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Analysis of Two HDMI Connector Technologies
Release time：
2021-08-11 14:01
HDMI connectors are widely used, especially in the current market trend of integrated Internet TV and home appliance ecosystems. Guoguang Group introduces high-definition TV set-top boxes, DVD players, personal computers, video game consoles, integrated amplifiers, digital audio, and televisions. HDMI interfaces can be divided into three types: Type A, Type B, and Type C. Each type of interface consists of a socket for the device end and a plug for the cable end.
I. Can HDMI connectors transmit both audio and video signals simultaneously?
From some information platforms, I understand that HDMI connectors are easy to use; with just one cable, both audio and video can be transmitted. Is this statement true?
Our user survey shows that when some users first encounter HDMI interfaces, they assume that the so-called "high-definition one-cable solution" means simultaneous transmission of audio and video signals. However, after buying a liquid crystal display (LCD) TV, they find that there is no sound when connecting a computer using the HDMI port.
Why is this?
Guoguang Group, an HDMI connector manufacturer, analyzes that in most computers, audio and video signals are independent and output separately. The video signal is output from the computer's graphics card or integrated graphics card on the motherboard, but the audio needs to be output from the sound card or integrated sound card on the motherboard. Therefore, even if the graphics card is equipped with an HDMI or DVI interface, only the video signal is transmitted, not the audio. Users need to output audio separately to hear the corresponding sound.
When consumers purchase LCD TVs and plan to use HDMI or DVI to connect to a computer, they should consider whether the product has a dedicated audio input interface for the HDMI interface. If not, they need to configure speakers for the computer's audio output.
II. Is it true that you should not hot-swap HDMI connectors?
Guoguang Group understands that some say it supports hot-swapping, while others say it doesn't. Let's explain this from several technical aspects:
The principle of hot-swapping HDMI connectors:
A half-length pin, called a Hot Plug Detect pin, is placed on the 19th pin of the HDMI female connector. When the HDMI is unplugged, this hot plug detection pin disconnects first. Then, the HDMI circuit detects the disconnection and notifies the input and output devices to stop working, achieving hot-swapping. The principle of hot-swapping is achieved by the different lengths of the interface pins, similar to the hot-swapping of USB. The USB interface has four gold fingers inside. The two longer ones are for power supply, ensuring power is supplied first during plugging and unplugging, followed by data exchange, ensuring that hot-swapping does not damage device data.
In addition to supporting hot-swapping, HDMI connector devices also support "plug and play," which greatly increases the popularity of HDMI devices. Guoguang Group, as a connector manufacturer, shares its technical applications of various connector interfaces.
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