In the elevator, Zhao Xingsheng had a dark face, and his three graduate students were all covering their mouths and laughing.

After all, on the way here, Zhao Xingsheng had already boasted to them about Gu Xiaobai's explosive high notes, as if he considered himself the number one fan.

But when they actually met, Gu Xiaobai couldn't remember his face.

You say it's irritating or not.

At this moment, in the elevator, Gu Xiaobai was looking down at him.

In such a small space, Zhao Xingsheng realized that Gu Xiaobai was really tall. Zhao Xingsheng was nearly 1.8 meters tall, which was considered tall for his age, but Gu Xiaobai was half a head taller than him.

.

Although he is still as tall and thin as a teenager and looks a bit thin, Zhao Xingsheng said with emotion that children nowadays are really well-nourished.

Zhao Xingsheng was a little embarrassed by Gu Xiaobai, and said in a rough voice: "What do you think I'm doing?"

"Add your face to the faces of important people and write it down." Gu Xiaobai said, still murmuring: "Professor Zhao, Zhao Xingsheng, crayfish, old meerkat..."

"What did you say?" When Zhao Xingsheng heard his name, the other two were a little confused and felt something was wrong.

"Associative memory." Gu Xiaobai pointed to his brain.

Zhao Xingsheng was a little hurt again. I look so mediocre, and I still need to associate memory to remember it.

It's really heartbreaking.

Opening the door of the laboratory with familiarity, Gu Xiaobai began to prepare consumables for Zhao Xingsheng, fill out the form, and turn on the equipment... Apparently he had been here many times.

Zhao Xingsheng also nodded with emotion.

The competition for the Hundred Sons on Campus program is very fierce. Not only are students competing for this spot, teachers are also competing for candidates to be the Hundred Sons on Campus.

Especially for young professors like them, it is not easy to gain a foothold in the school. If you want to grab resources, you will definitely not be able to grab other experts. But with a student from the Campus Hundred Sons Program, you have a chance to grab resources.

resources, allowing the school to tilt resources towards capital.

On the phone, he got to know Gu Xiaobai in depth with Lao Wang next door. Gu Xiaobai, who was just a freshman, was very likely to be shortlisted this year. Even if he was not shortlisted this year, in Professor Wang's own words, that is...

"If I don't make the cut next year, I will eat my guitar live in front of the principal!" said Lao Wang, the guitarist in Professor Zhao's band.

For such an outstanding student, teachers are willing to give him the green light no matter where he goes. Young doctoral supervisors and master's supervisors, whom ordinary students often only have in-depth contact with in their senior year, have now begun to guide Gu Xiaobai carefully.

Seeing Zhao Xingsheng coming, Gu Xiaobai hesitated and asked, "Teacher, are you busy?"

"It's okay, I'm just waiting for the results."

"Then can I ask you a question?" Gu Xiaobai asked.

"Let's talk." Zhao Xingsheng pulled up a chair and sat down in front of Gu Xiaobai. He was as happy as an old father who saw his son finally marrying a wife, and almost burst into tears.

The fans' mentality instantly exploded.

Xiaobai asked me a question!

Gu Xiaobai looked at Zhao Xingsheng seriously and asked:

"Teacher, may I ask what music... is?"

What is music?

Zhao Xingsheng did not expect that Gu Xiaobai asked such a question.

Science students who want to figure out what 2+2 equals will never start directly from 2+2. They need to figure out 1+1 first.

"It's quite difficult to explain music issues to you science students..." Zhao Xingsheng scratched his head, which was getting sparse. After all, science students like to get to the bottom of things and always want to find out why. "Fortunately, I will discuss it with your teacher.

After this question, music...it is actually a composite science, including acoustics, vibrations, physiology, and neuroscience..."

Hey, is that so? Gu Xiaobai, who originally had a contemptuous attitude towards music and thought it was simply metaphysics, his eyes lit up and he sat upright.

"If you want to understand music, you must first understand sound. Sound is a sound wave that can be perceived by human hearing over a period of time. Have you seen an oscilloscope? Usually we can use a section of sound wave waveform to represent a sound."

"Music is the distribution of countless sounds in time and space. In space, it is the pitch of the sound and the size of the sound field; in space, it is the continuation of time... Therefore, music can only be produced in a multi-dimensional space.

Something that is born.”

"If you want to understand music, you need to understand four concepts: pitch, length, intensity and timbre."

"For you science students, pitch, sound length, and sound intensity are all easy to understand. Pitch is the frequency of sound vibration, sound length is the duration of sound, sound intensity is the amplitude of sound, and timbre... you know the difference

Why does the sound have a timbre?"

Gu Xiaobai really didn't know. He had never understood anything about music.

"A vibrating object vibrates with its own fixed frequency, which is its fundamental wave, but while vibrating, its one-half, one-third, one-quarter, one-fifth, and one-sixth

The places everywhere are also vibrating at the same time, emitting harmonics of different frequencies that are twice, three times, four times, five times, six times...in terms of sound. In terms of sound, we will call harmonics overtones, all overtones.

When superimposed with the fundamental tone, the ratio of overtones of different frequencies determines the timbre of a sound. For example, Xiaobai, your treble has many and loud overtones, so when you sing the same treble, it sounds extra high-pitched.

Explode!”

Gu Xiaobai understood.

"Only after understanding these four concepts can I explain to you what music is." Zhao Xingsheng turned around, took out an iPad Pro from his backpack, opened a software called GarageBand, and called up the piano

The interface turned to the position of c3, clicked on it, and said to Xiaobai: "Music, or rhythm, is created based on frequency and human perception of frequency. This is c3, which is the legendary middle c.

It is our most commonly used do. GarageBand software expands the musical range downwards. Generally speaking, the middle c we are talking about will be marked as c4. In addition, there are small and large character groupings. This is more complicated and is all history.

There is still a problem...but no matter how you spell it, remember, this sound is middle c."

Zhao Xingsheng clicked the center c a few times.

Gu Xiaobai nodded and remembered.

"According to international standards, the frequency of middle c is 262, and the base tone of the piano is a4 above middle c, and its frequency is 440."

"Here's the key point... the frequency of a5, which is an octave higher than it, is 880, and the frequency of a3, which is an octave lower than it, is 220..." Zhao Xingsheng said, "Xiaobai, let me ask you, why is the high-pitched do, for example

How is it that c5 and bass do, such as c3, sound so similar? Sometimes when we sing, if the key is too high or too low, we can replace it with a higher or lower octave, and it won't go against the tune at all...

Why is this?"

Gu Xiaobai's eyes lit up: "Because the frequency between the high-pitched do and the low-pitched do is a multiple, it can completely overlap with the overtones of the low-pitched do!"

"That's right!" Zhao Xingsheng clapped his hands.

Gu Xiaobai laughed out loud: "It turns out that music is completely a mathematical problem!"

Gu Xiaobai understood.
Chapter completed!