HDMI interface connectors are currently widely used, especially under the current market trend of the integration of Internet TV and home appliance ecological chains. Guoguang Group introduced high-definition TV set-top boxes, DVD players, personal computers, TV game instruments, integrated amplifiers, digital audio and TV sets. HDMI interface can be divided into three types: Type A, Type B, and Type C. Each type of interface consists of a receptacle for the device end and a plug for the wire end, respectively.

1. Can the HDMI interface connector transmit audio and video signals at the same time?

The hdmi interface connector is understood from some data platforms, the hdmi interface connector is easy to use, as long as one line, audio and video can be fully transmitted. So is this claim true?

We have surveyed some users' feedback, and we can conclude that when some users just started to contact the HDMI interface, they think that the so-called "HD one-line communication" can transmit audio and video signals at the same time. I found that there is no sound from the TV after connecting it to the computer through the HDMI port.

So why is that?

Guoguang Group, an HDMI connector manufacturer, analyzed that the audio and video signals of most computers are independent of each other and output separately. The video signal is output from the computer's graphics card or the motherboard integrated graphics card, but the audio needs to be output from the sound card or the motherboard integrated sound card. Therefore, even if the graphics card is equipped with an HDMI or DVI interface, the part that can transmit only includes video signals without audio, and users need to output audio in order to hear the matching sound.

When consumers buy LCD TVs, if they plan to use HDMI or DVI to convert and access computer signals, they should consider in advance whether the product has a special audio input interface reserved for the HDMI interface. If not, they should configure speakers for the computer's sound output. .

2. Is it true not to hot-plug the HDMI interface connector cable?

Guoguang Group has learned that some say that it can support hot swap, and some say it cannot. So let's explain from several technical principles:

The principle of HDMI interface connector supporting hot swap:

On the 19th pin of the HDMI female header, a half-cut pin is placed, called Hot Plug Detect. When the HDMI is pulled out, the hot-plug detection pin is first disconnected, and then the HDMI After the circuit detects that it is disconnected, it notifies the input and output devices to stop working and play the role of hot swapping. The principle of hot-plugging is achieved according to the length of the interface pins, which is similar to the hot-plugging of USB. There are four golden fingers inside the USB interface, and the longer two are the power supply. When plugging and unplugging, the power is first ensured, and then the data exchange is performed to ensure that the hot plug does not damage the device data.

In addition to supporting hot plugging, HDMI interface connector devices can also support "plug and play" features, which greatly increases the popularity of HDMI devices. As a connector manufacturer, Guoguang Group shares the connector technology application of various interfaces.