CN103546849A - Frequency-no-masking hearing-aid for double ears - Google Patents
Frequency-no-masking hearing-aid for double ears Download PDFInfo
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Abstract
This invention discloses a frequency-no-masking hearing aid for ears. The novel double-ear hearing aid uses a new method to compensate the comprehension of a hearing-impaired user in noise. The novel method comprises steps of providing at least microphone audio frequency signal (18,20) by responding to the sound; and providing at least one evaluation of evaluations of object signal (26) and noise signals (30) based on at least one microphone audio frequency signal (18,20). At least one of the evaluations of the object signals (26) and the noise signals (30) is modified by the following methods of modifying the evaluation of the object signal (26) and the evaluation of the noise signal (30) which are positioned within different frequency bands; sending an evaluation of modified the object signal to the drumhead of the user of the double-ear hearing aid (10); and sending another modified evaluation of the noise signal of the drumhead of the user.
Description
Technical field
Provide a kind of new binaural hearing aid system, the forfeiture of the ability of the voice of the understanding of this system balance sense of hearing visually-impaired user in noise.
Background technology
The impaired individual of the sense of hearing often experiences at least two obvious problems: hearing loss, and this is the increase in threshold of audibility level; And compare with the individual of normal hearing for understanding the forfeiture in the ability of the high-level voice of noise.For the impaired patient of most of sense of hearings, the performance in the test of the intelligibility of speech in noise is poorer than the people of normal hearing, even by the audibility of the sound that amplifies to recover to enter.Individual's phonetic incepting threshold value (SRT) is the signal to noise ratio needing in presented signal for obtain 50% correct word identification in the hearing test of noise.
Use the digital deaf-aid of today of multichannel amplification and compressed signal processing can easily recover the audibility of voice emplifying for the impaired individual of the sense of hearing.Therefore by the voice clue that makes previously can not listen, can listen, can improve patient's hearing ability.
For the forfeiture understood in the ability of the voice of noise, it is the sixty-four dollar question of most of hearing aid users today.The traditional approach that improves SRT in instrument is that application of beam forms or frequency spectrum minimizing technology.
In the first situation, fixing or adaptive, with at least one microphones of a plurality of filter banks for strengthening the signal from the target direction of supposition, and suppress every other signal simultaneously.
In frequency spectrum minimizing technology, target is the estimation of setting up long-term noise spectrum, and reduces fast-opening target signal power wherein lower than the gain in the frequency band of long-term noise power.Even if it is very different that these methods are seen from technology viewpoint, but they still have public target; Strengthen echo signal and remove noise jamming.
These methods can not be considered listener's wish, and may remove the part that listener attempts the audio signal of concern.
Summary of the invention
Below, new and method invention of the enhancing of echo signal is disclosed.This new method utilization concentrates on the ability of the auditory system of the people in echo signal.A kind of new and binaural hearing aid system invention that uses this new method is also disclosed.
Run through the disclosure, echo signal means that people expects the signal of the sound listened to.
Voice, music and sound are the example of echo signal in nature.
Run through the disclosure, masking signal also means the signal of sound; Yet this sound is that people perceives the sound disturbing with less desirable mode and echo signal, this less desirable mode for example makes people's indigestion or appreciates echo signal.
Described masking signal can be brouhahas, music (when voice are echo signal), traffic noise in background sound, restaurant etc.
By the ears in auditory system, process to promote to listen to complicated sound field largely.Because the diffracting effect of auricle, external ear, head and trunk and because reflecting effect in the environment that echoes, clue is provided to sound field, and for given to as if highly personalized.
Most important clue in ears are processed is time difference (ITD) between ear and the level difference (ILD) between ear.ITD is derived from source to the difference in the distance of two ears.This clue is until approximately 1.5kHz is mainly useful, and is greater than this frequency, and auditory system no longer can solve ITD clue.
Level difference is the result of diffraction, and the Relative position determination of comparing with source by ear.This clue is preponderated more than 2kHz, but auditory system is responsive comparably for the change on the ILD on whole frequency spectrum.
Argue, the impaired object of the sense of hearing is benefited from ITD clue most, more not serious because hearing loss trends towards in low frequency.
In new binaural hearing aid, by eardrum export target signal and the masking signal to the user of binaural hearing aid in different frequency bands, improve the intelligibility of speech.
By this way, by signal being separated into when different frequency bands reduces because of echo signal and masking signal, exist the energy causing to shelter.
Illustrate, for the language as echo signal with as the Gaussian noise of masking signal, can obtain for the listener with normal hearing the improvement of the SRT of 15dB, and for the impaired listener of the sense of hearing, obtain the improvement of the SRT of about 10dB.
In the situation that do not remove a part for signal, obtain this improvement; But the eardrum to user presents target and masking signal in the following manner: the auditory system of user's auditory system can be carried out natural noise and reduce, and echo signal is separated with masking signal.
Therefore, provide a kind of new hearing aids, having comprised:
At least one microphone, provides at least one microphone audio signal for the sound in response to receiving at described at least one microphone place,
Signal separation unit, it is configured to provide based on described at least one microphone audio signal the estimation of echo signal and masking signal,
Frequency modification unit, it is configured to revise at least one the frequency content in the estimation of described echo signal and described masking signal, make when by described frequency modification cell processing, substantially in different frequency bands, export estimated echo signal and estimated masking signal
Receiver, for being revised by described frequency modification unit and the estimation of described echo signal of output and the Combination conversion of the estimation of described masking signal are will be to the acoustic signal of a transmission of the user's of described binaural hearing aid system ear.
In one embodiment, when for example the frequency band of hearing aids surpass 51% in the majority at frequency band in and in the major part that surpasses time of 51% in for example time, another in the signal of for example masking signal in the signal of for example echo signal in frequency band and another in frequency band has 20% signal level of the signal level that is less than another signal, such as be less than another signal signal level 15%, preferably be less than another signal signal level 10%, more preferably be less than another signal signal level 5%, most preferably be less than another signal signal level 1% time, think that two signals are output substantially in the different frequency band of described hearing aids.
This signal level can be the RMS value that limits in predetermined amount of time, peak value, averaged amplitude value etc.
Described new hearing aids can form the first hearing aids of new binaural hearing aid system, described new binaural hearing aid system further has the second hearing aids, described the second hearing aids comprises at least one microphone, described at least one microphone provides corresponding at least one microphone audio signal for the sound in response to receiving at described at least one microphone place, and wherein
Transceiver in described the second hearing aids is connected to for sending to described the first hearing aids the signal that represents described at least one microphone audio signal, and wherein
Transceiver in described the first hearing aids is connected to for receiving the signal of described at least one microphone audio signal that represents described the second hearing aids, and wherein
Described at least one microphone audio signal that described signal separation unit is configured to based on described the first and second hearing aidss provides the estimation of described echo signal and the estimation of described masking signal.
And, a kind of new and method invention are provided, comprise step:
At least one microphone audio signal is provided in response to sound, and
The estimation of echo signal and masking signal is provided based on described at least one audio signal,
With the estimation of modified described echo signal and the estimation of described masking signal, substantially reside in mode in different frequency bands at least one in the estimation of the estimation of described echo signal and described masking signal carried out to frequency modification, and
To one in people's eardrum combination that sends the estimation of modified described echo signal and the estimation of described masking signal.
Described frequency modification unit can be configured to a frequency displacement in the estimation of the estimation of described echo signal and described masking signal to another the substantially non-existent frequency field in the estimation of wherein said echo signal and the estimation of described masking signal.
Further or as an alternative, described frequency modification unit can be configured to determine respectively pitch (pitch) and the overtone of the estimation of described echo signal and the estimation of described masking signal, and described in frequency displacement in the estimation of echo signal and the estimation of described masking signal one, makes between the pitch and corresponding pitch and overtone that overtone resides in another signal of signal of described frequency displacement.
Further or as an alternative, described frequency modification unit can comprise bank of filters, and described frequency modification unit can be configured to utilize the estimation of echo signal described in the band division filter of the estimation be assigned to described echo signal, and utilize the estimation of masking signal described in other band division filters of the estimation that is assigned to described masking signal.
Described bank of filters can be tuned to the auditory filter that is intended to user.
Also illustrate, between the relative ear of manipulation of objects signal and masking signal, phase place and level can improve the intelligibility of speech significantly, and described echo signal is that listener expects the signal of listening to, and described masking signal is that listener is the signal disturbing.Seem to seem that auditory system is adapted the separated signal with different I TD and ILD coding really, to carry out sheltering of natural type, reduce, with facility, pay close attention to described echo signal.
Have been found that, if echo signal described in two ears anti-phase present, that is, and 180 ° of phase shifts, and masking signal in phase presents, with when two signals homophase in two ears, be the increase of the ears masking level poor (BMLD) that can realize 13dB of comparing now.The type that depends on masking signal, can realize the improvement of the 20dB of BMLD.
The reverse situation that wherein masking signal out of phase presents and echo signal in phase presents produces lower slightly performance.
Therefore, described frequency modification unit also can be configured to the estimation with respect to echo signal described in the estimation phase shift of described masking signal.
By this way, further improve user and understood the ability at the voice of noise.
For example, if echo signal is designated as S and masking signal is designated as N, the voice signal entering is S+N.Based on voice signal S+N, estimating target signal S, and described estimated statement is shown to ES.The estimation of described masking signal is appointed as to EN, and can determines EN by deduct described estimation ES from described voice signal S+N.
Below, S, N, ES, EN specify in each in the signal after each or the frequency modification in the signal before the frequency modification in described frequency modification unit.
By the signal S+N from entering, deduct ES twice, result is: S+N-ES-ES, the estimation ES of described echo signal can be with respect to 180 ° of the estimation EN phase shifts of described masking signal.Because ES is approximately equal to S, so the result of subtracting each other is approximate, be: N-ES, its be approximately equal to-ES+EN, the estimation ES of described echo signal is with respect to 180 ° substantially of the estimation phase shifts of described masking signal.Can before or after the frequency modification in described frequency modification unit, carry out this operation.
It should be noted that and do not require the accurate or approximate phase shift of 180 ° to obtain the remarkable improvement of SRT; But, utilize the phase in-migration in the scope of 135 °-225 ° such as 150 °-210 ° to obtain such improvement.
Now, can present primary signal S+N to user's a ear, and, can present to another ear the signal N-ES of phase shift, or S+N-2ES more accurately, as above openly to improve BMLD and SRT.
As an alternative, can estimating target signal S and masking signal N, and can present to user's a ear estimate ES+EN's and, and, can to another ear present phase shift and-ES+EN, as above openly to improve BMLD and SRT.Can before or after the frequency modification in described frequency modification unit, carry out this operation.
Described echo signal S and described masking signal can be exchanged, make described masking signal estimate to be phase-shifted, rather than described echo signal, as above openly to improve BMLD and SRT; Yet, compare and reduced performance with echo signal S described in phase shift.
Run through the disclosure, when function that a signal is another signal, think and for example, can form a described signal by analog-to-digital conversion or the digital-to-analogue conversion of described another signal by another signal described in a described signal indication; Or, can by the conversion from another acoustic signal to electronic signal or vice versa form a described signal; Or, can or mix described another signal by analog or digital filtering and form a described signal; Or, can by described another to the conversion such as frequency translation etc. form a described signal; Etc..
And for example the signal of being processed by particular electrical circuit in signal processor can be by forming from the source of discussed signal and identify to the title of any analog or digital signal of a part for the signal path of the input of the circuit of discussed for example signal processor for identification.For example, the output signal of microphone (being microphone audio signal) can form any analog or digital signal that exports its part to the signal path of the input of described signal processor to from described microphone for identification, and described analog or digital signal comprises pretreated microphone audio signal.
Described at least one microphone can consist of single microphone; Yet preferably, described at least one microphone comprises single microphone, a plurality of microphones for example, such as two microphones.Described at least one microphone can have two microphones of surpassing, to improve the separated of echo signal and masking signal.
In order to improve signal, strengthen, described the second hearing aids also can comprise at least one microphone, for the sound in response to receiving at corresponding microphone place, provides microphone audio signal.In this case, the described transceiver of described the first hearing aids is connected to for receiving the signal of the described microphone audio signal that represents described the second hearing aids, and the described audio signal that described signal separation unit is configured to based on described the first and second hearing aidss provides the estimation of described echo signal and the estimation of described masking signal.
Preferably, described frequency modification unit is the estimation with respect to echo signal described in the estimation phase shift of described masking signal with phase in-migration, and the scope of described phase shift is from 150 ° to 210 °, more preferably, described phase shift is approximately equal to 180 °, and most preferably equals 180 °.
Improvement as the SRT of Phase-shift function has maximum at 180 °; Yet described function is to have smooth peaked sinusoidal shape, make from the improvement of the phase shift acquisition of 150 ° to 210 °, to approach maximum improvement by scope.Therefore, phase shift needn't be accurately 180 °, but preferably have scope from 135 ° in 225 °, more preferably from the value of 150 ° to 210 °.
Preferably, at user's two ears, with opposite phase, relative to each other 180 ° of phase shifts ground present described target and estimate, and in phase present masking signal at user's Liang Erchu, estimate.
The spectral characteristic that described signal separation unit can be configured to known audio signal in the field based on reducing at noise provides estimation.Yet, according to described new method, in the output presenting to user, do not suppress described masking signal and estimate; But, as above openly to improve the mode of user's SRT, to user, present target estimation and masking signal estimation.
The statistical property that described signal separation unit can be configured to known audio signal in the field based on reducing at noise provides estimation.Yet, according to described new method, in the output presenting to user, do not suppress described masking signal and estimate; But, to improve the mode of user's SRT, to user, present target estimation and masking signal estimation.
Described signal separation unit can comprise Beam-former, and the described microphone audio signal that described Beam-former can be configured to based on described the first and second hearing aidss provides described estimation.The described Beam-former of described signal separation unit and traditional different being of Beam-former: in the output presenting to user, do not suppress described masking signal and estimate; But, to improve the mode of user's SRT, to user, present target estimation and masking signal estimation.
Described Beam-former is combined as the microphone audio signal of being exported by a plurality of microphones the echo signal for the sound source on the different directions with respect to a plurality of microphones with different sensitivity.Run through the disclosure, as the curve of the sensitivity of the variation of the function of direction, be represented as directional diagram.Conventionally, directional diagram has at least one direction that wherein microphone signal is cancelled out each other substantially.Run through the disclosure, such direction be represented as short side to.Directional diagram can according to the quantity of the microphone in described a plurality of microphones and according to signal process comprise several short sides to.
Described Beam-former can be the fixed beam former with the directional diagram fixing with respect to user's head.Described Beam-former can be for example based at least two microphones, and described at least two microphones have the forward direction user, that is, user's forward-looking direction have maximum and in the opposite direction, be in user backward, to there is the directional diagram of null value.
Described Beam-former can be based on surpassing two microphones, and can comprise the microphone of two hearing aidss that use wireless or cable communicating technology.The distance increasing between microphone can be utilized to form the directional diagram with narrow wave beam, for providing target estimation separated with the space of the improvement of masking signal estimation.The tradition output of described Beam-former can be used as target to be estimated, and can by the microphone audio signal of a microphone from a plurality of microphones, deduct target and estimate to provide described masking signal to estimate.
When the microphone of two hearing aidss of binaural hearing aid system and described Beam-former cooperation, the corresponding microphone signal of must substantially synchronously sampling.The time shift of the little 20-30 of the reaching microsecond between the sampling instant of the corresponding microphone signal in two hearing aidss can cause the appreciable displacement on beam direction.And the time shift inevitably occurring if operate asynchronously hearing aids, the time lentamente between the sampling instant of corresponding microphone signal changes seems drift and focuses on the sound wave beam on alternating direction causing.
Therefore, the hearing aids of binaural hearing aid system can be by synchronously, as for example disclosed in more detail in WO02/07479.
Described Beam-former can comprise sef-adapting filter, and described sef-adapting filter is configured to filter corresponding microphone audio signal, and the corresponding filter coefficient forming for adaptive beam is adapted to sound source.For example, described Beam-former can be adapted to optimize signal to noise ratio.
Beam-former that can be adaptive makes likely when the user of hearing aid device system is moving, to focus on mobile sound source or focus on not mobile sound source.And, can be adapted to the change in acoustic environment by adaptive Beam-former, the movement such as the disappearance of appearance, masking signal or the noise source of new sound source or masking signal or noise source with respect to the user of hearing aid device system.
Can the signal receiving at least one microphone place can be modeled as echo signal from predeterminated target direction add shelter or the supposition of the combination of noise under design adaptive beam former:
y
i(n)＝h
i(n)*s(n)+v
i(n)
Wherein, h
i(n) be from the source of s emission signal s (n) to the impulse response of the sound transmission of i microphone, and v
i(n) be the masking signal at same microphone place.Described masking signal can form by direction noise with such as the noise of the other types of diffusion noise or babble noise.
Can determine adaptively filter coefficient by the optimization problem solving below:
Submit to
Can find adaptively the solution for this optimization with the numerical optimization algorithm of lowest mean square, recursive least-squares, steepest decline or other types.
Preferably, configure in the following manner described signal separation unit: the estimation of echo signal and the estimation of masking signal comprise the spatial cues of primary signal.Can by suitable microphone arrangement and/or microphone signal suitable pre-/reprocessing realizes this point.
Each hearing aids in described binaural hearing aid can have signal separation unit, makes can obtain the estimation of echo signal and the estimation of masking signal in each of described hearing aids, preferably has correct spatial cues.
Once determine target and masking signal estimation, presented described signal as above openly to improve the mode of user's SRT to user.
Described new binaural hearing aid system can comprise multichannel the first hearing aids, wherein, microphone audio signal is divided into a plurality of frequency channels.
Accordingly, can in each frequency channel of a plurality of frequency channels, provide or can in the frequency channel of one or more selections of a plurality of frequency channels, provide independent echo signal to estimate and masking signal estimation, or, can provide one or more corresponding group of one or more echo signals estimations and the masking signal estimation frequency channel for the selection of a plurality of frequency channels, or can provide an echo signal to estimate and masking signal estimation by all frequency channels based on a plurality of frequency channels.
Described a plurality of frequency channel can comprise the frequency channel of distortion, and for example, all frequency channels can be the frequency channels of distortion.
Described new binaural hearing aid system can provide the circuit using according to the conventional method of other hearing loss compensation in addition, and described new circuit or other traditional circuits can be selected to for the suitable operation of the acoustic environment dissimilar.Different acoustic environments can comprise voice, multiple crosstalk, restaurant brouhaha, music, traffic noise etc.
Described new binaural hearing aid system can for example comprise digital signal processor (DSP), and its processing is controlled by selectable signal processing algorithm, and each of described algorithm has the various parameters of processing for adjusting performed actual signal.Gain in each frequency channel of multichannel hearing aids is the example of such parameter.
One in selectable signal processing algorithm operates according to described new method.
For example, can provide various algorithms for traditional noise suppressed, that is, and the decay of signal and the amplification of echo signal of less desirable or noise.
The microphone audio signal obtaining from different acoustic environments can have very different characteristics, for example average and maximum sound pressure level (SPL) and/or frequency content.Therefore, the acoustic environment of every type can be associated with specific program, and wherein, the specific setting of the algorithm parameter of signal processing algorithm provides the sound of the processing of the optimum signal quality in specific sound environment.One group of such parameter can typically comprise that the parameter relevant to the slope of wideband gain, angular frequency or frequency selective filter algorithm and control example are as the compression ratio of automatic gain control (AGC) algorithm and the parameter of flex point.
During can the initial matching session in assignment person's office, determine each signal treatment characteristic of described algorithm, and described signal treatment characteristic is programmed in the nonvolatile storage in new binaural hearing aid system.
Described new binaural hearing aid system can have user interface, such as the button of hearing aids shell, diverter switch etc. or remote controller, make the user of described new binaural hearing aid system can select in obtainable signal processing algorithm, to obtain the hearing loss compensation of the expectation in the acoustic environment of being discussed.
Described new binaural hearing aid system can be automatically in a plurality of sound environment classification by user's sound environment classification, such as voice, multiple crosstalk, restaurant brouhaha, music, traffic noise etc., and can therefore automatically select proper signal Processing Algorithm as known in the art.
Accompanying drawing explanation
Below, be described in greater detail with reference to the attached drawings the preferred embodiments of the present invention, in the accompanying drawings:
Fig. 1 schematically illustrates exemplary new hearing aids,
Fig. 2 illustrates the curve of the masking signal of frequency displacement,
Fig. 3 illustrates another curve of the masking signal of frequency displacement,
Fig. 4 illustrates the target of band pass filter and bandpass filtering and the curve of masking signal,
Fig. 5 schematically illustrates exemplary new binaural hearing aid system,
Fig. 6 schematically illustrates exemplary new binaural hearing aid system,
Fig. 7 schematically illustrates the signal separation unit with adaptive beam former based on two microphones,
Fig. 8 schematically illustrates the signal separation unit based on four microphones, and
Fig. 9 schematically illustrates exemplary new binaural hearing aid system.
Below with reference to accompanying drawing, more fully describe the present invention, in the accompanying drawings, exemplary embodiment of the present invention is shown.Yet the present invention can be implemented with different forms, and should not be construed as limited to embodiment set forth herein.But these embodiment are provided and make the disclosure is thorough and complete, and will pass on all sidedly scope of the present invention to those skilled in the art.Run through everywhere, similar drawing reference numeral is indicated similar element.Therefore, will with respect to each the description of the drawings, not describe similar element in detail.
Embodiment
Fig. 1 schematically illustrates the example of new binaural hearing aid 10, and these binaural hearing aid 10 operations utilize the ability concentrating in echo signal of people's auditory system to strengthen echo signal.
In illustrated new hearing aids 10, by eardrum export target signal and the masking signal to the user of binaural hearing aid in different frequency bands, improve the intelligibility of speech.
By this way, by signal being separated to different frequency bands, reduce to shelter by present the energy that echo signal and masking signal cause simultaneously.
Illustrate, for the language as echo signal with as the Gaussian noise of masking signal, can obtain for the listener with normal hearing the improvement of the SRT of 15dB, and for the impaired listener of the sense of hearing, obtain the improvement of the SRT of approximate 10dB.
In the situation that do not remove a part for signal, obtain this improvement; But the eardrum to user presents target and masking signal in the following manner: the auditory system of user's auditory system can be carried out natural noise and reduce, and echo signal is separated with masking signal.
Illustrated new hearing aids 10 comprises microphone 14, for the sound in response to receiving at microphone 14 places, provides microphone audio signal 18.In the corresponding prefilter (not shown) that microphone audio signal 18 can be known in the art, by pre-filtering, and be imported into signal separation unit 12.
The hearing loss processor 46 that is configured in known hearing loss compensation in the field of hearing aids is treated to hearing loss compensating audio signal 34 by the combination 32 of the echo signal 26 of the estimation of being revised by frequency modification unit 52 and the masking signal 30 estimated, and output transducer 48, be receiver 48 in the example shown, the output of hearing loss processor 46 34 be converted to the voice output signal sending to the eardrum of wearing the user of hearing aids 10.
Further or as an alternative, frequency modification unit 52 can be configured to determine respectively pitch and the overtone of the estimation of echo signal 26 and the estimation of masking signal 30, and in the estimation of the estimation of frequency displacement echo signal 26 and masking signal 30 one, makes between the pitch of frequency shift signal and corresponding pitch and overtone that overtone resides in another signal shown in Fig. 3.
Further or as an alternative, frequency modification unit 52 can comprise bank of filters as shown in Figure 4, and frequency modification unit 52 can be configured to utilize the estimation of the band division filter echo signal of the estimation be assigned to echo signal 26, and utilize the estimation that is assigned to other band division filter masking signals 30 that the estimation of masking signal 30 distributes.
This bank of filters can be tuned to the auditory filter that is intended to user.
By this way, improved the ability of the voice of user's understanding in noise.
This masking signal can be background sound, restaurant brouhaha, music (when voice are echo signal), traffic noise etc.
The spectral characteristic that signal separation unit 12 can be configured to based on known audio signal in the field of reducing noise provides estimation.Yet, according to new method, in the output presenting to user, do not suppress masking signal and estimate; But, to improve the mode of user's SRT, to user, present target estimation and masking signal estimation.
The statistical property that signal separation unit 12 can be configured to based on known audio signal in the field of reducing noise provides estimation.Yet, according to new method, in the output presenting to user, do not suppress masking signal and estimate; But, to improve the mode of user's SRT, to user, present target estimation and masking signal estimation.
This Beam-former can be the fixed beam former with the directional diagram fixing with respect to user's head.This Beam-former can be for example based at least two microphones, and described at least two microphones have the forward direction user, user's forward-looking direction have maximum and in the opposite direction, be in user backward, to there is the directional diagram of null value.
This Beam-former can be based on surpassing two microphones.The tradition output of this Beam-former can be used as target to be estimated, and can by the microphone audio signal of a microphone from a plurality of microphones, deduct target and estimate to provide this masking signal to estimate.
This Beam-former can comprise sef-adapting filter, and it is configured to filter corresponding microphone audio signal, and the corresponding filter coefficient forming for adaptive beam is adapted to sound source.For example, described Beam-former can be adapted to optimize signal to noise ratio.
As mentioned above, filter wave beam that can be adaptive makes likely when the user of hearing aid device system is moving, to focus on mobile sound source or focus on not mobile sound source.And, can be adapted to the change in acoustic environment by adaptive Beam-former, the movement such as the disappearance of appearance, masking signal or the noise source of new sound source or masking signal or noise source with respect to the user of hearing aid device system.
Preferably, configure in the following manner this signal separation unit: the estimation of echo signal and the estimation of masking signal comprise the spatial cues of primary signal.Can by suitable microphone arrangement and/or microphone signal suitable pre-/reprocessing realizes this point.
Once determine target and masking signal estimation, presented this signal to improve the mode of user's SRT to user.
This new hearing aids 10 can be multichannel hearing aids, wherein, microphone audio signal is divided into a plurality of frequency channels.
Accordingly, can in each frequency channel of a plurality of frequency channels, provide or can in the frequency channel of one or more selections of a plurality of frequency channels, provide independent echo signal to estimate and masking signal estimation, or can provide one or more corresponding group of one or more echo signals estimations and the masking signal estimation frequency channel for the selection of a plurality of frequency channels, or can provide an echo signal to estimate and masking signal estimation by all frequency channels based on a plurality of frequency channels.
The plurality of frequency channel can comprise the frequency channel of distortion, and for example, all frequency channels can be the frequency channels of distortion.
This new hearing aids 10 can provide the circuit 46 using according to the conventional method of other hearing loss compensation in addition, and this new circuit or other traditional circuits can be selected to for the suitable operation of the acoustic environment dissimilar.Different acoustic environments can comprise voice, multiple crosstalk, restaurant brouhaha, music, traffic noise etc.
This new hearing aids 10 can for example comprise digital signal processor (DSP), and its processing is controlled by selectable signal processing algorithm, and each of this algorithm has the various parameters of processing for adjusting performed actual signal.Gain in each frequency channel of multichannel hearing aids is the example of such parameter.
One in selectable signal processing algorithm operates according to disclosed signal Enhancement Method.
For example, can provide various algorithms for traditional noise suppressed, i.e. the decay of signal and the amplification of echo signal of less desirable or noise.
The microphone audio signal obtaining from different acoustic environments can have very different characteristics, for example average and maximum sound pressure level (SPL) and/or frequency content.Therefore, the acoustic environment of every type can be associated with specific program, and wherein, the specific setting of the algorithm parameter of signal processing algorithm provides the sound of the processing of the optimum signal quality in specific sound environment.One group of such parameter can typically comprise that the parameter relevant to the slope of wideband gain, angular frequency or frequency selective filter algorithm and control example are as the compression ratio of automatic gain control (AGC) algorithm and the parameter of flex point.
During can the initial matching session in assignment person's office, determine each signal treatment characteristic of this algorithm, and this signal treatment characteristic is programmed in the nonvolatile storage in new binaural hearing aid system.
This new binaural hearing aid 10 can have user interface, such as the button of hearing aids shell, diverter switch etc. or remote controller, make the user of this new binaural hearing aid system can select in obtainable signal processing algorithm, to obtain the hearing loss compensation of the expectation in the acoustic environment of being discussed.
This new hearing aids 10 can be automatically in a plurality of sound environment classification by user's sound environment classification, such as voice, multiple crosstalk, restaurant brouhaha, music, traffic noise etc., and can therefore automatically select proper signal Processing Algorithm as known in the art.
Fig. 5 illustrates the new binaural hearing aid system 10 with the first and second hearing aids 10A, 10B.The second hearing aids 10B has receiver 48B and transceiver (not shown), transceiver for receive from the first hearing aids 10A by wired or wireless transmission the input signal to receiver 48B.Therefore, in the example shown, by the first hearing aids 10A, control the acoustics output signal by the second hearing aids 10B transmitting.
The first hearing aids 10A comprises a microphone 14, for the sound in response to receiving at microphone 14 places, provides microphone audio signal 18.In the corresponding prefilter (not shown) that microphone audio signal 18 can be known in the art, by pre-filtering, and be imported into signal separation unit 12.The microphone audio signal 18 of the pre-filtering of signal separation unit 12 based on possible provides the estimation of echo signal 26 and the estimation of masking signal 30, and to frequency modification unit 52 output estimations.
The frequency content of the estimation of frequency modification unit 52 modifying target signals 26 and masking signal 30, makes the echo signal 26 of output estimation and the masking signal 30 of estimation in different frequency bands substantially, for example, respectively as shown in Fig. 2-4.
In first adder 42, the estimation of echo signal 26 is added to the estimation of masking signal 30, its at least one by frequency modification, and output and be imported into output transducer 48, output transducer 48 is converted to the output of first adder 42 the acoustics output signal sending to the eardrum of wearing the user of binaural hearing aid system 10.
And, in second adder 50, estimation and 180 ° of estimations that deduct accordingly echo signal 26 of phase shift from masking signal 30, its at least one by frequency modification, and the output of second adder 50 is sent to output transducer 48B, to be converted to acoustics output signal, this acoustics output signal is sent by another eardrum to wearing the user of binaural hearing aid system 10.By this way, BMLD and SRT have been improved.
Can exchange the estimation of echo signal 26 and the estimation of masking signal 30, before in being presented to user's eardrum one of the estimation that makes masking signal 20, be phase-shifted 180 °, substitute the phase shift of the estimation of echo signal 26.The BMLD obtaining by this way and the improvement on SRT are less than by the improvement of the phase shift acquisition of the estimation of echo signal 26.
At the new binaural hearing aid system 10 shown in Fig. 6, be similar at the hearing aid device system shown in Fig. 5, except the following fact: the microphone audio signal 18B by the microphone 14B output in the second hearing aids 10B is sent to the first hearing aids 10A by wired or wireless transmission, and be imported into signal separation unit 12, so that signal separation unit 12 can for example form by the estimation of the estimation of echo signal and masking signal 30 microphone audio signal 18, the 18B based on two possible pre-filterings by wave beam as discussed further below.When user wears the first and second hearing aids 10A and 10B in the first and second hearing aids 10A at user's corresponding ear place and position that 10B is intended to, relatively large distance between microphone 14,14B makes likely to form narrow beam, and therefore allows echo signal separated with the good space of masking signal.
The frequency content of the estimation of frequency modification unit 52 modifying target signals 26 and masking signal 30, makes the echo signal 26 of output estimation and the masking signal 30 of estimation in different frequency bands substantially, for example, respectively as shown in Fig. 2-4.
In first adder 42, the estimation of echo signal 26 is added to the estimation of masking signal 30, its at least one by frequency modification, and output and be imported into output transducer 48, output transducer 48 is converted to the output of first adder 42 the acoustics output signal sending to the eardrum of wearing the user of binaural hearing aid system 10.
And, in second adder 50, from estimation and 180 ° of frequency displacements that deduct accordingly echo signal 26 of phase shift of masking signal 30, estimate, its at least one by frequency modification, and the output of second adder 50 is sent to output transducer 48B, to be converted to acoustics output signal, this acoustics output signal is sent by another eardrum to wearing the user of binaural hearing aid system 10.By this way, BMLD and SRT have been improved.
Can exchange the estimation of echo signal 26 and the estimation of masking signal 30, before in being presented to user's eardrum one of the estimation that makes masking signal 20, be phase-shifted 180 °, substitute the phase shift of the estimation of echo signal 26.The BMLD obtaining by this way and the improvement on SRT are less than by the improvement of the phase shift acquisition of the estimation of echo signal 26.
Time domain, frequency spectrum and/or statistical property that signal separation unit 12 can be configured to based on microphone audio signal provide estimation, as known in reduced in field at noise.Alternatively, can further process to the corresponding signal application before being input to corresponding receiver 48,48B, for example, for the hearing loss compensation of corresponding signal.
Fig. 7 schematically illustrates the digital signal separative element 12 that comprises the adaptive beam former 10 with two microphones 14,16.
Before wave beam forms in traditional prefilter 22,24 pre-filtering microphone audio signal 18,20. Microphone audio signal 18,20 can be by the digitlization of analog to digital converter (not shown) before or after prefilter 22,24.Signal before pre-filtering and afterwards and before analog-to-digital conversion and afterwards is all turned to microphone audio signal by term.
The output 26 of the first subtracter 28 is used adaptive beam to form the estimation that produces echo signal from the target direction of supposition.The estimation of echo signal 26 is presented in user's two ears subsequently, and with contrary phase place, is presented to another in user's two ears.The output 30 of sef-adapting filter 32 of filtering the output of the second subtracter 34 produces masking signals and estimates to be presented to subsequently user's two ears.
By following formula, provide the input X of the first microphone 14
1(n):
x
1(n)＝h
1(n)*s(n)+g
1(n)*q(n)
Wherein, h
1(n) be from the source of s emission signal s (n) to the impulse response of the sound transmission of the first microphone 14, and g
1(n) be from the masking signal source of the q that transmits (n) to the impulse response of the sound transmission of the first microphone 14.
By following formula, provide the input X of second microphone 16
2(n):
x
2(n)＝h
2(n)*s(n)+g
2(n)*q(n)
Wherein, h
2(n) be from the source of s emission signal s (n) to the impulse response of the sound transmission of second microphone 16, and g
2(n) be from the masking signal source of the q that transmits (n) to the impulse response of the sound transmission of second microphone 16.
Then, the output 26 of echo signal equals h
1(n) output 30 that * s (n), and masking signal estimates equals g
1(n) * q (n).
Fig. 8 schematically illustrates the signal separation unit 12 based on four microphones 14,16,14B, 16B, two 14,16 in microphone are arranged in the first hearing aids 10A, and its two other (not shown) 14B, that 16B is arranged in the second hearing aids 10B(is not shown).
Can utilize the distance of the increase between microphone to form the directional diagram with narrow beam, to provide the target of improvement to estimate that the space of estimating with masking signal is separated.The tradition output of Beam-former can be used as target to be estimated, and can by the microphone audio signal of a microphone from a plurality of microphones, deduct target and estimate to provide masking signal to estimate.
In the corresponding prefilter 22,24 being known in the art, by microphone audio signal 18,20 pre-filterings of two microphones 22,24 of the first hearing aids 10, be microphone audio signal y
1(n), y
2, and be entered into corresponding sef-adapting filter a (n)
1(n), a
2(n).
The second hearing aids 10B(is not shown) two microphone 14B, 16B(not shown) the microphone audio signal of pre-filtering be encoded for not shown at the second hearing aids 10B() in transmission, and be used wireless or cable data transmission and send to the first hearing aids 10A.Two microphone 14B, 16B(representing the second hearing aids 10B are not shown) the transmission data of microphone audio signal by the transceiver 36 of the first hearing aids 10A, received, and in decoder 38, be decoded as two microphone audio signal y
3(n), y
4, and be imported into corresponding sef-adapting filter a (n)
3(n), a
4(n).
Sef-adapting filter a
1(n), a
2(n), a
3(n), a
4(n) be configured to the corresponding microphone audio signal y of filtering
1(n), y
2(n), y
3(n), y
4(n), and by the respective filter coefficient forming for adaptive beam be adapted to sound source.
Filter a that can be adaptive
1(n), a
2(n), a
3(n), a
4(n) make likely when the user of hearing aid device system is moving, to focus on mobile sound source or focus on not mobile sound source.And, filter a that can be adaptive
1(n), a
2(n), a
3(n), a
4(n) can be adapted to the change in acoustic environment, the movement such as the disappearance of appearance, masking signal or the noise source of new sound source or masking signal or noise source with respect to the user of hearing aid device system.
Can be modeled as under the supposition of combination that echo signal from predeterminated target direction adds noise and design adaptive beam former filter a at the signal receiving at least one microphone 14,16,14B, 16B place
1(n), a
2(n), a
3(n), a
4(n):
y
i(n)＝h
i(n)*s(n)+v
i(n)
Wherein, h
i(n) be from the source of s emission signal s (n) to the impulse response of the sound transmission of i microphone, and v
i(n) be the noise signal at same microphone place.Described masking signal can form by directivity masking signal or noise with such as masking signal or the noise of the other types of diffusion noise or babble noise.
Can determine adaptively filter coefficient by the optimization problem solving below:
Submit to
Preferably use lowest mean square (LMS) method, more preferably use standardized lowest mean square (NLMS) method to carry out filter adaptation; Yet, also can use other algorithms, such as the numerical optimization algorithm of recursive least-squares, steepest decline or other types.
In adder 34, be added sef-adapting filter a
1(n), a
2(n), a
3(n), a
4(n) output, and the output 26 of adder 34 forms the estimation of echo signal
The estimation of subtracter 28 output masking signals:
Once determine target and masking signal estimation, presented this signal to improve the mode of user's SRT to user, as schematically illustrated in Fig. 7.
Fig. 9 illustrates the example of new binaural hearing aid system 10.
This new binaural hearing aid system 10 has the first and second hearing aids 10A, 10B, and they have transceiver 36,36B for the data communication between two hearing aids 10A, 10B.The first hearing aids 10A comprises at least one microphone, and it has two microphones 14,16, for the sound in response to receiving at corresponding microphone 14,16 places, provides microphone audio signal 18,20.In the corresponding prefilter 22,24 that microphone audio signal 18,20 is known in the art, by pre-filtering, be microphone audio signal, and be imported into signal separation unit 12.In Fig. 8, illustrate in greater detail and described signal separation unit 12 above with reference to Fig. 8.
The second hearing aids 10B also comprises at least one microphone, and it has two microphone 14B, 16B, for the sound in response to receiving at corresponding microphone 14B, 16B place, provides microphone audio signal 18B, 20B.The prefilter 22B that microphone audio signal 18B, 20B are known in the art, 24B pre-filtering.Then, the microphone audio signal of the pre-filtering of two microphone 22B, 24B is encoded in codec 40B, to use Wireless Data Transmission to send to the first hearing aids 10A.The transmission data that represent the microphone audio signal of the second hearing aids 10B are received by the transceiver 36 of the first hearing aids 10A, and in decoder 38, are decoded as two microphone audio signals that are imported into as above with reference to the signal separation unit 12 described in figure 8.
The microphone audio signal that signal separation unit 12 is configured to the pre-filtering based on the first and second hearing aids 10A, 10B provides the estimation of echo signal 26 and the estimation of masking signal 30.
Make the likely Beam-former of configuration signal separative element 12 with the relative large distance between the microphone of independent hearing aids 10A, 10B of comparing in the distance between the microphone of single hearing aids, referring to Fig. 8, narrow beam directional diagram provides, and the estimation of echo signal 26 is separated with the space of the improvement of the estimation of masking signal 30.The tradition output of Beam-former is used as the estimation of echo signal 26, and the estimation that deducts echo signal 26 of the microphone audio signal of the pre-filtering by a microphone from a plurality of four microphones 14,16,14B, 16B provides the estimation of masking signal 30.
Once determine target and masking signal estimation, presented signal to improve the mode of user's SRT to user.In first adder 42, the estimation of echo signal 26 is added to the estimation of masking signal 30, its at least one by frequency modification, and the output of the estimation of the estimation of echo signal 26 and masking signal 30 and in delayer 44, be delayed, and be imported into signal processor 46 and compensate for hearing loss.Delayer 44 maintains the relative phase of the expectation of the signal of being exported by the first and second hearing aids 10A, 10B respectively.
And, in second adder 50, from estimation and 180 ° of estimations that deduct accordingly echo signal 26 of phase shift of masking signal 30, its at least one by frequency modification, and the output of second adder 50 is encoded in codec 40, to send to the second hearing aids 10B by transceiver 36.In the second hearing aids 10B, transmission and by transceiver 36B, received, and decoded by decoder 38B, and be imported into signal processor 46B and compensate for hearing loss.Output transducer 48B, is receiver 48B in the example shown, and the output of signal processor 46B is converted to acoustics output signal, and this acoustics output signal is sent by the eardrum to wearing the user of binaural hearing aid system 10.By this way, can user's SRT be improved up to 20dB according to acoustic environment.
Can exchange the estimation of echo signal 26 and the estimation of masking signal 30, before in being presented to user's eardrum one of the estimation that makes masking signal 20, be phase-shifted 180 °, substitute the phase shift of echo signal 26.The improvement in SRT obtaining is by this way less than by the improvement of the phase shift acquisition of the estimation of echo signal 26.
Claims (17)
1. a hearing aids (10), comprising:
At least one microphone (14,16), for providing at least one microphone audio signal (18,20) in response to locate the sound receiving at described at least one microphone (14,16),
Signal separation unit (12), being configured to provides the estimation of echo signal (26) and the estimation of masking signal (30) based on described at least one microphone audio signal (18,20),
Frequency modification unit (52), be configured to revise at least one the frequency content in the estimation of described echo signal (26) and described masking signal (30), make when the processing by described frequency modification unit (52), substantially in different frequency bands, export estimated echo signal (26) and estimated masking signal (30)
Receiver (48), for being revised by described frequency modification unit (52) and the estimation of described echo signal (26) of output and the Combination conversion of the estimation of described masking signal (30) are will be to the acoustic signal of a transmission of the user's of described binaural hearing aid system (10) eardrum.
2. a binaural hearing aid system (10), comprising:
The first hearing aids according to claim 1 (10A), and
The second hearing aids (10B), comprises at least one microphone (14B, 16B), for corresponding at least one microphone audio signal (18B, 20B) is provided in response to locate the sound receiving at described at least one microphone (14B, 16B), and wherein
Transceiver (36B) in described the second hearing aids (10B) is connected to for send the signal that represents described at least one microphone audio signal (18B, 20B) to described the first hearing aids (10A), and wherein
Transceiver (36) in described the first hearing aids (10A) is connected to for receiving the signal of described at least one microphone audio signal (14B, 16B) that represents described the second hearing aids (10B), and wherein
Described signal separation unit (12) is configured to based on described the first and second hearing aids (10A, described at least one microphone audio signal (18 10B), 20,18B, 20B) estimation of described echo signal (26) and the estimation of described masking signal (30) be provided.
3. binaural hearing aid system according to claim 1 and 2 (10), wherein, described frequency modification unit (52) is configured to:
By a frequency displacement in the estimation of the estimation of described echo signal (26) and described masking signal (30) in another the frequency field wherein substantially not existing in the estimation of described echo signal (26) and the estimation of described masking signal (30).
4. binaural hearing aid system according to claim 1 and 2 (10), wherein, described frequency modification unit (52) is configured to:
Determine respectively pitch and the overtone of the estimation of described echo signal (26) and the estimation of described masking signal (30), and
In the estimation of the estimation of echo signal described in frequency displacement (26) and described masking signal (30) one, makes between the pitch and corresponding pitch and overtone that overtone resides in another signal of signal of institute's frequency displacement.
5. binaural hearing aid system according to claim 1 and 2 (10), wherein, described frequency modification unit (52) comprising:
Bank of filters, and wherein, described frequency modification unit (52) is configured to utilize the estimation of echo signal (26) described in the band division filter of the estimation that is assigned to described echo signal (26), and
Utilization is assigned to the estimation of masking signal (30) described in other band division filters of estimation of described masking signal (30).
6. binaural hearing aid system according to claim 5 (10), wherein, described bank of filters is tuned to the auditory filter that is intended to user.
7. according to the binaural hearing aid system (10) described in any one of preceding claim, further comprise:
Phase-shift circuit (54), is configured to another phase shift in the estimation of estimation with respect to described echo signal (26) in the estimation of the estimation of described echo signal (26) and described masking signal (30) and described masking signal (30).
8. according to the binaural hearing aid system (10) described in any one of preceding claim, wherein, the spectral characteristic that described signal separation unit (12) is configured to based on described audio signal provides described estimation.
9. according to the binaural hearing aid system (10) described in any one of preceding claim, wherein, the statistical property that described signal separation unit (12) is configured to based on described audio signal provides described estimation.
10. according to the binaural hearing aid system (10) described in any one of preceding claim, wherein, described signal separation unit (12) comprises Beam-former.
11. according to the binaural hearing aid system (10) described in claim 2 and 10, and wherein, the microphone audio signal (18,20,18B, 20B) that described Beam-former is configured to based on described the first and second hearing aidss (10A, 10B) provides described estimation.
12. according to the binaural hearing aid system described in claim 10 or 11 (10), wherein, described Beam-former comprises sef-adapting filter, described sef-adapting filter is configured to filter corresponding microphone audio signal, and by corresponding filter coefficient be adapted for minimize described filter output signal and.
13. 1 kinds of methods that the signal in hearing aids (10) strengthens, described method comprises step:
At least one microphone audio signal (18,20) is provided in response to sound, and
Based on described at least one audio signal (18,20), provide the estimation of echo signal (26) and the estimation of masking signal (30),
At least one in the estimation of the estimation of echo signal (26) and described masking signal (30) described in frequency modification in the following manner: after modification, the estimation of the estimation of described echo signal (26) and described masking signal (30) resides in different frequency bands substantially, and
To a combination that is sent in the estimation of amended described echo signal (26) and the estimation of described masking signal (30) in the user's of described hearing aids (10) eardrum.
The method that 14. signals according to claim 13 strengthen, comprises step:
In response to the sound receiving at ears, at user's ears place, provide at least one microphone audio signal (18,20,18B, 20B), and
Described microphone audio signal (18,20,18B, 20B) based at ears place provides the estimation of in described echo signal (26) and described masking signal (30).
15. methods that strengthen according to the signal described in any one of claim 13 or 14, comprise step: based on described microphone audio signal, come wave beam to form.
The method that 16. signals according to claim 14 strengthen, comprises step: by corresponding filter coefficient is adapted for minimize adaptation filtering output signal and carry out microphone audio signal described in adaptive-filtering.
17. methods that strengthen according to the binaural signal described in any one of claim 13-16, further comprise step:
By another phase shift in the estimation of estimation with respect to described echo signal (26) in the estimation of the estimation of described echo signal (26) and described masking signal (30) and described masking signal (30).
Applications Claiming Priority (6)
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|---|---|---|---|
| EP11196247.8 | 2011-12-30 | ||
| EP11196247.8A EP2611215B1 (en) | 2011-12-30 | 2011-12-30 | A hearing aid with signal enhancement |
| EP12175247.1 | 2012-07-06 | ||
| DKPA201270402 | 2012-07-06 | ||
| EP20120175247 EP2683179B1 (en) | 2012-07-06 | 2012-07-06 | Hearing aid with frequency unmasking |
| DKPA201270402 | 2012-07-06 |
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