阅读说明：本技术 用于运行助听器的方法 (Method for running hearing aid ) 是由 M.阿诺德 S.佩特劳施 于 2019-05-16 设计创作，主要内容包括：本发明涉及一种用于运行助听器(1)的方法,其中由助听器(1)的至少一个输入转换器(10)产生输入信号(32),其中根据输入信号(32)借助信号处理(34)产生初步输出信号(36),其中根据输入信号(32)确定在助听器(1)的用户的听觉器官(16)处预期的直接声音(24′),其中确定初步输出信号(36)相对于预期的直接声音(24′)的传播延迟(Δ),其中根据输入信号(32)和/或初步输出信号(36)在考虑预期的直接声音(24′)和/或初步输出信号(36)相对于预期的直接声音(24′)的传播延迟(Δ)的情况下产生掩蔽信号(44),并且其中根据初步输出信号(36)和掩蔽信号(44)产生输出信号(50)。(The present invention relates to a kind of methods for running hearing aid (1), input signal (32) are wherein generated by least one input converter (10) of hearing aid (1), preliminary output signal (36) are wherein generated by signal processing (34) according to input signal (32), wherein according to input signal (32) determine at the hearing organ (16) of the user of hearing aid (1) expected from direct voice (24 '), wherein determine the propagation delay (Δ) of preliminary output signal (36) relative to expected direct voice (24 '), wherein produced according to input signal (32) and/or preliminary output signal (36) in the case where considering propagation delay (Δ) of expected direct voice (24 ') and/or preliminary output signal (36) relative to expected direct voice (24 ') Raw masking signal (44), and output signal (50) are wherein generated according to preliminary output signal (36) and masking signal (44).)

1. method of the one kind for running hearing aid (1), wherein being generated by least one input converter (10) of hearing aid (1) Input signal (32),

Preliminary output signal (36) are wherein generated by signal processing (34) according to input signal (32),

Wherein according to input signal (32) determine at the hearing organ (16) of the user of hearing aid (1) expected from direct voice (24 '),

Wherein determine the propagation delay (Δ) of preliminary output signal (36) relative to expected direct voice (24 '),

Wherein according to input signal (32) and/or preliminary output signal (36) in the expected direct voice (24 ') of consideration and/or just Masking signal is generated in the case where propagation delay (Δ) of the step output signal (36) relative to expected direct voice (24 ') (44), and

Output signal (50) are wherein generated according to preliminary output signal (36) and masking signal (44).

2. according to the method described in claim 1, wherein determining the width of expected direct voice (24 ') according to input signal (32) Degree spectrum, and

The wherein amplitude spectrum according to the previously given masking signal of amplitude spectrum (44) of expected direct voice (24 ').

3. according to the method described in claim 2, wherein the nonzero value of the amplitude spectrum of masking signal (44) is substantially by expected The amplitude spectrum of direct voice (24 ') provides.

4. according to claim 2 or method as claimed in claim 3, wherein determine the amplitude spectrum of preliminary output signal (36), and And the amplitude spectrum of the previously given masking signal of amplitude spectrum (44) according further to preliminary output signal (36).

5. according to the method described in claim 4, the wherein amplitude spectrum of previously given masking signal (44) as follows, that is, The masking signal (44) substantially has the range value of non-zero only for such as lower frequency, for the frequency, according to preliminary defeated Signal (36) has by the output voice signal (14) that the output translator (12) of hearing aid (1) generates straight than expected out Connect the sound level between the low -6dB of sound (24 ') and the than expected high 12dB of direct voice (24 ').

6. the method according to any one of claim 2 to 5, wherein generating masking signal (44) as follows, that is, In Preliminary output signal (36) relative to expected direct voice (24 ') propagation delay 190% and 210% between select masking Delay of the range value of signal (44) relative to the corresponding range value of expected direct voice (24 ').

7. the method according to any one of claim 2 to 6, the range value of a portion masking signal (44) is according to pre- The range value of the phasing back of the direct voice (24 ') of phase is formed.

8. method according to any one of the preceding claims, wherein by the other input converter of hearing aid (1) (60) other input signal (62) is generated, wherein generating tentatively by signal processing (34) according to other input signal (62) Output signal (36) is used as phasing signal (66), and wherein according to input signal (32) and/or other input signal (62) And/or phasing signal (66) generates masking signal (44).

9. a kind of hearing aid (1), has

At least one input converter (10), for generating input signal (32),

The signal processing unit (34) being connect with input converter (10), for generating preliminary output according to input signal (32) Signal (36), and

At least one output translator (12) is used for reproducing output signals (50),

Wherein, signal processing unit (34) is designed to, for being passed through according to input signal (32) and preliminary output signal (36) Method described in any one of the claims generates output signal (50).

Technical field

The present invention relates to a kind of methods for running hearing aid, wherein being produced by least one input converter of hearing aid Raw input signal, wherein generating preliminary output signal by signal processing according to input signal, and wherein according to preliminary output Signal generates output signal.

Background technique

In the operation of hearing aid, the voice signal of environment is usually converted to electric signal by input converter, and It requires to arrange and enhance with being particularly depending on frequency herein according to the audiology of user in signal processing unit. Signal after arrangement is converted to output voice signal by output translator now, which is fed to listening for user Feel organ.Now here, in normal use hearing aid, following situation itself can be generated in operation, that is, when the sound of environment When signal reaches the hearing organ of user, the output voice signal of hearing aid is superimposed with the voice signal of environment.The original of this point Because particular in that, hearing aid is generally configured to the ear canal of incomplete closed user, to avoid user usually as interference The blocking effect of perception.For this purpose, aperture (venthole) can also be arranged in the shell of hearing aid if necessary.

Now, the input signal generated according to the voice signal of environment by input converter is special in signal processing unit It is that elapsed-time standards postpones during for band filter, which cannot be any by the technical measures of signal processing Reduce.This causes now, in hearing aid according to the output voice signal that the output signal of signal processing generates with it is small when Between postpone to be superimposed with the voice signal of environment.This leads to so-called comb filtering in total voice signal of user's perception as a result, Device effect.Due to the output voice signal of hearing aid be superimposed with direct environmental sound signal in time delay, according to the time Delay and frequency, each signal component constructive interference, this causes to enhance, and in contrast, it is whole for the half of time delay inverse The frequency of several times, since destructive interference may occur significantly decaying in total voice signal.Here, comb filter effect can Can perceived as it is very uncomfortable because comb filter effect is for example by eliminating specific frequency, due to cancellation Interference may seriously change the overtone spectrum of audible voice signal and/or comb filter effect may be in broadband noise " application " harmonic structure.

This comb filter effect especially works as direct voice signal with big with the output voice signal of hearing aid Appearance when causing identical volume.For the obvious louder frequency of a meeting in the two voice signals, the interference for User is difficult to perceive.It can attempt now, it is substantially same that two voice signals are minimized by the enhancing in signal processing The loud frequency range of sample.Particularly, in the case where many hearing losses, it usually needs more than about 1kHz frequency Output signal carries out significant signal enhancing, so that sound accounts for obvious dominate directly below in the frequency.Now by two The sharp increase that signal enhancing is executed in the range of the audible overlapping of voice signal, can reduce comb filter effect Spectrum width.However means that although still will appear comb filter effect in relatively narrow overlapping range, and furthermore exist Due to the dynamic compression executed in the signal processing generally directed to such case in the case where loud direct voice, possibility by To limitation.

Summary of the invention

Therefore, the technical problem to be solved by the present invention is to provide a kind of method for running hearing aid, pass through this method Comb filter effect can be avoided to make the uncomfortable consequence of user in a manner of as simple as possible, without significantly changing or The signal processing specific to user is not damaged completely.

The technical problem is solved by the method for running hearing aid according to the present invention, wherein extremely by hearing aid A few input converter generates input signal, wherein preliminary output signal is generated by signal processing according to input signal, It is middle that the expected direct voice at the hearing organ of the user of hearing aid is determined according to input signal, wherein determining preliminary output letter Propagation delay number relative to expected direct voice, wherein considering user according to input signal and/or preliminary output signal Hearing organ at expected direct voice and/or preliminary output signal relative to direct expected from the hearing organ of user at Masking signal is generated in the case where the propagation delay of sound, and output is wherein generated according to preliminary output signal and masking signal Signal.Advantageous and part is also illustrated in the following description is considered as creative scheme.

Preferably, according to input signal by depend on frequency and especially specific to user signal processing generate Preliminary output signal.Particularly, it generates preliminary output signal according to input signal to here mean that, by the signal of input signal point Amount is input in preliminary output signal, and the signal processing for other signal has therefore not only been determined according to input signal Parameter.Become here, the signal component of input signal also suffers from its dynamic change, spectral change or directional characteristic if necessary The influence of change.In addition to the information being itself contained in input signal, if necessary can also according to the form parameter of hearing aid and/ Or the ear canal of user determines the expected direct voice at the hearing organ of the user of hearing aid.Here, the determination process is special Being includes estimation.Preferably, output signal is converted to output voice signal by least one output translator of hearing aid, this is defeated Voice signal is output to the hearing organ of user out.

Here, preliminary output signal especially by without using according to the method for the present invention in the case where by the defeated of hearing aid The signal that converter is output to the hearing organ of user out provides.The generation of output signal is believed according to preliminary output signal and masking It number realizes, is realized herein especially by the described two signals of linear superposition.

Here, preliminary output signal relative to the propagation delay of desired direct voice determination especially can in advance into Row, or by calculating considering the waiting time occurred in the signal processing by the filter used there reality It is existing, or by reproducing the standardization measurement process realization for spreading the delay in test signal.

According to input signal and/or preliminary output signal, masking signal is preferably generated as follows, that is, as far as possible Compensate preliminary output signal in following signals component, the signal component at the hearing organ of the user of hearing aid with it is expected Direct voice leads to the audible comb filter effect of user together, prevent user is from perceiving this as artifact form The presence of masking signal.Because on the one hand the appearance of comb filter effect depends on expected direct voice itself, another party Face additionally depends on preliminary output signal, so herein in addition to the knowledge of input signal, and in addition in view of expected input signal The knowledge of preliminary output signal is also needed other than the knowledge of direct voice.It is used in the signal processing however, the knowledge passes through The knowledge of algorithm is directly presented, thus preliminary output signal for execute this method need not branch again, but especially from defeated Enter to export in signal needed for this method, the characteristics of signals knowledge of preliminary output signal.

Particularly, generate masking signal as follows: cause in the range of comb filter effect part signal eliminate, Destructive interference between expected direct voice and preliminary output signal, by it is opposite, with the constructive interference of masking signal come Compensation, and the constructive interference of expected direct voice and preliminary output signal is compensated by the destructive interference with masking signal.

Preferably, the amplitude spectrum that expected direct voice is determined according to input signal, wherein according to expected direct voice The previously given masking signal of amplitude spectrum amplitude spectrum.It can be considered to following situations: masking signal should compensate expected Direct voice, especially for avoiding comb filter effect.Since comb filter effect is along with special in amplitude spectrum Structure, i.e., along with the signal amplitude value described relative to frequency, therefore about corresponding compensation preferably by the width of masking signal Degree spectrum be tuned to expected direct voice.Here, the amplitude spectrum of expected direct voice is especially considering according to input signal It is determined in the case where the form parameter of hearing aid and/or the ear canal of user, wherein especially can be used by accordingly surveying Transmission function that amount is determining, that input signal is about expected direct voice.

Herein, it is preferable that the nonzero value of the amplitude spectrum of masking signal is substantially given by the amplitude spectrum of expected direct voice Out.It means that in the frequency range sheltered completely by masking signal, in addition to depend on the linear enhancing of frequency because Number, also provides the amplitude spectrum of the same masking signal by expected direct voice when necessary.Here, masking signal is set as zero Range can especially come according to the hearing loss of user previously given, or can also dynamically come according to input signal true It is fixed.

It determines the amplitude spectrum of preliminary output signal, and is covered according further to the amplitude spectrum of preliminary output signal is previously given The amplitude spectrum for covering signal is proved to be advantageous.This make it possible to especially consider in hearing aid signal processing for carrying out with In generating masking signal, because this point will not be changed if possible, so as to optimally compensate listening for the user of hearing aid Power loss, however particularly, it is contemplated that direct voice amplitude and the output voice signal that is generated according to preliminary output signal Ratio is conclusive for the formation of comb filter effect.

Preferably, the amplitude spectrum of previously given masking signal as follows herein, that is, masking signal substantially only for If lower frequency has the range value of non-zero, for the frequency, produced according to preliminary output signal by the output translator of hearing aid Raw output voice signal has the sound between the low -6dB of direct voice than expected and the than expected high 12dB of direct voice Grade.Here, masking signal only provides nonzero value in such as lower frequency range, in these frequencies, due to expected direct voice , generally speaking there is very big probability in the ratio with preliminary output signal or with the amplitude of resulting output voice signal It will form comb filter effect.That is, if one in two voice signals, i.e., expected direct voice or root The output voice signal generated according to preliminary output signal is obviously louder, is significantly greater than 10dB, then constructive interference and cancellation are dry Relate to it is just smaller so that the user of hearing aid cannot hardly or completely perceive the interference.In this case, at this It may dispense with corresponding masking signal in kind frequency range.

Particularly, when by hearing aid, there are high signal enhancings, and therefore preliminary output signal causes than expected Direct voice obviously louder output voice signal when, masking signal described in one side disappears in specific frequency model It is ensured that the desired characteristic of preliminary output signal, such as directionality or dynamic range not will receive the dry of masking signal in enclosing It disturbs.Although the latter in specific frequency range completely without.On the other hand, for the sound level of preliminary output signal and expection The masking signal of ratio of direct voice ensured in described range, (such as inhibited by interference noise or By using compression) in the of short duration variation of enhancing, and preliminary output signal thus along with variation in, always may be used To compensate this point.

In advantageous implementation, masking signal is generated as follows, that is, in preliminary output signal relative to expected direct Between the 190% of the propagation delay of sound and 210%, between preferably 195% and 205%, particularly preferably lucky 200%, selection Signal delay of the range value of masking signal relative to the corresponding range value of expected direct voice.By expected direct sound In the signal zero pole plot that sound and preliminary output signal are constituted, comb filter effect is eliminated by signal to be embodied, and signal is eliminated It is indicated by the zero point near unit circle.Here, the frequency eliminated has determined the Angle Position of zero point, and to the distance of unit round wires by Expected direct voice and the ratio of the amplitude of output voice signal determine.Here, output voice signal is according to preliminary output Signal generates.In this case, description below has the masking signal of the characteristic, that is, to be formed by voice signal Transmission function is added additional zero point and is preferably accurately occupied before the Angle Position of these zero points occupies formerly between zero point At each middle angle, and this zero point before causing is from unit circle line offset.This leads to significantly reducing for signal elimination.

Suitably, the range value of a part of masking signal is according to the range value shape of the phasing back of expected direct voice At.This especially should include, it is contemplated that the specific spectrum value of direct voice cause to have in the masking signal of inverted phase Corresponding spectrum value.It is possible thereby to particularly advantageously compensate expected direct voice.

For example, if the voice signal of sound source is provided by x (t), and the letter in direct voice path or hearing aid Number processing in the first approximation by scalar multiplication with coefficient D and gain A come approximate, then due to the propagation delay t in hearing aid It is formed by voice signal y (t) by providing as follows,

(i) y (t)=Dx (t)+Ax (t- Δ t),

Or

(ii) Y (z)=(D+Az^-Δn)·X(z)

In a frequency domain, wherein Δ n corresponds to propagation delay t.It is provided if be added to masking signal now by gain A Preliminary output signal, then the masking signal can generate addition Item in transmission function, on right side by bracket in equation (ii) In item provide.Advantageously, masking signal has twice of 2 Δ t of propagation delay relative to direct voice Dx (t), this leads Cause the item Cz in the transmission function of equation (ii)^-2Δn,

(iii) Y (z)=(D+Az^-Δn-C·z^-2Δn) X (z)=H (z) X (z)

Here, passing through the corresponding frequency dependence of item C, i.e., equation is considered by D=D (z)=> C=C (z) (iii) frequency dependence of D in.Now it can be shown that by corresponding in the transfer function H (z) according to equation (iii) , it is provided using following characteristics about the inhibition optimal masking signal of comb filter effect:

(iv) C=De^2(∠A-∠D)=| D | e^2∠A-∠D,

Wherein ∠ A or ∠ D is referred to as the complex phase of A or D.After being reproduced by output translator, in signal value Y_C(z) =-Cz^-2ΔnThe advantageous value of the masking signal formed in X (z), herein can also be for transfer function H (z) for covering Cover the important value of the amplitude of signal | C | with ideal value | D | little deviation, and for C the phase little deviation obtain.It is special Not, relative to ideal value | D | value | C | relative deviation can be up to 6dB, and the absolute deviation of phase ∠ C can be high Up to ± 30 °, i.e. the p/6 of 2 ∠ A- ∠ D of desired phase.

In other advantageous implementation, other input signal is generated by the other input converter of hearing aid, wherein Preliminary output signal is generated as phasing signal according to other input signal by signal processing, and is wherein believed according to input Number and/or other input signal and/or phasing signal generate masking signal.This makes even if in the direct sound for depending on direction Also it can compensate for comb filter effect in sound.Particularly, here, each orientation valve of the directional characteristic of phasing signal is explained For individual signal source, signal source is superimposed with expected direct voice leads to individual comb filter effect, thus preferably Individual masking signal is generated for each of these signal sources.

The invention further relates to a kind of hearing aid, have at least one input converter for generating input signal, with Input converter connection is used to generate the signal processing unit of preliminary output signal according to input signal and for reproducing output At least one output translator of signal, wherein signal processing unit is designed to be used as according to input signal and preliminary output Signal generates output signal by according to the method for the present invention.Here, the advantages of mentioning for the method and its extension can To contrast it is converted to the hearing aid.

Detailed description of the invention

Below with reference to the accompanying drawings the embodiment of the present invention is explained in greater detail.In attached drawing:

Fig. 1 diagrammatically illustrates the hearing aid in ear canal with profilograph, is also propagated direct voice by the hearing aid To hearing organ,

Fig. 2 is diagrammatically illustrated for the output voice signal of direct voice, hearing aid with chart and is formed sound by superposition The frequency response of sound signal,

Fig. 3 diagrammatically illustrates the method for inhibiting the comb filter effect in the hearing aid according to Fig. 1 with block diagram,

The output that Fig. 4 a is superimposed in the case where being schematically illustrated in no masking signal with zero pole plot by direct voice The transmission function of voice signal,

Fig. 4 b diagrammatically illustrates the frequency response of the transmission function for being formed by voice signal according to Fig. 4 a,

Fig. 5 a be schematically illustrated in zero pole plot with masking signal in the case where according to the transmission function of Fig. 4 a,

Fig. 5 b diagrammatically illustrates the frequency response of the transmission function for being formed by voice signal according to Fig. 5 a,

Fig. 6 shows the replacement implementation by the method according to Fig. 3 of shotgun microphone with block diagram.

Each corresponding component and parameter are respectively provided with identical appended drawing reference in all the drawings.

Specific embodiment

The profilograph of hearing aid 1 is diagrammatically illustrated in Fig. 1, which is arranged in the user's not being shown specifically In ear canal 2.The hearing aid 1 is designed to ITE instrument (" in-the-ear ") herein.What it is far from hearing aid 1 is outside sound source 4, Voice signal 6 is emitted to the ear 8 of the user of hearing aid 1 from the outside sound source 4.Here, side of the voice signal 6 to be further described Formula is converted to input signal by the input converter 10 of hearing aid, which is further processed in hearing aid 1, and Especially enhanced herein depending on frequency, wherein the processing result of the output translator 12 as hearing aid 1, in ear canal 2 It is middle to generate the output voice signal 14 for depending on voice signal 6.The output voice signal 14 travels to hearing organ by ear canal 2 16, hearing organ 16 especially includes eardrum 18.By narrow gap 20 between hearing aid 1 and ear canal 2 or by It is being arranged in hearing aid 1, venthole 22 for avoiding blocking effect is set there, a part of voice signal 6 is made now Hearing organ 16 is also traveled to for direct voice 24.Here, this causes to export voice signal 14 and direct voice 24 in ear canal 2 Superposition.Because exporting voice signal 14 relative to direct voice 24 due to the filter for being used for signal processing in hearing aid 1 With certain propagation delay, so in the amplitude proportional according to output voice signal 14 and direct voice and according to frequency Occurs so-called comb filter effect in superposition.The comb filter effect is shown in FIG. 2.

In Fig. 2, sound level P is drawn by being respectively relative to frequency f, it is (empty to diagrammatically illustrate direct voice 24 with chart Line) frequency response, by the frequency response of output voice signal 14 (dotted line) that is enhanced according to the hearing aid of Fig. 1 and by superposition shape At voice signal 26 (solid line) frequency response.Due to already mentioned propagation delay in the signal processing in hearing aid, Direct voice 24 is superimposed with output voice signal 14 with time delay.

Now, it can see in being formed by voice signal 26, in specific frequency, the superposition of time delay causes Constructive interference 28, this leads to the raising of sound level on the whole in the voice signal 26 of superposition.On the other hand, in some frequencies In, the superposition of time delay leads to destructive interference 30, and destructive interference even results in almost complete in the voice signal 26 of superposition sometimes Full elimination.Here, the maximum value of constructive interference 28 is located at the frequency corresponding to the time delay inverse in hearing aid At integral multiple, the minimum value of destructive interference 30 is respectively at the half integer multiple of the frequency.According to the voice signal 6 according to Fig. 1 Enhancing specific to user and time for occurring with the frequency spectrum of direct voice 24, for generating output voice signal 14 are prolonged Late, the comb filter effect occurred may be perceived as very uncomfortable by the user of hearing aid.

It is schematically shown with block diagram for inhibiting the comb filter according to fig. 2 in the hearing aid according to Fig. 1 in Fig. 3 The method of effect.The input converter 10 provided herein by microphone generates input signal 32 according to voice signal 6 first.It is existing Preliminary output signal 36 is being generated by signal processing 34 according to the input signal 32, which especially includes using In the dysacousis for compensating user by the enhancing for depending on frequency band according to audiograph, algorithm specific to user.Equally Ground, now according to the input signal 32, by determine before and store, provide about by the straight of the ear canal 2 at hearing aid 1 Connect the parameter 38 of the message of voice path and the message about its frequency response, determine at hearing organ 16 expected from directly Sound 24 ', the expected direct voice 24 ' correspond exactly to auditory organ that is ideal, traveling to user in the ideal case The direct voice 24 of official 16.

Here, for example passing through input according to voice signal 6 by the first transmission function 40 that is corresponding, considering parameter 38 Signal 32 determines the amplitude spectrum of expected direct voice 24 '.

Masking signal 44 is generated for following frequency range according to expected direct voice 24 ' now, for the frequency The sound level of range, the voice signal generated according to preliminary output signal 36 by output translator 12 will be in low -6dB and high 12dB Between.Here, masking signal 44 is, the range value of masking signal 44 is in the case where considering the reproducing characteristic of output translator 12 Correspond mainly to the range value of expected direct voice 6 ', however relative to expected direct voice (and mainly with respect to defeated Enter signal 32) 2 Δ of time interval is delayed, wherein Δ indicates that the propagation delay in hearing aid 1, the propagation delay are based primarily upon The filter used in signal processing 34.

Here, the specific generation of masking signal 44 can also again through the second transmission function 42 and input signal 32 into Row, wherein the dependence with expected direct voice 24 ' is generated indirectly by input signal 32.However, in this case, Variation in expected direct voice 24 ' also leads to the variation in masking signal 44, because in expected direct voice 24 ' Variation need the variation of voice signal 6, and therefore need the variation of input signal 32.

Now, masking signal 44 is superimposed with preliminary output signal 36, and thus generates output signal 50.Output letter Numbers 50 are converted to output voice signal 14 ' by the output translator 12 provided herein by loudspeaker.Here, the output sound is believed Numbers 14 ' are different from the output voice signal by considering expected direct voice 24 ' by masking signal 44 according to fig. 2 14。

In the illustration of FIG. 1, output voice signal 14 ' passes through the ear canal 2 being superimposed there with true direct voice 24 Travel to the eardrum 18 of user.Here, being superimposed shape with direct voice 24 by output voice signal 14 ' by masking signal 44 At voice signal in avoid comb filter effect.The working method of this inhibition is explained in detail referring to Fig. 4 and Fig. 5.

Fig. 4 a shows the output sound being superimposed in the case where not using masking signal 44 according to Fig. 3 by direct voice The zero pole plot of the transfer function H (z) of signal.Here, be formed by signal 0. 54 extend along unit round wires 56.Working as In preceding situation, export voice signal and direct voice for the frequency spectrum that is checked from 0 to 500Hz amplitude having the same.Scheming In 4b, is shown as unit of dB relative to frequency f be formed by voice signal 26 about the sound according to the input of Fig. 1 herein The frequency response of the transmission function of signal 6.Can be clearly seen decaying 58 herein, decaying 58 correspond respectively to positive imaginary part half-plane and 0. 54 in negative imaginary part half-plane.Therefore correspond to 0. 54 elimination 58 of transmission function herein by cancellation according to fig. 2 Interference 30 causes.

Fig. 5 a now illustrates the zero pole plot of the case where according to Fig. 4 a, wherein using root to generate output voice signal According to the method for Fig. 3, i.e., masking signal 44 is especially mixed into preliminary output signal 36.It will be clear that 0. 54 is present No longer extend along unit round wires 56, but with alternate small radii r1 or relatively large radius r2 and the slightly interval of unit round wires 56 It opens.The frequency response of transmission function shown in figure 5b no longer has any elimination 58, but only with the small line of about 6dB Wave.Here, the amplitude of masking signal corresponds to the amplitude of direct voice, and compared to direct voice, masking signal is delayed It is present in twice of value of the propagation delay between direct voice and preliminary output signal.

Fig. 6 is shown with block diagram to be implemented according to the replacement of the method for Fig. 3.Here, hearing aid 1, which has, generates other input The other input converter 60 of signal 62.According to input signal 32 and other input signal 62 the first of signal processing 34 Phasing signal 66 is generated in box 64.Here, masking signal 44 can be by according to input signal 32 and according to other defeated Enter signal 62 and/or estimates that expected direct voice 24 ' generates according to phasing signal 66.Here, according to current input signal 32,62 phasing signal 66 is also considered when necessary to generate other phasing signal 68.The other phasing signal 68 can with it is fixed It is identical to signal 66, or if phasing signal 66 is not accurately aligned with the source of direct voice for example, if necessary may be used With variant.Similarly masking signal 44 is generated with the method that describes according to Fig. 3 now according to other phasing signal 68.

Although the present invention is illustrated and is described by preferred embodiment in detail, the present invention is not limited to institutes Disclosed embodiment.Those skilled in the art can therefrom export other schemes, without departing from protection scope of the present invention.

Reference signs list

1 hearing aid

2 ear canals

4 outside sound sources

6 voice signals

8 ears

10 input converters

12 output translators

14 output voice signals

14 ' output voice signals

16 hearing organs

18 eardrums

20 gaps

22 ventholes

24 direct voices

24 ' expected direct voices

26 voice signals formed

28 constructive interferences

30 destructive interferences

32 input signals

34 signal processings

36 preliminary output signals

38 parameters

40 first transmission functions

42 second transmission functions

44 masking signals

50 output signals

54 zero points

56 unit round wires

58 eliminate

60 other input converters

62 other input signals

First box of 64 signal processings

66 phasing signals

F frequency

H (z) transmission function

r₁Radius

r₂Radius

Δ propagation delay