【 Weak current College 】 talk TV interface

Now TV behind the hordes of interface, first glance past daze, a bit faint feeling. TV interface from the early days of the most common cable TV input, AV interface, S-Terminal, color difference component interfaces, VGA connector, DVI interface, USB interface, and so on, until now there have state-of-the-art digital HDMI high-definition interface. We know that the video interface development is a prerequisite for high-definition. High-definition television needs to provide the appropriate interface to fully play its high-definition picture.

TV interface, apart from being a replacement procedure, these interfaces or in order to meet the special needs of different groups and design. Here's the TV in a variety of common interfaces for an introduction, in order to help different people choose according to their own needs.

1. TV input connector:

TV interface also known as RF input, there is no doubt that this is on a TV first interface. TV interface Imaging is the video signals (CVBS) and audio (Audio) by mixing the encoded output, and then displays the device within a series of separation/decoding process output imaging. Due to the need for more steps for video, audio and video coding, so can cause signals interfere with each other, so it's picture quality output quality is the worst of all interfaces.
Second, AV interface (also known as RCA):

AV interface can be improved TV input interfaces, it interfaces with TV appearance has been much different. It is divided into three lines, namely: an audio interface (red and white line, left and right channels) and video (yellow). In the connect side is as simple as 3 color of the AV cable and TV-3 color interface corresponds to the connection. Due to the AV output remains the brightness and color blending of video signals, so you still need to show devices for brightness and color separation, and decodes to Imaging. This approach inevitably causes losses to the picture, the picture quality AV interface is still not satisfactory. Overall, AV interface enables separation of audio and video transmission, you can avoid the imaging, audio and video interfere with each other as a result of reduced picture quality. AV interface to connect a TV and DVD for use in a broad, is essential for each TV interface.

3. S Terminal:

S Terminal is AV Terminal improvement, in terms of signal transmission is no longer the chroma and Luma Blend output, but the separation of undertake signal transmission, so we call it "the component video interface". Compare with AV interface, S-Terminal is not on the color and brightness hybrid transmission, thus avoiding the device signal interference caused by the image distortion, can effectively improve the clarity of the picture.

Compare with AV interface, S-Terminal is no longer on the chromaticity and luminance hybrid transmission, thus avoiding the device signal interference caused by the image distortion, can effectively improve the clarity of the picture. But S-Video still wish to color and brightness two-channel signal mixed signals for all color imaging, so there was still a loss of picture quality. Although the S terminals are not the best, but in General AV signal to 640 line, S terminals up to 1024 lines, but this requires the ones to decide. Generally speaking, this kind of interface in DVD, PS2, XBOX, NGC, and so video and gaming devices.

IV. color difference component interface:

Current component interface application, and not very common. The main reason is some CRT TV set does not provide a color difference component input connector. Simply put, compared to the past of AV and S-Terminal, chromatic aberration is the signal is divided into red, green, blue three colors to enter. By adding these three color screen directly extracted will be even more clear, more lifelike colours. Color connection still need independent 2 audio line, similar to the AV in red and white line, left and right channels. Chromatic aberration is divided into progressive and interlaced, generally speaking component interface above there will be a few letters to represent progressive and interlaced. Use YCbCr representation is interlaced with YPbPr represents the line by line, if your TV only YCbCr component terminals, the TV does not support progressive component YPbPr component instead of the Terminal, it shows support for progressive and interlaced 2 component. In General, grades better TV has 2 groups even 3 sets of component interfaces, slightly less TV may have only one set of interlace, such as the above diagram of television is 2 group-by-line interface. This interface in DVD, PS2, XBOX, NGC, and so video and games are available on the device, the picture quality, something too S Terminal.

5. VGA interface:

VGA interface, also known as (S-Dub), is the analog signal transmission to the monitor interface. This is derived from the computer's input interface, because the CRT monitor cannot directly receive digital signal input, and so video card can only take the analog signal input monitor way to get the picture. VGA interface above 15 pinholes, divided into three rows, each row of five. VGA connector on the video card is the most widely used interface type, the vast majority of the video card with this kind of interface.
6 DVI interface:

Traditional CRT TV for technical reasons, you cannot directly receive digital signals, the CRT is endangered by LCD replaced trend. Due to the graphics processing of data signals are all digital, if you want to add the picture to the CRT display device, it must be through the DAC will digital signal to analog signal transmission and then in the past, but in the conversion process that will result in distortion of the picture. This trouble, and the picture quality will be distorted. So a DVI interface, which is all digital transmission interface, digital signal without conversion and direct transfer to the monitor.

But DVI cable length cannot exceed 8 metres, otherwise it will affect the image quality. But here's the basic no HDMICable length restrictions. But just one HDMI cable, you can replace up to 13 analog transmission, effectively solve home entertainment system wiring mess behind kink.

7. HDMI interface:

HDMI (HighDefinitionMultimediaInterface) is a high-definition multimedia interface abbreviation. HDMI is the recent interface, it is the same as DVI digital signal transmission, but the difference is that HDMI is not only can provide all-digital video signal, but can also transmit audio. It's like back to the cable television RF interface, just not the same as is, with all-digital signal transmission, not like RF, video and audio interference cause poor picture quality.

The biggest advantage of HDMI is a cable for audio and video signals transmitted simultaneously, not like this using multiple cables, significantly reduces wiring complexity. In simplifying the wire, with no compression of high definition digital video and up to 8-channel audio signal, with a maximum data transfer speed of 5Gbps bandwidth, allowing users to enjoy high quality digital entertainment experience, is the true HDTV audio and video transmission times.

HDMI to support all standard ATSCHDTV, not only can meet the most high definition 1080P resolution, also supports the most advanced DVDAudio digital audio formats, support for 8-channel 96kHz or stereo digital audio transmission, 192kHz and just one HDMI cable, exempt from the digital audio connection. At the same time the HDMI standard, additional space can be applied in future upgrades of audio and video formats. Compared with DVI HDMI interface is smaller, but can also transmit audio and video signals.

For flat-panel TV, the best video connection is the DVI or HDMI digital video interface on this class. HDMI was developed based on DVI, can be viewed as strengthening and extension of DVI, both of which can be compatible. But the current development situation is that HDMI has become the standard configuration of flat panel TV. New HDMI is backward compatible with analog signal, and upgrading of transmission bandwidth now! no doubt is HDMI. DVI and PC compatible, HDMI mainly for household appliances, in fact, both in the image area that can be used to convert head to convert. All the features of DVI and subsequent development of uses to be included in the HDMI interface.

HDMI is a two-way digital interface, that is either out or in, like a computer program "handshake". As a result of various electrical appliances manufacturers "handshake" process some differences, have found the "handshake" failed, simple is a compatibility problem. So we use have HDMI video equipment, it is best to choose the same label or choice is the world's leading manufacturers of the equipment produced.

From RF interface to HDMI interface, apart from being a replacement procedure, these interfaces or meet various needs of the population of design. So generally speaking, the TV will provide these behind most of the interfaces, but as technology standards, some interfaces have also been increasingly out of date. If the previous common AV interface, but now people are more willing to choose S Terminal or chromatic aberration, because not only convenient, but also to gain a better picture quality.

At present domestic television will enter the era of digital high-definition, it can be expected, the traditional TV interface and finally to be the future of digital HDMI interface supersedes!