Technicians have their own arrogance, plus Kang Wenbin is still a student, has not been baptized by the pressure of social survival, and does not understand compromise, and carefully did some research, this is the best plan he chooses to think, and said firmly: "There is no way to change the plan, this is the best plan." Pen, fun, pavilion www. biquge。 info”

Liu Chen can see it, it's okay to let this guy get started, but it's not good to lead the development at all, whether it's vision or technical strength.

Lan Jun said: "It's not good, why can't you change it?"

Kang Wenbin insisted: "This is the best plan, and it is also the plan adopted by all major well-known manufacturers, Sony, Samsung, Avery and are all this kind of plan, can it be adopted by other large manufacturers?"

Lan Jun felt that it made sense when he heard it, but he felt that something was wrong, so he could only stare at Liu Chen, buddy, say something.

Liu Chen shook his head and said: "Samsung can develop chips by itself, and it is not a problem to customize decoding chips for themselves, these big factories have standardized processes in all aspects, they run fast, and there are also a lot of reserves of chips. ”

Kang Wenbin blushed when he was said, and said unconvinced: "What kind of strange method do you want?"

"Everything is based on reality, there is only one way for a small domestic factory to enter the MP3 market and get a piece of the pie, that is, low price, if you want to gain a firm foothold, you must also ensure a certain quality. ”

Lan Jun slapped his thigh and said, "That's it, everything has to be based on reality." ”

"Do you think it's realistic to want the horses to run and not give them grass? Kang Wenbin was not convinced, he did compare multiple plans and choose the best of the best.

"You did spend a lot of time collecting basic information, for us, it is most reasonable to choose the main control chip of sigmatel integrated decoding, this chip is in sufficient supply, it can be bought everywhere, even if you apply for a trial, you can get ten pieces at once. ”

Kang Wenbin sneered and said: "sigmatel is synonymous with low-end master control, I don't need a little grade MP3, I can figure it out, this chip is the first I ruled out." ”

Liu Chen said with a smile: "It doesn't matter what chip you use, in fact, few consumers will care about what main control chip is used, what everyone is pursuing is the final effect, what the sound effect is." ”

"What sound can such a garbage chip have? It's strange that someone will buy it. ”

In fact, Kang Wenbin's idea is the idea of most manufacturers and developers now, who believe that decoding chips are the most important, and they are all competing for chips, only chips.

Then, in the previous life, there was a brand that entered, which made most people change their obsessive view that the chip completely determines the sound effect, and sealed the mouths of those chip-only people with the sigmatel chip, proving that the decoding chip is not the whole of performance.

Liu Chen has a deep memory of this event, and when he was thinking about MP3 development during this time, the first choice was sigmatel's decoding chip.

"Never jump to conclusions about things you didn't do. Liu Chen said something very Zen.

Kang Wenbin snorted and said: "Sigmatel's three chips STMP3300, 3400, and 3410 all use a 56KDSP structure, although they also integrate audio DAC and headphone power amplifier lines, and can also be compatible with a variety of audio compression formats, and even can be continuously upgraded, but there is one biggest shortcoming. ”

He deliberately made each model specific to show that he knew this knowledge in detail, which sounded very bluffing, at least Lan Jun felt that this graduate student was still very powerful, and all kinds of professional terms sounded very high-end.

After a pause, seeing that Liu Chen looked at him and didn't answer, Kang Wenbin continued: "That is, it is difficult to develop, and the MP3 decoding algorithm needs to be transplanted into the DSP chip, do you know what it means?"

Liu Chen nodded and said, "I know." ”

This made Kang Wenbin a little surprised, and said: "Theoretically, the more concise the transplanted decoding algorithm, the better, not to achieve the decoding function, heh, if you write a large number of programs to decode, just wait for the crash." ”

Of course, Liu Chen knows that in fact, the DSP porting MP3 decoding algorithm depends on the theoretical height of the algorithm.

Generally, the music on the CD has 44.1kHz16Bits stereo audio quality, how to compress these songs basically losslessly, greatly reducing the data stream, this is the audio signal processing, and then restore these digital signals into analog audio, is the role of the decoding chip.

The higher the theoretical height of digital signal processing, the simpler the decoding algorithm is written, the higher the degree of music restoration, and the algorithm will occupy less resources to run on the DSP, and if it takes too much, it will often crash.

If the algorithm implementation is too poor, then the sound quality is too bad, in fact, if you want to use sigmatel's chip to achieve high sound quality, the main thing is to improve the decoding algorithm.

The difficulty of all this lies in the decoding algorithm.

And Liu Chen's best thing is signal processing algorithms, so he firmly chooses the sigmatel chip.

It's hard for other people, even a professor in the mathematics department, it takes a lot of time, and it doesn't necessarily work, maybe he can implement the function, but it's not concise enough.

Functionality and simplicity are indispensable.

Kang Wenbin snorted: "Since you know, then if you choose this chip, either the sound quality is too bad, or it is dead, there is no second way, and a fool will not buy such a product." ”

"It's also possible that the sound quality is great and it doesn't crash, and since there is a possibility, it's worth it. ”

"Then you'll have to do it for the rest of your life. Kang Wenbin was a little sarcastic, he felt that the guy in front of him was too ashamed, he was the best graduate student in the Department of Electronics, and his hardware level and theory were the strongest, he couldn't do it, you are the oldest, and the hair has not grown.

Lan Jun believed Liu Chen a little blindly, and said in surprise: "What are you talking about, can you get it, how long will it take?"

Liu Chen stretched out three fingers and shook them.

Kang Wenbin exclaimed: "Three years? Let's talk big, so many scientific researchers in the first-line factories don't try, so they know it's not easy." ”

It's not that big manufacturers can't do it, but they didn't think to do it, and they all thought about choosing the latest decoding chips, but didn't think about tapping the potential of low-end chips.

Lan Jun smashed his mouth and said, "Brother, these three years are too long, and the cucumber dishes will be cold by then." ”

Liu Chen smiled and shook his head, "It's not three years. ”

Kang Wenbin said: "It's not three years, it's hard for you to still want to do it for thirty years, I'm afraid MP3 won't exist at that time." ”

The associative power is really rich enough.

Lan Jun smiled excitedly: "Haha, it can be done in three months, right? ”

Liu Chen said with a smile: "It's not thirty years, it's not three months, when it's okay in the past few months, I just have some research on this aspect, if the conditions are right, about three days is enough." ”

Three days?!

Kang Wenbin screamed out, and the other two undergraduate elementary school brothers also grew up with their mouths, three days is not enough to collect data, what about the datasheet of the chip, it is not easy to design a stable peripheral circuit.

In his previous life, Liu Chen's execution of the team was not strong, and because he had no money, the development of the entire entrepreneurial project was completed by himself, so he was extremely rare to have a super high theory, knew how to program, and was also very good at low-level hardware development.

Lan Jun laughed, patted Liu Chen's shoulder hard, and praised: "I knew you could do it, there was nothing you wouldn't know, I knew it was right to look for you." ”

Liu Chen glanced at him, this afterthought was really loud.

……

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