JPS5812500A - Hearing aid - Google Patents

Abstract

PURPOSE:To obtain a hearing aid which is corrected so that a user hears a sound as close to an original sound as possible, by eliminating such a metallic sound that an ear is stuck, or its frequency range and other sounds which cause pain through a BEF, a trap, etc. CONSTITUTION:One graphic equalizer 3 which is variable by + or -12dB per octave and uses a fundamental wave set to +10dB, one graphic equalizer 4 adjusted to a +1/3 octave, and one graphic equalizer 5 adjusted to a -1/3 octave are put in parallel operation by resistance mixing. A BEF6 is coupled with them, and then an amplifier 7 and headphones or an earphone 8 are connected, forming a hearing aid. Thus, while heating sense correction which corresponds to a user and correction based upon the Fletcher-Munson contour are performed, correction of disadvantages of an order-made hearing aid is performed corresponding to the user, obtaining a sound as close to an original sound as possible.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention aims to connect a hearing aid that eliminates the sound or sound range that gives the user a sensation of pain in the ear and another auxiliary device to an amplification device so that the user can hear the sound as close to the original sound as possible. Concerning damaged hearing aids.

Conventional hearing aids do not take into account the fact that the tone changes significantly compared to the original sound, and how the user perceives it. There were no hearing aids that could be compared to custom-made clothing that had a reduced range of sound.

I also plotted by changing the frequency and adjusting the level so that it would be heard by sounds of the same loudness, then I lowered the total level a little and plotted it against my compatriots, then I lowered the level a little and plotted the same thing. The Fletcher-Munson curve (
(a) is widely known, and it is also well known that there is a loudness control as a means of correcting this.

Furthermore, it is widely known that there are a plurality of hearing correction curves based on noise measurements and the like, and among these curves, curve A (b) is often seen in equipment catalogs. In other words, even when targeting healthy people, the frequency characteristics of the equipment used do not just have to be flat; as mentioned above, they must be corrected as the greatest common divisor. be. However, with hearing aids, the characteristics of the user's ears are not uniform and it is difficult for the tester to detect this, so high fidelity hearing aids are generally used that have characteristics within a circle. In addition, in the audio ABC published by Kyodo News, the range from several tens to hundreds of Hz is a buzzing sound, the range above that is a pounding sound, and the range from several hundred to 2,000 Hz is no sound. It affects things like pushing out or retracting, and in the range of several hundred Hz, there is a sound that feels like being hit on the head or forehead, and in the range slightly higher than 2,000 Hz, there is the sound of the secretary that stings the ears. The author, Mr. Segawa, skillfully expresses that there is a brilliance, sparkle, and sharp sound in the higher range, and that there is a shinshinshanshan, a floating, light feeling in the higher range. ing. Also, as often seen in speaker catalogs, sounds coming from 30 degrees to the side (C) or 60 degrees to the sides (D) have higher frequencies than sounds coming from the front. It is well known that there is a lot of attenuation in the sound range. Also, as written by Raymond Cook and written by Mr. Asano, there is a measurement microphone (1) for the speaker (1).
2) If we plot the output sound pressure level while keeping the position constant and changing the frequency continuously, we can see that the directional characteristics are more affected by the change in frequency than the change in the direction of the sound. According to the cited example, the sound (E) coming from the side of 15 degrees is 20dz dip at a temperature of 2,000 to 3,000 Hz, and the sound (G) coming from the side of 30 degrees is fired at a temperature slightly higher than 2,000 Hz. The sound (chi) with a dip of about 20 degrees and coming from the side at 45 degrees has a dip of more than 30 db at about 2,000 Hz.
If it comes from the 0° side, it will not cause extreme pain to the person. Furthermore, according to Raymond Cook, the sound coming from the side is attenuated by more than 10 db compared to the sound coming from the front, but only after passing through 13KHZ, and the sound does not dip as mentioned above. Considering that there is a difference of several db in other ranges, I feel that there is something fateful about the range slightly higher than about 2,000 Hz. In other words, normal people are saved because the sound rarely comes directly in front of them, and for people with disabilities who use earphones, the sound comes directly in front of their eardrums, no matter which way they turn. Therefore, the only place that can be saved is within k. This is actually the reason why many elderly people who own hearing aids do not want to use them on a daily basis because they complain that they hurt their ears or give them headaches, which can lead to traffic accidents. I realized that there might be a hidden cause.

So, as a rough experiment, we used a 38cm speaker with a tweeter in the center to make the sound come from in front of the elderly person, and played the CR oscillator sound at 2KHZ. I tried adjusting the attenuation to about 10 db (according to the meter attached to the amplifier) in an inverted chevron shape over an octave in the center. Although the frequency was off, I was able to confirm that there is a range of sounds that does not hurt the ears when attenuated. So when I listened to it through headphones, I found that although it wasn't very clear, there was a part that would be good to have it output around 8KHZ.
When I attenuated it a little with the control, it was 16KH.
There were no signs of ear pain with the Z. So I tested several other people in the same way, but the results were not as good as they were, and there was no tendency to overturn it. Therefore, based on this result, it is extremely dangerous to make a quick judgment, but as a general rule, the sound or range (nu) that feels like it stings the ears is attenuated in an inverted mountain shape from several db to 20-odd db (center frequency There are individual differences in the amount of attenuation), and in addition, there are individual ranges that are best attenuated, and the narrower the band width, the better.
There are strong individual differences in the need for loudness control), and it seems to be around several thousand kilohertz, so even for elderly people, the simultaneous use of loudness control was effective. That is, activate the loudness control, raise the bass range of the tone control by 1 scale, lower the range above 5KHz by 1 scale, and lower the tone control by 1 scale.
When we cut below 0KHZ to make the frequency response undulate, we heard that the tone of a song was very similar to the tone we had heard in the past.There are also individual differences, and it takes time and effort to measure, but it is customizable. -It will be possible to make made-in-house hearing aids.

Therefore, by using a graphic equalizer that is variable by 12 db per octave, we set all of them to the 10 db position (that is, each lever can be lowered by 22 db if necessary), and by the fundamental wave, one (3) and one third octave. One unit shifted to the rear (
4) and ■ one (5) shifted by 1/3 octave,
Parallel operation with low resistance mixing, connected to band elimination filter (BEF) (6), connected amplifier (7) and headphones or earphones (8)
Initially, a sound of several hundred Hz is played to determine the level, and then a synthesized sound, music or speaking voice from the patient's memory is played, and the equalizer is adjusted to create a sound that stings the patient's ears. Lower the area where the image is applied by several to 20 db,
If necessary, the range of hundreds of Hz is lowered by several db and a band elimination filter (6) is used to eliminate the painful sounds. Then, since it becomes an order state, the equalizer part (A) can be replaced by the fundamental wave, ■1/3 octave, or ■1/3 octave once for the above test result. (If you examine the characteristics when three units are operated in parallel, for example, at every 50 Hz or every lever scale, and make a graph of the numerical table, it will be the same as digitized, and although the problem of phase distortion remains) ,
It is easy to obtain a more complex characteristic curve using one graphic equalizer from Company A, which has a width of 1/3 octave and can be adjusted over 20 bands, so when replacing it,
You can immediately know which one of the three to choose. After completing a considerable number of such practical tests, you will know the greatest common divisor of the parts that need to be made variable and the parts that can be fixed, so leaving some external parts (9) aside, I. It can be converted into C or LSI.

That is, according to what is conventionally known, 31.5Hz
If you lower the area by 6db and raise the area around 160Hz by 2db,
This eliminates the dullness in the bass range, so this part can be fixed, and the high frequencies should be played down gently to reduce distortion, and play as far as possible to other frequencies, making the sound crisp and clear to the ears. It is only necessary to attenuate the sound or sound range that gives a piercing feeling (nu), the area of several hundred Hz (wo), and the area of several thousand Hz (ru), and only two to several areas need to be varied. The parts other than this variable device can be easily solidified as a circuit including a large number of CRs, and a preamplifier (10) (early graphic equalizers do not have a built-in amplifier, so It should be noted that the insertion loss was about 12 db) and a low-output amplifier (ll) together to create an LSI (12). If the size is allowed to increase, connecting stereo headphones (13) to the 1-amplification system so that the sound can be heard equally by both ears is extremely effective in stabilizing emotions. If you use two systems of microphones and amplifiers to make it stereo, it will be even better because you will get a sense of direction, and the parts that cause pain will be deleted, and the other parts will be shaped to supplement the tone. , you can take this with you on a trip or go to a vaudeville show, or use a high-quality stereo microphone (1
It won't be long before you'll be able to take your 4) with you to a music concert.

The above is an example using the graphic equalizer and band elimination filter (6), but
It is also possible to change to a combination of filters, devices with similar functions (such as channel drivers), or traps.The multiple external components (9) can be made into several types of composite circuits, and one type of them can be attached to achieve the purpose. However, it is even better to create a state in which you can listen without listening by switching a switch by installing circuits that lower the level (with the request of the same applicant). It is even better if you do this.

For the above test, the presentation by Mr. Ebara on the model signal generation method and the explanation about the program sound model signal generation device by NHK Giken and K Company were used as references, and other materials and the above-mentioned Raymond Cook According to his opinion, it is well known that not only tests using pink noise and burst waves as generally practiced, but also tests using mixed liquids, modulated waves, and double modulated waves are necessary.

[Brief explanation of the drawing]

1 to 3, FIGS. 5 and 6 are frequency characteristic curves, FIG. 4 is a plan view, and FIGS. 7 to 10 are schematic connection diagrams. (1). ．． ．． Speaker, (2). ．． ．． Measuring microphone, (
2a). ．． ．． Microphone placed 15 degrees laterally (2b).
．． ．． Microphone provided at 30° side (3). ．． ．． One unit based on the fundamental wave, (4). ．． ．． ■One unit shifted by 1/3 octave, (5). ．． ．． ■One unit shifted by 1/3 octave, (6). ．． ．． Band elimination filter, (7
). ．． ．． Amplifier, (8). ．． ．． Earphones, (9). ．． ．．
External parts, (10). ．． ．． Amplifier, (11). ．． ．． Low power amplifiers, (12) and (12a). ．． ．． LSI, (
13). ．． ．． Headphones, (14). ．． ．． Stereo microphone (A). ．． ．． Equalizer part, (a). ．． ．． Fletcher-Munson curve, (b). ．． ．． A curve, (c).
．． ．． 30° lateral, (d). ．． ．． 60° lateral, (e). ．．
．． Sound coming from 15 degrees side (G). ．． ．． Sound coming from 30 degrees side (chi). ．． ．． Sound coming from 45 degrees side (nu).
．． ．． A sound or range of sounds that feels like it stings the ears (ru). ．． ．． Around several thousand HZ (around 8,000 HZ), (wo). ．． ．．
At several hundred Hz (sound range). Patent applicant: Yasuro Sato

Claims (1)

[Claims] 1. Sounds that feel like they sting the ears (for healthy people) are likely to be in a higher range than 1.5 to 2 KHZ)
Hearing aids in which that range and other distressing sounds are removed using a band elimination filter (BEF) or trap 2. In order to hear the original sound closer to the original sound by taking into account multiple auditory corrections in healthy people and corrections for the Fletcher-Munson curve, and by supplementing the characteristics of the ear, a combination of filters, a graphic equalizer, or a device with a similar effect is added. A hearing aid according to claim 1 connected to a hearing aid.