"But there's something wrong with it besides these kids......" said Reiko Akiwa as she turned her head and looked in the direction of Moriran.

"Hey, I'm ...... Did I make a mistake? Maolilan was taken aback. No...... No way? ”

"Don't worry, you're playing right, the problem is the piano." Reiko Akiwa shook her head. "You just play a la out and take a look."

"Hmm......" Maolilan nodded tentatively.

"Well, this piano has obviously not been maintained for a long time." Reiko Akiwa nodded. "Although it can barely be maintained near the original vocal range without causing discomfort to the listener, it is clearly not being maintained as it should be, and some of the pitches are dropping."

"Really?" Maoliran looked at the piano in amazement. "I ...... Well, maybe I'm not very good at the piano and can't hear it at all. ”

"You ......" Reiko Qiu Ting suggested after thinking for a moment. You press liter la to see. ”

When Mao Lilan moved her finger to the right and pressed the black LA button on the right side of LA, she immediately showed a somewhat subtle expression, and Wai and Ayumi were equally subtle. "Really, it seems to be a little lower, and it doesn't seem to have opened up the gap with the LA key? Well...... Overall, I don't think the problem with LA is obvious at least, but this LA is lower than I've heard before. ”

Qianyu is well aware of the error of the piano, and at this time he is just a little surprised that the error of this tone is so large: the frequency of the la note just now is 439Hz, and the la is generally adjusted to between 440Hz-445Hz, which is relatively within a more tolerable range. In contrast, this liter LA is much more problematic. The standard frequency should be 475Hz-480Hz, but the frequency of this liter is only 460Hz. In other words, the frequency of the upscaling should normally be 35Hz higher than the la, but now it is only 21Hz higher, so that the contrast to the adjacent keys makes it obvious that even the untrained person can feel that the upscaling is not high enough.

"After adjusting with the law of twelve, it has fallen into disrepair again, right?" Gray Yuan hesitated to put forward his opinion. "If I remember correctly, if you tuned it with the twelve equal temperament, the four keys of do, re, so and la would be unusually low. This, combined with the overall tonal sink caused by poor maintenance, makes these notes unusually harsh to the ears of people with relative or absolute tonality. ”

"That's right," Reiko Akiba agreed with the opinion raised by Gray Hara. "The twelve equal temperament is easier to show timidity at this time, but it is not so hopeless when generally playing, and this thing is because of the uniform difference in scale, so it does have its convenient advantage when transposing, so it is more popular. However, if you want to pursue precision, you must use a more extravagant method to tune the sound. ”

"What is the Law of Twelve?" Ayumi asked Ashbara a little nervously.

"There is a relationship between the frequencies before each scale of the piano, and generally speaking, the pitch frequency of the sound produced by each key and the 12th key backwards is exactly 1:2. In the beginning, people set the sound frequency between adjacent keys according to some specific ratios, such as 120:128:135:144:150:160 (do to fa), but although this frequency design is very good, it encounters the problem of transposition difficulty in the practical application of modern society because of the uneven pitch change of each key. Thus the law of twelve equals was born - each bond is a specific multiple of the frequency of the previous key, and the 13th bond is exactly twice the frequency of the 12th key, so that the frequency difference between all adjacent keys is uniform and can be adjusted up and down freely. But at the same time, it also makes the pitch of the twelve equal temperaments different from the perfect combination of the original pure temperaments, with some notes being higher and others being low. Among them, la is generally used as the reference origin of 440Hz, and this happens to be the node with the higher average law in the 12 mean law. So if the initial LA is not adjusted to a higher position, then a poorly maintained piano will easily defect in the keys with the lower 12 equal pitches. ”

"So, what is absolute and relative pitch?" Mitsuhiko also raised his own question, but he was handed over to Chiba in the eyes of Gray Hara's mourning because he had just said a long paragraph and was too lazy to perfunctory the boys.

"Let me give you an example, in music, if we quantify the pitch as frequency, then the person with absolute pitch will know that the tone is about 430-450 when they hear LA, which should belong to the LA area. And the words of the owner of the relative tone...... There's no way they can tell if it's a la after hearing it, but if you play him another do, then he can tell you how much higher the note you played before than that. ”

[To put it simply, relative pitch requires a benchmark pitch to compare with the sound heard in order to judge the pitch heard.] Absolute pitch does not need a reference pitch, and you can use your brain to make up a baseline pitch and directly judge the pitch you hear. As for the thousand feathers...... His auxiliary unit is an enhanced version of the absolute pitch, which is completely quantified into specific frequencies, and does not need to make up the base pitch like the usual absolute pitch, but can directly see how high the sound is. 】

"Hmm-" Reiko Akiwa walked over to the piano and pressed a row of keys at the same time. "It does seem like it's something that comes out of the twelve equal laws...... Oh yes, rigid boy, can you help me get the thermos out of my bag and pour some water? and the throat lozenge in the pocket where the thermos pot was placed, and brought it together. ”

"Hmm, okay." In response, Chiba walked out of the group very obediently and walked towards Reiko Akiwa's backpack.

"Are you going to use this piano for the competition?" Reiko Akiwa turned to the children who were still in the team and said.

"Probably not," Maolilan replied. "It should be the piano in the auditorium."

"Another piano?" After thinking for a moment, Reiko Akiwa said. "Ayumi, when you sing when the time comes, just raise the pitch a little bit, you don't need too much, can you do it?"

Before Ayumi could respond, they heard Chiha's inquiry.

"Miss Reticle, may I ask...... Has anyone touched your kettle? ”

……

Rangyumi raised the pitch slightly in order to make her voice more pronounced and at the same time make the sound quality better. Just as when a symphony orchestra plays with a 440Hz pitch, a soloist tends to use 442 as a benchmark alone. And some bands even use 445Hz as a performance benchmark to improve the sound quality of the band.