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When the car was about to enter Beijing, Xiao Lei's phone rang, and he answered the phone without saying a word, and told us that the technical department had extracted some information from the tape in the trash can of Lao Zhang's house, and asked us to rush back to the bureau.

Team Cao stepped on the accelerator hard, and we rushed back to the bureau before noon. The technical office is not located in an office building, but in a row of two-story buildings across the courtyard.

The police officer who helped us with the tape was surnamed Liang, and he looked a few years older than Xiao Lei. He saluted Cao and led us to the end of the hallway, a windowless, enclosed room. The room was completely encased in a soundproof cotton-like material, lined up on one side against the wall, and housed three or four computers and some machines that I can't name.

Xiao Liang opened the equipment in front of him, started the computer, and said to Team Cao while pouring the tape back: "Team Cao, the tape I brought back was too badly damaged, not only was it burned, but it was also blistered, and more than half of it couldn't get anything, and it was probably less than seven minutes in total, and it was not very coherent, I re-copied a plate, I don't know if it helped." Team Cao nodded, patted him on the shoulder as a sign of encouragement, and we sat down in front of the machines.

Trabeculars flipped the switch, and a slight rustle came from the speakers hanging on either side of the room. This room is supposed to be the place where the technical department is dealing with audio evidence, and the soundproofing is very good, and when I sat down, I realized that when we stopped talking, the room was a little scary. The rotation of the motor in the tape recorder is usually not noticed at all, but at this moment a faint "click" sound can be clearly heard.

And this sound seems to amplify people's hearing, and then the sound of the tape rolling, the sound of Xiao Lei's ballpoint pen scratching the notebook paper, and even the sound of the watch hand beating on his wrist began to become clear. Only the rustling sound coming from the speaker is slowly getting quieter, like a person walking farther and farther away with slippers.

At this moment, a slow, deep voice rang out, "March 2nd, 96a948327", which sounded like a half-asleep whisper, and like a difficult monologue of a patient with a severe cold, and it sounded so laborious that I almost had to react for a few seconds to understand what it meant.

Xiao Liang explained to us in a low voice, "The tape was really bad, and what we hear now should be very different from the real voice at that time." Team Cao nodded, but his eyes were fixed on the roof and slowly closed, as if he was carefully distinguishing something.

For the next minute, the voice was staccato and mixed with a sharp tearing sound, but the voice kept saying different numbers, nothing else, but strangely, I don't know if it was a problem of distortion or the too quiet environment here, I always felt that there was something wrong with the sound of reading the numbers, but I couldn't think of it for a while.

"Team Cao, it seems to be a radio frequency band?" Xiao Lei next to him whispered in his notebook. Team Cao didn't answer, didn't even open his eyes, just patted Xiao Lei's notebook lightly with his hand, probably signaling Xiao Lei not to speak first.

There was silence in the tape for more than ten seconds, and the voice sounded again: "March 3rd,,82a945915......" lasted for about a minute, and it was a new paragraph: "March 4th,,75a863446......" But after the end of this segment, there was silence for a moment, and a burst of laughter suddenly came from the speaker.

The laughter suddenly appeared, chilling, desolate, cold, gloomy and pathetic. When I first heard it, I couldn't believe it was made by a human being, until the voice spat out a few words again: "The sky has appeared, record the new frequency band,." ”

After that, two more numbers, and all the transcribed sounds are over.

To this day, I can't describe the strange feeling that the laughter brought us, I seem to hear a sense of relief and a little helplessness in the voice, especially his elongated tail note, which seems to be thinking about something while recording.

It seems that our previous inference is at least one point correct, Lao Zhang and Xiang Yuanlin are studying the heavenly machine in the hut, but we really can't figure out what those numbers represent and where they come from.

"Xiao Liang, did you copy the tape when it was converted into a digital version? Team Cao was the first to react from the silence and asked Xiao Liang.

Xiao Liang nodded, pulled Team Cao to sit in front of the computer, handed him a headset, and began typing on the keyboard. Team Cao listened very carefully, and kept making comparisons on the screen, as if looking for something, Xiao Liang stroked on a piece of software that I had never seen before, and replayed it to Team Cao.

I turned my head to look at Xiao Lei, who was immersed in drawing a large page of dense tables in his notebook, and filled in the numbers he had just recorded one by one, as if he was studying the rules of the arrangement of these numbers.

A few minutes later, Team Cao sat back next to us, cleared his throat, took out a cigarette, handed one of them to him, and said, "Let's all talk about what you think of the recording just now, the amount of information in it is not small." ”

"In terms of time, this is obviously the recording before Lao Zhang's accident, and I checked the first number after that, and the first number on Lao Zhang's notebook is the same, so it must represent the frequency band. Then the numbers that follow should be the data recorded from this frequency band, but these data seem to be irregular, and I don't understand what the meaning is. Lao Zhang said that the sky has appeared, then, the numbers after that are the point, I'm afraid we have to find a few cryptographic experts to try, but without the key, the possibility of cracking is very small. After Xiao Lei finished talking about this, he was still studying in the grid on his notebook.

At this time, I realized something from the laughter just now, at least to explain the abnormality in the tone of Lao Zhang Nian's numbers. "As soon as I heard Lao Zhang read those numbers, I felt a little problematic, have you noticed, when we usually read numbers, the tone should be relatively flat, because numbers are numbers, and there will be no emotional color. And Lao Zhang Nian numbers, almost every number has a tone and frustration, which is why we always feel that this recording is very weird. ”

"Reading numbers is a bit emotional, what does that mean?" Team Cao obviously didn't understand what I meant.

It means that Lao Zhang knows what these numbers represent, in Lao Zhang's eyes, this should not be a number, but a text with clear meaning, so these numbers are not meaninglessly combined, and the key must be in the books that Lao Zhang has marked. Even our previous views on numerology books are one-sided, and many books may not be prophecies, but a key book, but unfortunately we lost the numerical password in front of it. ”

My words got everyone in thought, but they didn't seem to do much to solve the mystery before us, and Cao quickly began to talk about his discovery.

"When I was listening to the recording, my attention was not entirely on Lao Zhang's voice, occupational disease, I always felt that behind Lao Zhang's voice, there were some very strange sounds, I just asked Xiao Liang to re-do the digital version, remove the audio track of Lao Zhang's speech, you listen to it again. Team Cao said, opened the file on the computer, unplugged the headphones, and the sound of rustling electricity pulses came from the speaker.

The sound of this current pulse should be the signal received by the set of radios recorded by Lao Zhang when he was recording, at first it was a random noise, but after a while, we heard a very rhythmic pulse, like a drumstick hitting the speaker skin, and as if something was trying to get out of it.

"Is it Morse code?" asked Xiao Lei.

Team Cao shook his head, and Xiao Liang on the side continued: "It's not quite like it, it's not the same as the cipher code we know." ”

"Pay attention to the ones in the back. Team Cao tilted his head, closed his eyes, searched for something in the monotonous voice, and stopped talking.

At this time, I noticed that in the background of the recording, there was also the sound of a pen scratching on the paper, which should be Lao Zhang recording on the paper while listening to the pulse sound on the radio. But after this sound, there was an extremely slight "pop" sound, as if the sound of slippers walking across the ground and getting farther and farther away. Then, what seemed to be at the farthest end of the room, a low roar like an animal came again, a sound that seemed to be deep in the throat, purring.

"It looks like there's a cat in the house? That kind of purring is supposed to be the sound that the cat makes when it is frightened, not a normal bark. Xiao Lei also noticed the sound and stood up, his ears almost touching the side of the speaker.

"There seems to be the sound of a person walking. Xiao Liang turned up the volume of the tape recorder a little more.

Judging from the magnitude and distance of these sounds, Lao Zhang should have recorded the signal in front of the table, and the footsteps were walking from behind him in the direction of the door, and the two sounds were emitted at the same time. That is to say, there were two people in the house at that time, and the cat's position should be in the corner of the wall to the left of the door, because on the right I remember it was the bed, and when the person approached, he made a purring sound. Team Cao still closed his eyes, carefully discerning something.

"But when we went to Courtyard No. 89, Grandma Cai said that a week before Lao Zhang's accident, Zhao Shaocheng of Westinghouse had never lived in the courtyard, and Old Man Cai had a nervous breakdown, and he wouldn't know that someone was in the yard. Xiao Lei asked puzzled.

(For the sake of attaining nothing, the bodhisattva is free from all the troubles of perverted dreams, and the bodhisattva is free from all the troubles of upside-down dreams, and finally attains nirvana.) The Buddhas of the three worlds, according to Prajnaparamita, attained the three bodhisattvas of Anuttara and Sambodhi. Therefore, it is known that Prajnaparamita is a great mantra, a supreme mantra, a mantra of non-existence, etc., which can remove all suffering, and it is true. --Heart Sutra)

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