Let me see who is speaking in such a strange voice.

to be honest,

Every time Rong Ge finished shooting a video,

I am too embarrassed to do the post-production myself.

It's not that I'm not confident about my image.

Mainly, every time I listen to my own voice,

Everyone feels weird.

Is this really my voice?

(Copyrighted image from the gallery, no permission to reprint)

I guess you may have the following questions:

Why do I always hear my own voice on social media?

Why do you all feel so awkward?

But listen to other people's voices,

It seems to be no different from what you usually hear?

To understand this problem,

This brings us back to the generation and propagation of sound.

We know that

All sounds are produced by vibrations.

For example, the reason why the guitar makes a sound is because

This is because the vibration of the strings drives the surrounding air.

The two together produce a beautiful sound.

(Copyrighted image from the gallery, no permission to reprint)

And we talk,

It is produced by the vibration of the vocal cords.

The two elastic membranes in the middle of our larynx,

That is, the vocal cords.

Between the two vocal cords,

There is also a gap called the glottis.

Contraction of the muscles around the larynx

Can relax or tighten the vocal cords

That is, making the vocal cords thicker or thinner,

It can also control the glottis to open or close.

So the exhaled air flows through the glottis

Let the vocal cords vibrate to produce sound.

By controlling the tightness of the vocal cords,

Make people make different pitches of sound.

(Copyrighted image from the gallery, no permission to reprint)

Let’s talk about the propagation of sound.

We talked about this before in the episode "Bone Conduction Headphones".

There are two ways we hear sounds:

Air conduction and bone conduction.

You can review it.

In daily life,

Sound is mostly conducted through air.

In this form of communication,

If the sound is far from our ears,

The energy of sound is rapidly lost during propagation.

As for bone conduction,

Because it is close to our body.

Compared to air conduction,

Bone conduction will definitely be better

Ensure the original timbre and quality of the sound.

A very intuitive example is

When we eat cookies,

You may hear loud chewing noises.

But the people around you might not be able to hear it at all.

This also illustrates from the side

Why wearing headphones for long periods of time can be harmful.

(Copyrighted image from the gallery, no permission to reprint)

The sounds we normally hear,

All of this is transmitted through the air into the ear.

In this process,

The high frequency part of the sound

Some of it has been absorbed by the air.

Its own energy has weakened.

Not much impact on the ears.

But wearing headphones is different.

Especially for in-ear headphones, the sound source is very close to the inner ear.

The sound wave conduction range is small and concentrated.

The sound pressure is directly transmitted to the inner ear and concentrated on the eardrum.

There is no room for buffer.

Wearing headphones for a long time will not only cause hearing fatigue,

It can also lead to problems such as hearing loss.

In the last episode about bone conduction headphones, Rong Ge also said,

Children who take online classes can try bone conduction headphones.

Reduce hearing damage.

Finally, back to the beginning of the problem,

Why does the recorded sound weird?

When we speak,

Sound is transmitted through both of the above methods at the same time.

They are transmitted to the ears through air vibrations.

Through the mouth,

Passing through teeth, gums, upper and lower jaws, etc.

Directly to the inner ear.

It is equivalent to the result of comprehensive processing.

The sound recorded by electronic equipment,

It only transmits sound through the air.

Converted into electrical signals and recorded.

Then it is restored through the "electric-to-acoustic" conversion system.

Finally, it came out of the speakers.

Transmitted to the ears through the air.

The part that is transmitted through the bones to the inner ear is missing.

At the same time, in the composition of sound,

Sounds with longer wavelengths, also known as bass,

It will be easier to pass through body tissue to reach the ear.

Normally, I hear my own voice.

That was a natural mix.

It is generally low-key and magnetic.

That's why I listen to myself.

That's why I think it sounds better.

If you want to fully restore

Let yourself hear your own voice.

Rongge thinks that

I'm afraid bone conduction headphones alone are not enough.

It has to be used with a throat vibration microphone.

Just after mixing like this,

You may not recognize my voice!

Source: China Digital Science and Technology Museum