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WO2008148841A2 - Dispositif de mesure audiologique destiné à produire des signaux de test acoustiques pour des mesures audiologiques - Google Patents

Dispositif de mesure audiologique destiné à produire des signaux de test acoustiques pour des mesures audiologiques Download PDF

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Publication number
WO2008148841A2
WO2008148841A2 PCT/EP2008/056992 EP2008056992W WO2008148841A2 WO 2008148841 A2 WO2008148841 A2 WO 2008148841A2 EP 2008056992 W EP2008056992 W EP 2008056992W WO 2008148841 A2 WO2008148841 A2 WO 2008148841A2
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WO
WIPO (PCT)
Prior art keywords
measuring
measuring position
room
acoustic
signals
Prior art date
Application number
PCT/EP2008/056992
Other languages
German (de)
English (en)
Other versions
WO2008148841A3 (fr
Inventor
Alexandra Müller
Thomas Brand
Markus Kallinger
Alfred Mertins
Birger Kollmeier
Original Assignee
Carl Von Ossietzky Universität Oldenburg
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 Carl Von Ossietzky Universität Oldenburg filed Critical Carl Von Ossietzky Universität Oldenburg
Publication of WO2008148841A2 publication Critical patent/WO2008148841A2/fr
Publication of WO2008148841A3 publication Critical patent/WO2008148841A3/fr

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Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/12—Audiometering
    • A61B5/121—Audiometering evaluating hearing capacity
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/16—Devices for psychotechnics; Testing reaction times ; Devices for evaluating the psychological state

Definitions

  • Audiological measuring device for generating acoustic test signals for audiological measurements
  • the invention relates to an audiological measuring device for generating acoustic test signals for audiological measurements and to a corresponding method for generating acoustic test signals for audiological measurements.
  • the invention is in the field of audiology, which is a branch of medicine and deals with all aspects of auditory perception and hearing.
  • the invention enables the provision of test signals for audiological measurements.
  • audio-logical measurements are understood as any measurements with which the auditory perception or the hearing of living beings is researched or with which the functioning of hearing aids in the case of persons with hearing loss is checked or adjusted.
  • audiological measurements for example, hearing tests are to be understood, which preferably take place in accordance with prescribed standards.
  • Audio logical measurements also include measurements to determine speech intelligibility or psychophysical tests for localization perception of test signals in reflection-prone or reflection-poor environment.
  • room loudspeakers In the field of hearing aid acoustics, it is desirable that audio logical measurements for persons with hearing aids be carried out via room loudspeakers.
  • Spaces speakers are understood here and below loudspeakers, which do not deliver the sound directly and directly to the ear of test persons, as is the case with headphones.
  • Room loudspeakers thus relate in particular to all types of loudspeakers with the exception of headphones.
  • the use of room loudspeakers in the hearing aid acoustics is necessary in particular because electroacoustic feedback from loudspeakers placed directly on the patient's ear should be avoided with the hearing aids.
  • the object of the invention is therefore to provide an audio logical measuring device, with the simple and inexpensive audiological measurements can be performed with the help of room speakers.
  • the audiological measuring device serves to generate acoustic test signals, wherein these test signals are predetermined signals which generate a predetermined acoustic perception and which can be composed of several acoustic signals.
  • the audiological measuring device includes a spatial loudspeaker arrangement for providing at least two acoustic signals at at least two measuring positions comprising a first measuring position and a second measuring position.
  • the first and the second measuring position are preferably selected such that they correspond to the distance between the ears of a test object, in particular a test person.
  • the audio logical measuring device further comprises a per se known means for generating in a first acoustic signal and a second acoustic signal convertible control signals, by providing only the first acoustic signal at the first measuring position and of only the second acoustic signal the second measuring position, a predetermined acoustic test signal can be generated.
  • This generating means thus generates signals in which, in the case of a non-existing crosstalk, the desired test signal is generated.
  • Crosstalk here means a sound transmission of the first acoustic signal to the second measuring position or of the second acoustic signal to the first measuring position.
  • crosstalk compensation device is used in the device according to the invention, which compensates crosstalk between the at least two acoustic signals of the room speaker arrangement by appropriate computer-aided processing of the control signals generated by the generating means.
  • the crosstalk compensation device thus processes the control signals and supplies them to the spatial loudspeaker arrangement for providing the at least two acoustic signals such that the predefined test signal which corresponds to the test signal which would be present without crosstalk is generated by the spatial loudspeaker arrangement at the first and second measurement positions.
  • the implementation of crosstalk compensation is known per se from the prior art.
  • the essence of the invention is the use of the known crosstalk compensation in an audio logical measuring device for audio logical measurements.
  • Such use of crosstalk compensation in the field of audio logics is still unknown.
  • headphones are used in the field of audio technology for corresponding measurements either, which, however, are disadvantageous in the hearing aid acoustics, or measurements are carried out with room speakers in elaborate soundproofed rooms.
  • the device according to the invention thus has the advantage that audiological measurements can be carried out with the aid of room loudspeakers with the aid of crosstalk compensation in arbitrary rooms. Elaborate room equipment to reduce the Schallrefiexion can be dispensed with. In addition, any test signals can be virtually generated with the device without having to change the spatial speaker arrangement in position. The audiological measurements are thus much simpler than in the prior art.
  • the position of the Jardinlautspre- cheran extract and / or the at least two measuring positions can be fixed.
  • the test object when using the audio logical measuring device, the test object is ject always at the predetermined measuring positions with respect to the speaker assembly position.
  • the same parameters can always be used in the crosstalk compensation, whereby the implementation of the crosstalk compensation becomes very simple.
  • the position of the spatial loudspeaker arrangement or the at least two measuring positions in the device it is also possible for the position of the spatial loudspeaker arrangement or the at least two measuring positions in the device to be varied. In this case, the parameters for the crosstalk compensation must be adjusted according to the respective set positions.
  • the spatial loudspeaker arrangement is realized in a simple manner by providing a plurality of room loudspeakers, wherein at least two room loudspeakers in the form of a first and a second room loudspeaker are provided, which generate the at least two acoustic signals.
  • the inventors have been able to determine that, when setting certain distance ranges with respect to the room loudspeakers or the measuring positions, audio logical measurements can be carried out which essentially always deliver the same test signals in any surroundings.
  • audiological measuring device the following arrangements are advantageous for the audiological measuring device:
  • the first and the second room loudspeakers are arranged or arrangeable in relation to the first and second measuring positions in such a way that the connection line between the first room loudspeaker and the first measuring position and the connecting line between the second room loudspeaker and the second measuring position an angle of substantially 30 ° or less, in particular of 20 ° or less is clamped.
  • the first and second room loudspeakers are arranged or arrangeable such that the connecting line between the first and second measuring positions is substantially parallel to the connecting line between the first and second room loudspeakers.
  • the connecting line between the first and second measuring positions preferably has a distance to the connecting line between the first and the second spatial loudspeakers of between 0.5 m to 1.5 m, in particular between 0.8 m and 1.2 m, and particularly preferably substantially 1.0 m up.
  • test signals can preferably be achieved by varying the control signals, depending on the audiological tests performed.
  • a user interface is provided, via which parameters of the audiological measurement can be entered by a user, in particular the test signals to be generated and / or the positions of the room loudspeakers and / or the measurement positions.
  • measured values acquired during the measurement can also be entered via the user interface, the input measured values being evaluated in particular in an evaluation unit and the evaluations output at the user interface.
  • the erfmdungswashe device can be used for any tests.
  • acoustic test signals for performing hearing tests can be generated with the device.
  • the device can be used to generate test signals for measuring speech intelligibility and / or for performing localization perception tests and their changes.
  • test signals for adapting generating and / or checking hearing aids.
  • Hearing aids in addition to conventional hearing aids, also other hearing aids, such as cochlear implants or implantable hearing aids to understand.
  • a test signal can be generated which contains an interference signal which is perceived by a test person from the front or from the side.
  • the crosstalk compensation device used in the device according to the invention is preferably designed such that it performs crosstalk compensation on the basis of the impulse responses at the first and second measurement positions in response to the at least two acoustic signals provided by the spatial loudspeaker arrangement.
  • the device according to the invention contains a measuring device, in particular in the form of microphones which can be arranged at the first and second measuring positions, wherein the impulse responses can be measured with the measuring device.
  • a particularly good overcompensation is achieved.
  • the inventors have been able to demonstrate that impulse responses in crosstalk compensation, which do not exactly take into account the present room acoustics, can also be used, in particular in the case of a close arrangement of the room loudspeakers.
  • the device according to the invention is preferably designed in such a way that the overcompensation device can access a database, wherein the database stores impulse responses which are used by the crosstalk compensation device and / or from which those used by the crosstalk compensation device Pulse arrangement calculated / synthesized become.
  • the crosstalk compensation device uses impulse responses in the time domain.
  • the invention further relates to a method for generating acoustic test signals for audiological measurements with the aid of the device according to the invention, comprising the following steps:
  • a room loudspeaker arrangement for providing at least two acoustic signals at at least two measuring positions comprising a first measuring position and a second measuring position; Generating control signals that can be converted into a first acoustic signal and a second acoustic signal, wherein a predetermined acoustic test signal can be generated by providing only the first acoustic signal at the first measuring position and only the second acoustic signal at the second measuring position; - Performing a crosstalk compensation, in which the control signals are processed in such a way and the spatial loudspeaker arrangement for providing the at least two acoustic signals are supplied such that at the first and second measuring position, the predetermined test signal is generated by the Jardinlaut Anlageneranssen.
  • the room loudspeaker arrangement is set up in the free field so that measurements can be performed in the free field with the generated test signals. It is also possible that the room speaker arrangement is placed in a room.
  • the spatial loudspeaker arrangement and the at least two measuring positions are preferably arranged in the space such that the distance between the first measuring position to the loudspeaker arrangement and / or the second measuring position to the spatial loudspeaker arrangement is less than the distance between the measuring positions and / or the spatial loudspeaker arrangement to the room walls.
  • the acoustic test signals generated by the device are substantially independent of the room acoustics present.
  • Fig. 1 is a schematic representation showing the components used in one embodiment of the device according to the invention.
  • FIG. 2 shows a schematic representation of the implementation of the crosstalk compensation according to an embodiment of the invention
  • FIG. 3 shows a schematic representation of the performance of a speech intelligibility test with the aid of an embodiment of the device according to the invention.
  • FIG. 1 shows schematically the essential components of an embodiment of the inventive audio logical measuring device.
  • a square space R is shown in plan view in which an audiological measurement is to be performed on a subject T, wherein the subject with the nose and the two ears is shown schematically by the subject T.
  • the ears correspond to the measurement positions Ml and M2.
  • the left ear is at the measuring position M1 and the right ear is at the measuring position M2.
  • a loudspeaker arrangement consisting of two loudspeakers 1 and 2 is arranged in front of the face of the subject T.
  • FIG. 1 shows the individual spacings of the loudspeakers 1 and 2 and the measuring positions M1 and M2, respectively.
  • the distance dl denotes the distance between the two speakers 1 and 2, this distance being along the line Ll extends.
  • the connecting line L2 between the measuring positions M1 and M2 is parallel to the line L1, and the distance along this line between the measuring positions M1 and M2 (ie, the ear distance of the subject) is indicated as d2.
  • the distance between the parallel lines L1 and L2 is designated as d3.
  • the device according to FIG. 1 has the advantage that it is possible to dispense with the arrangement of headphones directly at the ears of the subject T by the use of two room loudspeakers 1, 2. This is particularly advantageous in tests with persons who wear hearing aids, as this disturbing interactions between the headphone speakers and the components of the hearing aid are avoided.
  • the audiological apparatus comprises a processing unit 3, which in turn consists of the units 4 and 5.
  • the unit 4 in this case represents a signal generating device, with the corresponding electrical control signals can be generated, which can be converted by transducers in the form of any two speakers in two audio signals.
  • the signal generator 4 is implemented as software or hardware or as a combination of software and hardware and allows the generation of a plurality of test signals, which can be used in audiological tests.
  • the device 4 thus stores a plurality of possible audio logical tests with corresponding test signals, and a user performing corresponding tests can call and execute corresponding programs for generating the signals for the respective tests.
  • a user interface connected to the processing unit 3 is provided, which is indicated schematically in FIG. 1 by a monitor 7 and a keyboard 8.
  • control signals are generated which generate desired test signals when outputting via a headphone to the test person T.
  • the device 4 can simulate test signals that the test person as Perceives signals originating from predetermined spatial directions. In order to maintain the spatial impression of such test signals in the device according to the invention when using room loudspeakers, it is necessary to prevent the crosstalk which would occur if the signals generated in the device 4 were output directly to the loudspeakers 1 and 2. This crosstalk occurs because the sound from the speakers 1 and 2 can now overlap and thus sound signals from speaker 1 to the measuring position M2 and sound signals from speaker 2 reach the measuring position Ml.
  • a so-called crosstalk compensation device 5 is used in the device according to FIG. 1 as a further component, which performs a crosstalk compensation on the control signals which are generated by the signal generating device 4.
  • the signals from the device 4 are compensated for and equalized, so that the signals generated by the crosstalk compensation are configured after their sound conversion at the loudspeakers 1 and 2 in such a way that the crosstalk between the acoustic signals of the loudspeakers 1 and 2 is prevented and thus the same perceptible test signal is generated by the room speakers, as if the subject T would wear a headphone.
  • any algorithms known in the art may be used. Examples of such algorithms are mentioned in references [1] to [8]. Preferably algorithms are used in particular, which are specified in the publications [1], [2] or [8].
  • impulse responses at the measurement positions Ml and M2 needed namely the answers to these measurement positions on emitted sound pulses from both the speaker 1 and the speaker 2.
  • These impulse responses are equalized in the Matter Kunststoffpensations heard 5.
  • synthesized impulse responses are used, which are read from a database 6.
  • Such a database can be found, for example, at the Internet address http://interface.cipic.ucdavis.edu/CIL_html/CIL_HRTF_data_base.htm.
  • the impulse responses in the database do not reflect the room acoustics of the room R, since they were determined in other rooms. However, it has been shown that despite these different spatial characteristics, the crosstalk compensation still works very well and provides the desired test signals. Nevertheless, actually measured impulse responses can be used in the inventive device in the crosstalk compensation, which reflect the actual existing room acoustics R.
  • a measuring device (not shown) is preferably provided, which has two probe microphones, which are arranged at the measuring positions M1 and M2. These probes then measure corresponding pulses from the loudspeakers 1 and 2, respectively, and these measured pulses are then stored and used by the crosstalk compensation device.
  • the user When using a database from which the impulse responses are read out, the user also uses the user interface 7, 8 to input the individual spatial arrangements of the loudspeakers relative to one another and the measurement positions relative to each other and to the loudspeakers, so that suitable impulse responses can then be retrieved from the database similar or identical arrangements can be read.
  • control signals which are generated by the device 4, processed by a known crosstalk compensation such that a corresponding test signal is not provided via headphones, but via room speakers.
  • the crosstalk compensation two control signals Sl and S2 are processed, these signals generate the test signal, which when using a headset at the measuring positions Ml and M2 is produced. These signals are now supplied to a corresponding filter matrix with the entries Hn, H21, H12 and H22.
  • the filter matrix is dependent on the selected crosstalk compensation algorithm.
  • the space transfer matrix C which reproduces the acoustic properties of the room and the arrangement of the loudspeakers 1 and 2 in the room, flows into the filter matrix.
  • the entries of the matrix Cn, C 21 , C 12 and C22 between the loudspeakers 1, 2 and the subject T are shown in FIG. Nevertheless, the entries of the matrix flow in before the actual acoustic output when performing the crosstalk compensation.
  • the entries of the matrix C contain the measured or synthesized impulse responses.
  • the entry Cn corresponding to the impulse response at the measurement position Ml for one pulse of the speaker 1.
  • the entry C 21 represents an impulse response at the measured response M2 1 for a pulse of the speaker of the entry C 12 corresponds to the impulse response at the measurement position Ml for a pulse of the loudspeaker 2 and the entry C 22 represents the impulse response at the measuring position M2 for a pulse of the loudspeaker 2.
  • corresponding acoustic signals x 1 and x 2 are reproduced, which together form the test signal which gives the corresponding spatial impression. which would be achieved by the original signals Sl and S2 without crosstalk compensation, ie when the sound signal from the speaker 1 only to the Measuring position M1 arrives and the sound signal from the speaker 2 only reaches the measuring position M2.
  • FIG. 3 shows schematically a measuring arrangement in which the device according to the invention can be used.
  • FIG. 3 shows preferred positions for the two loudspeakers 1 and 2 and the measuring positions M1 and M2.
  • the distance between M1 and M2 corresponds to the distance between the ears of the subject T.
  • ILD intelligence level difference
  • a test person is first presented with a first test signal in which a useful signal in the form of a spoken text and a noise signal in the form of a noise frontally, ie at zero degree angle according to the scale shown in Fig. 3, is presented.
  • a second test signal is subsequently generated, which is shown schematically by dot-dashed loudspeakers at the positions So or N x .
  • the second test signal a perception is generated in the person T such that the useful signal again acts frontally on the user, whereas the interference signal now passes from the direction + 90 ° to the right ear of the subject T.
  • Such virtual arrangements of useful and interference signals can be simulated according to the invention without problems due to the performance of the crosstalk compensation.
  • the threshold (as signal-to-noise ratio in db) of speech intelligibility of 50% is determined both for the first test signal and for the second test signal.
  • the difference between the two thresholds corresponds to the ILD difference.
  • the inventors were able to show that with the device according to the invention with crosstalk compensation ILD differences are approached, which come close to the ILD differences in measurements performed with headphones.
  • the inventive device thus has the further advantage that ILD measurements can now be performed in any room with two room speakers, which was previously not possible with a corresponding real arrangement of the room speakers.
  • ILD measurements can now be performed in any room with two room speakers, which was previously not possible with a corresponding real arrangement of the room speakers.
  • the possibility is created to make hearing tests or adjustments and adjustments of hearing aids, without the need for special low-noise rooms to reduce the sound reflections would be required. Audio logical measurements can thus be made with two room speakers even in small rooms without special electro-acoustic equipment with the help of crosstalk compensation.

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Abstract

L'invention concerne un dispositif de mesure audiologique destiné à produire des signaux de test acoustiques pour des mesures audiologiques, comportant un dispositif de haut-parleur spatial (1, 2) destiné à émettre au moins deux signaux acoustiques dans au moins deux positions de mesure, c.-à-d. une première position de mesure (M1) et une deuxième position de mesure (M2); un élément (4) de production de signaux de commande (S1, S2) pouvant être convertis en un premier signal acoustique et un deuxième signal acoustique, un signal de test acoustique prédéfini pouvant être produit par émission exclusive du premier signal acoustique dans la première position de mesure (M1), et du deuxième signal acoustique dans la deuxième position de mesure (M2); et un dispositif de compensation de diaphonie qui, en fonctionnement, traite les signaux de commande (S1, S2) et les achemine vers le dispositif de haut-parleur spatial (1, 2) de telle manière que le signal de test prédéfini est produit dans la première et la deuxième position de mesure (M1, M2).
PCT/EP2008/056992 2007-06-05 2008-06-05 Dispositif de mesure audiologique destiné à produire des signaux de test acoustiques pour des mesures audiologiques WO2008148841A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102007026219A DE102007026219A1 (de) 2007-06-05 2007-06-05 Audiologische Messvorrichtung zur Erzeugung von akustischen Testsignalen für audiologische Messungen
DE102007026219.3 2007-06-05

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WO2008148841A2 true WO2008148841A2 (fr) 2008-12-11
WO2008148841A3 WO2008148841A3 (fr) 2009-04-16

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109044377A (zh) * 2018-09-13 2018-12-21 尹志军 一种注意力测试装置及心理测试设备

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* Cited by examiner, † Cited by third party
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US3236949A (en) 1962-11-19 1966-02-22 Bell Telephone Labor Inc Apparent sound source translator
US4893342A (en) * 1987-10-15 1990-01-09 Cooper Duane H Head diffraction compensated stereo system
US6078669A (en) * 1997-07-14 2000-06-20 Euphonics, Incorporated Audio spatial localization apparatus and methods
GB9805534D0 (en) * 1998-03-17 1998-05-13 Central Research Lab Ltd A method of improving 3d sound reproduction
WO2007039649A2 (fr) * 2006-12-13 2007-04-12 Phonak Ag Fourniture de services de soins medicaux auditifs a l'aide d'un dispositif de divertissement domestique

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109044377A (zh) * 2018-09-13 2018-12-21 尹志军 一种注意力测试装置及心理测试设备
CN109044377B (zh) * 2018-09-13 2021-06-18 尹志军 一种注意力测试装置及心理测试设备

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DE102007026219A1 (de) 2008-12-18

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