EP3811634A1 - Verfahren zum gleichzeitigen betreiben einer lautsprecheranordnung in einer lautsprecherfunktion und in einer mikrofonfunktion sowie lautsprecheranordnung - Google Patents
Verfahren zum gleichzeitigen betreiben einer lautsprecheranordnung in einer lautsprecherfunktion und in einer mikrofonfunktion sowie lautsprecheranordnungInfo
- Publication number
- EP3811634A1 EP3811634A1 EP19728371.6A EP19728371A EP3811634A1 EP 3811634 A1 EP3811634 A1 EP 3811634A1 EP 19728371 A EP19728371 A EP 19728371A EP 3811634 A1 EP3811634 A1 EP 3811634A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- coil
- membrane
- function
- loudspeaker
- magnet
- 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- Withdrawn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
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
- H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
- H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
- H04R9/02—Details
- H04R9/025—Magnetic circuit
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
- H04R29/00—Monitoring arrangements; Testing arrangements
- H04R29/001—Monitoring arrangements; Testing arrangements for loudspeakers
- H04R29/003—Monitoring arrangements; Testing arrangements for loudspeakers of the moving-coil type
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
- H04R29/00—Monitoring arrangements; Testing arrangements
- H04R29/004—Monitoring arrangements; Testing arrangements for microphones
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
- H04R3/00—Circuits for transducers
- H04R3/005—Circuits for transducers for combining the signals of two or more microphones
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
- H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
- H04R9/02—Details
- H04R9/04—Construction, mounting, or centering of coil
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
- H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
- H04R9/06—Loudspeakers
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
- H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
- H04R9/08—Microphones
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
- H04R2400/00—Loudspeakers
- H04R2400/01—Transducers used as a loudspeaker to generate sound aswell as a microphone to detect sound
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; 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
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
- H04R3/00—Circuits for transducers
Definitions
- the present invention relates to a method for simultaneously operating a loudspeaker arrangement in a loudspeaker function and in a microphone function, the loudspeaker arrangement comprising a coil which is movably mounted in the magnetic field of a magnet, and a membrane which is mechanically coupled to the coil, the magnet generates a magnetic flux density, the coil having an effective length in the magnetic field, the membrane having a surface. It also relates to a loudspeaker arrangement which comprises a coil which is movably mounted in the magnetic field of a magnet, and a membrane which is mechanically coupled to the coil, the magnet being designed to generate a magnetic flux density, the coil being a effective length in the magnetic field, wherein the membrane has a surface.
- an ANC active noise cancellation
- loudspeakers as actuators to generate the counter-sound
- microphones as sensors to detect the sound field, which at best can be canceled out by a control circuit.
- Speakers and microphones are also provided as separate, independent components in mobile telephones.
- DE 10 2005 058 175 A1 discloses a loudspeaker arrangement for sound reinforcement in a motor vehicle, the loudspeaker also being a Microphone is used.
- the speaker can be used in one position as a microphone and / or as an acoustic damping element, in another position in addition to its sound radiation function, it can also be used as an image projection surface for visual infotainment applications.
- This publication does not indicate that a loudspeaker can be used in a loudspeaker function and in a microphone function at the same time.
- DE 200 13 346 U1 discloses a loudspeaker arrangement in a driver's cabin, in which it is proposed to use at least one of the loudspeakers as a microphone for voice input. This publication also does not show that the loudspeaker arrangement can be used simultaneously in a loudspeaker function and in a microphone function.
- EP 3 185 244 A1 describes a speech recognition system with a microphone and at least one loudspeaker which is used as a microphone.
- the loudspeaker is also used in this publication either in its loudspeaker function or in its microphone function, but not simultaneously in both functions.
- the object of the present invention is therefore to simultaneously provide a loudspeaker function and a microphone function with a reduced space requirement, reduced weight and the lowest possible cost.
- the present invention is based on the knowledge that a skilful analysis of the conditions in a loudspeaker arrangement opens up the possibility of operating the loudspeaker arrangement simultaneously in a loudspeaker function and in a microphone function.
- the loudspeaker serves simultaneously as a measuring device, ie as a sensor, and as a conventional loudspeaker, ie as an actuator.
- the loudspeaker arrangement comprising a coil which is movably mounted in the magnetic field of a magnet, and a membrane which is mechanically coupled to the coil, wherein the magnet generates a magnetic flux density B, the coil having an effective length l 12 in the magnetic field, the membrane having a surface A, the external sound pressure p acting on the membrane is determined in the microphone function as follows: a) Setting a first calibration state, in which an external sound pressure p on the membrane is zero, and measuring a current I flowing into the coil and a voltage U falling across the coil;
- a loudspeaker function and a microphone function can be implemented simultaneously by a method according to the invention and by a loudspeaker arrangement according to the invention, so that a separate microphone can be dispensed with. This results in a reduction in the installation space required, the costs, the weight and the effort for wiring and connections.
- a one-off calibration, for example at the factory, is sufficient to determine the relevant transfer functions.
- a preferred embodiment is characterized in that the sound pressure p on the membrane 16 is calculated in accordance with
- a preferred embodiment is characterized in that the first and the second transfer function are determined as a function of frequency.
- the current and voltage measurement in steps a), c) and e) is preferably also frequency-dependent.
- steps a) to d) are repeated after the loudspeaker arrangement has been installed in an operating environment, in particular at predeterminable time intervals or upon user input.
- This measure supports This takes into account the fact that, depending on the operating environment, ie depending on the installation location, different attenuations and reflections can occur, which lead to different frequency responses of the transmission functions compared to the values determined in the factory. It can also be used to adapt to aging effects, different temperatures or air humidity. Because the calibration is carried out in the operating environment, the method according to the invention can thus be optimized, which results in a particularly low-distortion reproduction of the loudspeaker signals and a low-distortion recording of microphone signals. Further preferred embodiments result from the subclaims.
- the present invention also relates to a loudspeaker arrangement which comprises a coil which is movably mounted in the magnetic field of a magnet, and a membrane which is mechanically coupled to the coil, the magnet being designed to generate a magnetic flux density B, the coil has an effective length 112 in the magnetic field, the membrane having an area A.
- a loudspeaker arrangement according to the invention further comprises a memory device in which a first transfer function ZM and a second transfer function ZC are stored. Furthermore, it comprises a measuring device which is designed to measure a current I flowing into the coil and a voltage U dropping across the coil.
- a computing device a computing device which is designed to work simultaneously with a loudspeaker function the microphone arrangement of the loudspeaker arrangement to calculate the external sound pressure p on the membrane 16 taking into account the magnetic flux density B, the effective length 112 of the coil 12 in the magnetic field of the magnet 14, the first transfer function ZM, the second transfer function ZC, the area A of the Membrane 16 and the current I measured by the measuring device and the voltage U measured by the measuring device.
- the loudspeaker arrangement can have a calibration device which is designed to carry out steps a) to d) repeatedly.
- a predefinable time interval is stored in the memory device, in which the calibration is repeated.
- the loudspeaker arrangement preferably comprises a time measuring device, a control device being provided which is designed to repeat the calibration steps for determining both transmission functions at the time intervals stored in the memory device, the computing device being designed to calculate the external sound pressure on the membrane to access the currently determined transfer functions.
- a manual operating device can be provided in order to manually trigger a calibration process by a user.
- FIG. 1 shows a schematic illustration of a loudspeaker arrangement according to the invention.
- FIG. 2 shows a signal flow graph for representing an imaging function within the scope of the method according to the invention.
- FIG. 1 shows a schematic illustration of a loudspeaker arrangement 10 with a coil 12 which is movably mounted in the magnetic field of a magnet 14.
- the loudspeaker arrangement 10 comprises a membrane 16, which is mechanically coupled to the coil 12.
- the magnet 14 generates a magnetic flux density B.
- the coil 12 has an effective length l 12 in the magnetic field of the magnet 14.
- the membrane 16 has an area A. 1 shows the sizes for a mechanical circuit that can be defined in the loudspeaker arrangement, see FIG. 1 on the right, and an electrical circuit, see FIG. 1 on the left.
- R is the ohmic resistance of the coil 12; u (t) a voltage applied to the coil 12; and i (t) a current flowing through the coil 12.
- the electromotive force e (t) arises due to the movement of the coil 12 in the magnetic field of the magnet 14.
- reaction force f a of the loudspeaker on connection can be determined as follows:
- the upper line accordingly shows the mechanical conditions, while the lower line shows the electrical conditions of the loudspeaker arrangement 10.
- s is the Laplace variable.
- This equation represents an equation system for the two unknowns sX-i (s) and Ap (s) if the two variables l (s) and U (s) are specified. I.e. if the current I (s) and the voltage U (s) are known, the sound pressure p (s) or the external force Ap (s) on the membrane 16 can be calculated.
- An elimination of the relative speed sX-i (s) in the last equation gives:
- Z c (s) can be determined by setting a second calibration state in which a movement sX-i (s) of the membrane 16 is suppressed. To do this the coil 12 and the magnet 14 are firmly clamped to one another in a fixed position, so that sX-i (s) is equal to zero. The current I (s) flowing into the coil and the voltage U (s) dropping across the coil are then determined again. The transfer function Z c (s) can be determined from the measured values
- the sound pressure p (t) acting on the membrane 16 can be determined, although the membrane 16 is operated simultaneously in a loudspeaker function.
- a microphone function and a loudspeaker function of the loudspeaker arrangement 10 are made possible at the same time.
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Otolaryngology (AREA)
- Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102018215411.2A DE102018215411B3 (de) | 2018-09-11 | 2018-09-11 | Verfahren zum gleichzeitigen Betreiben einer Lautsprecheranordnung in einer Lautsprecherfunktion und in einer Mikrofonfunktion sowie Lautsprecheranordnung |
| PCT/EP2019/063823 WO2020052820A1 (de) | 2018-09-11 | 2019-05-28 | Verfahren zum gleichzeitigen betreiben einer lautsprecheranordnung in einer lautsprecherfunktion und in einer mikrofonfunktion sowie lautsprecheranordnung |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP3811634A1 true EP3811634A1 (de) | 2021-04-28 |
Family
ID=66752078
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP19728371.6A Withdrawn EP3811634A1 (de) | 2018-09-11 | 2019-05-28 | Verfahren zum gleichzeitigen betreiben einer lautsprecheranordnung in einer lautsprecherfunktion und in einer mikrofonfunktion sowie lautsprecheranordnung |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US11146890B2 (de) |
| EP (1) | EP3811634A1 (de) |
| CN (1) | CN112740720A (de) |
| DE (1) | DE102018215411B3 (de) |
| WO (1) | WO2020052820A1 (de) |
Family Cites Families (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE744088C (de) | 1938-05-10 | 1944-01-08 | Siemens Ag | Lautfernsprechanlage mit Rueckkopplungssperre |
| DE856752C (de) | 1944-06-16 | 1952-11-24 | Siemens Ag | Gegensprechschaltung mit Verstaerker fuer den Verkehr zwischen zwei oder mehreren Lautsprecherstationen |
| US4956868A (en) * | 1989-10-26 | 1990-09-11 | Industrial Research Products, Inc. | Magnetically shielded electromagnetic acoustic transducer |
| DE20013346U1 (de) | 2000-08-02 | 2000-11-16 | Still GmbH, 22113 Hamburg | Lautsprecheranordnung in einer Fahrerkabine |
| US7043028B2 (en) | 2001-12-21 | 2006-05-09 | Tymphany Corporation | Method and system for using an audio transducer as both an input and output device in full duplex operation |
| DE102005058175A1 (de) | 2005-12-05 | 2007-06-06 | Volkswagen Ag | Lautsprecheranordnung zur Beschallung in einem Kraftfahrzeug |
| CN201100959Y (zh) * | 2006-06-28 | 2008-08-13 | 胡强 | 骨感应音频双向收发装置 |
| EP2202998B1 (de) | 2008-12-29 | 2014-02-26 | Nxp B.V. | Vorrichtung und Verfahren zur Verarbeitung von Audiodaten |
| US10225653B2 (en) * | 2013-03-14 | 2019-03-05 | Cirrus Logic, Inc. | Systems and methods for using a piezoelectric speaker as a microphone in a mobile device |
| US9215532B2 (en) * | 2013-03-14 | 2015-12-15 | Cirrus Logic, Inc. | Systems and methods for using a speaker as a microphone in a mobile device |
| EP3185244B1 (de) | 2015-12-22 | 2019-02-20 | Nxp B.V. | Sprachaktivierungssystem |
| CN207443128U (zh) * | 2017-12-06 | 2018-06-01 | 深圳市德晟摩拜科技有限公司 | 一种带助听功能的移动终端 |
| US10506336B1 (en) * | 2018-07-26 | 2019-12-10 | Cirrus Logic, Inc. | Audio circuitry |
-
2018
- 2018-09-11 DE DE102018215411.2A patent/DE102018215411B3/de not_active Expired - Fee Related
-
2019
- 2019-05-28 EP EP19728371.6A patent/EP3811634A1/de not_active Withdrawn
- 2019-05-28 US US17/274,731 patent/US11146890B2/en not_active Expired - Fee Related
- 2019-05-28 CN CN201980059029.8A patent/CN112740720A/zh active Pending
- 2019-05-28 WO PCT/EP2019/063823 patent/WO2020052820A1/de not_active Ceased
Also Published As
| Publication number | Publication date |
|---|---|
| WO2020052820A1 (de) | 2020-03-19 |
| CN112740720A (zh) | 2021-04-30 |
| DE102018215411B3 (de) | 2019-12-12 |
| US20210250692A1 (en) | 2021-08-12 |
| US11146890B2 (en) | 2021-10-12 |
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