The surface that the optical mouse slides is illuminated by an LED—usually using some optical components to convert a single point source into a larger range of light. The light illuminating the surface of the mouse pad is then directed to a second curved lens that focuses the reflected light from the illuminated area onto the lower resolution image sensor. Regardless of the pixel size, image processing can "read" the precise characteristics of the surface of the mouse pad and determine the relative direction of the image movement to identify the action. By observing the passing environment, the mouse can recognize the route it is moving.
This blue light technology is said to provide higher contrast images, and to some extent similar to ultraviolet light, allowing hidden details to be presented one by one. Microsoft has also used the diffusivity of LED light sources to provide a more uniform luminous flux in the illuminated area.
After removing all the hidden screws, Microsoft's Blue-Track mouse can be seen at a glance. The LED used for tracking is a simple positioning guide assembly with optical molding. This translucent milky capsule sealing material can be used. Achieve transmission characteristics. Several other blue LEDs surround the mouse, but their role is only to decorate, illuminate the product logo, or form a blue glow around the mouse casing like a haloeffect. The other half of the optical device is a CMOS image sensor and image processor ASIC designed and manufactured by Microsoft Corporation. The built-in window in the sensor package enables the reflected image to reach the 24×24 pixel array of the component (the resolution is still low in terms of imaging standards, but it is more than enough for this). Because the component has control, processing, and imaging capabilities (all powered by two AA batteries), using a small pixel array reduces power consumption and can increase frame processing speed under specific power conditions. The ASIC uses Atm el's 32Kb (4KB) EEPROM to store embedded program code.
Optical technology introduces another key feature of the mouse design in the scroll wheel - the mold 'roller' for scroll control forms an optical chopper and is applied to the wheel motion sensing of the LED/phototransistor. Other mouse input functions are quite rich, but like the simple surface mount switch activated by the usual left/right mouse button, and the action of pressing and tilting the wheel for special functions. Because the mouse lacks other logic, the controller's switches, the wheel chopper code, and the USB communication itself are all done on Microsoft's main ASIC. The design uses the most popular wireless link between the mouse and the host computer without having to use cluttered cables. On the host side, a small USB dongle is used to receive all the mobile data from the mouse; but interestingly, the chip solution does not conform to the WirelessUSB standard established by the USB Industry Alliance. NordicSemiconductor offers proprietary 2.4GHz transceivers at both ends of the link (but with slightly different ends). The mouse uses Nordic's NRF24L01 component, while the USB part uses the NRF24LU1 component. The EEPROM is built into the transceiver's single chip, so no additional memory is required.
Most of the electronic components of the mouse are concentrated on two large printed circuit boards, and the rollers and switches are located on the expansion board that is connected to the flexible circuit. A total of about twelve molded dies are required, and the small internal screws are used to hold all the molds and other components together.
BlueTrack, which has almost any surface that can slide, uses Blu-ray LEDs to capture the market for traditional optical mice.
LTE CAT4/CAT6 Definition
The full name of LTE CAT is LTE UE-category, which is broken down to explain :LTE refers to 4G LTE network, UE refers to user equipment, and Category is translated as level. Smooth interpretation is the level of 4G LTE network transmission rate that user devices can support, which can also be said to be a technical standard for 4G network speed. Therefore, LTE CAT4/CAT6 means that the user device LTE network access capability level is 4 or 6.
Since the level is different, then its capabilities are certainly not the same, let's take a look at LTE CAT4/CAT6 affect what performance, respectively, what level. Simply put, LTE CAT affects the upper limit of 4G LTE uplink and downlink network speed, which is generally referred to as the maximum upload and download speed that a user device can achieve.
There are not only 4 and 6 levels in LTE CAT, but the table above is our list of currently known LTE CAT levels and the corresponding maximum transmission speed. Among them, LTE CAT4/CAT6 is also the current network transmission technology level of 4G mobile phones, while the faster CAT7 and CAT8 are still in the laboratory stage and have not been commercially developed.
Phones and chips that support LTE CAT4/CAT6
As far as the current 4G mobile phone market is concerned, most mobile phone products are CAT4 technology, and only a small number of new mobile phones use CAT6 technology, such as Huawei Honor 6, Samsung Galaxy S5 advanced version and LG G3 Cat6, and the concept of LTE CAT6 is proposed by Huawei Honor 6.
For the mobile phone LTE CAT4/CAT6 standard, it is directly linked to the mobile phone chip, or, if you know the processor of the mobile phone, you know which technology the mobile phone uses. For the current 4G mobile phone chips, only Huawei Kirin 920 and Qualcomm Snapdragon 805 processors for LTE CAT6, before this 4G chips are LTE CAT4, the future and Kirin 930, Qualcomm Snapdragon 808/810 will support LTE CAT6. Mediatek won't have LTE CAT6 chips until the second half of next year.
Qualcomm Snapdragon 805, 808, and 810 also support LTE CAT6
It is worth mentioning here that Qualcomm Snapdragon 805 and Kirin 920 are not the same in chip design, the LTE CAT6 baseband of Snapdragon 805 is an external Gobi MDM9x35, while Kirin 920 is a direct SoC integration, and the chip is integrated, this point Kirin 920 has ultra-high integration. It has certain advantages in power consumption and cost. As a leading international communications company, Huawei's strength can not be underestimated, but also the pride of our people.
The actual use value of LTE CAT6
Upload, download speed is our use of mobile Internet access the most concerned performance, but it should be clear that the LTECAT standard is the 4G transmission speed limit, and can not improve the transmission speed, in the operator's 4G network speed has not reached the next standard, simply raising the limit is meaningless. At present, the 4G networks of domestic operators are all LTE CAT4 standards, and the peak download speed is 150Mbps, but it is difficult to reach the upper limit of LTE CAT4 in practical applications, and even to reach 100Mbps is very difficult, so at this stage LTE CAT6 has no use value.
In terms of real life applications, LTE CAT6 is not as beautiful as we think. We can do a calculation, according to the formula 1MB/s=8Mbps, the maximum download speed of LTE CAT4 is 18.75MB/s, such a download speed, for 1080P video online playback has no pressure, even 4K online film source still can not occupy such a large bandwidth, So LTE CAT6 has no use either.
To sum up, LTE CAT6 does not have much use value at this stage, and the term is only a gimmick of manufacturers, until the operator 4G standard reaches LTE CAT6, I believe that LTE CAT6 equipment has long been popular. So as for whether the phone is LTE CAT4 or LTE CAT6, you don't have to care.
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