With the development of society and the improvement of science and technology, people have put forward higher requirements for the safety and entertainment of driving cars. The car's central rearview mirror was developed into an integrated intelligent rearview mirror with multiple functions, including Android, WinCE and other operating systems. Automotive smart rearview mirrors will be more closely connected with the Internet, the Internet of Vehicles, and the Internet of Things, bringing more safety, entertainment and convenience to the driving life of many car drivers. Smart rearview mirrors will also become An indispensable configuration on the car!
The intelligent rearview mirror has an independent operating system and independent running space. The user can install programs such as software, games, navigation and other third-party service providers, and can realize wireless network access through WIFI or mobile communication network. It can provide intelligent car rearview mirrors with functions such as driving record, GPS positioning, electronic speed reminding, reversing visual, real-time online audio and video entertainment. With excellent operating system, freely installable software, and touch-screen operation, these three features provide voice control, navigation, speeding reminders, driving records, and real-time online audio and video safety and entertainment functions when driving a car. .
Intelligent rearview mirrors are generally tested for extreme conditions, such as temperature, continuous vibration, etc., but if it is ultra-low temperature or ultra-high temperature, it will not work properly. So what are the functions of smart rearview mirrors?
1. Driving Record The rear camera of the intelligent rearview mirror uses the built-in camera or the installed camera to record the front and rear images of the vehicle in the middle of the journey and automatically save it in the storage device of the smart mirror.
2, speed warning, the navigation software in the smart rearview mirror operating system generally has a built-in fixed electronic speed reminder, some smart rearview mirrors with radar probes, real-time discovery of mobile speed and alarm sound, avoiding car speeding, ensuring safety at any time drive.
3. Reversing the car, the smart rearview mirror can display the image behind the car after reversing the camera after installing the reversing camera.
4, GPS positioning navigation, GPS, Beidou satellite or network real-time positioning, you can use the pre-installed Baidu map, Gaode navigation or Kay LiDE navigation and other navigation application software to achieve navigation, and voice broadcast navigation information. After connecting to the network, you can also broadcast real-time traffic conditions to avoid congestion.
5, find the car position intelligent rearview mirror navigation function smart rearview mirror using GPS, Beidou satellite or network positioning to get the exact location of the car, on the authorized smartphone or tablet, connect to the network dedicated The application finds the location of the car.
6. Based on the support of the network voice command library, the operating system in the smart rearview mirror can accurately resolve the user voice command and respond to realize the intelligent voice dialogue between the person and the car. Ability to recognize voices such as "call a call, open an app, play music, voice chat".
7. Bluetooth hands-free phone, smart rearview mirror adapted to smart phone, synchronous mobile phone address book, call record; realize phone answering, hanging up, and do not disturb function; also realize car friend intercom, Bluetooth synchronous mobile phone music playback, Built-in 3G network module, and friends in the car use wifi to share wireless network, online music, listen to news information, install such as WeChat, Weibo, mobile Taobao, Alipay, Himalayan, Netease client, Tencent client and other life entertainment applications.
First, Wireless Router
So what is a wireless router?
Wireless router, according to the definition of Baidu Encyclopedia: Wireless router is used for users to access the Internet, with wireless coverage of the router.
A wireless router can be thought of as a repeater that forwards the broadband network signal from the wall of your home through an antenna to nearby wireless network devices (laptops, Wifi-enabled phones, tablets, and all Wifi-enabled devices).
The popular wireless routers in the market generally support four access methods: dedicated xdsl/cable, dynamic xdsl, pptp, and generally can only support 15 to 20 devices online at the same time. It also has some other network management functions, such as dhcp service, nat firewall, mac address filtering, dynamic domain name and so on. The signal range of the general wireless router is 50 meters radius, and the signal range of some wireless routers has reached 300 meters radius.
The name of wireless router can be separated out of two keywords: wireless and routing.
Understand the technical principle behind these two words, you understand the wireless router.
Wireless is also what we often call Wi-Fi. Wireless routers can convert home broadband from wired to wireless signals, and all devices can happily surf the Internet as long as they connect to their own Wi-Fi. In addition, these devices also form a wireless local area network, where local data is exchanged at high speed and is not limited by the bandwidth of home broadband.
For example, many people have smart speakers in their homes that can be used to control various smart appliances. When you say small X small X, turn on the TV, the speaker actually finds the TV through the LAN and sends instructions, and does not need to connect to the Internet; And if you let it broadcast news, you have to get data through the Internet.
The Local Area Network we talked about earlier, also known as the Intranet, is represented by the Local Area Network (LAN) on the router, so the Wi-Fi signal is also called WLAN(Wireless LAN); The Internet we want to access, also known as the extranet, is represented on the router by the WAN(Wide Area Network).
On the Intranet, the IP address of each device is different, which is called a private address. All devices on the Internet share the same public address, which is assigned by broadband operators such as China Telecom Unicom.
The router is the bridge between the Intranet and the external network. The above mentioned IP address translation, packet forwarding, is the router routing function. In other words, the router is the hub of the home network, and the data of all the devices must be forwarded through it to access each other or reach the external network, which means that one husband is the key and ten thousand men are not open, so the comprehensive router is also called "home gateway".
Second, the demand for wireless routers
I do not know if there is a sudden WIFI break when you play games at home, and a stable router is crucial at this time. However, it is important to note that your WIFI frequently dropped may not be a problem with the router, it may also be a problem with the carrier network. (Router means I don't back this pot)
In fact, for most people, there are two basic requirements for wireless routers
Stable and do not drop
Fast Internet and easy setup
Some people will have some advanced needs:
There are some features, USB interface, can be external U disk or hard disk, can achieve simple nas functions, QOS, etc., to advertising and so on
Mesh networking, when the house area is large, multiple routers can be used for Mesh networking
How to choose a wireless router
The wireless router market is in the transition stage from WiFi 5 to WiFi 6, if you want to buy the first choice is definitely WiFi 6 wireless router, which is the future trend.
The speed of WiFi 6 is nearly 40% higher than the previous generation 802.11ac, and the highest connection speed can even reach 9.6Gbps, while the highest speed of 802.11ac is only 6.93Gbp. More importantly, unlike 802.11ac, which only covers the 5GHz band, WiFi 6 covers 2.4GHz and 5GHz. Although the 5GHz band has less interference, it has weak wall penetration ability, and the 2.4GHz band has strong wall penetration ability, which takes into account each other.
So why choose a WIFI6 router?
Compared with the previous generation of 802.11ac WiFi 5, the maximum transmission rate of WiFi 6 in the 5Ghz band has been increased from 3.5Gbps to 9.6Gbps, and the theoretical speed has been increased by nearly 3 times. WiFi 6's 5Ghz single-stream 80Mhz bandwidth can reach theoretical speeds of up to 1201Mbps and 160Mhz bandwidth of up to 2402Mbps.
The band supports 2.4Ghz and 5Ghz.
In terms of modulation mode, WiFi6 supports 1024-QAM, which is higher than the 256-QAM of WiFi 5, and the data capacity is higher. Some high-end WiFi 6 routers support 4096-QAM.
WiFi6 supports MU-MIMO (multi-user multiple-input multiple-output) technology, and supports both upstream and downstream MU-MIMO, with a maximum support of 8T×8R MU-MIMO. The speed is greatly improved. High concurrency, WiFi6 5GHz band, terminal connections up to 128! 5 times that of WiFi5. Effectively solve the Internet needs of multi-person networking and smart home;
WiFi6 adopts OFDMA (orthogonal frequency division multiple access) technology. After using OFDM to parent the channel, the transmission technology of transmitting data is loaded on the subcarrier, allowing different users to share the same channel, allowing more devices to access, with shorter response time and lower delay.
Low latency, WiFi6 time delay can be as low as 10ms, compared to WiFi5 30ms delay, only 1/3. This performance refresh is extremely friendly to game lovers;
If WiFi6 (wireless router) devices need to be certified by the WiFi Alliance, they must use the WPA 3 security protocol, which is more secure.
The WiFi6 wireless router is backward compatible with WiFi5 and WiFi4 terminals.
Fourth, the misunderstanding of purchasing routers
Is the through-wall router really through-wall?
Mistake; The country has strict limits on the transmission power of the wireless router antenna, if you have a lot of rooms in your home, and there are many walls between them, even if you buy an expensive wireless router, you can not do one to cover all the room signals. If the signal is not good, you can consider multiple wireless router Mesh networking.
Does a wireless router have a stronger signal with more antennas?
More antennas just to match the X*X MIMO mode, the more antennas, the more channels, can only ensure that the network is more stable, the impact on the signal is little, the strength of the signal is only related to the wireless transmission power. The wireless transmission power of the country has a standard.
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Shenzhen MovingComm Technology Co., Ltd. , https://www.movingcommtech.com