JP4166764B2 - Determination of vent dimensions for ear-shaped hearing aids - Google Patents
Determination of vent dimensions for ear-shaped hearing aids Download PDFInfo
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本発明は、オーダメイドの耳あな形補聴器に形成されるベントの大きさを決定するための耳あな形補聴器のベント寸法決定方法に関する。 The present invention relates to a method for determining a vent size of an earlobe hearing aid for determining a size of a vent formed in an order-made earlobe hearing aid.
オーダメイドの耳あな形補聴器には、他の型式の補聴器と同様に、装用時のこもり感を軽減するため、外耳道内と外界をバイパスするベントが設けられている。ベントの寸法、特にベントの孔の大きさが適切でないと、ハウリングが生じ易くなるので、ベントの孔の寸法は慎重に決定されている。 As with other types of hearing aids, order-made ear-shaped hearing aids are provided with vents that bypass the inside of the external auditory canal and the outside world in order to reduce the feeling of congestion during wearing. The dimensions of the vent hole are carefully determined because howling is likely to occur if the vent dimensions, particularly the vent hole size, are not appropriate.
従来、ベントの孔の寸法は、図５に示すように、補聴器装用者のオージオグラムに基づいて決定されることが知られている。
先ず、オージオグラムの指定周波数の最小可聴閾値の平均値α[ｄＢ]を求め、この平均値α[ｄＢ]が、例えば３０ｄＢ以下の場合にはベントの孔径が大のものを、４５ｄＢ以下の場合にはベントの孔径が中のものを、６０ｄＢ以下の場合にはベントの孔径が小のものを、６０ｄＢを超える場合にはベントの孔径が極小のものを、設定する。そして、設定した孔径からなるベントを備えたシェルを作製している。なお、ベントの長さについては、予め補聴器装用者の外耳道の寸法を採取し、この外耳道の寸法に基づいてシェルの外形が決定され、このシェルの外形に基づいて設定されている。
Conventionally, it is known that the size of the vent hole is determined based on the audiogram of the hearing aid wearer as shown in FIG.
First, the average value α [dB] of the minimum audible threshold value of the designated frequency of the audiogram is obtained, and when the average value α [dB] is, for example, 30 dB or less, the vent hole diameter is large, and the value is 45 dB or less. The vent hole diameter is set to the medium, the vent hole diameter is set to a small value when it is 60 dB or less, and the vent hole diameter is set to a minimum value when it exceeds 60 dB. And the shell provided with the vent which consists of the set hole diameter is produced. In addition, about the length of a vent, the dimension of the ear canal of a hearing aid wearer is extract | collected previously, the external shape of a shell is determined based on the dimension of this external ear canal, and is set based on the external shape of this shell.
しかし、従来のベントの孔寸法決定方法では、補聴器を作製した際にベント孔の大きさが原因でハウリングするかの判断が難しく、実際にオーダメイドの耳あな形補聴器を装用した際に、かなり高い確率でハウリングが発生していた。
そこで、ハウリングが発生しないようにするためには、補聴器シェルを再度作製する必要があり、コスト高になるという問題があった。
However, with the conventional vent hole size determination method, it is difficult to determine whether or not howling will occur due to the size of the vent hole when the hearing aid is manufactured, and when a custom-made ear-shaped hearing aid is actually worn, Howling occurred with high probability.
Therefore, in order to prevent howling from occurring, it is necessary to make a hearing aid shell again, which causes a problem of high costs.
本発明は、従来の技術が有するこのような問題点に鑑みてなされたものであり、その目的とするところは、オーダメイドの耳あな形補聴器にとって適切なベントの大きさを決定することができる耳あな形補聴器のベント寸法決定方法を提供しようとするものである。 The present invention has been made in view of such problems of the prior art, and an object of the present invention is to determine an appropriate vent size for an order-made ear-shaped hearing aid. It is an object of the present invention to provide a method for determining the vent dimensions of an earlobe hearing aid.
上記課題を解決すべく請求項１に係る発明は、耳あな形補聴器のベントの寸法を決定する方法であって、聴力レベルや予め設定するベントの孔の大きさなどから補聴器装着状態の等価回路及び補聴器測定状態の等価回路の各定数を設定する回路定数設定工程と、前記補聴器装着状態の等価回路の出力ＲＥＡＬoutと前記補聴器測定状態の等価回路の出力２ｃｃoutの差（ＲＥＡＬout−２ｃｃout）から求めたＲＥＣＤ値を目標出力音圧Ｐｒに加算して補聴器装用時の外耳道内音圧Ｐｏ（＝Ｐｒ＋ＲＥＣＤ値）を算出する外耳道内音圧算出工程と、外耳道内音圧Ｐｏにベントによる外耳道内音圧の減衰量ＶentＤecを加算して外界側ベント端の漏れ音圧Ｐｈ（＝Ｐｏ＋ＶentＤec）を算出する漏れ音圧算出工程と、外界側ベント端の漏れ音圧Ｐｈに外界側ベント端からマイクロホンに至るまでの減衰量Ｐａを加算した音圧Ｐｍ（＝Ｐｈ＋Ｐａ）に補正値Ｐｃを加算してマイクロホンへの帰還音圧Ｐｆ（＝Ｐｍ＋Ｐｃ）を算出する帰還音圧算出工程と、帰還音圧Ｐｆに対して目標出力音圧Ｐｒを得るための入力音圧Ｐｉが所定値以上のハウリングマージンを有しているか否かを判定する判定工程からなり、判定工程で入力音圧Ｐｉが所定値以上のハウリングマージンを有していないと判定された場合には、ベントの孔の大きさを一段階小さいものに再設定し、入力音圧Ｐｉが所定値以上のハウリングマージンを有するまでベントの寸法決定作業を行うものである。 In order to solve the above-mentioned problem, the invention according to claim 1 is a method for determining the dimensions of the vent of the ear-shaped hearing aid, which is an equivalent circuit of the hearing aid wearing state based on the hearing level, the size of the vent hole set in advance, and the like. And a circuit constant setting step for setting each constant of the equivalent circuit in the hearing aid measurement state , and a difference (REALout−2ccout) between the output REALout of the equivalent circuit in the hearing aid wearing state and the output 2ccout of the equivalent circuit in the hearing aid measurement state . and the ear canal sound pressure calculation step of RECD value by adding the target output sound pressure Pr to calculate the hearing aid wearing when the ear canal sound pressure Po (= Pr + RECD values), the external auditory canal sound pressure by venting the ear canal sound pressure Po A leakage sound pressure calculating step of calculating the leakage sound pressure Ph (= Po + VentDec) at the outside vent end by adding the attenuation amount VentDec, and the outside sound pressure Ph at the outside vent end. Feedback sound pressure calculation process by the summing the correction value Pc to the sound pressure Pm attenuation Pa obtained by adding from cement end to the microphone (= Ph + Pa) for calculating a feedback sound pressure Pf to the microphone (= Pm + Pc) and And a determination step for determining whether or not the input sound pressure Pi for obtaining the target output sound pressure Pr with respect to the feedback sound pressure Pf has a howling margin equal to or greater than a predetermined value . In the determination step, the input sound pressure Pi is determined. Is determined not to have a howling margin greater than a predetermined value , the vent hole size is reset to one step smaller until the input sound pressure Pi has a howling margin greater than a predetermined value. The work for determining the dimensions of the vent is performed.
請求項２に係る発明は、請求項１記載の耳あな形補聴器のベント寸法決定方法において、予め設定するベントの孔の大きさを、可能な限り大きな値にするようにした。 According to a second aspect of the present invention, the vent hole size determining method for the ear-shaped hearing aid according to the first aspect is such that the size of the vent hole set in advance is as large as possible.
請求項３に係る発明は、請求項１記載の耳あな形補聴器のベント寸法決定方法において、予め設定するベントの孔の大きさを、オージオグラムの指定周波数の最小可聴閾値の平均値から求めるようにした。 According to a third aspect of the present invention, in the vent dimension determining method for the earlobe hearing aid according to the first aspect, the size of the vent hole to be set in advance is obtained from an average value of the minimum audible threshold values of the designated frequency of the audiogram. I made it.
以上説明したように請求項１に係る発明によれば、目標出力音圧を得るための入力音圧が、帰還音圧に対して所定のハウリングマージンを有しているか否かが判定されるので、ハウリングを発生しない適切なベントの寸法を決定することができる。従って、補聴器シェルを再度作製することが無くなり、製造コストの低減が図れる。 As described above, according to the invention according to claim 1, it is determined whether or not the input sound pressure for obtaining the target output sound pressure has a predetermined howling margin with respect to the feedback sound pressure. Appropriate vent dimensions that do not cause howling can be determined. Therefore, the hearing aid shell is not manufactured again, and the manufacturing cost can be reduced.
請求項２に係る発明によれば、順次ベントの大きさを小さくしながらハウリングを発生しないベントの寸法を求めていくので、最適なベントの寸法を決定することができる。 According to the second aspect of the present invention, since the dimension of the vent that does not generate howling is obtained while sequentially reducing the size of the vent, the optimum dimension of the vent can be determined.
請求項３に係る発明によれば、予め大まかなベントの寸法が決まるので、迅速にハウリングを発生しない適切なベントの寸法を決定することができる。 According to the third aspect of the present invention, since the rough vent dimensions are determined in advance, it is possible to quickly determine an appropriate vent dimension that does not generate howling.
以下に本発明の実施の形態を添付図面に基づいて説明する。ここで、図１は耳あな形補聴器の装用状態の概略説明図、図２は本発明に係る耳あな形補聴器のベント寸法決定方法による作業手順を示すフローチャート、図３は補聴器装用状態の音響回路の等価回路図、図４は補聴器測定状態の音響回路の等価回路図である。 Embodiments of the present invention will be described below with reference to the accompanying drawings. Here, FIG. 1 is a schematic explanatory diagram of the wearing state of the earlobe hearing aid, FIG. 2 is a flowchart showing a work procedure according to the vent dimension determining method of the earlobe hearing aid according to the present invention, and FIG. 3 is an acoustic circuit in the hearing aid wearing state. FIG. 4 is an equivalent circuit diagram of the acoustic circuit in the hearing aid measurement state.
ベント１を有するオーダメイドの耳あな形補聴器２を装用した場合には、図１に示すような状態になる。そして、外耳道３に耳あな形補聴器２を装着した状態で、イヤホン４に入力された音響信号により補聴器２の先端２ａと鼓膜５で形成される空間６の音圧は、イヤホン４から鼓膜５までに存在する種々の要素から決定される。 When the order-made ear-shaped hearing aid 2 having the vent 1 is worn, the state is as shown in FIG. The sound pressure in the space 6 formed by the distal end 2 a of the hearing aid 2 and the eardrum 5 by the acoustic signal input to the earphone 4 with the ear-shaped hearing aid 2 attached to the ear canal 3 is from the earphone 4 to the eardrum 5. Determined from various factors.
これらの要素としては、イヤホン４、イヤホン４と補聴器音口２ｂまでをつなぐチューブ７、ベント１の孔１ａの大きさ、ベント１の長さ、外耳道３に耳あな形補聴器２を装着した状態での補聴器２の先端２ａと鼓膜５で形成される空間６の容積、鼓膜５の音響インピーダンスなどが挙げられる。８はマイクロホン、９は耳介である。 These elements include the earphone 4, the tube 7 that connects the earphone 4 to the hearing aid sound outlet 2 b, the size of the hole 1 a of the vent 1, the length of the vent 1, and the ear hearing aid 2 attached to the ear canal 3. The volume of the space 6 formed by the distal end 2 a of the hearing aid 2 and the eardrum 5, the acoustic impedance of the eardrum 5, and the like. 8 is a microphone, and 9 is an auricle.
本発明に係る耳あな形補聴器のベント寸法決定方法を用いた作業は、図２に示すような手順に従って進められる。この作業は、パーソナルコンピュータを用いて行われる。
先ず、ステップＳＰ１において、ベント１の孔１ａの大きさを設定する。ここでは、ベント１の孔１ａとして、先ず装用時のこもり感を考慮して、可能な限り大きい孔１ａを設定する。孔１ａの大きさの種類は、予め複数（例えば、７種類）用意しておく。
The operation using the method for determining the vent size of the earlobe hearing aid according to the present invention proceeds according to the procedure shown in FIG. This operation is performed using a personal computer.
First, in step SP1, the size of the hole 1a of the vent 1 is set. Here, as the hole 1a of the vent 1, first, a hole 1a that is as large as possible is set in consideration of a feeling of stagnation during wearing. A plurality of types (for example, seven types) of sizes of the holes 1a are prepared in advance.
他に、背景技術で述べたように、オージオグラムの指定周波数の最小可聴閾値の平均値α[ｄＢ]を求め、この平均値α[ｄＢ]の大きさから好ましいと考えられる孔１ａの大きさを４種類（大、中、小、極小）の中から設定することもできる。
なお、ベントの長さは、予め補聴器装用者の外耳道の寸法に基づいて決定されるシェルの外形から設定されている。
In addition, as described in the background art, the average value α [dB] of the minimum audible threshold value of the designated frequency of the audiogram is obtained, and the size of the hole 1a considered to be preferable from the size of the average value α [dB]. Can be set from among four types (large, medium, small, and minimal).
The length of the vent is set based on the outer shape of the shell determined in advance based on the dimensions of the ear canal of the hearing aid wearer.
次いで、ステップＳＰ２において、装用者の聴力レベルやステップＳＰ１で設定したベント１の孔１ａの大きさなどから耳あな形補聴器２を装着した状態における音響回路の等価回路の各定数、及び補聴器の出力を測定する場合における音響回路の等価回路の各定数を設定する（回路定数設定工程）。 Next, in step SP2, the constants of the equivalent circuit of the acoustic circuit in the state in which the ear-shaped hearing aid 2 is worn from the hearing level of the wearer, the size of the hole 1a of the vent 1 set in step SP1, and the output of the hearing aid Each constant of the equivalent circuit of the acoustic circuit in the case of measuring is set (circuit constant setting step).
耳あな形補聴器２を装用した状態の音響回路の等価回路１０は、図３に示すように、注文時の機種、装用者のオージオグラムや装用者の耳形などに基づく、イヤホン４の等価回路の定数（Ｒ１，Ｒ２，Ｃ１，Ｃ２，Ｌ１，Ｌ２）、イヤホン４と補聴器音口２ｂまでをつなぐチューブ７の等価回路の定数（直径ｒ１，長さｌ１）、ベント１の等価回路の定数（直径ｒ２，長さｌ２）、補聴器２の先端２ａと鼓膜５で形成される空間６の容積の等価回路の定数（直径ｒ３，長さｌ３）、平均的な鼓膜５の等価回路の定数（Ｒ３，Ｒ４，Ｌ４，Ｌ５，Ｃ３，Ｃ４）が設定されて構成される。 As shown in FIG. 3, the equivalent circuit 10 of the acoustic circuit in the state where the ear-shaped hearing aid 2 is worn is equivalent to the earphone 4 based on the model at the time of ordering, the wearer's audiogram, the ear shape of the wearer, and the like. Constants (R1, R2, C1, C2, L1, L2), constants of the equivalent circuit (diameter r1, length l1) of the tube 7 connecting the earphone 4 and the hearing aid sound outlet 2b, constants of the equivalent circuit of the vent 1 ( Diameter r2, length l2), the equivalent circuit constant (diameter r3, length l3) of the volume of the space 6 formed by the tip 2a of the hearing aid 2 and the eardrum 5, the equivalent circuit constant (R3) of the average eardrum 5 , R4, L4, L5, C3, C4) are set.
また、鼓膜５の代わりに補聴器特性試験装置で使用される２ｃｃカプラで補聴器の出力を測定する場合の音響回路の等価回路１１は、図４に示すように、イヤホン４の等価回路の定数（Ｒ１，Ｒ２，Ｃ１，Ｃ２，Ｌ１，Ｌ２）、イヤホン４と補聴器音口２ｂまでをつなぐチューブ７の等価回路の定数（直径ｒ１，長さｌ１）、２ｃｃカプラの等価回路の定数（直径ｒ４，長さｌ４，Ｃ５）が設定されて構成される。 Further, the equivalent circuit 11 of the acoustic circuit when measuring the output of the hearing aid with a 2cc coupler used in the hearing aid characteristic test apparatus instead of the eardrum 5 is equivalent to the constant (R1) of the equivalent circuit of the earphone 4 as shown in FIG. , R2, C1, C2, L1, L2), an equivalent circuit constant (diameter r1, length l1) of the tube 7 connecting the earphone 4 to the hearing aid sound outlet 2b, and an equivalent circuit constant of the 2cc coupler (diameter r4, length). 14 and C5) are set and configured.
ここで、イヤホン４の等価回路の各定数（Ｒ１，Ｒ２，Ｃ１，Ｃ２，Ｌ１，Ｌ２）について説明すると、Ｒ１はイヤホン４の音響抵抗でイヤホン機械振動系の抵抗を音響抵抗に換算したもの、Ｒ２は音口の音響抵抗、Ｃ１はイヤホン４の音響コンプライアンスでイヤホン機械振動系のスティフネスを音響スティフネスに換算したものの逆数（機械系から音響系への換算は、機械系の値を振動板の有効面積の二乗で割って求める）、Ｃ２振動板の前室の音響コンプライアンス、Ｌ１はイヤホン振動部の音響質量でイヤホン振動部の実効質量を音響質量に換算したもの、Ｌ２は音口の音響質量である。 Here, each constant (R1, R2, C1, C2, L1, L2) of the equivalent circuit of the earphone 4 will be described. R1 is the acoustic resistance of the earphone 4, and the resistance of the earphone mechanical vibration system is converted into the acoustic resistance. R2 is the acoustic resistance of the sound mouth, C1 is the acoustic compliance of the earphone 4, and the stiffness of the earphone mechanical vibration system is converted to the acoustic stiffness. The reciprocal of the mechanical system is converted to the acoustic system. Obtained by dividing by the square of the area), the acoustic compliance of the front chamber of the C2 diaphragm, L1 is the acoustic mass of the earphone vibrating part, the effective mass of the earphone vibrating part converted to the acoustic mass, and L2 is the acoustic mass of the sound mouth is there.
なお、２ｃｃカプラの等価回路の定数（直径ｒ４，長さｌ４，Ｃ５）は、注文時の機種、装用者のオージオグラムや装用者の耳形などによらず、一定の定数を用いる。なお、図４に示すカプラは、必ずしも２ｃｃカプラである必要はなく、Zwislockiカプラなど現時点で存在するカプラや今後作製される新たなカプラでも適用することができる。 The constant of the equivalent circuit of the 2cc coupler (diameter r4, length l4, C5) is constant regardless of the model at the time of ordering, the wearer's audiogram, the wearer's ear shape, and the like. Note that the coupler shown in FIG. 4 is not necessarily a 2 cc coupler, and can be applied to a coupler existing at present such as a Zwislocki coupler or a new coupler to be manufactured in the future.
次いで、ステップＳＰ３において、ある音圧に相当する交流電圧（例えば、１Ｖ）をイヤホン４の等価回路の入力端に入力した場合の、図３に示す等価回路１０の出力ＲＥＡＬoutと、図４に示す等価回路１１の出力２ｃｃoutを夫々計算する。そして、両者の差（ＲＥＡＬout−２ｃｃout）からＲＥＣＤ（real ear to couple difference）値を求める。 Next, in step SP3, when an AC voltage (for example, 1 V) corresponding to a certain sound pressure is input to the input terminal of the equivalent circuit of the earphone 4, the output REALout of the equivalent circuit 10 shown in FIG. The output 2ccout of the equivalent circuit 11 is calculated respectively. Then, a RECD (real ear to couple difference) value is obtained from the difference between the two (REALout−2 ccout).
更に、ステップＳＰ４において、ＲＥＣＤ値を目標出力音圧Ｐｒに加算して補聴器２を装用した状態で外耳道３に補聴器２の先端２ａと鼓膜５で形成される空間６の外耳道内音圧Ｐｏ（＝Ｐｒ＋ＲＥＣＤ値）を算出する（外耳道内音圧算出工程）。 Further, in step SP4, the RECD value is added to the target output sound pressure Pr and the hearing aid 2 is worn, and the sound pressure Po (=) in the ear canal of the space 6 formed by the distal end 2a of the hearing aid 2 and the eardrum 5 in the ear canal 3 is obtained. (Pr + RECD value) is calculated (sound pressure calculation process in the ear canal).
次いで、ステップＳＰ５において、図３に示す等価回路１０の出力ＲＥＡＬoutを入力とし、等価回路１０のＶoutを出力とした時の、ＲＥＡＬoutからＶoutまでに減衰する減衰量ＶentＤecを求める。そして、外耳道内音圧Ｐｏと減衰量ＶentＤecから外界側ベント端１ｂの漏れ音圧Ｐｈ（＝Ｐｏ＋ＶentＤec）を算出する（漏れ音圧算出工程）。 Next, in step SP5, the amount of attenuation VentDec that attenuates from REALout to Vout when the output REALout of the equivalent circuit 10 shown in FIG. 3 is input and Vout of the equivalent circuit 10 is output is obtained. Then, the leak sound pressure Ph (= Po + VentDec) at the outside vent 1b is calculated from the sound pressure Po in the ear canal and the attenuation amount VentDec (leakage sound pressure calculation step).
次いで、ステップＳＰ６において、外界側ベント端１ｂの中心とマイクロホン８の音入口部８ａまでの距離の推測値と、ベント１の孔径より、外界側ベント端１ｂからマイクロホン８の音入口部８ａに至る音圧の減衰量Ｐａを、計算する。そして、推測した減衰量Ｐａを外界側ベント端１ｂの漏れ音圧Ｐｈに加算することにより、マイクロホン８の音入口部８ａに伝達される音圧Ｐｍ（＝Ｐｈ＋Ｐａ）を算出する。 Next, in step SP6, from the estimated value of the distance from the center of the outside vent end 1b to the sound inlet 8a of the microphone 8 and the hole diameter of the vent 1, the outside vent 1b reaches the sound inlet 8a of the microphone 8 from the vent 1 hole diameter. The sound pressure attenuation Pa is calculated. Then, the sound pressure Pm (= Ph + Pa) transmitted to the sound inlet portion 8a of the microphone 8 is calculated by adding the estimated attenuation amount Pa to the leakage sound pressure Ph at the outside vent end 1b.
更に、ステップＳＰ７において、マイクロホン８の音入口部８ａに伝達される音圧Ｐｍに、補正値Ｐｃとして耳介９による漏れ音圧Ｐｈの音の反射効果がもたらす音圧上昇分、耳あな形補聴器２と外耳道３の密閉度による帰還音圧の増加分を加味する。そして、マイクロホン８の音入口部８ａに帰還する最終的な帰還音圧Ｐｆ（＝Ｐｍ＋Ｐｃ）を算出する（帰還音圧算出工程） Furthermore, in step SP7, the sound pressure increase transmitted to the sound pressure Pm transmitted to the sound inlet 8a of the microphone 8 by the reflection effect of the sound of the leaked sound pressure Ph by the auricle 9 as the correction value Pc is obtained. 2 and the increase in feedback sound pressure due to the degree of sealing of the external auditory canal 3 is taken into account. Then, a final feedback sound pressure Pf (= Pm + Pc) to be returned to the sound inlet portion 8a of the microphone 8 is calculated (feedback sound pressure calculation step).
次いで、ステップＳＰ８において、目標出力音圧Ｐｒ（例えば、８０ｄＢ）を得るための入力音圧Ｐｉと帰還音圧Ｐｆの大小関係から、ハウリングが発生するか否かを判定する（判定工程）。例えば、ハウリングマージンを６ｄＢ以上としなければならない場合には、入力音圧Ｐｉ−帰還音圧Ｐｆ≧６ｄＢという条件式が全周波数帯域（例えば、１６ポイントの周波数でもよい）で満たされなければならない。そして、この条件式が満たされる場合には、ベント１の寸法決定作業は終了し、ステップＳＰ１で設定した寸法のベント１を有するシェルが作製される。 Next, in step SP8, it is determined whether or not howling occurs from the magnitude relationship between the input sound pressure Pi and the feedback sound pressure Pf for obtaining the target output sound pressure Pr (for example, 80 dB) (determination step). For example, when the howling margin must be 6 dB or more, the conditional expression of input sound pressure Pi−feedback sound pressure Pf ≧ 6 dB must be satisfied in the entire frequency band (for example, a frequency of 16 points may be used). When this conditional expression is satisfied, the work for determining the dimensions of the vent 1 is completed, and a shell having the vent 1 having the dimensions set in step SP1 is produced.
一方、入力音圧Ｐｉと帰還音圧Ｐｆが条件式を満たさない場合には、ステップＳＰ９において、ベント１の孔１ａの大きさを一段階小さいものに再設定し、更にステップＳＰ２に戻って、条件式が満たされるまでベント１の寸法決定作業を行う。そして、入力音圧Ｐｉ−帰還音圧Ｐｆ≧６ｄＢという条件式が全周波数帯域（例えば、１６ポイントの周波数でもよい）で満たされると、ベント１の寸法決定作業は終了し、ステップＳＰ９で設定した寸法のベント１を有するシェルが作製される。 On the other hand, when the input sound pressure Pi and the feedback sound pressure Pf do not satisfy the conditional expression, in step SP9, the size of the hole 1a of the vent 1 is reset to one step smaller, and the process returns to step SP2. The dimensions of the vent 1 are determined until the conditional expression is satisfied. Then, when the conditional expression of input sound pressure Pi−feedback sound pressure Pf ≧ 6 dB is satisfied in the entire frequency band (for example, a frequency of 16 points may be satisfied), the work for determining the dimensions of the vent 1 is completed and set in step SP9. A shell is produced having a vent 1 of dimensions.
本発明によれば、オーダメイドの耳あな形補聴器において、ハウリングを発生しない適切なベントの寸法を決定することができるので、補聴器シェルを再度作製することが無くなり、製造コストの低減が図られ、オーダメイドの耳あな形補聴器の普及が促進される。 According to the present invention, in order-made ear-shaped hearing aids, since it is possible to determine the appropriate vent dimensions that do not generate howling, it is not necessary to recreate the hearing aid shell, and the manufacturing cost can be reduced. Promotion of order-made ear-shaped hearing aids is promoted.
１…ベント、１ａ…孔、１ｂ…外界側ベント端、２…耳あな形補聴器、２ａ…先端、２ｂ…補聴器音口、３…外耳道、４…イヤホン、５…鼓膜、６…空間、８…マイクロホン、９…耳介。 DESCRIPTION OF SYMBOLS 1 ... Vent, 1a ... Hole, 1b ... External side vent end, 2 ... Ear hole type hearing aid, 2a ... Tip, 2b ... Hearing aid mouthpiece, 3 ... Ear canal, 4 ... Earphone, 5 ... Tympanic membrane, 6 ... Space, 8 ... Microphone, 9 ... pinna.
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