-02-18 Centre National De La Recherche Scientifique Method and device for controlling the propagation of acoustic waves on a wall

Also Published As

Publication number Publication date
AU6364696A (en) 1997-02-10
GB9513894D0 (en) 1995-09-06

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