Tang Jiayi took her son to their temporary room to breastfeed, the baby in Ma Jing's arms was replaced by the eldest daughter Xiao Zhizhi who had just woken up, the girl had just slept and was staring at the computer screen in front of her with great interest, she may be thinking in her heart: The candy-colored beads look so delicious, I really want to lick it to see if it is sweet!

These are the design of the Zhizhu bracelet to be determined, the development difficulty of this modular bracelet is actually simpler than the modular mobile phone, the latter must do everything possible to be thin enough, but also have enough strength, can not fall apart, and the bracelet is made of heavy If the impact is relatively small, after all, as an ornament, the bracelets that appear on people's wrists are not all slender and lightweight, and there is no shortage of nail skin bracers, thick iron chains, and other rough things.

However, in this way, the design of Zhizhu is more difficult, and they must be packaged with the kind of shell that best sells the most popular, otherwise these little things will definitely not be popular.

This is also the reason why Atletico Madrid chose to put Zhizhu on the crowdfunding platform when they have already been developed, and Bee naturally has no shortage of funds for this project, and they really want to be the participation of actual users, so as to help them design the best product appearance.

What Atletico Madrid is looking at is the special page on the Zhizhu Bee crowdfunding, and at present, the "Colorful Candy Broad Bean" program has received the most support.

As a number of e-commerce giants have set foot in the field of crowdfunding, Bee has also launched a consumer-oriented bee crowdfunding platform, but just like the e-commerce crowdfunding platform actually plays pre-heating pre-sale, and the social crowdfunding platform plays "crowd-begging", the crowdfunding platform of Bee is also very distinctive.

First of all, most of the projects that have landed here are from Bee and its affiliates, including new products from Bee's internal creative crowdfunding, as well as new projects from other partner companies or simply employee startups.

Secondly, although Bee Crowdfunding also accepts third-party projects, it is very strict about the qualifications and strength of third-party projects. But at the same time, they have played a new trick here, and made a "crowdfunding outsourcing", the project sponsor can outsource the project to other teams due to his own lack of strength, and the "pick-up heroes" are either Bee's own studio, or the senior team of CTA Zhonglin Association, speaking of which is still Bee's own family.

In this way, it is said to be "crowdfunding", and the bee platform is more like a C2B customized platform, but it is just turning the initiation of orders into the initiation of crowdfunding. Although some netizens scolded him for selling dog meat on the head of a sheep, which seriously deviated from the neutrality of the platform, the fact that crowdfunding products with a strong bee background have been successful one after another shows that it is appropriate and wise for bees to do so.

It's just that the "non-mainstream" crowdfunding such as bee crowdfunding and e-commerce crowdfunding has hurt those platforms and teams that are doing crowdfunding, because they have raised users' expectations for results. Whether it is "a smart rice bowl that can remind you not to eat too much" or "a translation software that can turn Wangwang into human words", as long as you can clearly write out the project requirements, and then pass the review of Bee and pull enough crowdfunding amount, you only need to wait, and Bee's strong software and hardware development capabilities ensure on-time delivery.

The Zhizhu project has two hot labels of "modular" and "wearable" at the same time, so it is natural that it has been successfully crowdfunded early and entered the development stage, and now it is only necessary to determine the shell design and final commissioning.

Thinking of this, Atletico looked down at his daughter in his arms, hugged her and shook her: "Haha, daughter, it's time for you to earn milk powder money for yourself again!"

It can be said that Xiao Zhizhi, who was born with a golden spoon, naturally does not need to worry about milk powder money, and her "work" is completely imposed on her by an unscrupulous father.

Atletico brought a pair of special headphones to her head, and then held his daughter's forehead against her scalp and felt her brainwave signal change.

According to the textbook, the frequency range of sound that can be heard by the human ear is 20 to 20,000 Hz, so the sound below 20 Hz is called infrasound, and the sound above 20,000 Hz is called ultrasound, but usually after the age of 20, the ear's perception sensitivity to high-frequency sound is declining, and the spectrum of "ultrasound" is actually expanding.

Interestingly, the infant period is the time when the human ear is most sensitive, and it responds to both very high and low sounds, but this "ability" disappears as we get older and enter childhood. Researchers speculate that the sounds of these two people may have "polluted" the baby's fragile hearing organs, making it "dull".

Atletico Madrid's "job" for her daughter is to listen to some high-frequency sound signals, and if she can't hear these sounds, then other babies will also be unable to hear them, and teenagers and adults will not be able to hear them.

Of course, Atletico Madrid have already found this dividing line, and he is now repeating the movement of the dividing line in case there is something unexpected in the final product.

Taking advantage of the different sensitivities of different groups of people to sound, some very interesting things can be developed, it is better to develop "minors driving away noise", which contains a large number of high-frequency sounds that can cause "noise attacks" to teenagers, making them feel irritable and consciously stay away from places that are not suitable for children, while adults who cannot hear UHF are not affected. There are also foreign students who use this principle to make "teenager exclusive ringtones", which can effectively avoid the sound of the mobile phone during class to attract the angry eyes of the teacher, if the teacher, Mr. and Mrs. are old enough.

Atletico applied a similar principle to the Zhizhu bracelet, discovering the "idle" high-frequency areas of the phone's sound system and using them for information communication.

For the human vocal belt, the frequency range of the sound it produces must of course be within the receiving range of the human ear, otherwise it will be meaningless. Usually the human ear is most sensitive to sounds from 1001 to 4001 Hz, and can be distinguished even at very low volumes, while the ability to distinguish bass and treble is much worse, and the frequency of daily conversations is precisely between 501 and 3001 Hz, and the listening and speaking of language are quite well matched.

For electronic products, their working frequency bands should naturally be designed differently according to different uses, and products such as telephones, radio, television, and ordinary tape recorders should naturally cover this range as much as possible. For example, in the field of analog communication, the operating frequency is between 300 and 3400 Hz, which ensures that the sound of people speaking can be clearly captured and reproduced. Although the current mobile phones are already 2G3G and even 4G digital phones, but the working frequency band of the voice coding technology AMR used is still no different from before, the operator said that the working frequency band will not be expanded until the application of the next generation of VoLTE technology, bringing users a better and more natural call experience, at that time, the voice call signal is completely transmitted through the 4G network, which is similar to everyone listening to songs online (of course, the connection stability and reliability requirements are higher), which can naturally improve the call bit rate and sound quality.

Because of the rise of MP3 ringtones and mobile phone video, the working range of mobile phone audio systems has already broken through this range. The MP3 sampling rate is generally 44100 Hz to reach CD sound quality, and theoretically the sound can be collected up to 22000 Hz, which has entered the ultrasonic area.

For an adult's eardrum, it is in fact likely to be unable to distinguish a treble above 15,000 Hz, let alone an ultrasound of 22,000, but his body can.

No matter what frequency of sound waves, it is first and foremost a mechanical wave generated by vibration, which contains energy, and the sound in the air acts not only on the eardrum, but also on the muscles and bones of the human body. Because the human ear is not sensitive to low-frequency sound, the sound that sounds as loud is actually greater than the energy of the bass, which is why rock music and dance music can give people a sense of power and energy, so that your heartbeat also beats with the rhythm of the drum tom, and it is indeed a great intensity of sound energy that is acting on you!

If the power is greater, it will become the legendary invisible killer sonic weapon.

Similarly, although the human ear is not sensitive to ultra-high-pitched sound waves, this part of the sound can still be applied to the human body through air vibration, and then pass through the skull to cause special stimulation to the brain inside, so that people can feel the existence of this part of the sound waves. Although their intensity is small and many people do not feel their presence, they are an important part of the timbre, giving the sound color, charm and emotion, that is, the so-called "thermal power has a strong force and a warm sound, and hydropower has a high sound resolution and a cold sound." Three-phase electricity is suitable for playing symphony, balanced! Nuclear power is suitable for playing the original soundtrack of "Transformers", and it is a pity that now power plants are connected to the Internet, and hydropower, thermal power, nuclear power, wind power, and photovoltaic power are all mixed together, and this day cannot pass the origin of "......".

Of course, this passage is actually a joke made up by audiophiles to laugh at themselves and ridicule each other, in fact, although the impact of the power supply on the audio system is there, it must definitely be ranked in the last position, far less than the speaker structure material, hardware factors such as power amplifier circuits and decoding chips, as well as software factors such as the sampling rate and coding rate of the sound source.

Interesting audiophiles who play audio look down on those who play headphones, because the headphones lack the "use of the body to feel the music", while the fans of traditional vinyl records also look down on those who play hifi, thinking that no matter how "high-fidelity" and how "lossless", when the music of continuous analog signals is converted into discrete digital signals, it is natural to lose some of the sound quality details, so it is still the most flavorful and charming vinyl old records.

Although there have long been music mobile phones and hifi mobile phones in mobile phones, using special audio decoding chips and high-end headphones to provide better music playback effects, Bee has not launched similar products, and the audio system has always been only the mainstream level of the market. Although they developed an ASP audio signal processor specifically for audio processing very early, and later integrated it into the bee heart SoC and became the standard configuration of bee mobile phones, the latter function is mainly used for the modification and beautification of digital audio signals and noise suppression, specifically it is used to optimize and beautify the voice effect, and the pursuit of high-restoration and high-fidelity HIFI take two paths.

Therefore, the word-of-mouth evaluation of the bee mobile phone in the headphone party and ordinary users is completely different, the former mockingly said that the mobile phone is not worthy of his good headphones and massive lossless music, while the latter is surprised that the sound coming out of the microphone is actually "magnetic". Of course, if you want to successfully beautify the "PS" sound, you also need both parties to use bee mobile phones, and both turn on the "beautiful voice" mode, and this will bring more distortion and need to get used to it slowly.

But in any case, at least the current bee mobile phones and the vast majority of mobile phones have reached the CD sound quality level from the hardware, which gives Atletico a chance.

You can use your phone's earpiece, speaker, and microphone as a special short-range communication device!

A piece of information can be encoded into extremely high-frequency sound waves sent out from the earpiece, which is inaudible to ordinary people, but the nearby microphone can receive it smoothly, and the original information can be obtained after re-decoding.

The disadvantages of this kind of "ultrasonic communication" are actually obvious, first of all, the amount of information carried is much smaller, and the "bandwidth" cannot be compared with wifi and Bluetooth at all, and secondly, the effective distance is relatively short.

However, it also has some very unique advantages, the first is that there is no need for wired and network support, as long as the audio system is well connected, it can be used for "wireless" communication, and the second is that it consumes less power and is more convenient to use.

The first advantage can be used for covert statistics, adding special high-frequency clips to video ads and game background music, and other bee devices can decode them until the latter hears which ad or which game. It's just that because of this suspicion of wiretapping, it has not been put into use on a large scale for the time being.

In contrast, it is the "collision connection" mode that bees are proud of first using this technology on a large scale, when two bee mobile phones touch each other, the quick connection program will be automatically activated, and the "ultrasonic communication" can be used to exchange identity information, and the WiFi connection can be quickly established after verifying the security, which is much more convenient than the user's manual WLAN direct connection.

In general, although ultrasonic communication has obvious shortcomings and may not pose a threat to the status of WiFi like VLC visible light communication, it is a powerful supplement to WiFi under certain conditions, and it is much more reliable than Bluetooth that is often turned off. And you don't have to keep the microphone always on, the co-processor integrated on the bee heart processor has the function of adjusting microphone sleep and fast wake-up, although it is prepared for voice control, but it is also possible to use part-time for "ultrasonic communication". For mobile phone users, please visit http://m.piaotian.net