don't call me singer

Chapter 10 What is Music (new book for support)
In the elevator, Zhao Xingsheng had a dark face, and his three graduate students were all snickering while covering their mouths.

After all, on the way here, Zhao Xingsheng had already boasted to them that Gu Xiaobai burst into high notes, as if he was the number one fan.

But when we really met, Gu Xiaobai didn't even remember his face.

You say irritating is not irritating.

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

In such a small space, Zhao Xingsheng realized that Gu Xiaobai is really tall. Zhao Xingsheng is close to 1.8 meters tall, which is considered tall for his age, and Gu Xiaobai is half a head taller than him.

Although he was still tall and thin like a teenager, he looked a little thin, but it also made Zhao Xingsheng sigh with emotion, the nutrition of children nowadays is really good.

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

"Add your face to the important person's face and write it down." Gu Xiaobai said, still murmuring in his mouth: "Professor Zhao, Zhao Xingsheng, crayfish, old meerkat..."

"What did you say?" When Zhao Xingsheng heard his name, the latter two were a little puzzled, and always felt uncomfortable.

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

Zhao Xingsheng was a little hurt again. I am so mediocre, I still need associative memory to remember.

It hurts.

Familiarly opening the door of the laboratory, Gu Xiaobai began to prepare consumables for Zhao Xingsheng, fill in the form, turn on the equipment... Obviously he has been here many times.

Zhao Xingsheng also nodded with emotion.

The competition in the campus [-] students program is very fierce. Not only the students are competing for this place, but the teachers are also competing for the candidates for the campus [-] students.

Especially for young professors like them, it is not easy to gain a firm foothold in the school. If you want to grab resources, you will definitely not be able to grab other big cows. resources, let the school tilt the capital of resources.

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

"If I can't make it to the finals next year, I'll be eating guitar live in front of the principal!" said Lao Wang, the guitarist of Professor Zhao's band.

Such an outstanding student, wherever he goes, the teachers are willing to give him the green light.Ordinary students often have to get in-depth contact with young doctoral and master supervisors in their senior year, and now they have begun to guide Gu Xiaobai carefully.

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

"Okay, waiting for the result."

"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 so relieved that he almost burst into tears when he saw that his son finally got a wife.

Fans' mentality was instantly bursting.

Xiaobai asked me a question!
Gu Xiaobai looked at Zhao Xingsheng seriously and asked:

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

What is music?
Zhao Xingsheng did not expect Gu Xiaobai to ask such a question.

理科生们，想要弄明白2+2等于几，从来不会直接从2+2开始问，他要先弄明白1+1。

"It's more difficult to explain music to your science students..." Zhao Xingsheng scratched at his increasingly sparse head, after all, science students like to get to the bottom of things, and they always have to figure out why, "Fortunately, I will discuss with your teacher. After this problem, music... it is actually a complex science, including acoustics, vibration, physiology, neuroscience..."

Huh, is that so?Gu Xiaobai, who originally had a contempt for music and thought it was metaphysical at all, his eyes lit up and he sat up straight.

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

"And music is the distribution of countless sounds in time and space. In terms of space, it is the level of the sound and the size of the sound field; in terms of space, it is the continuation of time... Therefore, music can only be achieved in multi-dimensional space. something that was born."

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

"For you science students, pitch, length, and intensity are easy to understand. Pitch is the frequency of the vibration of the sound, the length is the duration of the sound, the intensity is the amplitude of the sound, and the timbre... You know the difference sound, why does it have timbre?"

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

"A vibrating object vibrates at its own fixed frequency, which is its fundamental wave, but at the same time as it vibrates, its half, one-third, one-quarter, one-fifth, and one-sixth At the same time, they are also vibrating at the same time, and the frequency is twice, three times, four times, five times, six times... Harmonics of different frequencies. In sound, we will call harmonics as overtones, all overtones Superimposed with the fundamental tone, the ratio of overtones of different frequencies determines the timbre of a sound. For example, Xiaobai’s treble, the treble overtones are very many and loud, so the same treble, when you sing it, it sounds extraordinarily high-pitched. Explode!"

Gu Xiaobai understood.

"After understanding these four concepts, I can 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 On the interface, I turned to C3, clicked 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 central C. , it is the do we use most. GarageBand is a software that expands the sound range downward. Generally speaking, the central C we are talking about will be marked as C4. There are problems left over from history...but no matter how you mark it, remember, this sound is the central C."

Zhao Xingsheng clicked the center a few times.
Gu Xiaobai nodded and remembered.

"According to the international standard, the frequency of central C is 262, and the reference tone of the piano is A4 above the central C, and its frequency is 440."

"Here comes the point... A5, which is an octave higher than it, has a frequency of 880, and A3, which is an octave lower than it, is 220..." Zhao Xingsheng said, "Xiao Bai, let me ask you, why the high-pitched do, such as Say C5 and bass do, such as C3, are so similar in hearing? We sometimes sing, if the tuning is too high or too low, we use a higher or lower octave instead, which does not violate the harmony 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 coincide with the overtone of the low-pitched do!"

"That's right!" Zhao Xingsheng slapped him.

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

Gu Xiaobai understood.

　For iOS systems, you can open the GarageBand piano interface, click C3, GarageBand's C3 is the center C, and then try C4, C5, and C6 to know the pitch of these notes.

　　
　
(End of this chapter)