CN105744455A - Method of superimposing spatial auditory cues on externally picked-up microphone signals - Google Patents
Method of superimposing spatial auditory cues on externally picked-up microphone signals Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R25/00—Deaf-aid sets, i.e. electro-acoustic or electro-mechanical hearing aids; Electric tinnitus maskers providing an auditory perception
- 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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R25/00—Deaf-aid sets, i.e. electro-acoustic or electro-mechanical hearing aids; Electric tinnitus maskers providing an auditory perception
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2420/00—Details of connection covered by H04R, not provided for in its groups
- H04R2420/01—Input selection or mixing for amplifiers or loudspeakers
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; 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
Abstract
The invention on one hand relates to a method of superimposing spatial auditory cues on externally picked-up microphone signals in a hearing instrument. The method comprises the following steps: an external microphone apparatus generating an external microphone signal and transmitting the external microphone signal to a wireless receiver of a first hearing instrument through a first wireless communication link. The method further includes the following steps: associating the external microphone signal and a first hearing auxiliary microphone signal of the first hearing instrument so as to determine a responding characteristic of a first spatial synthesis filter; and filtering the external microphone signal by the first spatial synthesis filter so as to generate a first synthesis microphone signal including a first spatial hearing cue.
Description
Technical field
The method that the disclosure relates to, in first aspect, outside pickup acoustical signal spatial hearing prompting being added in hearing instrument.The method comprises the steps, it is generated external microphone signal by external microphone device, and sends external microphone signal via the wireless receiver of first wireless communication link road direction the first hearing instrument.The further step of the method includes, by the first audition auxiliary microphone signal correction by external microphone signal and the first hearing instrument, determining the response characteristic of the first space combination wave filter；And by the first space combination filters filter external microphone signal, to produce to include the first synthesis microphone signal of the first spatial hearing prompting.
Background technology
Hearing instrument or sonifer generally include microphone apparatus, and this microphone apparatus includes one or more mikes of the incoming sound for receiving such as voice and music signal.The sound arrived is converted into the electric microphone signal or multiple electricity microphone signal that amplify in the control and process circuit of the hearing instrument according to one or more presetting parameter settings listening to program and process.Generally calculate from the specific audition deficiency of the hearing impaired individual such as expressed in the algorithm or loss for each parameter setting listening to program.(i.e. hearing compensation) microphone signal that the out amplifier of hearing instrument processes via the output transducer transmission of such as Microspeaker, receptor or possible electrod-array is to user's auditory meatus.Microspeaker or receptor can be arranged in conjunction with in the microphone apparatus housing at hearing instrument or enclosure, or are separately provided in the earplug or receiver of hearing instrument.
Hearing impaired persons is generally subjected to the loss of auditory sensitivity, and frequency and the level of discussed sound is depended in its loss.Therefore, hearing impaired persons's possibility can hear some frequency (such as low frequency) identical with normal good hearing personage, but cannot hear the sound at other frequency (such as, altofrequency) place with the sensitivity identical with normal good hearing individuality.Equally, hearing impaired persons is likely to perceive the loud sound being such as higher than 90 decibels of SPL, has the intensity identical with normal good hearing personage, but still cannot hear the slight sound with the sensitivity identical with normal good hearing personage.Therefore, in the case of the latter, hearing impaired persons suffers the loss in some frequency or the dynamic range at frequency band place.
Except the said frequencies and level dependency hearing loss of hearing impaired persons, the ability distinguished between competition or interference sound source that loss often leads to such as in having the noisy acoustic environment of multiple active loudspeaker and/or noise source declines.Healthy hearing system depends on famous cocktail party effect, to distinguish between competition under this severe condition of listening to or the sound source of interference.The signal to noise ratio (SNR) of the sound at hearer's ear place is likely to non-normally low, for instance at about 0 decibel.Cocktail party effect is among others dependent on the spatial hearing prompting in competition or interference sound source, performs differentiation with the space orientation based on competition sound source.Under this severe condition of listening to, the SNR of the sound received at the ear place of hearing impaired individual is likely to so low so that hearing impaired individual cannot detect and use spatial hearing to point out, to make a distinction between the acoustic streaming different in competition sound source.To the hearing impaired persons compared with normal good hearing person, which results in the ability of the severe exacerbation hearing and understanding voice in noisy acoustic environment.
The analog-and digital-sonifer of many prior aries is designed to alleviate in noisy acoustic environment the above-mentioned auditorily handicapped determined.SNR enhancement techniques has been applied to such as various types of fixing or adaptive beam formation audition auxiliary microphone signal by the common methods solving this problem, to provide the directivity strengthened.Regardless of whether based on wireless technology, these technology have been shown having limited impact.Introduction along with wireless hearing ancillary technique and accessory, it has also become it is possible that external microphone device is disposed close to or in some cases in target sound source (namely via belt or shirt clip).External microphone device can such as be contained in portable unit, the speaker of its teacher being positioned proximate in such as classroom environment.Degree of closeness due to microphone apparatus to target sound source, it is possible to generate and have the external microphone signal of target sound signal, has significantly higher for the SNR SNR than the same target acoustical signal in hearing instrument mike place record/reception.External microphone signal is sent to left ear and/or the wireless receiver of auris dextra hearing instrument via a suitable wireless communication link or multiple wireless communication link.One wireless communication link or multiple wireless communication link can based on proprietary or industry standard wireless technology, such as bluetooths.One hearing instrument or multiple hearing instrument reproduce thereafter the external microphone signal of the Further aim acoustical signal with SNR and assist the ear of user or two ears to audition via suitable processor and output transducer.
But, the external microphone device of this prior art the external microphone signal generated due in sound field its remote or remote location and lack spatial hearing prompting.This remote or remote location is normally located remotely from head and the ear place of audition auxiliary user, for instance remote more than 5 meters or 10 meters.The shortage of these spatial hearing prompting during the reproduction of the external microphone signal in a hearing instrument or multiple hearing instrument causes the artificial and offending internalization perception of target sound source.Sound source seems to be placed on inside the head of audition auxiliary user.It would thus be advantageous to provide the acoustical signal of external record or the pickup that can reproduce the suitable spatial cues with audition auxiliary user or the patient providing more natural sound perception.The microphone signal of the remotely pickup that this problem has been combined in hearing instrument by one or more embodiments described here, is solved by the spatial hearing prompting generated on the microphone signal of remotely record or pickup and superposition is suitable and is answered.
Summary of the invention
First aspect relates to the overlay space auditory cues method to the outside pickup acoustical signal in hearing instrument, comprises the steps:
A) in response to the sound clashed into, the external microphone device being arranged in sound field external microphone signal is generated,
B) external microphone signal is sent to the wireless receiver of the first hearing instrument via the first wireless communication link,
C) while receiving external microphone signal, the microphone apparatus of the first hearing instrument generating the first audition auxiliary microphone signal, wherein the first hearing instrument is placed in the sound field in the left ear of user or the left ear of auris dextra place or user or auris dextra,
D) by by external microphone signal and the first audition auxiliary microphone signal correction, determining the response characteristic of the first space combination wave filter,
E) in the first hearing instrument, the first space combination filters filter the external microphone signal received, to produce to include the first synthesis microphone signal of the first spatial hearing prompting.
The disclosure solves and solves when the external microphone device via remotely placement rather than the microphone apparatus by the first audition auxiliary or instrument have the prior art discussed above problem of the artificial and beastly inherence perception of target sound source when reproducing.The frequency response characteristic of the first space combination wave filter according to some embodiments or the determination of equivalent impulse response characteristic allow suitable spatial hearing prompting to be superimposed on the external microphone signal received.The prompting of these spatial hearing is corresponding largely to auditory cues, and this auditory cues is generated by the sound propagated from the true spatial location (wherein the first hearing instrument is set) of the Target Sound Field relative to audition user's head.Degree of closeness between outside microphone apparatus and target guarantees, target sound signal generally locates the signal to noise ratio that the target sound of the microphone apparatus pickup of reason the first audition auxiliary microphone signal is significantly higher.The microphone apparatus of the first hearing instrument is preferably accommodated in housing or the shell of the first hearing instrument, so that this microphone apparatus is arranged in the left ear of the audition auxiliary user depended on the circumstances or the left ear of auris dextra place or audition auxiliary user or auris dextra.It should be appreciated by those skilled in the art that the first hearing instrument can include different types of hearing instrument, such as so-called BTE type, ITE type, CIC type, RIC type etc..Therefore, the microphone apparatus of the first hearing instrument may be located at each position in the ear place of user or the ear of user, such as at the auricle of user, or at the outer in ear of user or in the auditory meatus of user.
Having the remarkable advantages that, the first space combination wave filter can be determined from the first audition auxiliary microphone signal and external microphone signal, without regard to the second audition auxiliary microphone signal picked up at another ear place of user.Therefore, the ears communication for the first and second audition auxiliary microphone signals between first or left ear hearing instrument and second or auris dextra hearing instrument there is no need.And the existence of radio transmitters that the such direct communication between the first and second hearing instruments will need at least one in the first and second hearing instruments, cause power consumption and the complexity of the increase of discussed hearing instrument.
This method preferably includes further step:
F) the first synthesis microphone signal is processed by the first audition auxiliary signal processor according to the individual hearing loss data of user, to produce the first hearing compensation output signal of the first hearing instrument；
G) present the first hearing compensation by the first output transducer and output signal to left ear or the auris dextra of user.First output transducer may be included in the housing of the first hearing instrument or enclosure arranges or is separately provided in the earplug or receiver of the first hearing instrument Microspeaker or receptor.The performance of the first audition auxiliary signal processor is discussed below.
Another embodiment of this method includes the corresponding spatial hearing of superposition and is prompted to and remotely picks up acoustical signal for left ear or the first hearing instrument and auris dextra or the second hearing instrument.This embodiment can generate ears spatial hearing and be prompted to the advantage that the ears process of the hearing impaired individuality acoustic signal to utilize and propagate in sound field (target sound of such as target sound source) is associated.Overlay space auditory cues includes further step to this ears method of the remotely acoustical signal of pickup:
B1) external microphone signal is sent to the wireless receiver of the second hearing instrument via the second wireless communication link,
C1) Tong Bu with receiving external microphone signal, the microphone apparatus of the second hearing instrument generate the second audition auxiliary microphone signal, wherein the second hearing instrument is placed in the sound field in another ear place of user or another ear of user,
D1) by by external microphone signal and the second audition auxiliary microphone signal correction, determining the response characteristic of second space composite filter,
E1) in the second hearing instrument, second space composite filter the external microphone signal received is filtered, to produce to include the second synthesis microphone signal of second space auditory cues.This ears method can include performing further step:
F1) the second synthesis microphone signal is processed by the second audition auxiliary signal processor of the second hearing instrument according to the individual hearing loss data of user, to produce the second hearing compensation output signal of the second hearing instrument；
G1) present the second hearing compensation by the second output transducer and output signal to another ear of user.
In an embodiment of this method, the step processing the first synthesis microphone signal includes:
Synthesize microphone signal by first and the first audition auxiliary microphone signal mixes with the first ratio, to produce hearing compensation output signal.
According to a this embodiment, in the dependency of the signal to noise ratio of the first microphone signal, change and synthesize the ratio between microphone signal and the first audition auxiliary microphone signal first.Described in detail below in conjunction with accompanying drawing with several advantages of mixing the first synthesis microphone signal and the first audition auxiliary microphone signal correction connection.
It will be understood by those skilled in the art that and exist the various ways of external microphone signal and the first audition auxiliary microphone signal correction, to determine according to above-mentioned step d) and/or step d1) the response characteristic of the first space combination wave filter.In an embodiment of this method, external microphone signal and the first audition auxiliary microphone signal carry out cross-correlation to determine the time delay between these signals.This embodiment comprises additionally in following steps: based on the cross correlation of external microphone signal and the first audition auxiliary microphone signal, determine the level difference between outside microphone signal and the first audition auxiliary microphone signal, determine the response characteristic of the first space combination wave filter by the time delay determined being multiplied with the level difference determined.
External microphone signal sE(t) and the first audition auxiliary microphone signal sLT the cross correlation of () can basis Perform；
Time delay τ between outside microphone signal and the first audition auxiliary microphone signalLFrom cross correlation rLT () is determined:
τL=argmaxtrL(t)；
At outside microphone signal sE(t) and the first audition auxiliary microphone signal sLLevel difference A between (t)L’Determination can basisPerform.
Finally, the impulse response g of the first space combination wave filter of the response characteristic of the first space combination wave filter is representedLT () can according to gL(t)=ALδ(t-τL) determine.
First synthesis microphone signal can at the impulse response g from the first space combination wave filterLT the time domain of () is generated by further step:
-by the impulse response convolution of external microphone signal and the first space combination wave filter.It will be appreciated by those skilled in the art that, first synthesis microphone signal can be represented by DFT or FFT of the first space combination wave filter and external microphone signal, responds from the corresponding frequencies of the first space combination wave filter and generates the frequency domain representation of external microphone signal.
In the alternate embodiment of this method, it is determined that according to above-mentioned steps d) and/or step d1) the external microphone signal of response characteristic of the first space combination wave filter and the dependency of the first audition auxiliary microphone signal include:
According to Determine the impulse response g of the first space combination wave filterL(t),
Wherein gLT () represents the impulse response of the first space combination wave filter.
Latter embodiment has the great advantage that the impulse response g of the first space combination wave filterLT () can be calculated as corresponding sef-adapting filter in real time by the signal processor for the first hearing instrument of second space composite filter and/or the suitable configurations of the second hearing instrument or programming.gLT the solution of () can include the microphone signal by the first sef-adapting filter filtering external to produce the output as sef-adapting filter of the first synthesis microphone signal, and deduct by the first synthesis microphone signal of the first sef-adapting filter output from the first audition auxiliary microphone signal, to produce error signal, the filter coefficient of self adaptation the first sef-adapting filter is carried out, to minimize error signal according to predetermined adaptive algorithm.These of first space combination wave filter are described in detail below in conjunction with accompanying drawing based on the embodiment of sef-adapting filter.
Second aspect relates to the hearing aid device system including the first hearing instrument and portable external microphone unit.Portable external microphone unit includes:
Microphone apparatus, it is for being placed in sound field and generating external microphone signal in response to the sound clashed into,
First radio transmitters, it is configured to send external microphone signal via the first wireless communication link.First hearing instrument of hearing aid device system includes:
Audition auxiliary or shell, in the left ear of its left ear being configured to be placed on user or auris dextra place or user or auris dextra,
First wireless receiver, it is configured to receive external microphone signal via the first wireless communication link,
First audition auxiliary microphone, it is configured to, when outside microphone signal synchronizes to receive, generate the first audition auxiliary microphone signal in response to sound,
First signal processor, it is configured through, by external microphone signal and the first audition auxiliary microphone signal correction, determining the response characteristic of the first space combination wave filter.First signal processor is further configured to the external microphone signal received by the first space combination filters filter, to produce to include the first synthesis microphone signal of the first spatial hearing prompting.
As discussed above, hearing aid device system can be configured to ears and uses the process with external microphone signal, so that the first hearing instrument is arranged in the left ear of user or auris dextra place or the left ear of user or auris dextra, and the second hearing instrument is arranged in another ear place of user or another ear of user.Therefore, hearing aid device system can include the second hearing instrument, comprising:
Second sonifer auxiliary shell or shell, in another ear of its another ear place being configured to be placed on user or user,
Second wireless receiver, it is configured to receive external microphone signal via the second wireless communication link,
Second audition auxiliary microphone, it is configured to, when outside microphone signal synchronizes to receive, generate the second audition auxiliary microphone signal in response to sound,
Secondary signal processor, it is configured to external microphone signal and the second audition auxiliary microphone signal correction, determine the response characteristic of second space composite filter, wherein secondary signal processor is further configured to and is filtered, by second space composite filter, the external microphone signal received, to produce to include the second synthesis microphone signal of second space auditory cues.
First and/or the signal processing function of each signal processor of secondary signal processor can perform or implement by special digital hardware or by the one or more computer programs of execution run on software programmable signal processor or multiple processor, program routine and thread.Each in the computer program, routine and the thread that perform can include multiple executable program instructions.Alternately, signal processing function can be performed by the combination of special digital hardware and the computer program of execution, routine and the thread that run on software programmable signal processor or multiple processor.Each method in the said method of external microphone signal and the second audition auxiliary microphone signal correction can be performed by the computer program of execution executable in the appropriate software programmable microprocessor of such as programmable digital signal processor, program routine or thread.Microprocessor and/or special digital hardware can be integrated on ASIC or implement on FPGA device.Similarly, the filtration of the external microphone signal received by the first space combination wave filter can be performed by the computer program of execution executable in the appropriate software programmable microprocessor of such as programmable digital signal processor, program routine or thread.Software programmable microprocessor and/or special digital hardware can be integrated on ASIC or implement on FPGA device.
Each in first and second wireless communication links can be transmitted based on the RF signal of external microphone signal to first and/or the second hearing instrument, for instance simulation FM technology or the various types of digital transmission technologies such as met with the bluetooth standard of such as bluetooth LE or other standardization RF communication protocol.In replacement scheme, each in the first and second wireless communication links can based on optical signal transmission.It is preferred for the first and second wireless communication links, to minimize system complexity with the wireless communication technology of type.
Overlay space auditory cues includes to the method for the outside pickup acoustical signal in hearing instrument:
Via the first wireless communication link, receive external microphone signal from the external microphone being arranged in sound field, wherein use the wireless receiver of the first hearing instrument to perform described reception behavior features；Being generated the first audition auxiliary microphone signal by the microphone system of described first hearing instrument, wherein said first hearing instrument lays respectively in the left ear of user or the left ear of auris dextra place or user or auris dextra；By by described external microphone signal and described first audition auxiliary microphone signal correction, it is determined that the response characteristic of the first spacing wave composite filter；And in described first hearing instrument, described first space combination filters filter the external microphone signal received, to produce to include the first synthesis microphone signal of the first spatial hearing prompting.
Alternatively, microphone system can include one or more mike.
Alternatively, the method also includes: processed the first synthesis microphone signal by the first signal processor according to the individual hearing loss data of user, to produce the first hearing compensation output signal of the first hearing instrument；And by the first output transducer, the first hearing compensation output signal is presented to left ear or the auris dextra of user.
Alternatively, the method also includes: receive external microphone signal via the second wireless communication link, wherein uses the wireless receiver of the second hearing instrument to perform to receive the behavior of external microphone signal via the second wireless communication link；When external microphone signal is received by the second hearing instrument, the second audition auxiliary microphone signal is generated by the microphone system of the second hearing instrument, wherein the first hearing instrument and the second hearing instrument lay respectively at left and right ear place, or in left and right ear, or vice versa；By by external microphone signal and the second audition auxiliary microphone signal correction, it is determined that the response characteristic of second space composite filter；And in the second hearing instrument, second space composite filter filter the external microphone signal received, to produce to include the second synthesis microphone signal of second space auditory cues.
Alternatively, the behavior processing the first synthesis microphone signal includes mixing the first synthesis microphone signal and the first audition auxiliary microphone signal with the first ratio, to produce hearing compensation output signal.
Alternatively, the method also includes, and depends on signal to noise ratio, changes and synthesizes the ratio between microphone signal and the first audition auxiliary microphone signal first.
Optionally it is determined that the behavior of response characteristic includes: by external microphone signal and the first audition auxiliary microphone signal cross-correlation, to determine the time delay between outside microphone signal and the first audition auxiliary microphone signal；Result based on the behavior from cross-correlation, it is determined that the level difference between outside microphone signal and the first audition auxiliary microphone signal；And by the time delay determined is multiplied with the level difference determined, it is determined that the response characteristic of the first space combination wave filter.
Alternatively, the behavior of external microphone signal and the first audition auxiliary microphone signal correction is included basis Determine rL(t),
Wherein sEMicrophone signal outside (t) expression, and sLT () represents the first audition auxiliary microphone signal；Time delay between outside microphone signal and the first audition auxiliary microphone signal is according to τL=argmaxtrLT () is determined:
Wherein τLExpress time postpones；Determine at outside microphone signal sE(t) and the first audition auxiliary microphone signal sLThe behavior of the level difference between (t) according toPerform；
Wherein ALRepresent level difference；And wherein determine that the behavior of response characteristic includes determining according to gL(t)=ALδ(t-τL) the impulse response g of the first space combination wave filterL(t)。
Alternatively, the first synthesis microphone signal produces also by by the impulse response convolution of external microphone signal and the first space combination wave filter.
Optionally it is determined that the behavior of response characteristic includes: according to Determine the impulse response g of the first space combination wave filterL(t),
Wherein gLT () represents the impulse response of the first space combination wave filter, sET () represents external microphone signal and sLT () represents the first audition auxiliary microphone signal.
Alternatively, the method also includes: deduct described first synthesis microphone signal from described first audition auxiliary microphone signal, to produce error signal；The filter coefficient for the first sef-adapting filter is determined, thus minimizing error signal according to predetermined adaptive algorithm.
Alternatively, when external microphone signal receives from external microphone, the first audition auxiliary microphone signal is generated by the microphone system of the first hearing instrument.
A kind of hearing aid device system, including: the first hearing instrument；And portable external microphone unit.Portable external microphone unit includes: mike, and it is used for being placed in sound field and for generating external microphone signal, and the first radio transmitters, and it is configured to send external microphone signal via the first wireless communication link.First hearing instrument includes: audition auxiliary shell or shell, in the left ear of its left ear being configured to be placed on user or auris dextra place or user or auris dextra；First wireless receiver, it is configured to receive external microphone signal via the first wireless communication link；First audition auxiliary microphone, it is configured to when external microphone signal is received by the first wireless receiver, the first audition auxiliary microphone signal is generated in response to sound, and first signal processor, it is configured through external microphone signal and the first audition auxiliary microphone signal correction, determine the response characteristic of the first space combination wave filter, wherein the first space combination wave filter is configured to filter the external microphone signal received, to produce to include the first synthesis microphone signal of the first spatial hearing prompting.
Alternatively, hearing aid device system also includes the second hearing instrument, and wherein said second hearing instrument includes: the second audition auxiliary shell or shell；Second wireless receiver, it is configured to receive external microphone signal via the second wireless communication link；Second audition auxiliary microphone, it is configured to, when external microphone signal is received by the second wireless receiver, generate the second audition auxiliary microphone signal；And secondary signal processor, it is configured to based on external microphone signal and the second audition auxiliary microphone signal, determine the response characteristic of second space composite filter, wherein second space composite filter is configured to filter the external microphone signal received, to produce to include the second synthesis microphone signal of second space auditory cues.
Described in detailed description below further feature, embodiment and advantage.
Accompanying drawing explanation
Embodiment be will be described in further detail in conjunction with accompanying drawing, in the accompanying drawings:
Fig. 1 is according to the first embodiment schematic block diagram via wireless communication link Yu the hearing aid device system including left and right ear hearing instrument of external microphone device communication；And
Fig. 2 illustrates the schematic block diagram that the sef-adapting filter that the real-time adaptive for left ear or the filter coefficient of the first space combination wave filter of auris dextra hearing instrument calculates solves.
Detailed description of the invention
Below with reference to accompanying drawing, various embodiment is described.Similar reference marker refers to element similar in full.Therefore description relative to each figure is not described in detail by similar element.It should also be noted that accompanying drawing is for only for ease of the description of embodiment.They are not intended as the restriction of the exhaustive description of invention required for protection or scope to claimed invention.Additionally, diagram embodiment need not have the whole aspects or advantage that illustrate.It is not necessarily limited to this embodiment in conjunction with the aspect described by specific embodiment or advantage, and can what other embodiments in office be implemented, even without so illustrating, or without so describing clearly.
Fig. 1 at disadvantageous sound or listens to the schematic diagram of the hearing aid device system of operation in environment according to first embodiment.Hearing aid device system 101 includes the external microphone device being arranged in the portable shell structure of portable external microphone unit 105.External microphone device can include one or more independent omnidirectional or shotgun microphone.Portable shell structure 105 can include rechargeable battery bag, it supplies power to one or more independent mike, and supplies electrical power to various electronic circuit further, such as digital control logic, user can reading screen or display, and wireless transceiver (not shown).A part for spouse's mike, clip mike, conference microphone or formation smart mobile phone or mobile phone that external microphone device can include.
Hearing aid device system 101 includes the first hearing instrument or sonifer 107, its auris dextra being arranged on hearing impaired individual or in left ear or auris dextra or left ear place；And second hearing instrument or sonifer 109, it is arranged in another ear of hearing impaired individual or another ear place.Therefore, hearing impaired individual 102 ears in the present example embodiment are equipped with sonifer, so that hearing compensation output signal is supplied to both left and right ears.It will be appreciated by those skilled in the art that different types of hearing instrument, such as so-called BTE type, ITE type, CIC type etc. can use, and depend on various factors, the size of the hearing loss of such as hearing impaired individual, personal like and disposal ability.
Each in first and second hearing instruments 107,109 includes wireless receiver or transceiver (not shown), each hearing instrument is allowed to receive wireless signal or data, the external microphone signal previously discussed particularly sent from portable external microphone unit 105.External microphone signal can be modulated and be sent as analogue signal or as digitally coded signal via wireless communication link 104.Wireless communication link can transmit based on RF signal, for instance, FM technology or digital transmission technology, for instance meet the RF communication protocol of bluetooth standard or other standard.In replacement scheme, wireless communication link 10 can based on optical signal transmission.
Hearing impaired individual 102 wishes to receive sound from target sound source 103, and this target sound source 103 is located in some of the hearing impaired individual 102 beyond away from the latter's mesion apart from upper speaker.As by the noise v disturbedL,RT () schematically shows, around hearing impaired individual 102 acoustic environment along with the low SNR at the corresponding mike place at the first and second hearing instruments 107,109 be disadvantageous.Noise vL,RT () can include many different types of common noise mechanism or source in practice, such as competitive speaker, motor vehicles, wind noise, cross-talk noise, music etc..Except except the direct noise sound components of various noise sources, interference noise sound vL,RT () can also include the various borders reflection of the room boundaries from the such as wall in room 110, floor and ceiling, wherein hearing impaired individual 102 is placed.Therefore, noise source usually produces noise sound components from the multiple direction in spaces at hearing impaired individual, makes the sound field in room 110 very challenging for the voice understanding target speaker 103, without the auxiliary from external microphone device.
The first linear transfer function between target speaker 103 and the first hearing instrument 107 is by dotted line hLT () schematically shows, and the second linear transfer function between target speaker 103 and the second hearing instrument 109 is equally by the second dotted line hRT () schematically shows.Due to Fourier transform equivalence, the first and second transmission function hL(t) and hRT () can by they corresponding impulse responses or by they corresponding frequency representations.First and second linear transfer functions describe first/right and left/the second hearing instrument from target speaker or caller 103 respectively to the sound transmission on right side and left side mike.
The acoustics picked up by the mike 107 of the first hearing instrument or acoustical signal produce to be expressed as sLThe first audition auxiliary microphone signal of (t), and the acoustics picked up by the mike 109 of auris dextra hearing instrument or acoustical signal produce to be expressed as s belowRThe second audition auxiliary microphone signal of (t).Noise sound signal at mike 109 place of right hearing instrument is expressed as vR(t), and the noise sound signal at mike 107 place of left hearing instrument is expressed as v belowL(t).The targeted voice signal produced by target speaker 103 is expressed as x (t) below.Additionally, based in audition auxiliary microphone 107,109 each pickup have experience linear transformation targeted voice signal x (t) noise version it is assumed that we can be write as:
WhereinIt it is convolution operator.
In the same time, the noisy targeted voice signal infecting or polluting version receives at hearing instrument mike place, left and right, and targeted voice signal x (t) is recorded at outside microphone apparatus or receives:
sE(t)=x (t)+vE(t)(3)
Wherein vET () i is the noise sound signal at external microphone place.
In addition, it is assumed that dominating role the target voice component of the external microphone signal picked up by external microphone device, so that targeted voice signal is more much bigger than the power of noise sound signal, it may be assumed that
Derive the present embodiment with the method on overlay space auditory cues to the external microphone device by the portable microphone unit 105 in each hearing instrument in left and right ear hearing instrument and preferably include following steps:
1) auditory spatial cues is estimated
2) auditory spatial cues synthesizer；And alternatively,
3) signal mixing.
A this embodiment according to this method, auditory spatial cues is determined or estimates to include time delay estimadon device and signal level estimator.First step includes external microphone signal sET () is relevant to each in the first or second audition auxiliary microphone signal, according to as follows:
For right and left microphone signal sR(t)、sLT the time delay of () is by identified below:
τL=argmaxtrL(t)(6a)
τR=argmaxtrR(t)(6b)
And at outside microphone signal and left and right microphone signal sL(t)、sRLevel difference A between (t)L、ARAccording to identified below:
In the second step, the impulse response for the impulse response of the left space composite filter of the application in left hearing instrument with for the right space composite filter of the application in right hearing instrument is derived as:
gL(t)=ALδ(t-τL)(8a)
gR(t)=ARδ(t-τR)(8b)。
In left hearing instrument, the computed impulse response g of left space composite filterLT () is for producing to have the first synthesis microphone signal y according to following superposition or the first spatial hearing prompting of interpolationL(t):
In right hearing instrument, the computed impulse response g of right space composite filterLT () is in the corresponding way for producing the second synthesis microphone signal y with the second space auditory cues according to following superposition or interpolationR(t):
Therefore, the first synthesis microphone signal yLT () is by by the impulse response g of left space composite filterL(t) and the external microphone signal s received by left hearing instrument via wireless communication link 104ET () convolution produces.Function rL(t)、AL、gL(t) and yLT the above-mentioned calculating of () is preferably performed by the first signal processor of left hearing instrument.First signal processor can include microprocessor and/or special digital computing hardware, and it such as includes hard-wired digital signal processor (DSP).In replacement scheme, the first signal processor can include software programmable DSP or the combination of special digital computing hardware and software programmable DSP.Software programmable DSP is configured by suitable program routine or thread and performs above-mentioned calculating, this program routine or thread each includes one group of executable program instructions being stored in the non-volatile memory device of hearing instrument.Second synthesis microphone signal yRT () is in the corresponding way by by the impulse response g of right space composite filterR(t) and the external microphone signal s received by right hearing instrument via wireless communication link 104E(t) convolution, and continue the signal processing in left hearing instrument in the corresponding way and produce.
It will be understood by those skilled in the art that the above-mentioned microphone signal of each in the hearing instrument of left and right and impulse response preferably represent in the digital domain, so that producing function rL(t)、AL、gL(t) and yLT the operation that calculates of () is performed with numerical value on digital signal by the digital signal processor that type was previously discussed.The signal y of the first synthesis mikeL(t), the first audition auxiliary microphone signal sL(t) and external microphone signal sEEach in (t) can be such as between 16kHz to 48kHz sample frequency place sampling digital signal.
First synthesis microphone signal is preferably further processed by the first audition auxiliary signal processor, and the individual hearing loss so that hearing compensation to export the left ear of the characteristic adaptation hearing impaired user of signal is distributed.It will be understood by those skilled in the art that this further processes and can include polytype common and known signal processing function, such as multiband dynamic range compression, noise reduction etc..After being subject to this further process, the left ear that the first synthesis microphone signal is rendered to hearing impaired persons via the first output transducer exports signal as hearing compensation.First (being also second) output transducer can include Microspeaker, receptor, or is probably the implant electrode array for cochlea implantation sonifer.Second synthesis microphone signal can be processed by the second hearing instrument in the corresponding way, to produce the second synthesis microphone signal and it is rendered to the auris dextra of hearing impaired persons.
Therefore, the suitable spatial hearing prompting corresponding with spatial cues is adopted to present to the left and right ear of hearing impaired persons by the external microphone signal of the remote microphone device pickup being contained in portable external microphone unit 105, the prompting of this spatial hearing will exist in audition auxiliary microphone signal, if the targeted voice signal produced by the target speaker 103 listening to his or her physical location in room is conveyed to the left and right ear mike 109,107 of hearing instrument by acoustics.This feature solves the problem being previously discussed as that the artificial and inherence of the target sound source of the inner portion of the audition auxiliary user with the reproduction picking up microphone signal in conjunction with prior art hearing aid device system medium-long range is perceptually relevant.
An embodiment according to this method, first hearing compensation output signal not only includes the first synthesis microphone signal completely, but also include by the component of the first audition auxiliary microphone or the first audition auxiliary microphone signal of multiple mike record, so that the left ear of hearing impaired individual is presented in the mixing of these different microphone signals.According to Latter embodiment, process the first synthesis microphone signal yLT the step of () including: synthesize microphone signal y by firstL(t) and the first audition auxiliary microphone signal sLT () mixes with the first ratio, to produce hearing compensation output signal zL(t)。
First synthesis microphone signal yL(t) and the first audition auxiliary microphone signal sLT the mixing of () can such as be implemented according to following:
zL(t)=bsL(t)+(1-b)yL(t)(10)
Wherein b controls the decimal number that blending ratio is between 0 and 1.
Composite character can utilize the relative level adjusting " original " or undressed microphone signal and external microphone signal, so that the SNR of left hearing compensation output signal can adjust.Signal z is exported at left hearing compensationLThe first audition auxiliary microphone signal s of (t)LT comprising of certain component of () is advantageous in many cases.First audition auxiliary microphone signal sLThe component of (t) or a part exist for should beneficial amount of " environmental consciousness " to hearing impaired persons, wherein other sound source of potential concern becomes available to listen than target speaker.Other sound source paid close attention to can such as include being sitting in the another person near hearing impaired persons or portable communication appts.
In another advantageous embodiment, the first synthesis microphone signal and the first audition auxiliary microphone signal sLT the Ratio-dependent between () is in the first audition auxiliary microphone signal sLThe signal to noise ratio of (t) and change.First audition auxiliary microphone signal sLT the signal to noise ratio of () can such as based on from external microphone signal sET some target voice data that () derives is estimated.The latter's microphone signal is assumed to be mainly or entirely to be dominated by the target sound source of target voice such as discussed above, and can thus be accordingly used in detection at the first audition auxiliary microphone signal sLThe level of the target voice existed in (t).As the first audition auxiliary microphone signal sLDuring the signal to noise ratio height of (t), may be implemented such that b is close to 1 according to the composite character of above equation (10), and as the first audition auxiliary microphone signal sLWhen the signal to noise ratio of () is low t, b is close to 0.As the first audition auxiliary microphone signal sLWhen the signal to noise ratio of () is more than 10dB t, the value of b such as can more than 0.9.In contrary acoustic situations, as the first audition auxiliary microphone signal sLWhen the signal to noise ratio of () is less than 3dB or 0dB t, the value of b such as can less than 0.1.
Another embodiment according to this method, the estimation of auditory spatial cues or calculating include left and/or right space combination wave filter gL(t)、gRDirect or On-line Estimation, this left and/or right space combination wave filter g of the impulse response of (t)L(t)、gRT linear transfer function between target sound source and left and right ear audition auxiliary microphone is described or modeling by () respectively.
According to On-line Estimation program, first or the calculating of impulse response of space combination wave filter of left ear or estimate preferably by solving following optimization problem or equation realizes:
It will be understood by those skilled in the art that external microphone signal sET () is it can be reasonably assumed that arranged (degree of closeness due between outside microphone apparatus and target sound source) by target sound signal.This assumes that the mode meaning only to minimize the error (and error of corresponding formula below (12)) of equation (11) is from the first audition auxiliary microphone signal sLT () removes target sound signal or component completely.This mates the first linear transfer function h between target sound source or speaker 103 and the first hearing instrument 107 by selecting the response of wave filter g (t)LT () completes.This reasoning is based on target sound signal and interference noise sound vL,R(t) incoherent hypothesis.Experience have shown that, this is usually the available hypothesis in numerous actual life acoustic environments.
Therefore, second or the calculating or estimate also preferably through solving following optimization problem or equation realizes of impulse response of space combination wave filter of auris dextra:
gL(t) and gRT each Tong Guo the application efficient adaptive algorithm (such as lowest mean square (LMS) or recurrence least square (RLS)) in these calculating of () carrys out real-time implementation.This solves and is illustrated by Fig. 2, its illustrate above-mentioned optimization method (11) how use sef-adapting filter 209 to schematically show in the signal processor of left hearing instrument 200 can the simplified block diagram of Real-time solution.Solve accordingly and certainly can apply in hearing instrument (not shown) right, left accordingly.
External microphone signal sEIf t () is by decoding and receive in an analogue form, the previously discussed wireless receiver (not shown) being possibly converting to number format receives.Digital external microphone signal sET () is applied to the input of sef-adapting filter 209, and filtered by the current transfer function of sef-adapting filter 209/impulse response, to produce the first synthesis microphone signal y of output place at sef-adapting filterL(t).First audition auxiliary microphone signal sLT () is substantially simultaneously applied to the first input or SUbtractive function 204 of subtractor 204.First or left ear synthesis microphone signal yLT () is applied to the second input 204 of subtractor, so that the latter produces the error signal on holding wire 206, it represents at yL(t) and sLDifference between (t).Error signal is applied to the Self Adaptive Control of sef-adapting filter 209 via holding wire 206 in a conventional manner and is inputted, so that the filter coefficient of sef-adapting filter is adjusted minimizing error signal according to the specific adaptive algorithm implemented by adaptive algorithm 209.Therefore, first or left ear space combination wave filter formed by sef-adapting filter 209, this makes filter coefficient gLT the real-time adaptive of () calculates feasible.
In general, digital external microphone signal sET () is filtered by the self adaptation transfer function of sef-adapting filter 209, itself so that represent the space combination wave filter of left ear, to produce to include the left ear synthesis microphone signal y of the first spatial hearing promptingL(t).The digital external microphone signal s of function is transmitted by the self adaptation of sef-adapting filter 209ET the filtration of () can perform as at adaptation coefficient gL(t) and numeral external microphone signal sET the discrete-time convolution between (), namely directly performs the convolution operation specified by above-mentioned equation (9a):
Left hearing instrument 200 comprises additionally in previously discussed micro-receiver or speaker 211, signal processor 208 hearing compensation produced is exported signal and is converted to audible sound by it, for being transferred to the eardrum of hearing impaired persons.Signal processor 208 can include suitable out amplifier, for instance class-D amplifier, is used for driving micro-receiver or speaker 211.
It will be appreciated by those skilled in the art that the feature of auris dextra hearing instrument and function can be identical with the feature discussed above of left hearing instrument 200 and function, to produce binaural signal to hearing aid user.
Microphone signal y is synthesized firstL(t) and the first audition auxiliary microphone signal sLWith the optional mixing of the first ratio between (t), and synthesize microphone signal y secondR(t) and the second audition auxiliary microphone signal sRT between (), the class Sihe with the second ratio optionally mixes, to produce left and right hearing compensation output signal z respectivelyL, R(t), it is preferable that perform as discussed above, i.e. basis:
zL, R(t)=bsL, R(t)+(1-b)yL, R(t)(14)
Mixed coefficint b can be fixed value, can be maybe user operation.Mixed coefficint b can alternative be controlled by independent algorithm, this independent algorithm is by comparing the contribution of the echo signal component measured by the external microphone signal existed in audition auxiliary microphone signal, and the level of the noise component(s) of comparison object component of signal and noise component(s), monitor SNR.When SNR height, b will to 1, and when SNR is low, b will close to 0.
Although concrete feature has shown that and describes, it is to be understood that, they are not intended to restriction claimed invention, and it will be apparent for a person skilled in the art that and can carry out variations and modifications, without departing from the spirit and scope of invention required for protection.The specification and drawings correspondingly should be considered to be illustrative and not restrictive.Invention required for protection is intended to all replacement schemes, amendment and is equal to.
Claims (13)
1. a method for outside pickup acoustical signal spatial hearing prompting being added in hearing instrument, including:
Via the first wireless communication link, receive external microphone signal from the external microphone being arranged in sound field, wherein use the wireless receiver of the first hearing instrument to perform described reception behavior features；
Being generated the first audition auxiliary microphone signal by the microphone system of described first hearing instrument, wherein said first hearing instrument is arranged in the left ear of user or the left ear of auris dextra place or user or auris dextra；
By by described external microphone signal and described first audition auxiliary microphone signal correction, it is determined that the response characteristic of the first spacing wave composite filter；And
In described first hearing instrument, described first space combination filters filter the external microphone signal received, to produce to include the first synthesis microphone signal of the first spatial hearing prompting.
2. method according to claim 1, also includes:
Described first synthesis microphone signal is processed according to the individual hearing loss data of described user, to produce the first hearing compensation output signal of described first hearing instrument by the first signal processor；And
By the first output transducer, described first hearing compensation output signal is presented to left ear or the auris dextra of described user.
3. method according to claim 1, also includes:
Receive described external microphone signal via the second wireless communication link, wherein use the wireless receiver of the second hearing instrument to perform to receive via described second wireless communication link the behavior of described external microphone signal；
When described external microphone signal is received by described second hearing instrument, the second audition auxiliary microphone signal is generated by the microphone system of described second hearing instrument, wherein said first hearing instrument and described second hearing instrument lay respectively at described left ear and described auris dextra place, or in described left ear and described auris dextra, or vice versa；
By by described external microphone signal and described second audition auxiliary microphone signal correction, it is determined that the response characteristic of second space composite filter；And
In described second hearing instrument, described second space composite filter filter the external microphone signal received, to produce to include the second synthesis microphone signal of second space auditory cues.
4. method according to claim 2, the behavior wherein processing described first synthesis microphone signal includes, synthesize microphone signal by described first and described first audition auxiliary microphone signal mixes with the first ratio, to produce described hearing compensation output signal.
5. method according to claim 4, also includes, and depends on signal to noise ratio, changes and synthesizes the described ratio between microphone signal and described first audition auxiliary microphone signal described first.
6. method according to claim 1, wherein determines that the behavior of described response characteristic includes:
Described external microphone signal and described first audition auxiliary microphone signal are carried out cross-correlation, to determine the time delay between described external microphone signal and described first audition auxiliary microphone signal；
Based on the result from cross-correlation behavior, it is determined that the level difference between described external microphone signal and described first audition auxiliary microphone signal；And
By determined time delay is multiplied with determined level difference, it is determined that the response characteristic of described first space combination wave filter.
7. method according to claim 6, wherein:
The behavior of described external microphone signal and described first audition auxiliary microphone signal cross-correlation is included, according toDetermine rL(t),
Wherein sET () represents described external microphone signal and sLT () represents described first audition auxiliary microphone signal；
Described time delay between described external microphone signal and described first audition auxiliary microphone signal is according to τL=argmaxtrLT () is determined:
Wherein τLRepresent described time delay；
Determine at described external microphone signal sE(t) and described first audition auxiliary microphone signal sLThe behavior of the described level difference between (t) according toPerform；
Wherein ALRepresent described level difference；And
Wherein determine that the behavior of described response characteristic includes according to gL(t)=ALδ(t-τL) determine the impulse response g of described first space combination wave filterL(t)。
8. method according to claim 1, wherein said first synthesis microphone signal produces also by the impulse response of described external microphone signal and described first space combination wave filter is carried out convolution.
9. method according to claim 1, wherein determines that the behavior of described response characteristic includes:
According toDetermine the impulse response g of described first space combination wave filterL(t),
Wherein gLT () represents the described impulse response of described first space combination wave filter,
sET () represents described external microphone signal, and
sLT () represents described first audition auxiliary microphone signal.
10. method according to claim 1, also includes:
Described first synthesis microphone signal is deducted, to produce error signal from described first audition auxiliary microphone signal；And
The filter coefficient for described first sef-adapting filter is determined, thus minimizing described error signal according to predetermined adaptive algorithm.
11. method according to claim 1, wherein when described external microphone signal receives from described external microphone, described first audition auxiliary microphone signal is generated by the microphone system of described first hearing instrument.
12. a hearing aid device system, including:
First hearing instrument；And
Portable external microphone unit；
Wherein said portable external microphone unit includes:
Mike, it is placed in sound field and for generating external microphone signal, and
First radio transmitters, it is configured to send described external microphone signal via the first wireless communication link, and
Wherein said first hearing instrument includes:
Audition auxiliary shell or shell, it is configured to, and is placed in the left ear of user or the left ear of auris dextra place or user or auris dextra,
First wireless receiver, it is configured to, and receives described external microphone signal via described first wireless communication link,
First audition auxiliary microphone, it is configured to, and when described external microphone signal is received by described first wireless receiver, generates the first audition auxiliary microphone signal in response to sound, and
First signal processor, it is configured to, by by described external microphone signal and described first audition auxiliary microphone signal correction, determining the response characteristic of the first space combination wave filter,
Wherein said first space combination wave filter is configured to filter the external microphone signal received, to produce to include the first synthesis microphone signal of the first spatial hearing prompting.
13. hearing aid device system according to claim 12, also including the second hearing instrument, wherein said second hearing instrument includes:
Second audition auxiliary shell or shell,
Second wireless receiver, it is configured to receive described external microphone signal via the second wireless communication link,
Second audition auxiliary microphone, it is configured to, when described external microphone signal is received by described second wireless receiver, generate the second audition auxiliary microphone signal, and
Secondary signal processor, it is configured to, based on described external microphone signal and described second audition auxiliary microphone signal, determine the response characteristic of second space composite filter,
Wherein said second space composite filter is configured to filter the external microphone signal received, to produce to include the second synthesis microphone signal of second space auditory cues.
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| DE102018203907A1 (en) * | 2018-02-28 | 2019-08-29 | Sivantos Pte. Ltd. | Method for operating a hearing aid |
| WO2023192312A1 (en) * | 2022-03-29 | 2023-10-05 | The Board Of Trustees Of The University Of Illinois | Adaptive binaural filtering for listening system using remote signal sources and on-ear microphones |
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| JP6762091B2 (en) | 2020-09-30 |
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