"Sister Sa must have something to do."

Xiao Yuan thought so, after the software was made, he began to work further, converting the analog radio waves received by the machine into digital signals and importing them into the computer.

With the software, this work is just a purely manual process, without any technical content, Xiao Yuan quickly received the binary stream converted by the digital-to-analog conversion module on the machine to the computer.

Due to the periodicity of the waveform, according to this characteristic, Xiao Yuan only needs to receive a cycle of the signal source, the process is very fast, it only took a few minutes to get it, and the next thing to do is to really test him, he has to analyze the received binary stream, trying to find useful information from it.

There are many difficulties in the analysis process, first of all, Xiao Yuan does not know whether the signal source sends an analog signal directly, or an analog signal converted by a digital signal through digital analogization, if the other party directly sends an analog signal, then his current analysis is like using the structure of an animal to analyze a plant, it becomes meaningless, and the probability of this happening is very large.

Assuming that the other party sends an analog signal converted from a digital signal, then there are also many problems, first of all, he does not know the specific parameters of the signal source to convert the digital signal into an analog signal, so if he wants to restore the analog signal of the other party to a digital signal, he must adjust the sampling parameters according to the fluctuation period of the analog signal sent by the signal source, so the sampling data can not only take one, but should take many copies, and then analyze the digital signals converted by these different sampling parameters in turn.

Suppose that Xiao Yuan obtained multiple data streams corresponding to different sampling parameters that happened to correspond to the other party's parameters, and he successfully restored the analog signal, there was another problem in front of him, that is, he didn't know anything about the other party's data encoding......

Therefore, the probability of analyzing the content of the information sent by the signal source through this method is very small, but it is extremely difficult to decipher it, Xiao Yuan is very clear about this, but this does not constitute a reason for him to give up, but makes him mentally prepared to face difficulties.

The binary stream under several different sampling parameters is arranged according to his own experience, Xiao Yuan began to analyze it at one time, the analysis process is carried out in a manual and software-assisted way, first Xiao Yuan will convert it into hexadecimal code, and then observe its original code and hexadecimal code, if the signal source uses some customary coding methods, according to experience, Xiao Yuan can roughly see some characteristics, and in the next analysis process, it is also good to be targeted, but in the end he is still disappointed, directly and some kind of coding method he is familiar with the small probability of the number of such a small probability event did not occur.

Visual inspection did not serve the purpose, so he had to use the tool to further analyze the code, and the results still disappointed him, from the analysis results, the code is meaningless, out of order, and has no meaning.

After analyzing all the sampled data streams, Xiao Yuan stood up, stretched his waist, moved his legs that were a little numb again, his stomach made a gurgling sound, and he looked at his watch, and before he knew it, it was already more than twelve o'clock at noon.

"Sister Sa has encountered something difficult to solve, why haven't you seen her show up all morning?" Tang Sa didn't come in the morning, Xiao Yuan couldn't help muttering in his heart, he wanted to make a phone call to ask, but there was no phone here, and his own phone fell in Tang Sa's bedroom and didn't bring it.

When he came to the door of the computer room and looked, Xiao Yuan found that the door of the computer room was locked from the outside, and if Tang Sa didn't open the door for him from the outside, he wouldn't be able to get out at all now.

"This is really troublesome, why did Sister Sa lock the door for me from the outside?" Xiao Yuan muttered, walked back again, and felt a little restless after sitting down, on the one hand, he was worried about Tang Sa, and on the other hand, he was worried that he had not been in contact with Xia Jiuying, and she would worry about herself.

"Find a way to contact Yingying first, don't let her worry too much." Xiao Yuan made a decision, the phone couldn't get through, but fortunately, the network here is open, as long as there is a network, it is equivalent to opening a window with the outside world.

If Xia Jiuying is not necessary, she usually rarely takes the initiative to touch the computer, so Xiao Yuan wants to get in touch with Xia Jiuying through the Internet, so she can only use roundabout tactics and pass the word to her through others, the first thing he thinks of is Jessica, because if Jessica is in school, she will soak in the innovation lab almost every day, and as long as her computer is turned on, it will always be online.

There is a public IRC channel on the server of the innovation lab, and the purpose of setting up this channel is to allow the members of the laboratory who are on a business trip to communicate and contact with other members of the laboratory, Xiao Yuan logged in to the chat room anonymously through this account, but what frustrated him was that Jessica was not online, in fact, it was not only her, the people he knew well in the chat room, Han Xiaoyu and Mark were not online.

Xiao Yuan looked at the time and felt that Jessica might have gone to dinner at this time, so he left a message for her, and then let the chat room hang up and switch to the background, and wait for Jessica to see his message online and reply to him, there will be an automatic prompt here.

Tang Sa didn't come, Xiao Yuan decided to continue to analyze the data stream he obtained, he had used a variety of tools to automatically analyze and no results, which made him decide to temporarily abandon the tool and conduct manual analysis again.

Staring at the computer to see the binary strings is a very uncomfortable thing, Xiao Yuan decided to do a stupid job, copied these binary strings from the computer, found a blank paper, Xiao Yuan copied these strings down at a time, and started a new round of analysis again, this bow more than an hour passed, and the result still made Xiao Yuan feel disappointed.

"Sister Sa didn't come, and Jessica didn't reply to my messages." Xiao Yuan raised his head and moved the chat room to the front desk, seeing that Jessica was still not online, and Tang Sa was not coming, which made him worry.

Glancing at the chat room, Xiao Yuan found that Han Xiaoyu was online, so he sent him a greeting, and after a while, Han Xiaoyu responded, Xiao Yuan offered to ask him to help him bring a letter to Xia Jiuying, saying that he had something to do in San Francisco and couldn't go back for the time being, Han Xiaoyu readily agreed, which made Xiao Yuan feel a stone in his heart.

Xiao Yuan waited for a while, and even ran to the door and patted the door a few times, but it was obviously useless for him to do this, there were two doors in this computer room, the inner door was locked from the outside, and there was no reason why the outer door was not locked, and these two doors were very thick, and the sound insulation effect was very good, not to mention that he was slapping the door inside, it was a big drum beating, and the possibility of the sound reaching the outside was almost zero.

Knocking on the door failed, Xiao Yuan returned to the computer and sat down again, in this case, he was very worried about Tang Sa, but he knew that at this time, worrying about not being able to solve any problems at all, it was better to do the things in front of him with peace of mind.

With this thought, Xiao Yuan's gaze shifted to the dense paper drawn by him in front of him again, pondering for a moment, thinking about whether he should change his way of thinking and diverge a little, maybe there will be new discoveries.

With this idea, Xiao Yuan abandoned the original conventional analysis method, tried new methods again and again, one method did not work, and then changed another, time also passed in this kind of non-stop attempt, and before I knew it, the time of the day was about to pass, and Xiao Yuan finally tasted the fruits of victory after countless failures.

It's just that when he got the fruit of victory, he was shocked by this fruit and suddenly jumped up from his seat, and became extremely manic because of extreme worry.