Smart TV purchase instructions take you through common interfaces and functions

There are various kinds of interfaces on the TV. Although hidden behind 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 commonly used interfaces are not missing. The additional purchase of switching equipment, on the other hand knows the usefulness of each interface to take full advantage of the various features of smart TV.

1, HDMI

Nowadays, HDMI has become an essential interface for TVs. Cable set-top boxes, network set-top boxes, computers, and audio devices can all establish connections with TVs through HDMI cables, so TVs often require several HDMI interfaces. At present, most TVs are equipped with 2-3 HDMI interfaces and the versions may differ.

The HDMI organization officially released the HDMI 1.0 standard on December 9, 2002. Now it has evolved to HDMI 2.1. Since HDMI 2.1 is not yet available, HDMI 2.0 is the latest version to date. HDMI2.0 was proposed in September 2013, with a bandwidth of 18 Gbps. Compared with the previous version of 10.2 Gbps, it has been greatly improved. HDMI 2.0a and HDMI 2.0b are later available, and the overall change is not so great. HDMI 2.0a With the support for HDR, HDMI 2.0b optimizes the local area.

Currently, the common HDMI interfaces on smart TVs are 1.4 and 2.0. Although HDMI 1.4 has reached the requirement for outputting 4K video, HDMI 2.0 increases the number of frames to 50/60 (previously 24/30), improving the The fluency of the screen is very necessary when connecting to PCs to play games and other scenarios, so at least ensure that the TV has an HDMI 2.0 interface.

In addition to the different versions, HDMI has a functional difference. Generally, there will be an annotation below the HDMI interface. Common ARC, MHL, and so on.

ARC refers to the Audio Return Channel. This function allows the TV to transmit digital audio signals back to the amplifier or HDMI ARC-enabled audio device via the HDMI cable without relying on fiber/coaxial audio output. The interface is very necessary when building a home theater.

MHL refers to the Mobile High-Definition Link, which can transfer audio and video signals of mobile terminals (mainly Android devices), such as mobile phones and tablet PCs, to TVs via an MHL cable. Can also be used for charging. With the advancement of MHL technology, the output picture is getting more and more high-definition, supporting higher and higher charging power, MHL3.0 charging power is 10W (5V/2A).

Realizing MHL not only needs the TV interface to provide support, but also the mobile phone to support this function, but at present, the number of mobile phones supporting MHL is limited, so whether the HDMI interface has the function of MHL is not critical, and the wireless screen mode is more convenient than it. many. In addition, even if the HDMI interface of the TV does not support the MHL, the same screen can be implemented through the converter.

2, USB

USB is very familiar to everyone, can be used to connect storage devices, but also external cameras, game controllers and other equipment, but also temporarily for mobile phone charging, use a lot. Like HDMI, USB has a difference in the version, common is USB2.0 and USB3.0, they are easy to distinguish, USB2.0 middle plastic board is white or black, and USB3.0 middle plastic board is blue .

USB3.0 transmission speed is 10 times that of USB2.0, so as to ensure smooth playback of 4K ultra-high-definition video is not stuck, for audio and video enthusiasts is essential.

3, SD card

Smart TV storage space is not large, some still 4GB or 8GB, the larger is only 16GB, can not load too much, so some TV manufacturers to follow the mobile phone to increase the memory card interface. There is also an advantage of providing an SD card slot. The photos taken by the camera do not need to be transferred to a USB flash drive. You can view the photos directly by plugging them into the TV.

4, optical audio output

In addition to using HDMI for external audio or power amplifiers, S/PDIF (Sony/Philips Digital Interface, a digital audio output interface jointly developed by SONY and PHILIPS) can be used. Use fiber optic transmission.

The identifier of the optical 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 identification is COAXIAL. If only the S/PDIF output is mentioned, it usually refers to the coaxial audio output.

6, AV input

The AV input interface is already available on very early CRT TVs. The AV cable consists of red, white, and yellow colors. The yellow line is the video transmission line. Red and white are the sound transmissions for the left and right channels. Because the way of AV input will cause the loss of the color signal, the chroma 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 component input

The color difference component interface also appeared in the CRT era. Compared with the AV interface, the video transmission quality has greatly improved. The color-difference component line consists of five lines, three of which transmit images and two of which transmit audio. It is somewhat cumbersome to use. With the rapid popularity of HDMI, there are fewer and fewer TVs equipped with this interface.

8, network

After the television is intelligent, the network interface is basically the standard of the television, and is more stable and reliable than the wireless connection.

9, RF input

RF input commonly known as the antenna, it is the input interface for RF signals, if you use a cable digital set-top box, then this interface is useless, if you use a traditional cable TV, or watch DTMB ground wave digital TV (external antenna receiving signal), are Use this interface.

These are some of the common interfaces for TVs. When you buy a TV, you need to check whether the interface you use is missing. Also pay attention to its specifications and functions, and avoid using it later. Also pay attention to the location of the interface, especially those commonly used interfaces, should be easy to wire and easy to plug.