Explain the type and advantages of HDMI interface

JYFT is a professional HDMI cable Factory. Our HDMI is the most common interface for video signal transmission now, but there are several versions of HDMI 1.4, HDMI 2.0, HDMI 2.0a, and so on. It is an important way to link high-definition multimedia and TV. It is a digital video / audio interface technology that can simultaneously transmit image signals and audio signals without the need for digital-to-analog conversion. And it is convenient to transmit video and audio signals. It is also a video decoding output device, which can transmit video and audio to the delivery device with high efficiency through HDMI. It is often used in multimedia devices such as smart TVs, set-top boxes, and projectors.

The technology that first appeared in the digital transmission field was DVI instead of DHMI. With the development of digital high-definition audio and video technology, the problem of DVI interface have been getting more and more. Therefore, manufacturers involved in multiple fields urgently need better high-definition video interface technology. This led to the birth of standard HDMI.

Interface type of HDMI

HDMI interface is divided into A, B, C, D,total 4 types. Type A (Type A) is the most common. General flat-screen TVs or video equipment provide interfaces of this size. Type A has 19 pins, width 13.9 mm, and thickness 4.45 mm. Devices that can be seen now 99% are all HDMI interfaces of this size.

Type B (Type B) is very rare. It has 29 pins and a width of 21 mm. The transmission bandwidth is almost double that of Type A. It is completely too "tough" in home applications, and is only used in some professional occasions.

Type C (Type C) was born for small devices. Its size is 10.42 × 2.4 mm, which is nearly 1/3 smaller than Type A, and its application range is very small. 

Type D (Type D) is the latest type of interface, which has been further reduced in size. It has a double-row pin design with a size similar to the mini USB interface, which is more suitable for portable and automotive equipment.

Although the HDMI interfaces are different, the functions are the same. Generally, qualified HDMI interfaces have a plug-in life of no less than 5,000 times, and can be used for 10 years even plug in and plug out every day, which should be said to be very durable. It should be pointed out that HDMI can be backward compatible with the DVI interface. Through the commercially available HDMI-DVI adapter, you can connect some older DVI devices, because DVI also uses the TMDS method. After the device is connected, you will find DVI devices does bot have CEC (consumer electronics control) function, and can not accept audio signals, but usually not affecting the transmission of video signals .Therefore some monitors with only DVI interface can also connect HDMI devices.

In addition to the different types, the HDMI interface also corresponds to different functions. As shown below:

1: HDCP 2.2, which protects high-value digital movies, TV shows, and audio content from illegal theft and copying.

2: HDMI-ARC (Audio Return Channel) function, which is used for the digital audio output of the TV. It can be connected to a power amplifier that also supports the ARC function to transmit the TV's sound to the power amplifier.

3: bit refers to the color depth, the general notebook screen is 6bit, some high-end 8bit, particularly professional 10bit, can be understood as the color depth of the 10^th power of 2, and 10bit specially refers to a video coding technology, which can provide very high video quality, can show extraordinary fineness in the gradation and change of color, but the configuration requirements to play 10bit is still very high.

4: MHL technology uses only five cables to transmit up to 4K UHD uncompressed video with eight-channel digital audio, while also charging mobile devices.

Advantages ofHDMI:

1. Good quality: The digital interface has no loss of analog-to-digital conversion and can provide the best video quality. This is especially noticeable at high resolutions such as 1080p and even 4K.

2. Easy to use: One line integrates video signals and multi-channel audio signals, which is much more practical than the case where multiple lines were connected in the past.

3. Intelligent: HDMI supports two-way communication between video sources and playback devices, and realizes new functions, such as automatic configuration and one-click playback. By using HDMI, the device automatically transmits the most efficient format for the connected display device (for example, the TV supports up to 4k30P, and HDMI will return the information, and the resolution is automatically set to 4k30P in the box), thus the user does not need to try to set resolution himself.

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