Zašto se žali funkcija pametne narukvice?
The smart bracelet has promoted consumers' enthusiasm to exercise to a certain extent. Xiao Ge, who works in China World Trade Center, likes a Xiaomi bracelet he bought. "Since wearing the bracelet, I have fallen in love with walking. I like to wear it up and down the stairs instead of taking the elevator. With it, I also start to pay attention to my sleep. This little silicone gadget keeps me concerned about health. With it The road to health that accompanies me is not alone." Xiaoge said.
However, smart bracelets are also frequently "spit on" by consumers. "I once wore two bracelets at the same time. As a result, the Fitbit Flex bracelet counted 7,225 steps, but the UP bracelet only counted 7,095 steps, and when I lifted a barbell or rode a bicycle, the bracelet did not detect it. My normal arm swings, so it doesn't think I'm exercising, and the bracelet doesn't respond, but once I held an apple and put it in my mouth, the bracelet showed that my steps had changed!" I live in Cuiwei Road, Haidian District, Beijing Ms. Yan told reporters.
Monitoring sleep is one of the purposes of many bracelet buyers. Mr. Zhang, who lives in Fengtai District, Beijing, has a Xiaomi wristband. During use, he found that the sleep monitoring function of the wristband was defective. "The next morning, I will see the time of my deep sleep, light sleep, and the number of wakeups on the screen of my phone, but it is not completely accurate. When I turn over or move my wrist, it thinks I am awake, and the rest of the time. I was sure that I was in light sleep. Once I took a nap during lunch break, although I was lying basically still, but the bracelet did not think I was asleep." Mr. Zhang said.
Dr. Meng from Guang'anmen Hospital of Traditional Chinese Medicine introduced to reporters that the so-called smart bracelet is to infer the quality of sleep by sensing the state of the user's hands. When the bracelet is worn, it is often not close to the wrist, the blood oxygen saturation cannot be detected, and the position of the chip is not fixed, and it is impossible to accurately capture the pulse. When the user is physically active, the bracelet defaults to light sleep, and when at rest, it defaults to deep sleep. "Sleep detection" based on this principle can only be regarded as a kind of "sleep speculation", and it is not scientific.
The higher-end smart bracelet has a heart rate monitoring function. Aunt Lu, who lives in Taoranting Street, uses an Adidas miCoach Fit Smart smart bracelet that can monitor heart rate without wearing a heart rate belt, but sometimes the heart rate is not accurate, so it is better to count the heartbeat by yourself. For this reason, Aunt Lu's son bought her a bracelet with a heart rate sensor. "Although this bracelet is very accurate in measuring heart rate, the bracelet is too large and it is uncomfortable to wear when sleeping." Aunt Lu said.
Yao Wenqing from the University of Science and Technology Beijing, majoring in biotechnology, introduced to reporters that the reason for the large error in the heart rate monitoring of the wristband is that the wristband uses the optical principle to measure the heart rate. "That is, the sensor of the bracelet in contact with the skin will emit a beam of light hitting the skin, and then measure the reflected light. Because blood absorbs a specific wavelength of light, every time the heart pumps blood, this wavelength will be absorbed a lot. This is used to determine the heart rate. Because of the optical principle, it is easily affected by ambient light and skin color, resulting in inaccurate measurement results." Yao Wenqing said.
In addition, because of the small size of smart wearable devices and limited space, many bracelet users also expressed their dissatisfaction with the poor battery life of the ring, the need to connect to a mobile phone, and the poor independence.
Improve functions, it is time to develop standards
According to the global wearable device shipments released by IDC in the third quarter, the shipment of smart wearable devices reached 21 million, a year-on-year increase of 197 percent . The wearable device market is expected to grow to US171 million in 2016. However, as an emerging industry, the homogeneity of development is serious, and the market is mixed. It is imminent to seize the pain points of consumers and make improvements.
The low accuracy of step counting is the primary problem of the bracelet. A fitness bracelet contains an accelerometer and a three-dimensional motion sensor, and draws conclusions based on detecting the swing of the arm. "Most of the internal sensors of the smart bracelet use a three-axis accelerometer, which is not accurate, so it will cause deviations, and the algorithm is not perfect, resulting in errors of up to 25 percent in some smart bracelets. Movement of different devices There are differences in energy consumption, and the accuracy of energy consumption is based on the accuracy of steps, distance, height, weight, and age, so that relatively accurate values can be obtained. There is no GPS movement positioning function and calibration function of the bracelet. Adapted software is the fundamental reason for limiting the accuracy of data." said Wen Xiaojun, deputy director of the Institute of Electronic Information Industry, CCID Research Institute, Ministry of Industry and Information Technology.
Fu Liang, an independent telecommunications analyst, believes that smart devices cause frequent complaints by consumers, including sensor insensitivity, algorithm defects, and space limitations. Bracelet manufacturers should pay attention to consumer feedback and continuously improve their technology. "For example, the error of the smart bracelet monitoring heart rate is about 10 percent . The large error of the heart rate monitoring function is caused by the optical sensor. If a bio-impedance sensor is used to monitor the resting heart rate through the impedance of the human body, the error will be small and more Reference data." Fu Liang said.
"The most fundamental thing is to formulate industry development standards." Yang Xin, Secretary-General of Wearable Devices in China, said that the lack of standards makes it difficult for wearable devices to expand into social hot spots such as medical care, elderly care, and child tracking and positioning, which directly restricts the rapid development of the market. . As the equipment needs to be worn by users for a long time, safety and quality inevitably become important factors affecting its popularity. The safety of the equipment itself, battery, power adapter, wireless connection, electromagnetic compatibility, hazardous substances, etc., require all aspects of certification and evaluation to minimize possible harm to users. "The accuracy of basic data, software defects and other issues are worth considering, especially implantable products, which directly affect human health and need to be regulated by industry standards."
According to Yang Xin, the China Wearable Alliance has held a closed-door working meeting on "China Wearable Alliance Standards" on March 22, 2015, and is currently developing a batch of basic common features, key applications and key technical standards. "The next step will be to cooperate with the Ministry of Industry and Information Technology to invite wearable related companies to discuss and improve China's wearable standard system."
