EP3745738A1 - Akustisches system - Google Patents

Akustisches system Download PDF

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Publication number
EP3745738A1
EP3745738A1 EP19177322.5A EP19177322A EP3745738A1 EP 3745738 A1 EP3745738 A1 EP 3745738A1 EP 19177322 A EP19177322 A EP 19177322A EP 3745738 A1 EP3745738 A1 EP 3745738A1
Authority
EP
European Patent Office
Prior art keywords
exciter
sensor
humidity
temperature
acoustic system
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
EP19177322.5A
Other languages
English (en)
French (fr)
Other versions
EP3745738B1 (de
Inventor
Alexander Dr. Van Laack
Cyril Laury
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.)
Faurecia Innenraum Systeme GmbH
Faurecia Clarion Electronics Europe SAS
Original Assignee
Faurecia Innenraum Systeme GmbH
Parrot Faurecia Automotive SAS
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 Faurecia Innenraum Systeme GmbH, Parrot Faurecia Automotive SAS filed Critical Faurecia Innenraum Systeme GmbH
Priority to EP19177322.5A priority Critical patent/EP3745738B1/de
Publication of EP3745738A1 publication Critical patent/EP3745738A1/de
Application granted granted Critical
Publication of EP3745738B1 publication Critical patent/EP3745738B1/de
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • 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
    • H04R3/04—Circuits for transducers for correcting frequency response
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
    • H04R7/00—Diaphragms for electromechanical transducers; Cones
    • H04R7/02—Diaphragms for electromechanical transducers; Cones characterised by the construction
    • H04R7/04—Plane diaphragms
    • H04R7/045—Plane diaphragms using the distributed mode principle, i.e. whereby the acoustic radiation is emanated from uniformly distributed free bending wave vibration induced in a stiff panel and not from pistonic motion
    • 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

Definitions

  • the present invention relates to an acoustic system, in particular to an acoustic system for a vehicle, which comprises a vehicle interior trim panel acting as a loud speaker membrane.
  • Standard loudspeakers are integrated into the vehicle and are coupled with an entertainment system in order to output music, telephone conversations etc.
  • the integration of the loudspeakers is a challenge for designers and, furthermore, due to limited space assigned to loudspeakers, their minimum volume impedes generating sound waves with low frequencies.
  • acoustic systems of vehicles are confronted by high temperature changes and high humidity changes in the seasons of the year, which has an influence on the quality and performance of the acoustic system and the sound created by the system.
  • an acoustic system comprising a trim part an exciter coupled to the trim part for inducing vibrations to the trim part so that the trim part emits sound, in particular sound which can be heard by humans, a sensor measuring a temperature and/or a sensor measuring humidity, and a control unit coupled to the exciter and to the sensor measuring a temperature and/or the sensor measuring humidity, the control unit being configured so as to determine control signals for the exciter depending on the measured temperature and/or humidity.
  • the acoustic system according to the invention is equipped with a tuning system allowing to tune the sound depending on the actual temperature and/or humidity. Temperature and humidity do influence the sound created by the trim part as both the trim part and the exciter are sensible to temperature and humidity. Their characteristics, in particular their mechanical properties like stiffness, are significantly changing depending on temperature and humidity.
  • the control unit receives data from at least one sensor and tunes the control signals for the exciter depending on temperature and/or humidity so that the acoustic system is insensitive, or at least less sensitive than without the control unit, to the changing environment and compensates sound imperfections based on changes in temperature and/or humidity.
  • the trim part may be a plate-shaped panel part having a rigidity.
  • the trim part mainly extends two-dimensionally and can be flat or curved and preferably has a thickness of at least 2 mm.
  • the exciter may dynamically bend or deform the trim part or may only move the whole trim part.
  • the sensor measuring temperature and/or the sensor measuring humidity are arranged so as to measure the temperature and/or humidity of the trim part and/or the exciter directly or indirectly.
  • the sensor or sensors are preferably arranged at or in or immediately adjacent to the trim part and/or the exciter.
  • An indirect measurement would, for example, use a sensor distanced from the trim trim part in order to deduct from the measured temperature/humidity of the interior of the vehicle the temperature/humidity of the trim part which could be done by using test results stored in a look-up table.
  • the sensor or sensors are arranged distanced from the trim part and/or the exciter, it will, however, be possible to determine the temperature and/or humidity of the trim part and/or the exciter by measuring methods which allow to deduce or estimate the temperature and/or humidity of the trim part and/or the exciter based on the sensed temperature/humidity at a distance therefrom.
  • the temperature may for example be determined by an infrared camera.
  • the sensor measuring temperature and/or the sensor measuring humidity are/is preferably coupled to the trim part and/or the exciter to directly sense their temperature/humidity.
  • the acoustic system according to the present invention may comprise a memory unit for storage of temperature and/or humidity dependent processing parameters. These parameters may be achieved by calibration tests. In those calibration tests, set reference signals are sent to the exciter at reference conditions, i.e. at a reference temperature and a reference humidity. The sound emitted by the trim part is sensed to determine a reference sound result. In a next step, the temperature and/or humidity are/is changed, and the sound emitted is sensed. The control signal is tuned such that the generated, emitted sound is close to or the same as the previous reference sound. The tuning parameters elaborated by the calibration are finally stored in a memory or, alternatively, an algorithm reflecting the tuning is stored in the memory.
  • the control unit may comprise a processing unit configured to process an audio input signal with processing parameters. Those processing parameters may be provided by the memory unit mentioned above.
  • the processing unit can be a digital signal processor (DSP).
  • an optional amplifier receiving an input signal from the processing unit provides an output control signal to the exciter which is different from the input signal.
  • One variant to tune the control signal comprises at least one digital phase and amplitude filter which is part of the control unit or defines the control unit and processes audio input signals to control signals for the exciter.
  • Digital phase an amplitude filters are cost-effective devices for processing signals.
  • the control unit may include an audio input signal interface via which it receives audio signals from a head unit which can be the entertainment system of a vehicle.
  • the control system may be connected to a head unit to receive audio signals therefrom or may be part of the head unit.
  • the sensor measuring temperature and/or the sensor measuring humidity can be part of an exciter module comprising the exciter or can be arranged outside the exciter module.
  • One example is to embed the sensor/sensors into the trim part in order to receive genuine data.
  • Figure 1 shows a vehicle door having a side window 10 and a trim part 12 which is directly or indirectly attached to a metal frame 14 of the door.
  • Trim part 12 defines the visible interior door panel or a part of the door panel and is a substantially plate-shaped part which can be made of plastics or composite material.
  • the visible side of the panel may be covered by a decoration layer, for example a leather skin, a wood veneer, or a plastic film or coating.
  • An acoustic system 16 comprises trim part 12, an electrically driven exciter 18 which is mechanically coupled to the rear side of the trim part either by being directly coupled to the trim part or by being indirectly coupled to the trim part via an intermediate mechanical bridge part.
  • Acoustic system 16 further comprises a control unit 20 which can be arranged outside the door, for example behind the instrument panel, and which is configured to determine and create control signals for exciter 18.
  • a temperature sensor 22 and a humidity sensor 24 are arranged within or in contact with or adjacent to trim part 12 and, preferably, also close to exciter 18.
  • the sensors 22, 24 are electrically coupled to control unit 20.
  • Figure 2 shows one embodiment of the acoustic system 16.
  • both sensors 22, 24 are arranged at, in or close to trim part 12 and/or exciter 18 as stated above.
  • sensor 22 may be an infrared sensor so the sensor 22 can be arranged distanced from the trim part 12 which still allows to directly measure the temperature of the trim part 12.
  • Control unit 20 may comprise a processing unit 26 in form of a digital signal processor which receives data from sensors 22, 24.
  • Processing unit 26 may be electrically coupled to an exterior memory 28 or may have an embedded memory 28.
  • Control unit 20 further comprises an audio input signal interface 30 receiving audio signals 31 from a head unit 32 which is also shown in Figure 1 .
  • Head unit 32 may be the entertainment system or part of the entertainment system of the vehicle. Furthermore, interface 30 is able to receive clock data 33 allowing to synchronize signals and, at the end, sound emitted from trim part 12 with signals and sound emitted from other trim parts or conventional loudspeakers.
  • Processing unit 26 is electrically or optically coupled to an amplifier 35 being able to receive input control signals from processing unit 26 and to generate output control signals to exciter 18 to which amplifier 35 is directly connected.
  • Interface 30 may be connected to an outer unit for receiving software updates or, more general, information and software 35.
  • the connection to interface 30 can be achieved via cable or via air, i.e. wireless.
  • Memory 28 contains processing parameters which are obtained during calibration of the system as explained above. Parameters may be stored in a lookup table in the memory. Alternatively or additionally, an arithmetic model could be stored in the memory 28 which allows tuning sound emitted by trim part 12 and to process signals.
  • Control unit 20 receives audio signals 31 from the head unit 32 via interface 30. Those audio signals are transmitted to processing unit 26 which also receives data from sensors 22 and 24. If the temperature and/or the humidity are different from temperature and/or humidity in the reference conditions for calibration, or if the temperature and/or the humidity values actually sensed are different from those reference values by a predefined, fixed amount, i.e. 5°C or 5% humidity, so that the acoustic sound emitted by trim part 12 would be significantly different from the sound delivered at reference conditions, processing unit 26 uses the parameters stored in memory 28 to trim and, thus, process the input signals received from interface 30 to control signals sent to amplifier 35.
  • processing unit 26 uses the parameters stored in memory 28 to trim and, thus, process the input signals received from interface 30 to control signals sent to amplifier 35.
  • control signals from processing unit 26 define an audio input signal for amplifier 35 which amends these signals in order to provide an audio output signal to exciter 18 which, finally, controls or leads to an actuation of exciter 18 and defines the control signal for exciter 18.
  • the trim part 12 may be an interior panel, for example a door panel, an instrument panel or a ceiling panel or a part of such panel.
  • An advantage of a vibrating trim part 12 that is only a part of a larger panel is that the acoustic behavior of the acoustic system can be better optimized or adapted to user preferences.
  • the trim part 12 may be configured such that it can be removed and replaced easily.
  • the emitted sound usually is between 20 Hz to 20 000 Hz.
  • control unit 20 can be embedded in one unit or can be separated and only connected by signal lines or wireless connections.
  • control unit 20 comprises numerous digital phase and amplitude filters 40, 42, 44 which do amend/process audio signals 31 received from the head unit depending on values for temperature and/or humidity received from sensors 22 and 24.
  • the control signals finally delivered by filters 40, 42, 44 are the control signals for exciter 18.
  • a combination of the embodiments according to Figures 2 and 3 may comprise a memory 28 according to Figure 2 which contains filters 40, 42 and 44.
  • filters 40, 42 and 44 may contain filters 40, 42 and 44.
  • Figures 2 and 3 show embodiments in which audio signals are generated or emitted by head unit 32 which is distanced or separated from control unit 20. However, it is possible to combine control unit 20 and head unit 32 or to embed control unit 20 into head unit 32 as shown in Figures 4 and 5 .
  • the Figure 4 embodiment is characterized by a head unit 32 which contains memory 28, processing unit 26 and amplifier 35 as explained with respect to Figure 2 .
  • Temperature and humidity sensors 22 and 24, respectively, are, as an option only, part of an exciter module 50 which comprises exciter 18.
  • Exciter module 50 can be a device which may have an own housing.
  • sensors 22 and 24 can each or both be arranged close to both exciter 18 and trim part 12 or can be arranged immediately adjacent to a trim part 12 or partly or fully embedded into trim part 12.
  • the present invention is not limited to one temperature and one humidity sensor 22 and 24, respectively. Rather, multiple sensors 22 and 24 may directly or indirectly measure the temperature and/or the humidity of trim part 12, exciter 18 or, if required, the environment, more particular the vehicle interior.
  • Operation of the acoustic system according to Figure 4 corresponds to the system according to Figure 2 apart from the fact that the audio signals received by processing unit 26 are generated and processed within head unit 32 as processing unit 26 defines part of head unit 32.
  • the embodiment according to Figure 5 substantially corresponds to the embodiment according to Figure 4 apart from temperature sensor 22 and humidity sensor 24 being arranged outside exciter module 50.
  • both sensors or one of both sensors 22, 24 can be arranged close to or partly or fully within trim part 12, respectively.
  • Trim part 12 can be a part or a portion of the dashboard, of other panel or trim parts, e.g. roof trim or roof ceiling parts. Those trim or panel parts are preferably visible from the vehicle interior.
  • the present invention is not limited to an acoustic system within the vehicle interior but can also be used at an outer side of the vehicle, e.g. for generating warning sound for pedestrians necessary for electrical vehicles.
  • sound cancelling systems for cancelling sound of a combustion engine can be provided with the acoustic system according to the present invention.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Multimedia (AREA)
  • Fittings On The Vehicle Exterior For Carrying Loads, And Devices For Holding Or Mounting Articles (AREA)
EP19177322.5A 2019-05-29 2019-05-29 Akustisches system Active EP3745738B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP19177322.5A EP3745738B1 (de) 2019-05-29 2019-05-29 Akustisches system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP19177322.5A EP3745738B1 (de) 2019-05-29 2019-05-29 Akustisches system

Publications (2)

Publication Number Publication Date
EP3745738A1 true EP3745738A1 (de) 2020-12-02
EP3745738B1 EP3745738B1 (de) 2024-10-30

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ID=66676398

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19177322.5A Active EP3745738B1 (de) 2019-05-29 2019-05-29 Akustisches system

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2025215097A1 (fr) * 2024-04-11 2025-10-16 Saint-Gobain Sekurit France Conditionnement dynamique d'une émission sonore par un vitrage de véhicule

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1147681A1 (de) 1999-01-29 2001-10-24 New Transducers Limited Plattenförmige resonante lautsprecher
US20170208405A1 (en) * 2014-07-01 2017-07-20 Thomas Gessler Programmable digital sound reproduction network

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10264355B2 (en) * 2017-06-02 2019-04-16 Apple Inc. Loudspeaker cabinet with thermal and power mitigation control effort
TWI641269B (zh) * 2017-06-07 2018-11-11 瑞昱半導體股份有限公司 音訊播放裝置及其音訊控制電路

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1147681A1 (de) 1999-01-29 2001-10-24 New Transducers Limited Plattenförmige resonante lautsprecher
EP1147681B1 (de) * 1999-01-29 2002-09-04 New Transducers Limited Plattenförmige resonante lautsprecher
US20170208405A1 (en) * 2014-07-01 2017-07-20 Thomas Gessler Programmable digital sound reproduction network

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2025215097A1 (fr) * 2024-04-11 2025-10-16 Saint-Gobain Sekurit France Conditionnement dynamique d'une émission sonore par un vitrage de véhicule
FR3161151A1 (fr) * 2024-04-11 2025-10-17 Saint-Gobain Glass France Conditionnement dynamique d’une émission sonore par un vitrage de véhicule

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