Smart TV is a little lost? Take you to understand common interface functions
There are various interfaces on the TV. Although it is hidden on the back of the TV, it plays an important role. Before buying a TV, you must find out the specific uses of various interfaces. On the one hand, you can ensure that the commonly used interfaces are not missing. The extra purchase of the transfer device, on the other hand, knows the usefulness of each interface to take full advantage of the features of the smart TV.
1, HDMI
In the era of high definition, HDMI has become a must-have interface for TV. Cable set-top boxes, network set-top boxes, computers, audio and other devices can be connected to TV through HDMI cable, so it is often necessary for TV to have several HDMI interfaces. Most TVs currently have 2-3 HDMI ports, which may vary.
The HDMI organization officially released the HDMI version 1.0 standard on December 9, 2002. Now it has evolved to HDMI2.1. Since HDMI 2.1 is not yet popular, HDMI 2.0 is the latest version so far. HDMI2.0 was proposed in September 2013, the bandwidth is 18Gbps, compared with the previous version of 10.2Gbps has a big improvement, and later has HDMI2.0a and HDMI2.0b, the overall change is not big, HDMI2.0a With support for HDR, HDMI 2.0b optimizes locally.
At present, the common HDMI interfaces on smart TVs are 1.4 and 2.0. Although HDMI1.4 has already met the requirements for outputting 4K video, HDMI2.0 has increased the number of frames to 50/60 (previously 24/30), which has improved. The fluency of the picture is very necessary when connecting to a PC to play games, etc., so at least ensure that the TV has an HDMI2.0 interface.
In addition to the different versions, HDMI also has functional differences, generally marked below the HDMI interface, common ARC, MHL and so on.
ARC refers to the Audio Return Channel, which enables the TV to reversely transmit digital audio signals to the amplifier or HDMI ARC-enabled audio equipment via the HDMI cable without relying on fiber/coaxial audio output. The interface is very necessary when setting up a home theater.
MHL refers to Mobile High-Definition Link. Through an MHL cable, audio and video signals from mobile terminals such as mobile phones and tablets (mainly Android devices) can be transmitted to the TV for audio and video transmission. It can also be used for charging. With the advancement of MHL technology, the output picture is getting higher and higher HD, and the supported charging power is getting higher and higher. The charging power of MHL3.0 is 10W (5V/2A).
Realizing MHL not only requires TV interface support, but also supports mobile phones. However, the number of mobile phones supporting MHL is limited at present, so whether the HDMI interface has MHL function is not critical, and the wireless screen is more convenient than it. many. In addition, even if the HDMI interface of the TV does not support MHL, the same screen can be realized by the converter.
2, USB
Everyone is familiar with USB. It can be used to connect storage devices, external cameras, gamepads, etc., and can temporarily charge mobile phones. Like HDMI, USB has the difference in version. Commonly, it is USB2.0 and USB3.0. They are easy to distinguish. The plastic board in the middle of USB2.0 is white or black, and the plastic board in the middle of USB3.0 is blue. .
The transmission speed of USB3.0 is 10 times that of USB2.0, so that the smooth playback of 4K ultra-high definition video is not necessary, which is essential for audio-visual enthusiasts.
3, SD card
Smart TV storage space is not large, some are still 4GB or 8GB, and the larger one is only 16GB, can not install too much, so some TV manufacturers follow the phone to add a memory card interface. In addition, there is an advantage in providing an SD card slot. The photos taken by the camera do not need to be transferred to the USB flash drive, and can be viewed by directly plugging into the TV.
4, optical audio output
In addition to HDMI, the external audio or amplifier of TV is more commonly used S/PDIF (Sony/Philips Digital Interface, a digital audio output interface jointly developed by SONY and PHILIPS), which can be transmitted by coaxial cable or Use fiber optic transmission.
The identifier of the fiber interface is Optical, and its physical interface has two types: square head and round head.
5, coaxial audio output
Coaxial audio output is more common than fiber audio output. Its logo is COAXIAL. If only S/PDIF output is mentioned, it is also referred to as coaxial audio output.
6, AV input
The AV input interface is already available on very early CRT TVs. The AV line consists of three colors: red, white and yellow. The yellow line is the video transmission line, and the red and white are responsible for the sound transmission of the left and right channels. Since the AV input method will cause loss of the color signal, the chrominance signal and the luminance signal will also interfere with each other, affecting the quality of the final output image, and try not to use it.
7, color difference input
The color difference component interface has also appeared in the CRT era, and the video transmission quality has been greatly improved compared to the AV interface. The color difference component line consists of five lines. Three transmission images and two transmission audios are troublesome to use. With the rapid spread of HDMI, there are fewer and fewer TVs equipped with this interface.
8, the network
After the TV is intelligent, the network interface is basically the standard of the TV, which is more stable and reliable than the wireless connection.
9, RF input
RF input is commonly known as antenna. It is the input interface of RF signal. If you are using a cable digital set-top box, this interface is useless. If you are using traditional cable TV, or watching DTMB terrestrial digital TV (external antenna receiving signal), Use this interface.
The above are some common interfaces of TV. When you buy a TV, you need to pay attention to its specifications and functions in addition to the lack of interfaces to avoid it. Also pay attention to the location of the interface, especially those commonly used interfaces, which should be easy to wire and easy to plug and unplug.
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