The performance test of MP3 is mainly to simulate the digital signal of a piece of music after being processed by the main control chip, and then compare it with the original signal, but not to listen to the sound quality with your ears, but several stages of high, medium, bass and aliasing, with an oscilloscope. Pen, fun, and www.biquge.info

The MP3 sound quality performance of the Sigmatel decoder chip is decent, the sound is relatively bright, the midrange performance is average, the low volume is insufficient, and the treble is relatively stiff.

After the test was completed, Kang Wenbin jumped up and shouted: "Brother Chen, you are really a god, now the reproduction of high and high bass and aliasing is very good, which is comparable to Philips's chip." ”

Liu Chen breathed a sigh of relief, he had been working continuously for almost 24 hours, and he completed the first version of the algorithm in a very short time, but the sound quality performance was still not satisfactory, especially when the key range of a song was relatively wide.

Although it doesn't sound obvious to ordinary people, but now many people who buy MP3 are music enthusiasts, if they can't be a hit, and there is no difference between those poor quality public model products, it will be wiped out, and you can't make money, I'm afraid that more than 300,000 will have to lose everything, this cannon, there is no room for loss.

Lan Jun looked at the happy expressions of the three of them, and couldn't understand what the waveform on the oscilloscope meant, so he followed silly, "Hehe, Liu Chen, you are really good." ”

"Stop talking nonsense, why did you come back so soon, how did things go?"

Lan Jun took out a few packages from his bag, and said with a stinky fart: "The flash memory and the main control order are 10,000, and the shell of the male model is also done, how about you take a look?"

"10,000, that's a lot!" Liu Chen was a little startled, according to his estimates, it would be quite good to sell 20,000 units in the whole summer, after all, the shipments in Feicheng were relatively small.

He is also ready to improve the appearance after the first batch of shipments.

Lan Jun has a good relationship with many people in Feicheng Electronic City, and he directly distributes goods here, radiating downward, and the first batch of 2,000 units is probably not a big problem.

You have to eat the rice one bite at a time, and you can't become a fat man all at once.

"Didn't you tell me to get as many goods as I could? ”

Liu Chen didn't blame him, he looked at the shell, this is a very typical shape, except for the logo, it can be said that it is featureless, no way, in order to rush to the market, it has to be like this, one end is in accordance with the requirements, directly use the USB interface, which can be used directly as a USB disk.

It's just a little uneasy, this step is too big, in case the sales are not ideal, the consequences are unimaginable, the money is not earned, and then you owe a high amount of foreign debt, but you want to cry without tears.

Liu Chen's uneasiness can only be transformed into a paranoid demand for product quality.

"The Sigmatel main control chip almost concentrates all the hardware functions, as long as it is connected to an external FLASH memory and some simple resistor-capacitance components, this is a complete MP3 player, despite this, the PCB design can not be a little flawed. ”

The importance of the main control chip to MP3 is equivalent to the engine for a car, without a good engine, you can't build a luxury car.

But having a good engine doesn't necessarily mean you can build a luxury car.

For MP3, the PCB design of the circuit, the soldering process, the circuit board material and the selection of components are all critical.

The two brothers of the Kang family almost collapsed.

Liu Chen continued: "It's too late, we've made a lot of progress, now go back to sleep, after resting, come back and work hard, and assemble the first official MP3 today." ”

Lan Jun's enthusiasm was ignited, and he said: "Why don't we do it directly, I'm very excited when I think about it, and I can't sleep at all." ”

Of course, he was also hit by a woman and couldn't sleep, and he was in high spirits at this moment.

Liu Chen said, "Developing algorithms requires inspiration, and it is likely to take more time to interrupt, so I ask you to keep insisting on PCB optimization, which requires experience and many experiments, don't work so hard, go back and rest first." ”

Several of them went back to sleep.

……

Gong Hui has been taking a bath since she got home.

She washed it over and over again, and then slowly calmed down, and the wine was completely sober, although her head still hurt a little, and the frustration in her career calmed down.

A sense of courage is filled in her heart, Nuoda is a Huaxia, can't she find a product with good quality and moderate price? Aiguo Company has only risen for two years, really speaking, it is the moonlight series launched this year that has made it a domestic first-line brand.

She is stubborn and refuses to admit defeat, she thinks of it, and quickly finds more than 20 companies that are developing MP3 through some friends, and prepares to inspect one by one, maybe she can find the right product, as long as it meets the quality and price of these two aspects, she has the confidence to push it thoroughly.

What about Sony, which started out as a small and inconspicuous company.

She put on professional clothes, set off with a suitcase, and just went out of the house and received a text message from Yang Kai, "I asked you to lead the negotiation with Tanaka, and now Zhang Jia has reached a cooperation intention with him, this world only looks at the results and does not look at the process, you let me down." ”

Gong Hui glanced at it and turned off her mobile phone directly, she now has no distractions, and stubbornly insisted, as long as she finds a good product to reverse the situation, will Soni definitely be able to sell well?

Seven companies ran in one day, distributed in East China, the first one is near the middle ring of Jianghai, several students who claim to be Jianghai University started a business, Gong Hui looked at their data and surreal design, and can only say that the idea is good, but this product is probably on the market for a long time, and the price is outrageously high.

When she proposed the price, one of the young men stiffened his neck and retorted: "This MP3 is the one we have spent a lot of effort to develop, and it will prove our reputation in China, defeat the Korean and Japanese systems, and enter the American market." ”

Gong Hui sighed and left, listening to the blood boiling, but it was unrealistic.

The second company, which is also in Jianghai, spent more than 200 yuan on a taxi fare, and then walked two kilometers to find this company, which is in a warehouse area, this group of people is very polite to her, warm hospitality, Gong Hui was disappointed when she saw the product.

Typical shoddy public model products, this kind of small workshop in Shencheng, there are not a hundred but eighty, and more importantly, the price of this product is not pressed to a very low level, no competitiveness, can only be laughed at generously.

The third is in Sioux City, the fourth is in Kuncheng, and the fourth or five are in Cangcheng.

……

She ran around all day and returned to Jianghai, feeling very tired, only endless disappointment, she didn't want to stay for a moment, she only ran to the airport to go back to Shencheng.

She stood at the airport and looked at the vast night outside, thinking complicatedly, am I wrong? Although these small factories use the same main control chip and the same FLASH as the big factories, regardless of the roughness of the shell, even the quality is rotten, this cannot be called a product at all, it can only be a model that realizes the function.

She was deeply disappointed, even desperate, not only for Huaxia's products, but also for her precarious career, no wonder Tanaka dared to speak out so loudly.

No matter how rampant he is, the quality of Soni's products is obvious to all.

Hey, she sighed deeply, helpless.