Pet King

Deflate the assault boat on the beach and fold it away. Zhang Zi drove back to the pet shop with satisfaction. The underwater pickups need not be returned to Professor Wei Kang in a hurry, because it is not known whether the recorded sound is complete. Although he doesn't understand whale, he knows that language is very complicated, and he can't learn it by listening to a few bytes.

If Shihua says that the length of the recorded voice is not long enough, he will continue to repeat what he did today until she is satisfied.

"Master, you are back, Godzilla ... wrong, did you record the sound you want to record?" Wang Gan ran over, picked up the battery, and asked inexplicable words in his mouth.

"Well, maybe it was recorded. I will make a copy after editing, and give it to Li Kun, and let him play it in the aquarium as a background music loop." Zhang Zi'an instructed, while carrying a full set of underwater Pick up the sound equipment and go to the second floor.

Wang Qian agreed, and returned to the store to charge the battery.

π has just finished writing a chapter and is stretching back and forth in the living room, moving his body.

"Π, I'll use the computer, it will be fine in a while."

"Squeak."

Zhang Zi'an took out the memory card in the device, installed the supporting sound spectrum analysis software in the computer, and then imported the original audio file in the memory card.

The sound is converted into a waveform chart and output on the screen, but it is very disorganized, just like the k-line chart of a thousand stocks are displayed at the same time, which is dazzling.

He researched the usage of this software, called the filter, and filtered all high-frequency sounds. The screen immediately refreshed a lot, but there were still hundreds of curves.

Then he dragged the timeline further to find the end of the audio file.

He roughly remembers when the sound of the giant whale appeared. By comparing the time when it appeared and the end, he further excluded more than 90% of the noise, and the remaining few curves.

Due to lack of experience, the remaining curves could not be simply eliminated by the sound and sound diagram. He simply used stupid methods to select these curves one by one and then played them.

Boom……

despair……

Click ...

Ding……

hiss……

Various sounds came out of the laptop's weak speaker in turn, and some of them were out of the ear's hearing, and could only be heard after being enhanced by software.

Strange to say, he was attentive at the time, but still felt strange when he heard these voices, as if he had never heard them before.

"Squeak."

π scratched his head and scratched his cheeks, as if itching all over his body. Obviously, the sound was too weird to hear it, and finally he blocked his ears, jumped into the hanging rattan chair, and covered his head with a pillow.

Woo--

The familiar voice sounded.

Zhang Zi'an's heartbeat suddenly accelerated.

Can't be wrong! That was the voice I heard! As the whistle of a train is sounding, the sound periodically strengthens and weakens, and occasionally it is mixed with a banging sound similar to a train wheel rolling over a railroad track junction.

He finally found it. He didn't dare to release it by holding down the left mouse button, for fear that the curve would be overwhelmed by other curves after releasing it, but dragging it to create a new window alone.

In the new window, this curve is shaped like a periodic peak, which is steep on one side and gentler on the other. The peak has several undulating peaks. This is the sharpest part of the whistle, and the highest point often corresponds to the sound of chirp. .

On the axis of the curve, the x-axis represents time, and the y-axis represents the frequency of the sound.

He moved his gaze and looked at the y-axis.

"Ok?"

He froze.

Only a few species of whale can grow to such a huge size. Excluding right-winged whale with keratoma and skeletal whale like sperm whale, the remaining options are few.

Zhang Zi'an originally thought that the giant whale was a blue whale or a fin whale, but the number on the y-axis indicated that he was completely wrong.

The frequency band of blue whale sounds is basically between 15 Hz and 4o Hz, mainly concentrated within 15 to 2o Hz. In recent years, as humans have created too much noise in the ocean, there is evidence that the frequency of blue whale sound is gradually lowering The shift is getting closer and closer to 15 Hz to avoid conflict with human noise.

The fin whale's sound frequency band is even narrower, between 15 and 25 Hz, mainly concentrated around 2o Hz.

The hearing range of the human ear is 2o to 20,000 hertz. Without the aid of instruments, humans basically cannot hear the sounds of blue whales and minke whales.

However, the frequency range corresponding to the y-axis on the screen is between 45 and 5o Hz, which can be directly heard by the human ear.

Strange, is there anything wrong? This curve is not the sound curve of that giant whale?

Some whales have a wide range of sound frequencies that can cover this range, but those whales do not grow so large.

The most normal and reasonable explanation for Zhang Zi's thinking was that when he recorded a giant whale, there was another whale of a different kind in the nearby sea. He thought it was the sound of a giant whale, but it was actually from another whale.

But is there such a coincidence?

If so, where did the sound curve of the giant whale go?

He switched back to the original window and played the remaining curves one by one again. The headache was that he couldn't determine whether these sounds were the sound of a whale.

It would be nice if a senior submarine sonar was here, and he would definitely be able to tell him what these sounds were.

He was a little depressed. He thought he had done his part in the battle. Now it seems that he will go to record a sound tomorrow. I hope I won't be wrong next time ...

Wait, is it really wrong?

He tried not to let go of every possibility.

What if you're not mistaken? What if the sound recorded tomorrow is still this unusual sound curve?

It's impossible to always have a mysterious and never faced whale to follow that giant whale at all times?

There is an ultimate elimination method called "Okham's Razor's Law". The simplest expression of this law is "if not necessary, don't increase the entity".

The avenue is simple, the simpler the better.

Specifically, www.wuxiaspot.com ~ When two hypotheses have exactly the same explanatory power and predictive power, we use that simpler hypothesis as the basis for discussion.

Zhang Zi'an became aware that she was now making a mistake, and in order to explain the anomaly, an entity was added out of thin air-another whale that followed the giant whale, mysterious and never showed up.

Is it really necessary to add this entity?

In fact, there is obviously another explanation that can achieve the same effect-that is the voice of the giant whale, there is no other mysterious whale.

Which of the two explanations is simpler? Obviously the latter.

The sharp Occam's razor flickered across, cutting the former into pieces. ...

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