EP3337189A1 - Procédé de détermination de direction d'une source de signal - Google Patents

Procédé de détermination de direction d'une source de signal Download PDF

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Publication number
EP3337189A1
EP3337189A1 EP17201681.8A EP17201681A EP3337189A1 EP 3337189 A1 EP3337189 A1 EP 3337189A1 EP 17201681 A EP17201681 A EP 17201681A EP 3337189 A1 EP3337189 A1 EP 3337189A1
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EP
European Patent Office
Prior art keywords
signal
characteristic
input
directional
central angle
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Withdrawn
Application number
EP17201681.8A
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German (de)
English (en)
Inventor
Homayoun KAMKAR-PARSI
Marko Lugger
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.)
Sivantos Pte Ltd
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Sivantos Pte Ltd
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Filing date
Publication date
Application filed by Sivantos Pte Ltd filed Critical Sivantos Pte Ltd
Publication of EP3337189A1 publication Critical patent/EP3337189A1/fr
Withdrawn legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
    • H04R25/00—Electric hearing aids
    • H04R25/43—Electronic input selection or mixing based on input signal analysis, e.g. mixing or selection between microphone and telecoil or between microphones with different directivity characteristics
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
    • H04R25/00—Electric hearing aids
    • H04R25/40—Arrangements for obtaining a desired directivity characteristic
    • H04R25/405—Arrangements for obtaining a desired directivity characteristic by combining a plurality of transducers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
    • H04R25/00—Electric hearing aids
    • H04R25/40—Arrangements for obtaining a desired directivity characteristic
    • H04R25/407—Circuits for combining signals of a plurality of transducers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
    • H04R25/00—Electric hearing aids
    • H04R25/55—Electric hearing aids using an external connection, either wireless or wired
    • H04R25/552—Binaural
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
    • H04R2430/00—Signal processing covered by H04R, not provided for in its groups
    • H04R2430/20—Processing of the output signals of the acoustic transducers of an array for obtaining a desired directivity characteristic
    • H04R2430/23—Direction finding using a sum-delay beam-former

Definitions

  • the invention relates to a method for determining at least one direction of a useful signal source by an acoustic system comprising at least a first input transducer and a second input transducer, wherein the first input transducer from a sound signal of the environment generates a first input signal and the second input transducer from the sound signal a second Input signal generated.
  • the algorithms which are used for user-specific amplification and more generally for sound adaptation to input signals of the hearing aid which are obtained from the ambient sound are often to be selected as a function of a respective hearing situation.
  • the individual listening situations are given as frequently recurring patterns of superimpositions of a useful signal sound due to noise or noise in general, the pattern u. a. be typified by the type of noise occurring, the signal-to-noise ratio, the frequency response of the useful signal sound as well as temporal variations and averages of the sizes mentioned.
  • the signal-to-noise ratio in the input signals can be improved in an efficient and resource-conserving manner, since in this case a reduction of the noise is achieved by means of its statistically predictable properties as part of typing as a hearing situation.
  • binaural hearing aids Currently known in binaural hearing aids is a localization of useful signal sources via a measurement of the transit time difference, which results from the different propagation times of a sound signal to the respective hearing aids worn on both ears of the user of the binaural hearing device.
  • a measurement requires on the one hand a high computational effort, on the other hand the fastest possible yet detailed transmission of the signal components from a hearing aid to the other hearing aid for evaluation. Both requirements have a negative effect on the energy consumption of the hearing aids.
  • the invention is therefore based on the object for an acoustic system to specify a method which locates a useful signal source with the least possible calculation and system complexity as accurately as possible.
  • a method for determining at least one direction of a useful signal source by an acoustic system comprising at least a first input transducer and a second input transducer, wherein the first input transducer from a sound signal of the environment generates a first input signal and the second input transducer generates a second input signal to the sound signal, the first input transducer from a sound signal of the environment generates a first input signal and the second input transducer from the sound signal generates a second input signal, wherein based on the first input signal and the second input signal, a plurality of angle-dependent directional characteristics with a given each Central angle and a respective same angular expansion are formed, wherein the signal components to the individual directivity to the presence of a useful signal from a Nutzsignalq uelle are examined, and wherein a determined in a specific directional characteristic Nutzsignalán the corresponding central angle is assigned as the direction of the useful signal source.
  • an acousto-electrical converter is generally understood to include an input transducer which generates an electrical signal from a sound signal, that is to say in particular also a microphone.
  • the individual directional characteristics each have a minimum or in each case a maximum of the sensitivity with respect to a test signal from the corresponding angular direction at their respective central angle.
  • Directional characteristics include, in particular, directional cones which have the greatest sensitivity in the direction of their respective central angle, the sensitivity decreasing with increasing angular distance from the central angle. The degree of decrease of the sensitivity with increasing angular distance from the central angle can be taken in this case as a measure of the angular expansion of the directional characteristic.
  • the individual directivity characteristics may each also have a minimum sensitivity at the respective central angle with respect to a given test signal, whereby the sensitivity with respect to the test signal increases with increasing angular distance from the central angle.
  • the degree of increase in sensitivity with increasing angular distance from the central angle can then be used as a measure of the angular expansion.
  • the central angle of each two adjacent directional characteristics at a fixed angular distance from each other. This means that a kind of scan of an angular range is carried out by means of the individual directional characteristics, wherein in the case of a transition from a directional characteristic to its adjacent directivity, the central angle changes in each case by a constant amount.
  • the investigation of the signal components, including the presence of a useful signal, from a useful signal source can in particular in the individual directional characteristics based on the signal level or on the basis of one or more variables derived from the signal level.
  • the assignment of a central angle of a directional characteristic as the direction of a useful signal source determined in the corresponding directional characteristic now has the advantage that the useful signal source can be localized in the presence of other useful signal sources, for example, if a new, further useful signal source to an already existing useful signal source with a corresponding useful signal addition, which is spatially separated from the first, already existing useful signal source.
  • the detection or localization of the individual useful signal sources is in this case not affected by the presence of other useful signal sources, as it might occur in a localization via a phase measurement, where each further useful signal source at least as a noise deteriorates the signal-to-noise ratio, and thus could affect the robustness and also the angular resolution of the localization.
  • the direction of the useful signal source determined as a result of the method can be used in particular for aligning a directional cone during the input conversion of the acoustic system to the useful signal source in order to improve the signal-to-noise ratio of the useful signal source relative to the background noise by means of the directional cone.
  • An angular distance between two directivity characteristics adjacent to their central angle preferably corresponds to half the angular expansion.
  • both adjacent directional characteristics have the same angular expansion.
  • the individual directional characteristics are formed by directional cone whose sensitivity in the direction of the central angle is maximum, and decreases with increasing angular distance from the central angle, this means in particular that for each individual directional characteristic, an angle can be given for which the sensitivity of a test signal has dropped by a certain factor from the maximum value at the central angle, for example 6 dB or 10 dB.
  • Such an angle is now assigned to the corresponding directional characteristic as a half angle widening, and the central angle of the adjacent directional characteristic is selected correspondingly at an angular distance of half an angular expansion.
  • the central angle and the angular expansion of the directional characteristic are favorably determined by at least two conditions for the individual directional characteristics.
  • the directional characteristics can each be formed according to the "linearily constrained minimum variance" method on the basis of the conditions. This makes it possible to align the conditions, for example in the form of relative attenuation of the sensitivity in a certain angular direction, and to be able to directly form the respective directivity characteristics.
  • the individual directional characteristics are respectively predetermined by a notch-shaped sensitivity characteristic which is determined by at least two conditions, so that the central angle and the angular expansion of the sensitivity characteristic are determined by the at least two conditions.
  • a notch-shaped sensitivity characteristic is here to understand a directional characteristic, which has the maximum attenuation of sensitivity with respect to a test signal of given volume at the central angle, the sensitivity increasing with increasing angular distance from the central angle. The degree of this increase in sensitivity as a function of the angular distance to the central angle then defines the angle widening.
  • the signal components of the useful signal are substantially attenuated by the directional characteristic, while signal components of other useful signal sources, which are outside the angular expansion about the central angle of said directional characteristic, largely maintained. This can now be used to determine a presence of a useful signal source in the region of the corresponding directional characteristic.
  • an acoustic characteristic variable is formed from the signal components in each case for the individual directional characteristics, the acoustic characteristics of the directional characteristics being used to determine a useful signal in at least one of the directional characteristics.
  • the maximum signal level over a suitable time window or the signal level averaged over the time window can be used as an acoustic parameter, and in particular only signal components in specific frequency bands can be used for the formation of the acoustic parameter.
  • the acoustic characteristic of the directional characteristic is compared with the total value of the corresponding characteristic for the first input signal and / or the second input signal, thereby forming a relative characteristic for the directional characteristic, wherein the presence of a useful signal in at least one of the relative characteristics of the directional characteristics the directional characteristics is determined.
  • the acoustic characteristic for example a time-averaged signal level, is first formed for the individual directional characteristics, and then the acoustic characteristic of each directional characteristic is normalized via a corresponding parameter which is derived from the first input signal and / or the second input signal.
  • the relative characteristic is then formed for each directional characteristic, which is ultimately used as a measure of the presence of a useful signal in the directional characteristic.
  • the reference level of the first input signal or the second input signal or the overall level of the first input signal and the second input signal can be used.
  • the relative parameters are preferably compared with each other and / or with a predetermined limit value, and from this the presence of a useful signal in at least one of the directional characteristics is determined.
  • the comparison of the relative characteristics with one another proves to be advantageous in that, depending on the nature of the directional characteristics, an extreme value (maximum or minimum) of a relative parameter can be used to directly deduce the presence of a useful signal in the corresponding directional characteristic.
  • an extreme value (maximum or minimum) of a relative parameter can be used to directly deduce the presence of a useful signal in the corresponding directional characteristic.
  • a temporal mean value of the signal level is used as the characteristic variable, and from an attenuation, which experiences the temporal mean value of the signal level in a directional characteristic, standardized over the temporal mean value of the total level, by the respective sensitivity characteristic, the presence of a Useful signal is determined in the directional characteristics.
  • the time window for averaging can depend in particular on the expected nature of the useful signal sources. If, for example, at least one of the useful signal sources is a conversation partner, then so the time window is preferably to be selected so that certain frequency ranges, eg format frequencies, are sufficiently strongly excited.
  • a further input transducer generates a further input signal from the sound signal, wherein the directional characteristics are formed on the basis of the first input signal, the second input signal and the further input signal.
  • the further input transducer is spatially separated from the first input transducer and the second input transducer.
  • the individual directional characteristics are in each case given by a plurality of conditions which is equal to the number of input signals, so that at least the central angle and the angular widening are determined by the plurality of conditions.
  • the individual directional characteristics can be determined in each case by up to four conditions. This makes it possible to achieve particularly narrow angular widening and thus a particularly high angular resolution.
  • the invention further provides an acoustic system, comprising at least a first input transducer for generating a first input signal from a sound signal of the environment, a second input transducer, a second input transducer for generating a second input signal from the sound signal, and a signal processing unit, which for carrying out the method described above is set up.
  • the acoustic system is designed as a hearing aid.
  • FIG. 1 is shown schematically in a plan view of a listening situation 1.
  • a user 2 of an acoustic system 4 which is embodied in the present case as a binaural hearing aid, is located in the left-hand representation of FIG. 1 in a conversation with a first conversation partner 6, which is positioned frontally to the user 2 with respect to its viewing direction, ie in FIG is an angle of 0 degrees to the user 2.
  • the binaural hearing aid has localized the position of the interlocutor 6 for this hearing situation 1 as part of its resolution options.
  • a second conversation partner 8 is added, resulting in a new hearing situation 1 '.
  • the second party 8 is positioned approximately at an angle of -45 degrees with respect to the viewing direction of the user 2.
  • FIG. 2 is a block diagram of the flow of a method 10 for determining a direction of a useful signal source by an acoustic system 4 is shown.
  • the useful signal source is given by the first call partner 6 or the second call partner 8 in one of the two listening situations 1, 1 ' FIG. 1
  • the acoustic system 4 is formed in the present case by a binaural hearing aid.
  • the binaural hearing device comprises a first local unit 12 and a second local unit 14, which are to be worn in the intended use of the binaural hearing device by the user 2 respectively on the left and on the right ear.
  • the first local unit 12 or the second local unit 14 has a first input transducer 16 and a second input transducer 18, respectively, which generates a first input signal 20 and a second input signal 22 from an incoming sound signal of the environment.
  • the first input transducer 16 and the second input transducer 18 are each given in the present case by a microphone. Possibly. can also be provided another input transducer 19, which generates a further input signal 23.
  • a first filter parameter F1 (aj) and a second filter parameter F2 For a plurality of central angles aj, which cover the front hemisphere of the user 2 starting from 0 degrees in steps of 15 degrees in both directions, a first filter parameter F1 (aj) and a second filter parameter F2 (FIG. aj).
  • the first filter parameter F1 (aj) and the second filter parameter F2 (aj) are designed such that they form a notch-shaped one with a convolution with the first input signal 20 and the second input signal 22, respectively, in a manner to be described Sensitivity characteristic 24 form.
  • the sum of the resulting signals for signal components whose signal source points in the direction of the central angle aj of the sensitivity characteristic 24 has a much lower sensitivity than for signals whose signal source is in another direction.
  • an acoustic characteristic 28 is now formed by averaging the signal level of the resulting signal 26 over a predetermined time interval.
  • the acoustic parameter 28 formed from the averaged signal level is normalized via a reference level 30, and thus a relative characteristic 32 is formed.
  • the reference level 30 is given in the present case by a time average of the level of the first input signal 16.
  • a time average of the total level ie the level of the sum of the first input signal 16 and the second input signal 18, are used.
  • the relative core sizes 32 thus formed at each central angle aj are now compared with each other.
  • each center angle aj whose sensitivity characteristic 24 has the relative characteristic 32 with the lowest value is now defined as the direction of a useful signal source.
  • the directional characteristic is formed by a sensitivity characteristic 24 whose central angle aj is defined by the direction with the lowest sensitivity.
  • LCMV linearly constrained minimum variants
  • the central angle aj and the widening ⁇ can each be defined by a given attenuation of the signal components at the central angle aj itself and at another angle.
  • the angular spread ⁇ is determined by attenuating the signal level by 20 dB at a central angle aj of -10 degrees and attenuating the signal level by 6 dB in the frontal direction, ie at 0 degrees.
  • a notch-shaped sensitivity characteristic 24 is defined, which for signals whose Source is in the range of the central angle aj, has a significantly lower sensitivity, and suppressed such signals accordingly.
  • acoustic characteristic 28 to the present signal source of all angle-dependent sensitivity characteristics 24 the lowest possible value.
  • the acoustic characteristic 28 thus obtained is then normalized over the time-average overall level or the time-averaged level of one of the two input signals 20, 22.
  • FIG. 4 are shown against a time axis t to three different central angles respectively the relative characteristics 32a to 32c, which the in FIG. 2 Hearing situations 1, 1 'are assigned.
  • a time of about 4.5 seconds the user 2 is only in conversation with the first party 6.
  • the relative characteristics 32a through 32c which are prescribed for sensitivity characteristics with central angles of -30 degrees (32a), -45 degrees (32b) and -60 degrees (32c) are formed, logically have no evidence for a useful signal source in the corresponding angular range.

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  • Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Neurosurgery (AREA)
  • Otolaryngology (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Circuit For Audible Band Transducer (AREA)
EP17201681.8A 2016-12-15 2017-11-14 Procédé de détermination de direction d'une source de signal Withdrawn EP3337189A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102016225205.4A DE102016225205A1 (de) 2016-12-15 2016-12-15 Verfahren zum Bestimmen einer Richtung einer Nutzsignalquelle

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EP3337189A1 true EP3337189A1 (fr) 2018-06-20

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US (1) US10349189B2 (fr)
EP (1) EP3337189A1 (fr)
JP (1) JP6612311B2 (fr)
CN (1) CN108235207B (fr)
AU (1) AU2017272162B2 (fr)
DE (1) DE102016225205A1 (fr)

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EP4149121A1 (fr) 2021-09-13 2023-03-15 Sivantos Pte. Ltd. Procédé de fonctionnement d'un appareil auditif
EP4184948A1 (fr) 2021-11-17 2023-05-24 Sivantos Pte. Ltd. Système auditif comprenant un instrument auditif et procédé de fonctionnement de l'instrument auditif

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DE102019201879B3 (de) * 2019-02-13 2020-06-04 Sivantos Pte. Ltd. Verfahren zum Betrieb eines Hörsystems und Hörsystem
DE102020207579A1 (de) 2020-06-18 2021-12-23 Sivantos Pte. Ltd. Verfahren zur richtungsabhängigen Rauschunterdrückung für ein Hörsystem, welches eine Hörvorrichtung umfasst
EP4449412A1 (fr) 2021-12-13 2024-10-23 Widex A/S Procédé de fonctionnement d'un système de dispositif audio et système de dispositif audio
US20250046330A1 (en) * 2021-12-13 2025-02-06 Widex A/S Method of operating an audio device system and an audio device system
DE102023202437B4 (de) * 2023-03-20 2024-10-17 Sivantos Pte. Ltd. Verfahren zur Lokalisierung einer Schallquelle für ein binaurales Hörsystem
DE102023208468A1 (de) * 2023-09-04 2025-03-06 Sivantos Pte. Ltd. Verfahren zur direktionalen Signalverarbeitung für ein Hörsystem

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CN108235207A (zh) 2018-06-29
JP2018098797A (ja) 2018-06-21
AU2017272162B2 (en) 2019-03-07
JP6612311B2 (ja) 2019-11-27
US20180176694A1 (en) 2018-06-21
DE102016225205A1 (de) 2018-06-21
CN108235207B (zh) 2020-09-01
AU2017272162A1 (en) 2018-07-05
US10349189B2 (en) 2019-07-09

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