Speaker for hearing impaired patients, "Mirai speaker"?

We introduce speakers "Mirai speaker" for patients with hearing loss and similar products.

What is "Mirai Speaker"?

"Mirai speaker" is barrier-free speaker of sound. It is a product of Sound Fun Corporation.

Sound fan official website

How do I acquire 'Mirai Speaker' by yourself?

It is possible to rent it at 2,980 yen / month.

"Mirai speaker" rental

Principle of "Mirai speaker"

I think that it is based on the following patents. The details of the principle seems to be unknown.

Patent (Universal speaker)

What is Comuoon?

"Comuoon" is a dialogue support equipment. It is a product of Universal · Sound Design Co., Ltd.

Universal · Sound Design Corporation Official website

How can I get "Comuoon" by my own?

It seems that it can purchase at 7,600 yen + 36 * 5,800 yen = 216,400 yen. It seems there are times when you can use "daily living gear tool benefit system".

About purchase method (Comuoon official website)

Principle 1 of "Comuoon" - Conversion of sound

comuoon clears the sound input from the microphone clearly and converts it into a clear sound that is easy to hear.


It seems that it converts the input sound so that it is easier to hear and output it. If you estimate from the images posted on the citation source, there is a possibility of boosting the important band for listening by EQ.

Principle of "Comuoon" 2 - Transverse Wave Speaker

"Susumushi speaker" is a speaker that applied the principle that Sumushi grinds wings and produces sounds, seems to be a hint of Comuoon.

Copernicus products for hearing impaired people to improve difficulty in hearing

I found a paper by Prof. Yoshihiro Muto, who introduced "Susumushi speaker" in the above mentioned article. In the thesis, the acoustic characteristics of the underlay bent to the music box is analyzed. It is similar to the structure of "Mirai speaker". Is the root of "Comuoon" and "Mirai speaker" the same?

"Transverse Wave Speaker" having a structure combining a piezoelectric element and a diaphragm is also introduced. Perhaps this is what is called "Sumushi speaker" or "Yokonowa speaker"?

Known and unknown phenomena of nonlinear behaviors in the power harvesting mat and the transverse wave speaker

It seems that the result of measuring the sound intensity for each distance is consistent with the result when assuming that transverse waves in the air are generated. However, since the method of deriving the three parameters used in the simulation is not described and the validity of the derived parameter is not discussed, it is not known whether the simulation result can actually exist or not.

There is also a theory that there is no transverse wave of sound, so it happens that the calculation result and the experiment result coincide, it is possible that the principle is actually based on another principle.

Speaker which can generate plane wave

Some speakers have speakers that can generate plane waves. As a result of examination, it is called by various names such as flat speaker, flat speaker, plane wave speaker, etc. There seems to be no unified way of calling.

Supposing that the essential point of "Mirai speaker" and "Transverse Wave Speaker" is plane waves rather than transverse waves, other speakers that can generate plane waves are likely to be effective for hearing loss patients as well.

I examined speakers that I can purchase individually.

F. P. S.

FPS online store

TOA Corporation

TOA PW-1230 DB Plane Wave Speaker, Black

Relationship between hearing loss and plane wave

If a plane wave comes out from "Mirai speaker" or "Transverse Wave Speaker", there is a possibility that the plane wave can be heard for the patient with hearing loss. If so, think about the reason.

Hypothesis 1 - Because it is difficult for the volume to attenuate with distance

Compared to spherical waves, plane waves tend to attenuate in volume depending on distance. Even if it is far from the speaker, it is easy to hear it, so there is a possibility that it may be easy for the hearing impaired patient to hear.

We can verify this hypothesis by comparing the easiness of listening with the plane wave and the spherical wave adjusted to the same volume at the position of the subject with respect to the subject in the same place.

Hypothesis 2 - Volume change when the ears are slightly moved is small

It is similar to hypothesis 1, but due to the influence of ear structure and room reflection, the plane wave is compared with the spherical wave, the volume change in the inner ear when slightly changing the direction of the ear or the ear position compared with the spherical wave There is a possibility that it is small.

There seems to be no one who lives with the ear position and direction fixed perfectly, so the magnitude of the volume change when moving them a little can affect the ease of hearing.

Experiment of hypothesis 1 can be verified if it is done with perfectly fixed condition of ear position and direction and condition moving little by little.

Hypothesis 3 - Because there is little reverberation

Plane waves have strong directivity, so there are few reflections in the room and reverberation sound may be reduced. There is a possibility that the amount of reverberation influences the ease of hearing.

It can be verified by measuring the amount of reverberation of the spherical wave and the plane wave and comparing the hearing easiness with the sound corrected so that the reverberation amount becomes the same with the reverb and so on.

Hypothesis 4 - Because the reverberation is simple

It is similar to hypothesis 3, but there is a possibility that the structure of the reverberation influences the ease of hearing rather than the amount of reverberation. For example, with reverb and short delay, the ease of hearing may be different even with the same amount of reverberation.

It is possible to verify by measuring the impulse response of the spherical wave and the plane wave and comparing the hearing easiness with the sound that simulates the structure of the reverberation by convolution and so on.


We introduced a speaker "Mirai speaker" for patients with hearing loss and similar products.

※ Price etc is information at the time of article writing. For the latest information please visit the official website.

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