DE10053179A1 - Fitting device for hearing aid stores sound source for test subject's evaluation of each solution vector - Google Patents

Abstract

The device includes an initial solution setting device (2a) for defining an initial set of solution vectors to be updated. A parameter writing device (2b) converts the solution vector into adjustment parameter values for the hearing aid and stores them in a hearing aid parameter memory (4). An evaluation value acquisition device (2c) obtains a test subject's evaluation value for each solution vector. An optimal solution estimation device (2d) estimates an optimal solution based on the value of each solution vector and the evaluation value for each solution vector. A sound source memory (1a) stores the sound source for the test subject's evaluation of each solution vector. A sound source presentation device (1d) presents the sound source to the hearing aid, the sound source being ambient noise.

Description

The present invention relates to a hearing aid fitting device that a interactive evolutionary calculation or development calculation (IEC) by ei a genetic algorithm or development algorithm (GA) and the like ver turns.

A normal hearing aid has several types of adjustment functions. This setting radio For example, it contains a subordinate volume, an output level limit, a tone control (frequency characteristics setting functions, the mainly use a filter), an automatic gain control (AGC), etc. The extent of adjustment of each adjustment function is of a loading user or adjuster (an audiologist, a doctor, a sales person and the like) freely changeable.

Hearing aid adjustments mean an operation to adjust the extent a setting (a setting value) for each setting function to a value for any person with hearing impairments is suitable. In most cases len is an audiogram for the person with hearing impairment measure, and the result obtained is then entered into a prescribed formula set to get the set value.

However, an is different from such a normal method fitting procedure of an interactive development calculation (IEC) proposed, which often uses a genetic algorithm (GA), which is used for blemen is used for an optimal solution and the like.  

In this method, a multidimensional vector, for which an essential ch element is the extent of adjustment of each adjustment function, as a solution vector set (as a chromosome). A sound source, such as one in Ant word processed on each solution vector, the voice signal is related to a Hearing impaired person presents. The genetic algorithm (GA) is based on an estimate of the hearing impaired person processed according to each solution vector to an optimal solution vector to estimate.

According to this method, an adjustment result by which the in with regard to hearing impaired person with regard to hearing best (on most comfortable) feels, not by individually calculating an optimal setting value for each setting function, but by taking into account the interaction between each setting function can be obtained.

As a device of this type, Japanese Unexamined Patent Publication chung No. Hei 9-54765 discloses an optimizing adjustment device. This opti The adjusting device uses the charak in the IEC adaptation process teristic values of a past estimate of a subject and the physio logical data of the subject and arranges the solution vector in an order from new estimated points in the middle of the estimate to efficiently after to find the optimal solution vector.

When fitting hearing aids using the IEC fitting method run have the characteristic properties of those used Sound source has a big impact on the result. In the past there is often one Speech signal has been used as the sound source, but the optimal solution In this case, tor becomes "the characteristic properties in which the Subject can hear the speech signal most comfortably ".

However, wearers of the hearing aids use the hearing aids in different ways (they are exposed to ambient noise). Accordingly, these are characteristic properties not always those that are most suitable for the carriers are in all environments, which is why there is a problem in them states that it is difficult for them to change the speech signal depending on the type and heard from the level of ambient noise.  

Furthermore, an adjustment operation takes place because of such an adjustment process "an interactive operation" is some time, which is a problem. The time näm in which the hearing impaired person responds to the response sound source processed to the solution vector, its estimate relative determined to be the solution vector is different for each subject. Since the pro gram does not proceed to the next step until the estimated value is relative to the solution is entered, there is a problem that is that for the Adjustment operation required time cannot be predicted.

It is therefore an object of the present invention to provide an improved hearing aid Adaptation device to create all of the above problems State of the art solves.

According to one aspect of the present invention, a hearing aid Adaptation device created, comprising: an initial solution Setting device for determining an initial group of a solder to be renewed solution vector, a parameter writer for converting the solution vector tors in setting parameter values of a hearing aid and for writing the parameters values in a hearing aid parameter storage element of the hearing aid, an evaluation value receiving device for obtaining an evaluation value of a subject rela tiv for each solution vector, an optimal solution estimator for estimating zen an optimal solution based on a value of each solution vector and the evaluation value relative to each solution vector, a sound source Storage means for storing a sound source for the subject to each Lö to evaluate solution vector, and a sound source presentation device for pre send the sound source to the hearing aid, the sound source being an ambient sound is.

With this structure it is because the sound source to be presented is the reverse practice sound is possible to perform a hearing aid fitting operation that ge true to the subjective evaluation of a person with hearing impairment is in a state that is close to its real user environment.  

Furthermore, the sound source consists of a variety of ambient sounds in order estimate the optimal solution vector relative to each surrounding sound Zen.

With this structure, it is because the sound source to be presented is a lot number of ambient sounds is possible, not just an adaptation operation perform that is specific to a specific sound environment, but also one Perform adjustment operation that is appropriate for different sound environments is not.

Likewise, the one presented by the sound source presentation facility Sound source turned to an external electrical input connector of the hearing aid give.

With this structure, it is not necessary to provide a soundproof room. A Hearing aid fitting device can be easily placed on the hearing aid adaptation can be installed.

It is also possible to make a hearing aid fitting operation more suitable for the real one Perform environment by giving the hearing aid wearer a lot of ambient sound Presence is presented.

The sound source storage device is also connected through a communication line connected to the sound source presentation device.

With this structure, it is possible to use the sound source storage device at one Integral control of hearing aid fitting service center and the like and compli cations related to the management and operation of the sound source Reduce storage facility.

According to a further aspect of the present invention, a hearing aid Adaptation device created, which comprises: an initial solution - Setting device for determining an initial group of a solder to be renewed solution vector, a parameter writer for converting the solution vector tors in setting parameter values of a hearing aid and for writing the parameters values in a hearing aid parameter storage element of the hearing aid, an evaluation  value receiving device for obtaining an evaluation value of a subject rela tiv for each solution vector, an optimal solution estimator for estimating zen an optimal solution based on a value of each solution vector and of the evaluation value relative to each solution vector, a sound source Presentation device for presenting a sound source for a subject Hearing aid to evaluate each solution vector and a timer device for the sound source presentation device for presenting the sound source in one Order in fixed time intervals.

With this structure, it is possible to have a hearing aid fitting operation that is faithful the subjective assessment of a person with hearing impairment, to be carried out reliably within a fixed time.

According to a further aspect of the present invention, a hearing aid Adaptation device created, comprising: an initial solution Setting device for determining an initial group of a solder to be renewed solution vector, a parameter writer for converting the solution vector tors in setting parameter values of a hearing aid and for writing the parameters values in a hearing aid parameter storage element of the hearing aid, an evaluation value receiving device for obtaining an evaluation value of a subject rela tiv for each solution vector, an optimal solution estimator for estimating zen an optimal solution based on a value of each solution vector and of the evaluation value relative to each solution vector, a sound source Presentation device for presenting a sound source for a subject Hearing aid to evaluate each solution vector and a sound source Controller for controlling the timing of this sound source presentation set up the sound source to the hearing aid in an order according to the time admitted for the evaluation value receiving device to receive the evaluation value have to present.

With this structure it is possible to have a hearing aid Adjustment operation, which is true to the subjective evaluation of one in relation to one Hearing impaired person is, according to the subject's intention and without that To give the subject an uncomfortable feeling to perform reliably.  

If there is any solution vector on which the evaluation value is not ge has responded after presenting the sound source with respect to the the last solution vector of generation is finished, the presentation of the sound source with respect to the solution vector to which the evaluation value did not respond has executed again.

With this structure, it is possible to make an evaluation value relative to the solution vector gate to which the valuation value did not respond. It is also possible to have a hearing aid fitting operation that is true to the subject ven assessment of a hearing impaired person, according to the Intention of the subject without giving the subject an uncomfortable feeling and to execute within a fixed time.

The above and other objects, features and advantages of the present invention will be apparent from the following description in conjunction with the accompanying Drawings become clearer.

Fig. 1 is a schematic diagram of a hearing aid fitting device according to a first embodiment of the present invention;

Fig. 2 is a flow chart of a hearing aid adapter when ambient sound is used;

Fig. 3 is a flow diagram of a hearing aid fitting apparatus, when three ambient sounds are used;

Fig. 4 is a schematic diagram of memory elements of a hearing aid with three parameters;

Fig. 5 is a schematic diagram of a hearing aid fitting device intended for a hearing aid with an external electrical input connector;

Fig. 6 is a schematic diagram of a hearing aid to passungsvorrichtung according to a second embodiment of the present invention;

Fig. 7 is a flow diagram of the hearing aid fitting apparatus according to the second embodiment of the present invention;

Fig. 8 is a schematic diagram of a hearing aid fitting device according to a third embodiment of the present invention;

Fig. 9 is a flow diagram of the hearing aid fitting apparatus according to the third embodiment of the present invention; and

Fig. 10 is a flow diagram of the hearing aid fitting apparatus according to the third embodiment of the present invention.

Preferred embodiments of the present will now become hereinafter Invention described with reference to the accompanying drawings.

A hearing aid adaptation device according to a first exemplary embodiment of the present invention has, as shown in FIG. 1, a sound source processing element 1 and a parameter generating element 2 . The reference symbol 3 is a so-called programmable hearing aid, and the reference symbol 5 is a loudspeaker for presenting a speech signal, an ambient sound and the like, which have been processed for a hearing aid, for the programmable hearing aid 3 .

The sound source processing element 1 consists of a sound source storage element 1 a, a sound source signal conversion element 1 b, a sound source signal selection element 1 c and a sound source presentation element 1 d. The parameter generating element 2 consists of an initial solution setting element 2 a, a parameter writing element 2 b, an evaluation value receiving element 2 c and an optimal solution estimation element 2 d.

The programmable hearing aid 3 consists of a microphone 3 a, an amplifier 3 b, a hearing aid processing element 3 c, an earphone 3 d and a parameter storage element 4 , the parameter writing element 2 b with the parameter storage element 4 des programmable hearing aid 3 is connected.

The sound source storage element 1 a stores a variety of ambient sound files in which the ambient sounds are digitally recorded, which a wearer of the programmable hearing aid can meet if possible, and a calibration sound file. The ambient sound files and the calibration sound files are composed of, for example, digital data such as a WAVE file format.

The sound source signal conversion element 1 b has a function for accessing the surrounding sound file, which is stored in the sound source storage element 1 a, based on a control signal from the sound source signal selection element 1 c. The sound source signal converting element 1 b also has a function for converting digital data stored in the ambient sound file into an analog ambient sound signal.

The sound source presentation element 1 d amplifies or attenuates a sound source signal (an analog ambient sound signal) output from the sound source signal converting element 1 b to a predetermined level. The sound source presentation element 1 d then presents the amplified or damped sound source signal to the programmable hearing aid 3 using the loudspeaker 5 and the like.

The initial solution setting element 2 a sets a group of initial solution vectors, the solution vector being composed of setting values for each setting function of the programmable hearing device 3 that is selected as the target.

The parameter writing element 2 b has a function for writing the solution vector, which is set in the initial solution setting element 2 a, or the solution vector, which is estimated in the optimal solution estimation element 2 d, in a parameter storage element 4 of the programmable hearing aid 3 as parameters of the setting function of the programmable hearing aid 3 .

The evaluation value receiving element 2 c receives an evaluation value of a subject relative to the processed sound source when the subject hears the sound source processed in the hearing aid processing element 3 c of the programmable hearing aid 3 .

The optimal solution estimating element 2 d processes a genetic algorithm (GA) using the evaluation value of the subject relative to each solution vector obtained in the evaluation value receiving element 2 c, and it generates a new solution vector group.

An operation of the hearing aid fitting device according to the first embodiment of the present invention will now be described hereinafter with reference to a flowchart as shown in FIG. 2.

First, in a step SP 1, the audiogram of a person with impaired hearing is measured. In a step 2 , using the measured audiogram and a known hearing aid adaptation formula, a limit range for limiting a search range of setting values of a volume control and an output limit is calculated so that no sound that is too loud or sound is output during the adaptation operation.

Next, in a step SP 3 before the adjustment operation, the sound source signal selection element 1 c for accessing the calibration sound file is operated by the sound source storage element 1 a for calibrating a sound pressure level when the sound source is presented. The calibration sound file is then presented by the sound source presentation element 1 d.

In a step SP 4 , the presented sound pressure level is calibrated using a sound level meter and the like by controlling an amount of gain or attenuation of the sound source presentation element 1 d.

The ambient sound file is accessed in a step SP 5 . The information about "the environment (for example, a home, an office, a company, and the like) where the hearing aid is used most often" is to be collected by the subject in advance, and the ambient sound file used for such an environment is used here next one is.

Next, in a step SP 6, a group of an initial value of the solution vector is composed of the set value of each setting function of the programmable hearing aid 3 , which is called the initial solution vector group P _k (k = 1, 2, 3,..., N) , provided to run the genetic algorithm (GA). Here n = 20 is set. The initial solution vector group P _k (k = 1, 2, 3,..., N) is randomly determined using a random number and the like in a normal genetic algorithm (GA), but in step SP 2 a limit for the search range of the Adjustment value of the volume control and the output limit provided in order not to produce a sound that is too loud or too soft during an adjustment operation.

In a step SP 7 , any solution vector P _{k is determined} from the set 20 pieces of solution vectors P _k . This determination is usually made by the subject himself.

In a step SP 8 , the solution vector P _k determined in step SP 7 is converted into a parameter of the programmable hearing device 3 in the parameter writing element 2 b, and in a step SP 9 this parameter is written into the parameter storage element 4 of the programmable hearing device 3 .

In a step SP 10 , the ambient sound file accessed above is reproduced at the sound source signal conversion element 1 b and at the sound source presentation element 1 d, and the reproduced ambient sound file is then presented to the programmable hearing aid 3 by the loudspeaker 5 . The subject listens to the output sound (ie the ambient sound that has been processed in response to the solution vector P _k for a hearing aid) of the programmable hearing aid 3 .

In a step SP 11 , the evaluation value receiving element 2 c receives a evaluation value E _{k of} the subject relative to the presented sound, namely the solution vector P _k at this time. The evaluation value E _k is a numerical value with five levels from 1 to 5, which express the subjective evaluation by the subject based on intelligibility and comfort or comfort relative to the presented sound, with the value 1 expressing the lowest evaluation or the value 5 expresses the highest rating. In a step SP 12 , if the subject orders the renewal of the solution vector group, the program goes to a step SP 13 , and if not, the steps SP 7 to SP 11 are repeated.

In step SP 13 , it is judged whether or not all of the evaluation values from E ₁ to E ₂₀ have been received, and if they have not been obtained, the program goes to step SP 7 , and the above operation is repeated. On the other hand, when all the evaluation values from E ₁ to E ₂₀ have been obtained, the program goes to a step SP 14 , in which it is judged whether the predetermined end condition is satisfied or not.

In step SP 14 , when it is judged that the predetermined end condition is satisfied, the adjustment operation is ended. Thus, the solution vector P _{k obtained} as the highest evaluation value among the current solution vector group P _k (k = 1, 2, 3,..., N) is regarded as the final adjustment value.

On the other hand, if it is judged that the end condition is not satisfied, a selection, a chiasm and a change in the genetic algorithm (GA) are made in a step SP 15 using the current solution vector group P _k (k = 1, 2, 3 ,..., n) and the evaluation value E _k relative to each solution vector P _{k in} order to generate a new solution vector group P ' _k .

The above operation (SP 7 to SP 14 ) is repeated for the new solution vector group P ' _k . The predetermined end condition is a condition for stopping the development or evolution of the genetic algorithm. For example, by determining the number of times of development in advance, the adjustment operation can be automatically ended when the number of times reaches the predetermined level.

Although not shown in Fig. 2, obtaining the evaluation value _{Ek is} not necessarily carried out after the sound source is presented. In most cases it is possible to rewrite or overwrite the previous evaluation value E _k at any time before the new solution vector P ' _{k is} generated.

Furthermore, in steps SP 1 and SP 2, a device for a range limit with regard to the setting values of a volume control and an output limit is provided to avoid the presentation of a sound that is too loud or a sound that is too quiet. The number of controls in which the range limit is provided is not limited to 2, but the range limit may be provided in other controls, such as AGC control and tone control, according to the purpose.

A range limit of a search space of the solution vector P _k is determined using the audiogram and a known adaptation formula. However, by preparing a predetermined signal for examination (such as a pure tone and a band noise) in the sound source storage element 1 a in advance, it is possible to have a hearing threshold level (HTL) and / or an uncomfortable volume level (UCL), the most uncomfortable volume level (MCL) and the like, thereby providing a limitation on the value of the controller in response to these values found.

The number of developments of the genetic algorithm (GA) is described above as the final condition. In addition, the fitting operation may be terminated when the solution vector P _k of E _k = 5 exceeds the predetermined number or when an average value of E _k exceeds the predetermined value.

Likewise, the adaptation operation can be ended by estimating a convergence condition for the genetic algorithm (GA) from a Euclidean distance between each solution vector P _k and the like if the convergence condition exceeds a fixed level.

The solution vector P _k that has received the highest evaluation value among the current solution vector group P _k (k = 1, 2, 3,..., N) is set as the final adjustment value, but is assumed to be a Large number of solution vectors P _k with most digits (5 digits) can give. In such a case, it is possible to select one of these as the final adjustment value, or to let the subject select his preferred solution vector P _k by listening again to only the solution vector P _k with the most digits.

A method of finding the adjustment value using an ambient sound is described above, but in this case there is some possibility that the adjustment value is specific to the ambient sound used. To avoid such a phenomenon, it is necessary to perform the operation of the flowchart as shown in FIG. 2 with respect to a variety of surrounding sounds in order to find the adjustment value relative to each surrounding sound separately.

The sound source used here can be determined based on the environment the one the subject is most likely to be in, or instead a predetermined sound source can be used.

The final adjustment value can be determined by asking the subject to listen to all of the ambient sounds used under a condition under which the programmable hearing aid 3 is set to the adjustment value obtained relative to each ambient sound, and then by his selects the preferred adjustment value.

Hereinafter, an operation of the hearing aid fitting device according to the first embodiment of the present invention using three ambient sounds is described in connection with a flowchart as shown in FIG. 3. However, the content that is the same as with respect to the flowchart shown in FIG. 2 is not described hereinafter.

First, steps SP 21 through SP 24 are the same as those for the flowchart shown in FIG. 2 using an environmental sound.

Next, at a step SP 25 for accessing a first ambient sound file S ₁ within the environment sound file Si i = 1, and in a step SP 26 is accessed on the first ambient sound file _S1.

In a step SP 27 , a group of initial values for the solution vector, which is composed of the setting values for each setting function of the programmable hearing device 3 , ie an initial solution vector group P _k (k = 1, 2, 3,..., N), is set to run the genetic algorithm (GA).

A step SP 28 is the same as the steps SP 7 to SP 16 of the flowchart as shown in FIG. 2.

Next, in a step SP 29, an end adjustment value S _{1 of} the solution vector P _k , which has received the highest evaluation value under the current solution vector group P _k (k = 1, 2, 3,..., N), is determined . Thus, by repeating the operations of steps SP 26 to SP 29, the adjustment values F ₁ , F ₂ and F _{3 are} each determined relative to three ambient sound files S ₁ , S ₂ and S ₃ .

In steps SP 33 to SP 41 , the programmable hearing aid 3 is set to the adaptation values F ₁ , F ₂ and F ₃ , which are obtained relative to a respective one of the surrounding sound files S ₁ , S ₂ and S ₃ . Under such a condition, a subject is asked to listen to the surrounding sounds from all the surrounding sound files S ₁ , S ₂ and S _{3 used} . The subject then determines the final fitting value F among the fitting values F ₁ , F ₂ and F ₃ to end the hearing aid fitting operation.

As shown in Fig. 4, the programmable hearing aid 3 has three parameter storage elements, which consist of a first parameter storage element 4 a, a second parameter storage element 4 b and a third parameter storage element 4 c, as storage for storage the parameter. A user can select any of these memories by a selection switch 6 . Thus obtained three adjustment values F ₁ , F ₂ and F ₃ can be stored in a respective parameter storage element 4 a, 4 b and 4 c, and the user can also use any one of them according to the application environment. It should be noted that the number of memories for storing the parameters is not limited to three, but can be more than three.

The above describes a case in which the ambient sound, which becomes the sound source for IEC adaptation, is presented by the speaker 5 , but in such a presentation device of the ambient sound, a silenced chamber and the like are necessary. Accordingly, there is a problem that this device is not suitable for a place such as where the hearing aid fitting operation is performed because there is normally not enough space in such a place.

Also in the practical operation of such a device, a sound pressure level measuring device such as a sound level meter is necessary when performing a sound field calibration, which is why there is a problem that special knowledge is also required for the calibration operation. To solve such a problem, a device using an external electrical input terminal 8 e of the programmable hearing aid 8 as shown in FIG. 5 is more useful.

When a connector (not shown), which is connected to the output end of a calibration unit 7 , is inserted, the external electrical input terminal 8 e is designed such that a connection state between the output side of a microphone 8 a and the input side of an amplifier 8 b is released to connect the output end of the calibration unit 7 to the input side of the amplifier 8 b.

The calibration unit 7 has a function of outputting a Umgebungsklangsi gnals to the external electrical input terminal 8 e of the programmable hearing device 8 and for displaying an equivalent sound pressure level of this Conversely bung sound signal. The equivalent sound pressure level means the level at which chem a voltage of the ambient sound signal has been converted into a sound pressure level, which acts on the microphone 8 a.

In the above-mentioned embodiment of the present invention, it was explained that the sound source storage element 1 a is arranged in the same area as the sound source signal conversion element 1 b and the sound source signal selection element 1 c.

However, it should be noted in the hearing aid adaptation device according to the present inven tion that the sound source storage element 1 a away from the sound source signal conversion element 1 b, from the sound source signal selection element 1 c and the like can be arranged away.

In this case, the sound source storage element 1 is constructed from a built-in hard disk of a personal computer, while the sound source signal converting element 1 b, the sound source signal selection element 1 c and the like are constructed from another personal computer. Another personal computer can mean more than one.

By connecting this personal computer through a communication line, the sound source storage element 1 a can be arranged at a hearing aid adaptation service center, while the sound source signal conversion element 1 b, the sound source signal selection element 1 c and the like can be arranged at a respective hearing aid adaptation location.

This makes it possible to not only share the surrounding sound files, but also to control and operate them in a simple way.

A hearing aid adaptation device according to a second exemplary embodiment of the present invention has, as shown in FIG. 6, a timer 11 , a sound source presentation element 12 and a parameter generation element 2 .

The timer 11 outputs a control signal to a parameter writing element 2 b of the parameter generating element 2 in order to command the parameter writing element 2 b to write the parameter into a parameter storage element 4 of the programmable hearing device 3 at predetermined time intervals. The timer 11 also outputs a control signal to the sound source presentation element 12 to determine the timing of the start of a presentation of the sound source.

The sound source presentation element 12 receives a control signal from the timer 11 and presents a sound source from a loudspeaker 5 to the programmable hearing aid 3 . The sound source contains a speech signal such as a word and a short sentence and ambient noise in response to an application environment of the hearing aid.

Since the parameter generating element 2 , the programmable hearing aid 3 and the loudspeaker 5 have the same structure as those of the first embodiment, the description is omitted hereinafter.

An operation of a hearing aid fitting device according to the second embodiment of the present invention will now be described hereinafter with reference to a flowchart as shown in FIG. 7.

First, in a step SP 51, an audiogram of the person with impaired hearing is measured. In a step SP 52 , a limit range for limiting a search range of a setting value of a volume control and an output limit is calculated using the measured audiogram and by a known hearing aid adaptation formula so as not to output a sound that is too loud or too quiet during the adaptation operation.

Next, in a step SP 53, a group from an initial value of a solution vector, which is composed of a set value for each setting function of the programmable hearing aid 3 , namely a so-called initial solution vector group P _k (k = 1, 2, 3,... , n), set to process a genetic algorithm (GA). Here n = 20 is set.

The initial solution vector group P _k (k = 1, 2, 3,..., N) is randomly determined using a random number and the like in the normal genetic algorithm (GA). However, in the above step SP 52, a limitation of a search range of the volume control setting value and the output limit is provided so as not to output a sound that is too loud or too quiet during the adjustment operation.

After an initial setting (k = 1) is effected in a step SP 54 , in a step SP 55 a solution vector P _{1 is} converted into a parameter of the programmable hearing device 3 by a parameter writing element 2 b. In a step SP 56 , the parameter is now written into a parameter storage element 4 of the programmable hearing aid 3 .

Next, in a step SP 57, a sound source is reproduced by a sound source presentation element 12 and presented from a loudspeaker to the programmable hearing aid 3 . A subject listens to an output sound (ie, a sound source that has been processed in response to the solution vector P ₁ for a hearing aid) of the programmable hearing aid 3 . After the sound source is presented to the programmable hearing aid 3 for a fixed time, the presentation of the sound source is ended in a step SP 58 .

In step SP 59 , a timer 11 is started to count a predetermined time (a set time T0) for obtaining an evaluation value. The timer 11 can be started simultaneously with the presentation of the sound source in step SP 57 in order to set the time required from the sound source presentation until a value is obtained to the setting time T0 of the timer 11 .

In a step SP 60 , an evaluation value receiving element 2 c receives an evaluation value E _{1 of} a subject relative to the presented sound at the time at which the timer 11 ends counting the setting time T0.

The evaluation value E ₁ is a numerical value with five levels from 1 to 5 for expressing the subjective evaluation by the subject based on the intelligibility, the comfort and the like relative to the presented sound. A level 1 expresses the lowest rating, while a level 5 expresses the highest rating.

After the setting time T0 has elapsed, the time of the timer 11 is ended and reset. The program goes to step SP 62 where it is judged whether k = 20 or not and goes to step SP 63 where k + 1 is used for k. The program goes back to step SP 55 .

In step SP 55 , a solution vector P _{2 is converted} into a parameter of the programmable hearing aid 3 , and this parameter is written into a parameter storage element 4 in step SP 56 . In step SP 57 , a sound source that has been processed in response to the solution vector P ₂ for a hearing aid is presented by the speaker 5 , and obtaining an evaluation value E2 of the subject relative to the presented sound is performed in step SP 60 . The time for when the parameter is to be written into the parameter storage element 4 is provided by a control signal from the timer 11 at fixed time intervals.

An operation of steps SP 55 to SP 63 will be repeated hereinafter in the same manner as mentioned above. Thus, with respect to the solution vector P ₃ , P ₄ ,. , ., P ₂₀ a presentation of the sound source, which in response to the solution vector P ₃ , P ₄ ,. , ., P _{20 has} been processed for a hearing aid, and obtaining the evaluation value E ₃ , E _4,. , ., E _{20 of} the subject executed relative to the presented sound.

When all the evaluation values E ₁ to E ₂₀ are obtained, it is judged in a step SP 64 whether or not the predetermined end condition is met. When the predetermined end condition has been met, the adjustment operation is ended. The solution vector P _k that received the highest evaluation value among the current solution vector group P _k (k = 1, 2, 3,..., N) is regarded as the final adjustment value.

On the other hand, when it is judged that the end condition is not satisfied, in a step SP 65, a selection, a chiasm and a change in a genetic algorithm (GA) using the evaluation value E _k relative to the current solution vector group P _k (k = 1, 2, 3,..., N) and each solution vector P _k for generating a new solution vector group P ' _k .

The above-mentioned operation (steps SP 54 to SP 64 ) is again carried out with respect to the new solution vector group P ' _k (k = 1, 2, 3,..., N). The predetermined end condition has the meaning of the condition for stopping the development of the genetic algorithm (GA). By determining the number of developments in advance, it is possible to automatically end the adjustment operation when the number reaches the predetermined level.

Furthermore, in order to avoid the presentation of a sound that is too loud or a sound that is too quiet in step SP 52, a device for an area limit with respect to the setting value of the volume control and the output limit is provided. However, the controls for providing the range limit are not limited to these two devices, but the same range limit as above can be applied to other controls, such as volume control and tone control by AGC, according to the tasks.

In addition, the boundary area of a search space for the solution vector P _k is determined using the audiogram and a known adaptation formula. However, if a predetermined signal for an examination (a pure tone, a band noise, etc.) is prepared in advance in the sound source storage element, it is also possible to adjust the hearing threshold level (HTL) and / or the uncomfortable volume level (UCL), Find the most comfortable volume level (MCL) and the like of the subject using the signal and provide a limit on the value of the controllers in response to these values.

Although the number of developments of the genetic algorithm (GA) is described as the end condition, it is also possible to end the fitting operation if the solution vector P _k of E _k = 5 exceeds the predetermined number or if an average value of E _k exceeds the predetermined value.

It is also possible to estimate the convergence condition of the genetic algorithm (GA) from a Euclidean distance and the like between each solution vector P _k and to terminate the adaptation operation if the convergence condition exceeds the fixed level.

The solution vector P _k that has received the highest evaluation value under the current solution vector group P _k (k = 1, 2, 3,..., N) is considered the final adjustment value, but it is also considered that there are a large number of solution vectors P _k with the highest number of digits (5 digits). In this case, it is also possible to randomly select any one of them as the final adjustment value or to ask the subject to listen again only to the solution vector P _k with the highest digit and to select his favorite solution vector P _k .

However, in such a hearing aid fitting device according to the second embodiment of the present invention as arranged above, it is considered that the subject does not respond to the evaluation value E _k within the predetermined time (the setting time T0 of the timer 11 ). This means that it is a case in which the setting time T0 has elapsed while the subject is concerned with the selection of the evaluation value and the next sound source is presented.

The genetic algorithm (GA) cannot theoretically develop until all evaluation values E _k relative to all solution vectors Pk have been obtained (it can calculate the new solution vector group P ' _k (k = 1, 2, 3,..., N) ). Accordingly, if there is any solution vector P _k that has not received the evaluation value E _k ; stop the adjustment operation there.

To solve these problems by using the solution vectors P _a , P _b,. , , who who for whom the evaluation value has not been answered, it is after the presentation of the sound source, which has been processed in response to the solution vectors P ₁ to P ₂₀ for a hearing aid, and their evaluation (including no answer) have ended , necessary, the sound source with respect to the unanswered solution vectors P _a , P _b,. , , to present again and the process of obtaining E _a , E _b,. , , to be repeated until the evaluation values E ₁ to E _{20 of} the solution vectors P ₁ to P _{20 have} all been obtained.

Next, the hearing aid fitting device according to a third embodiment of the present invention, as shown in FIG. 8, has a sound source control element 13 , a sound source presentation element 12 and a parameter generating element 2 . The structure used here is exactly like that of the hearing aid fitting device as shown in FIG. 6, except for providing a sound source control element 13 instead of the timer 11 . Accordingly, the structure common to FIG. 6 is not described below.

The sound source control element 13 is mainly provided with a sound source presentation timer for determining a sound source presentation time T1, which is a presentation time of the sound source to the subject, and with an evaluation value reception timer for determining an evaluation value reception time T2, which is the time that is given to the subject for evaluating the presented sound source after the sound source is presented.

The sound source control element 13 outputs a control signal to the sound source presentation element 12 to command the start of the sound source presentation element, and outputs a control signal to the sound source presentation element 12 to the end of the sound source presentation element by the evaluation value reception signal from the evaluation value reception element 2 c to command the parameter generating element 2 . The sound source control 13 outputs a control signal to ei nem parameter write element 2 b of the parameter generating element 2 out to the parameter-writing element to command 2 b, the parameters in a parameter memory element 4 of the programmable hearing aid 3 at fixed time intervals to write.

The sound source presentation element 12 receives a control signal from the sound source control element 13 and presents a sound source from a speaker 5 to the programmable hearing aid 3 . The sound source includes a speech sound, such as a word and a short sentence, and an ambient noise in response to an application environment of a hearing aid.

An operation of the hearing aid fitting device according to the third embodiment of the present invention will now be explained hereinafter with reference to a flowchart as shown in FIGS . 9 and 10.

Steps SP 71 to SP 76 as shown in FIG. 9 have the same structure as steps SP 51 to SP 56 of the flowchart as shown in FIG. 7. Steps SP 88 through SP 92 also have the same structure as steps SP 62 through SP 66 of the flowchart as shown in FIG. 7. Accordingly, the description for these steps is omitted hereinafter.

First, in a step SP 77, a sound source presentation timer is started in which a sound source presentation time T1 has been set in advance. At the same time, in a step SP 78, a sound source presentation element 12 is driven to reproduce a sound source, and then to present the acoustic signal from the speaker 5 to the programmable hearing aid 3 . The subject listens to an output sound (ie a sound source that has been processed in response to a solution vector P _k for a hearing aid) of the programmable hearing aid 3 .

In a step SP 79 , it is judged whether an evaluation value receiving element 2 c has received an evaluation value E _{1 of} the subject relative to the presented sound or not. The evaluation value E ₁ is a numerical value with levels from 1 to 5, which express the subjective evaluation by the subject based on intelligibility, comfort and the like relative to the presented sound, where E ₁ = 1 expresses the lowest evaluation, while E ₁ = 5 expresses the highest rating.

If it is judged that the evaluation value receiving element 2 c has received the evaluation value E ₁ , the sound source presentation by the sound source presentation element 12 is ended in a step SP 80 . At the same time, in a step SP 81 the program goes to a step SP 88 after resetting the sound source presentation timer.

On the other hand, if it is judged that the evaluation value receiving element 2 c has not received the evaluation value E ₁ , it is to be judged in a step SP 82 whether or not the time of the sound source presentation timer has expired, namely whether the sound source presentation time T1 has expired or not after the presentation of the sound source has started.

If it is judged that the sound source presentation time T1 has not passed, the program goes back to step SP 78 , where the sound source is continuously presented. When it is judged that the sound source presentation time T1 has elapsed, the program goes to step SP 83 , and the sound source presentation timer is reset.

Next, in step SP 84, the evaluation value reception timer is started, in which the evaluation value reception time T2, which is the time allotted to the subject for the evaluation value reception element 2 c to receive the evaluation time E ₁ , is set in advance has been. At the same time, it is judged in a step SP 85 whether or not the evaluation value receiving element 2 c has received the evaluation value E _{1 of} the subject relative to the presented sound.

When it is judged that the evaluation value reception element 2 c has received the evaluation value E ₁ , the program goes to a step SP 87 , and the evaluation value reception timer is reset.

On the other hand, if it is judged that the evaluation value reception element 2 c has not received the evaluation value E ₁ , it is to be judged in a step SP 86 whether or not the time of the evaluation value reception timer has expired, namely whether the evaluation value reception time T2 has expired or not after the presentation of the sound source has ended.

When it is judged that the evaluation value reception time T2 has not passed, the program goes back to step SP 85 . On the other hand, when it is judged that the evaluation value reception time T2 has expired, the evaluation value reception timer is reset in step SP 87 .

In the third embodiment of the present invention, when the subject evaluates the presented sound source, the timing may be during the sound source presentation time T1, when the sound source of step SP 79 is presented, or during the evaluation value reception time T2 after the sound source presentation of the step SP 85 has ended. The subject can rate the presented sound source in a timing that is always easier.

It is also because the sound source presentation coincides with a Entry of the evaluation value by the subject is ended and the next Sound source presentation is started, the adjustment operation time possible to reduce. In addition, even if a sound that is unanimous for the subject is, is presented because the presentation coincides with the one the evaluation value is stopped, the subject the adjustment operation Execute more comfortably.

However, in the hearing aid fitting device according to the third embodiment of the present invention as constructed above, it is considered that the subject does not respond to the evaluation value E _k within the predetermined time (the sound source presentation time T1 + the evaluation value- Receiving time T2) answers. This means that this is a case in which the setting time (the sound source presentation time T1 + the evaluation value reception time T2) has passed and the next sound source is presented while the subject is concerned with the selection of the evaluation value.

In such a case in which the solution vectors P _a , P _b,. , , for which the evaluation value has not been answered, it is in the same manner as in the hearing aid fitting device according to the second embodiment of the present invention, as shown in FIG. 6, after the presentation of the sound source which in response to the solution vectors P ₁ to P _{20 has} been processed for a hearing aid, and the evaluation of the presented sound source (including no answer) has ended, the sound source relative to the solution vectors P _a , P _b,. , , to present again for which an evaluation value has not been answered and the process for obtaining E _a , E _b,. , , to repeat until the evaluation values E ₁ to E _{20 of} the solution vectors P ₁ to P _{20 are} all received.

Claims (7)

1. Hearing aid fitting device, comprising:
an initial solution setting means ( 2 a) for determining an initial group of a solution vector to be renewed;
a parameter writing device ( 2 b) for converting the solution vector into setting parameter values of a hearing device ( 3 ) and for writing the parameter values into a hearing device parameter storage element ( 4 ) of the hearing device;
an evaluation value receiving means (2 c) for obtaining a valuation value of a subject relative to each solution vector;
an optimal solution estimating device ( 2 d) for estimating an optimal solution based on a value for each solution vector and the evaluation value of each solution vector;
a sound source storage device ( 1 a) for storing a sound source for the subject to evaluate each solution vector;
a sound source presentation device ( 1 d) for presenting the sound source to the hearing aid; and
where the sound source is an ambient sound. 2. Hearing aid adaptation device according to claim 1, wherein the sound source ei ne variety of ambient sounds and each an optimal solution vector is estimated relative to each ambient sound. 3. Hearing aid adaptation device according to claim 1 or 2, wherein the sound source presented by the sound source presentation device ( 1 d) is input into an external electrical input connection ( 8 e) of the hearing device ( 8 ). 4. Hearing aid adaptation device according to claim 1, 2 or 3, wherein the sound source storage device ( 1 a) and the sound source presentation device ( 1 d) are interconnected by a communication line. 5. Hearing aid fitting device, comprising:
an initial solution setting means ( 2 a) for determining an initial group of a solution vector to be renewed;
a parameter writing device ( 2 b) for converting the solution vector into setting parameter values of a hearing device ( 3 ) and for writing the parameter values into a hearing device parameter storage device ( 4 ) of the hearing device;
an evaluation value receiving means (2 c) for obtaining a valuation value of a subject relative to each solution vector;
an optimal solution estimating device ( 2 d) for estimating an optimal solution based on a value of each solution vector and the evaluation value relative to each solution vector;
sound source presentation means ( 12 ) for presenting a sound source to the subject for evaluating each solution vector to the hearing aid; and
a timer device ( 11 ) for the sound source presentation device ( 12 ) for presenting the sound source in an order at fixed time intervals. 6. Hearing aid fitting device, comprising:
an initial solution setting device ( 2 a) for determining an initial group for a solution vector to be renewed;
a parameter writing device ( 2 b) for converting the solution vector into setting parameter values of a hearing device ( 3 ) and for writing the parameter values into a hearing device parameter storage element ( 4 ) of the hearing device;
an evaluation value receiving means (2 c) for obtaining a valuation value of a subject relative to each solution vector;
an optimal solution estimating means ( 2 d) for estimating an optimal solution based on a value of each solution vector and the evaluation value relative to each solution vector;
sound source presentation means ( 12 ) for presenting a sound source to a subject for evaluating each solution vector to the hearing aid; and
a sound source controller (13), (c 2) that they have received to the evaluation value for controlling the timing of the sound sources presentation means (12) for presenting the sound source to the hearing device in an order in accordance with the timing for the Bewertungswert- receiving device. 7. Hearing aid adaptation device according to claim 5 or 6, wherein if there is some solution vector on which the evaluation value does not match has responded after the presentation of the sound source in relation to the the last solution vector of generation is finished, the presentation of the Sound source with respect to the solution vector on which the evaluation value has not responded, is again effected.