EP4548605A1 - Verfahren zum kalibrieren eines fahrzeugintegrierten binauralen 3d-audiosystems und fahrzeug - Google Patents
Verfahren zum kalibrieren eines fahrzeugintegrierten binauralen 3d-audiosystems und fahrzeugInfo
- Publication number
- EP4548605A1 EP4548605A1 EP24727750.2A EP24727750A EP4548605A1 EP 4548605 A1 EP4548605 A1 EP 4548605A1 EP 24727750 A EP24727750 A EP 24727750A EP 4548605 A1 EP4548605 A1 EP 4548605A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- location
- sound source
- vehicle
- virtual sound
- user
- 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.)
- Pending
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04S—STEREOPHONIC SYSTEMS
- H04S7/00—Indicating arrangements; Control arrangements, e.g. balance control
- H04S7/30—Control circuits for electronic adaptation of the sound field
- H04S7/302—Electronic adaptation of stereophonic sound system to listener position or orientation
-
- 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
- H04R5/00—Stereophonic arrangements
- H04R5/04—Circuit arrangements, e.g. for selective connection of amplifier inputs/outputs to loudspeakers, for loudspeaker detection, or for adaptation of settings to personal preferences or hearing impairments
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04S—STEREOPHONIC SYSTEMS
- H04S2400/00—Details of stereophonic systems covered by H04S but not provided for in its groups
- H04S2400/11—Positioning of individual sound objects, e.g. moving airplane, within a sound field
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04S—STEREOPHONIC SYSTEMS
- H04S2420/00—Techniques used stereophonic systems covered by H04S but not provided for in its groups
- H04S2420/01—Enhancing the perception of the sound image or of the spatial distribution using head related transfer functions [HRTF's] or equivalents thereof, e.g. interaural time difference [ITD] or interaural level difference [ILD]
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04S—STEREOPHONIC SYSTEMS
- H04S7/00—Indicating arrangements; Control arrangements, e.g. balance control
- H04S7/30—Control circuits for electronic adaptation of the sound field
- H04S7/305—Electronic adaptation of stereophonic audio signals to reverberation of the listening space
Definitions
- the invention relates to a method for calibrating a vehicle-integrated binaural 3D audio system according to the type defined in more detail in the preamble of claim 1 and to a vehicle with such a binaural 3D audio system.
- DE 102020 108449 A1 describes a method for providing at least one user-specific binaural sound signal for vehicle occupants, in which the user-specific HRTF is calculated based on the anatomy of the respective person.
- the anatomy of the respective person is recorded by interior cameras arranged in the vehicle in order to easily and conveniently enable an optimized audio experience using a larger number of loudspeakers.
- US 2013/0194107 A1 also describes the capture and storage of an HRTF to generate virtual 3D audio via a signal processor.
- cameras are used to capture the anatomy underlying the calculations.
- US 2018/0249271 A1 discloses a binaural audio calibration method.
- the method disclosed in the document is used to calibrate a virtual reality device to experience a virtual three-dimensional sound environment.
- the virtual reality device also takes into account a user-specific head transmission function in order to place a virtual sound source in a virtual reality environment in such a way that it is located in the virtual reality environment at exactly the same place where the user of the virtual reality device hears it.
- a virtual sound source is placed in the virtual reality environment and a sound is emitted via the virtual sound source.
- the user of the virtual reality device indicates at which location in the virtual reality environment he perceives the virtual sound source.
- vehicle interior sensors By using vehicle-integrated loudspeakers, the use of other devices such as headphones, virtual reality glasses or the like can be dispensed with.
- vehicle interior sensors can be can be used, by means of which depth information can be obtained, such as radar sensors, LiDAR sensors, ultrasonic sensors and the like.
- the location indication can also be recorded using machine vision. Camera images generated by the camera(s) can be evaluated using suitable image recognition algorithms. Depth information can also be generated using a stereo camera.
- Motion sensors can also be used as vehicle interior sensors. These include radio-based sensors in which movements are detected by changing the radio signal strength. A Wi-Fi signal, for example, can be used as a radio technology.
- the sound emitted by the virtual sound source can be varied.
- the sound can be birdsong, the whistling of a whistle, bubbling boiling water, the whistling of a kettle, the ringing of a bell or the like. It is possible for the user to specify which type of sound should be used via a human-machine interface such as a touch-sensitive display device for the control unit.
- the virtual sound source can be placed anywhere inside the vehicle.
- the virtual sound source can be located on a vehicle seat, in the trunk, on the dashboard, under the roof lining or similar. It is also possible to place the virtual sound source outside the vehicle. This allows ambient noise to be simulated depending on the direction.
- the 3D audio system or the control unit can take the influence of the vehicle structure into account so that the user perceives the corresponding noise as acoustically muffled, as if it were actually coming from outside the vehicle.
- the control unit takes into account an individual room transmission function for each loudspeaker to adapt the audio signal emitted via the respective loudspeaker to the location of the virtual sound source.
- the geometric structure of the vehicle, the materials used in the vehicle and the location of the loudspeakers in the vehicle also affect the location of the virtual sound source.
- the previously listed variables are included in a corresponding room transmission function.
- the room transmission function can, for example, be determined experimentally by the vehicle manufacturer by carrying out acoustic measurements.
- the room transmission function can also be approximated using calculation or simulation methods. Due to the different mounting positions of the individual loudspeakers on the vehicle, the room transmission function is individual for each loudspeaker. If the By using a respective room transfer function for the individual loudspeakers in the control unit, it is possible to further reduce the location difference between the presumed location of the virtual sound source and the actual location of the virtual sound source.
- Head transmission functions can be assigned to users through personal identification. For example, people can log into the vehicle using a user name or be recognized by biometric features such as a face scan, an iris scan or voice analysis. Users can also be recognized by a device they are carrying, for example by the individual MAC address or Bluetooth address of a smartphone they are carrying. Two user-specific audio signals can be output via the same pair of loudspeakers. However, it is preferable to use an individual pair of loudspeakers for each user to output the user-specific audio signal. This reduces or even eliminates the negative influence of acoustic interference on the location of the virtual sound sources.
- the control unit maintains a database in which a large number of HRTF profiles are stored, each HRTF profile being assigned a differently configured head transfer function, and the control unit selects a different HRTF profile in method step e) to change the head transfer function and/or adjusts parameters of the head transfer function used.
- the HRTF profiles included in the database or the head transfer functions underlying these profiles can be so-called standard or default functions. These standard head transfer functions can, for example, have been defined by the vehicle manufacturer for the most common application scenarios. Changing the HRTF profile thus makes it possible to adapt the head transfer function particularly quickly and easily. However, the corresponding head transfer function may not match the user's actual head transfer function sufficiently.
- Proven methods can be used to determine how the parameters of the head transfer function should be changed when carrying out the calibration steps a) to e). For example, proven optimization algorithms or algorithms based on artificial intelligence or machine learning can be used. With the help of appropriate algorithms, it is possible to recognize patterns and thus change the parameters of the head transfer function used in such a way that the location difference is reduced in the next iteration.
- a further advantageous embodiment of the method according to the invention further provides that the location difference includes the Euclidean difference between the actual location of the virtual sound source and the location assumed by the location indication.
- the location difference includes the Euclidean difference between the actual location of the virtual sound source and the location assumed by the location indication.
- the user uses a human-machine interface to tell the control unit for method step a) where the virtual sound source should be placed.
- the user can thus influence the calibration process. For example, in certain regions of the vehicle interior there may be a greater discrepancy between the assumed position of the virtual sound source and the actual position of the virtual sound source than in other regions.
- the user can then preferentially place the virtual sound source in this region of the room, so that the errors present in this region of the room can be reduced even more quickly by calibrating. This increases the efficiency of the calibration process.
- This procedure can also be carried out in an analogous manner by the control unit.
- the control unit can divide the vehicle interior into different zones and gradually place virtual sound sources in the individual zones. The control unit then determines in which zones the location difference is particularly large and then carries out an increased number of measurements in the corresponding zones.
- a further advantageous embodiment of the method according to the invention further provides that the control device outputs an acoustic, visual and/or haptic indication to the user via output means if the location of the virtual sound source presumed by the user coincides with the actual location within a tolerated deviation or, in the case of a larger deviation, the control device outputs the indication and supplements it with a location tip, wherein the location tip describes where the actual location of the virtual sound source is compared to the presumed location of the virtual sound source.
- Acoustic signals can be issued using the vehicle's loudspeakers. If the user touches the virtual sound source, the audio signal can be stopped, for example. Additionally or alternatively, an appropriate signal tone, such as a beep or a jingle, can be heard.
- an appropriate signal tone such as a beep or a jingle
- control unit adapts the location tip depending on the magnitude of the location difference.
- a different location tip is given if the user reaches far past the virtual sound source than if he hits the virtual sound source or only reaches slightly past it.
- the light pulses emitted by lighting devices can appear brighter or last longer. Acoustic notification messages can be emitted louder in this case. Other output modalities can also be used. If, for example, the user hits the virtual sound source, only a simple notification tone can be heard. However, if the user reaches past the virtual sound source, points past it or looks past it, the actual location of the virtual sound source can be illuminated and a notification message can be read out about where the virtual sound source actually is.
- the 3D audio system and the vehicle interior sensors are set up according to the invention to carry out a method described above.
- the vehicle can be any vehicle such as a car, truck, van, bus or the like. It can also be a rail vehicle, watercraft or aircraft.
- the 3D audio system comprises at least two loudspeakers for outputting the corresponding audio signal and a control unit for controlling the loudspeakers.
- Fig. 1 is a schematic plan view of a vehicle according to the invention comprising a binaural 3D audio system
- Fig. 2 is a flow chart of a method according to the invention for calibrating the 3D audio system of the vehicle shown in Fig. 1.
- FIG. 1 shows a vehicle 6 according to the invention, which has a binaural 3D audio system.
- the 3D audio system comprises at least two loudspeakers 1, which are arranged offset from one another in the vehicle 6.
- An audio signal is emitted via the loudspeakers 1, which simulates the presence of a virtual sound source 2 in the vehicle 6.
- the virtual sound source 2 is symbolized by a bell.
- the virtual sound source 2 sounds for the user 3 at a different location to the loudspeakers 1. This simulation of sound sources can be used, for example, for entertainment purposes or to inform or warn the user 3.
- the 3D audio system is controlled by a control unit 5.
- the control unit 5 can be distributed across multiple computing units or integrated into a single computing unit (not shown).
- a computing unit 5.1 is used to evaluate vehicle interior sensors 9.1, 9.2 and 9.3.
- a computing unit 5.2 is used to calculate the audio signal.
- a computing unit 5.3 forms an optional communication interface to a central computing device 14 outside the vehicle. Additional information can be obtained from the central computing device 14, in particular wirelessly.
- the control unit 5 takes into account a so-called head transmission function HRTF.
- the head transmission function HRTF depends on the body measurements of the respective user 3 and influences the directionality from which a user 3 hears a corresponding sound. If the head transmission function HRTF matches the actual head transmission function HRTF of the user 3, the virtual sound source 2 also sounds for the user 3 at the position (8) at which the 3D audio system simulates the virtual sound source 2 (4). However, if the head transmission function HRTF deviates from the user-specific head transmission function, the virtual sound source 2 also sounds at a location other than the intended one.
- the 3D audio system can be calibrated quickly, easily and reliably in order to find a head transmission function HRTF that is suitable for the user and thus improve the sound experience.
- the control unit 5 controls the loudspeakers 1 in order to place the virtual sound source 2 at a location 4.
- the location 4 can be inside or outside the vehicle 6 and can also be referred to as the actual location or the desired location.
- the control unit 5 uses a standard head transmission function HRTF, which very likely differs from the actual head transmission function of the user 3. Accordingly, the user 3 assumes that the virtual sound source 2 is at a suspected location 8.
- the user 3 then issues a location indication 7 in order to inform the vehicle 6 or the control unit 5 where he perceives the virtual sound source 2.
- a location indication 7 the user 3 can, for example, point to the suspected location 8, look in this direction or align his body in this direction.
- the vehicle interior is monitored using vehicle interior sensors 9.1, 9.2, 9.3.
- the interior camera 9.1 can be embedded in the dashboard of the vehicle 6 and aimed at the user 3.
- Other cameras not shown in detail can also be installed.
- Depth information or distance values can be determined with the help of the radar sensor 9.2 and the radio sensor system 9.3. This makes it possible to detect movements.
- the radio sensor system 9.3 can, for example, be an arrangement of several radio antennas, such as Wi-Fi antennas, which allows movements to be detected by analyzing the radio signal strength.
- the control unit 5 can determine an angle as the location difference between the location 4 and the presumed location 8.
- the virtual sound source could be at any distance on a directional line 13. This therefore only allows a comparatively rough location determination.
- the user 3 accesses the exact location where he suspects the virtual sound source 2.
- the control unit 5 can thus determine the Euclidean distance between the location 4 and the presumed location 8 as the location difference Ax. This means that there is an even more precise location difference, so that the head transfer function HRTF can be adjusted more precisely in the next calibration step.
- the location difference Ax is compared by the control unit 5 with a specified threshold value, whereupon the head transfer function HRTF used by the control unit 5 is changed until the location difference Ax is less than the specified threshold value.
- the head transfer function HRTF can be changed in various ways.
- the control unit 5 comprises a database 11 in which a large number of HRTF profiles 12 are stored. Each HRTF profile 12 is assigned an individual head transfer function HRTF. If the location difference Ax is greater than the specified threshold value, then, for example, another HRTF profile 12 can simply be loaded, i.e. activated. In addition or as an alternative, it is possible to change the parameters of the respective head transfer functions HRTF stored in the individual HRTF profiles 12.
- An HRTF profile 12 found or adapted for the respective user 3 can be linked to the user 3 and reloaded whenever the user 3 is present in the vehicle 6.
- the calibration method according to the invention therefore only needs to be carried out once for each user 3.
- New standard HRTF profiles can be obtained, for example, from the central computing device 14.
- An HRTF profile 12 configured in the vehicle 6 can also be sent to the central computing device 14 and made available there for retrieval by other vehicles.
- the vehicle 6 can have acoustic detection means 10, which can be designed as an external microphone or an internal microphone. With the help of the acoustic detection means 10, external noises and/or background noises inside the vehicle can be detected. The audio signal emitted via the loudspeakers 1 can then be adapted to said noises and/or background noises. To do this, the amplitude of the frequency components included in the corresponding noises or background noises can be specifically increased or reduced.
- the user 3 can be trained to locate the virtual sound source 2 even better. If there is a remaining location difference Ax, information messages can be issued to the user 3, which describe where the location 4 at which the control unit 5 has actually placed the virtual sound source 2 is located relative to the assumed location 8. The user 3 thus gradually learns this deviation, whereby the remaining location difference can be reduced even further or even disappears completely.
- the sequence of the method according to the invention is shown again in Figure 2 using a flow chart. The method begins in method step 201.
- method step 202 the control unit 5 checks whether an HRTF profile 12 adapted to the respective user 3 already exists. If this is the case, the method ends in method step 210 or runs in a loop. If this is not the case, method steps 203, 204, 205 and 206 are carried out. In a distributed implementation of the control unit 5, method steps 203 to 206 can be carried out on the computing unit 5.1, for example.
- the computing unit 5.1 evaluates sensor data generated by external and internal sensors of the vehicle 6. In this way, the computing unit 5.1 determines a vehicle usage context, an environmental context and a perception context.
- vehicle usage context describes, for example, whether the vehicle 6 is being used to make a journey from a starting point to a destination or is currently being cleaned or loaded. For example, during cleaning or loading, the issuing of direction-dependent warning messages is not necessary, but during a journey with the vehicle 6 it is.
- the environmental context describes, for example, whether and where there are static and/or dynamic traffic objects opposite the vehicle 6. The environmental context can also describe what type of environmental object it is, such as an emergency vehicle. Direction-dependent information messages tailored to the respective environmental objects can then be issued.
- the perception context describes, for example, how the 3D audio system is used. For example, only a reduced number of loudspeakers 1 may be available to output the audio signal because some loudspeakers 1 are already playing music.
- the computing unit 5.1 evaluates sensor data that was generated using external microphones. Accordingly, noises external to the vehicle can be determined.
- method step 206 the location indication 7 issued by the user 3 is then additionally recorded and the location difference Ax is determined from this. If the location difference Ax is too large, the head transfer function HRTF is adjusted in method step 208.
- process step 209 it is then checked whether the location difference Ax is now greater or smaller than the specified threshold value. If necessary, process steps 206 and 208 are carried out again until the location difference Ax is sufficiently small.
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Fittings On The Vehicle Exterior For Carrying Loads, And Devices For Holding Or Mounting Articles (AREA)
- Stereophonic System (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102023002174.1A DE102023002174B3 (de) | 2023-05-30 | 2023-05-30 | Verfahren zum Kalibrieren eines fahrzeugintegrierten binauralen 3D-Audiosystems und Fahrzeug |
| PCT/EP2024/063979 WO2024245831A1 (de) | 2023-05-30 | 2024-05-21 | Verfahren zum kalibrieren eines fahrzeugintegrierten binauralen 3d-audiosystems und fahrzeug |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP4548605A1 true EP4548605A1 (de) | 2025-05-07 |
Family
ID=90732418
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP24727750.2A Pending EP4548605A1 (de) | 2023-05-30 | 2024-05-21 | Verfahren zum kalibrieren eines fahrzeugintegrierten binauralen 3d-audiosystems und fahrzeug |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP4548605A1 (de) |
| CN (1) | CN121195523A (de) |
| DE (1) | DE102023002174B3 (de) |
| WO (1) | WO2024245831A1 (de) |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100641788B1 (ko) * | 2004-11-26 | 2006-11-02 | 주식회사 현대오토넷 | 차량용 에이브이 시스템의 볼륨 자동 조절 장치 및 방법 |
| JP2013157747A (ja) | 2012-01-27 | 2013-08-15 | Denso Corp | 音場制御装置及びプログラム |
| JP6553052B2 (ja) * | 2014-01-03 | 2019-07-31 | ハーマン インターナショナル インダストリーズ インコーポレイテッド | ジェスチャ相互作用式の装着可能な空間オーディオシステム |
| DE102014210215A1 (de) * | 2014-05-28 | 2015-12-03 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Ermittlung und Nutzung hörraumoptimierter Übertragungsfunktionen |
| US10817065B1 (en) * | 2015-10-06 | 2020-10-27 | Google Llc | Gesture recognition using multiple antenna |
| US10492019B2 (en) | 2017-02-27 | 2019-11-26 | International Business Machines Corporation | Binaural audio calibration |
| DE112019003962T5 (de) | 2018-08-08 | 2021-05-06 | Sony Corporation | Informationsverarbeitungsvorrichtung, informationsverarbeitungsverfahren, programm und informationsverarbeitungssystem |
| DE102020108449A1 (de) | 2020-03-26 | 2021-09-30 | Faurecia Innenraum Systeme Gmbh | Verfahren zum Bereitstellen eines benutzerspezifischen binauralen Schallsignals für einen Fahrzeuginsassen sowie Fahrzeug |
-
2023
- 2023-05-30 DE DE102023002174.1A patent/DE102023002174B3/de active Active
-
2024
- 2024-05-21 EP EP24727750.2A patent/EP4548605A1/de active Pending
- 2024-05-21 WO PCT/EP2024/063979 patent/WO2024245831A1/de not_active Ceased
- 2024-05-21 CN CN202480035352.2A patent/CN121195523A/zh active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| DE102023002174B3 (de) | 2024-05-08 |
| WO2024245831A1 (de) | 2024-12-05 |
| CN121195523A (zh) | 2025-12-23 |
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