Chapter 34 Hearing Aids

Generally speaking, the frequency range of sound that a normal person can hear is between 20 hertz and 20 kHz. But in reality, this is a limit, and most people are in a section of it, and few people are able to touch the edge of these frequencies.www.biquge.info

In addition, hearing is also related to age, and as we get older, our perception of high-frequency sounds decreases, for example, sounds above 16 Hz are basically inaudible.

According to the classification of sound waves, those below 20 Hz are called infrasound, while those above 20 kHz are called ultrasound, both of which are not perceptible to the human ear.

And is this actually the case?

It turns out that some blind people can completely break through this limit and directly praise the forbidden area of human sonic waves or ultrasounds.

For example, an existence like Jingjing Girl can hear her own heartbeat ten meters away without using a hearing assistive device, and I don't know what to do if I bring the device.

He was a little curious about what it would be like when Jingjing got the hearing aid he had made.

Yi Xiaotian has accumulated a good amount of programming and the work went smoothly, and it took more than four hours to finally complete the editing of the core algorithm of the hearing aid before dawn.

The completion of the core algorithm editing is a phased progress for Yi Xiaotian, which indicates that his software problems have been solved nearly eighty percent.

Because the hearing aid is just a simple auxiliary instrument and does not require any operating software, Yi Xiaotian can save a lot of time without considering the user experience.

Then Yi Xiaotian will install the hardware of the hearing assistive instrument. This is the rarest thing for him.

According to the workflow of the human ear, we can see that the principle of this device is not difficult, the requirement is only to produce and receive sound, but then again, the principle is not difficult to understand does not mean that it is easy to manufacture.

It is not easy to make this instrument, according to Yi Xiaotian's calculations, he has at least another core motherboard with a high computing speed. A device that is sensitive to receiving sound, a device that is able to release sound.

But fortunately, Yi Xiaotian still has some connections, because he has worked long enough in Liu's father's place, and he often takes out some more practical small objects, such as what air freshener, car stereo, free radio, and a series of small objects such as dash cams, etc., for this reason, a lot of good things in Liu's father were picked up by Yi Xiaotian.

For example, the main board on this wind shuttle, the thermal device on the thermostat, the core computing device on the matrix, and some advanced core modules that have not been destroyed by the technical model, the receiving device of the magic network signal receiver, the sound control device on the magic red stereo, and so on.

And the main board of this wind-shaped shuttle is one of the few good things that Liu's father has.

The Hurricane is one of the most popular types of shuttle cars among young people in the Federation in the past two years.

Streamlined design, one-piece body, full of science fiction color, accelerating from zero to 100 kilometers in just 3.8 seconds, and the top speed can reach 300 to 500 kilometers per hour.

However, the wind-shaped shuttle can run so fast, in addition to the Fengxing three-technique module newly developed by the Federation Shangjing Jixia School Palace, it is his motherboard that is the most important.

But now he is a little hesitant, this motherboard is rare and expensive on the one hand, and more importantly, the failure rate that needs to be borne by doing experiments.

I think that when Edison invented the light bulb, he tried to find a suitable filament, but he failed thousands of times!

Although Yi Xiaotian designed this instrument before making the hearing aid, no one dared to guarantee that the experiment would be successful at the first time.

But after a battle between heaven and man, Yi Xiaotian still took out the main board of the wind shuttle and the sound collection and release device from the treasure chest, and then began the intense debugging work.

The work proceeded quickly, and within a few minutes the installation was completed in a few days.

Looking at the hearing aid device in front of him that was the size of a power bank, Yi Xiaotian did not hesitate to put on a thick blindfold.

This was a very unique feeling for him, because when he wrote the core program, he wisely used the information that the auditory nerve could accept, and in this way, he could receive even the slightest fluctuation.

For example, because of the thick blindfold, he basically can't see everything in his rental house, but he feels that his current self is like a radio, and he can accept all the sound wave information in the space indiscriminately, and even the heartbeat of a few people tiptoeing outside and sneaking into the courtyard to play games all night, he can hear it clearly.

He was basically satisfied with the sound receiving device, and now he had to test the sound generating device.

Based on safety and cost considerations, Yi Xiaotian imitates the crunchy sound made by the friction between the human tongue and the upper jaw.

This was a chance discovery when he was watching dolphins in the aquarium, and it was still a little difficult to make this sound. This crunch is not made through the vocal cords, but by controlling the friction between the tongue and the upper jaw, as well as the use of air.

Because he found that the sound made after rubbing against the air actually formed a very clear echo.

The sound then re-converged from all directions into his hearing aid in a short period of time, and then converted into a pulse signal that it could hear, which he received.

This kind of echo is not a simple linear structure, it is very different from the previous sound, and the intensity and timing of the echo are different, layered on top of each other, and there is a three-dimensional feeling.

Yi Xiaotian found that just by making this one sound, he could clearly explore the environmental structure in the room, and naturally formed a three-dimensional picture in his mind.

This unusual experience surprised Yi Xiaotian very much, as a scientist, he has a very strong curiosity and research enthusiasm for anything he doesn't know.

He is such a character, this kind of exploration of unknown territory has an inexplicable attraction for him, if he does not understand his essence, his heart is as if there are countless ants biting, it is almost crazy.

So the room remembered the sound of "da-da" from time to time.