FPV drones commonly use high-definition HDMI wire harnesses.

FPV drones commonly use high-definition HDMI wire harnesses.

• 2025-01-22 09:22:04
• by Admin

The full English name of HDMI is "High Definition Multimedia Interface", and its Chinese meaning is High - Definition Multimedia Interface.

The HDMI interface can provide a data transmission bandwidth of up to 18Gbps and can transmit uncompressed audio signals and high-resolution video signals. At the same time, there is no need for digital-to-analog or analog-to-digital conversion before signal transmission, which can ensure the highest-quality audio and video signal transmission.

The advantage of applying HDMI is that only one HDMI cable is needed to transmit both audio and video signals simultaneously, and higher-quality audio and video transmission can be achieved.

The integrated high-definition and 4K ultra-high-definition core modules of Xuanzhan Technology often use the HDMI interface. Through Micro HDMI to LVDS conversion, 1080P high-definition and 4K ultra-high-definition audio-visual signals of the core module can be transmitted.

PART.1 The History of HDMI

The HDMI interface was born as early as December 2002.
At that time, the version was 1.0. Its most prominent feature was the integration of a digital interface for audio streams. Compared with the DVI interface, which was very popular in the PC interface at that time, the HDMI 1.0 version supported video streams from DVD to Blu-ray format. It could form a common connection among all connected devices and have more convenient control over the device group.
From HDMI 1.0 to HDMI 2.0b, it has gone through nine stages.
The bandwidth of HDMI 2.0 has been expanded to 18Gbps, supporting plug-and-play and hot-swapping, 3840×2160 resolution, and 50FPS and 60FPS frame rates. At the same time, in terms of audio, it supports up to 32 channels and a maximum sampling rate of 1536kHz.
HDMI 2.0 does not define new data cables, connectors, or interfaces, so it can maintain perfect backward compatibility with HDMI 1.x, and existing type-II data cables can be used directly.
HDMI 2.0 will not replace HDMI 1.x but is an enhancement based on the latter. Any device that wants to support HDMI 2.0 must first ensure basic support for HDMI 1.x.

PART.2 The Interface Types of HDMI

The HDMI interface is divided into 5 types: A, B, C, D, and E.
Type A is the most common.
Generally, video devices such as flat-panel TVs or core modules provide this - sized interface. Type A has 19 pins, a width of 13.9 mm, and a thickness of 4.45 mm. 99% of the devices we can see now have HDMI interfaces of this size.
Type B is very rare.
It has 29 pins and a width of 21 mm, and its transmission bandwidth is almost twice that of Type A. It is completely "too powerful" for home applications and is now only used on some professional occasions.
Type C is designed for small-sized devices.
Its size is 10.42×2.4 mm, nearly one-third smaller than Type A, and its application range is very small.
Type D is the latest interface type.
The size is further reduced, and it adopts a double-row pin design. Its size is similar to that of a mini USB interface and is more suitable for portable and in-charge devices.
Type E is mainly used in in-car audio and video.
Due to the instability of the in-car environment, the HDMI E Type is designed to have characteristics such as earthquake resistance, moisture resistance, high-strength resistance, and a large temperature-difference tolerance range. In terms of physical structure, it adopts a mechanical locking design to ensure contact reliability.
Although the HDMI interfaces are different, their functions are the same. Usually, a qualified HDMI interface has a plug-and-unplug life of no less than 5000 times. If it is plugged and unplugged every day, it can be used for 10 years, which can be said to be very durable.
It is also worth mentioning that HDMI can be backward-compatible with the DVI interface. Through an HDMI - DVI adapter, some older DVI devices can be connected. Because DVI also adopts the TMDS method, after the device is connected, it will be found that the DVI device does not have the CEC (consumer electronics control) function and cannot receive audio signals, but it does not affect the transmission of video signals (it may be necessary to adjust the grayscale). Therefore, some monitors with only DVI interfaces can also be connected to HDMI devices.