Language

BLOG

Company News

Industry News

Public Notice

Technical Analysis of Two HDMI Connector Types

Release time：

2022-09-07

The S50 in‑vehicle smart display features a detachable, modular camera system and supports three cameras for versatile scene‑specific recording. The driving camera delivers 3K ultra‑wide‑angle video capture at up to 2880×1620 resolution, with a 140° field of view that covers multiple lanes for more comprehensive recording. Additionally, the device is equipped with 32GB of built-in eMMC storage, offering faster, more stable read/write performance and eliminating concerns about memory card compatibility. A new guest‑mode password‑protected recording feature further safeguards your privacy, even when the vehicle is shared with others.

　　HDMI connectors are now widely used, particularly amid the current market trend toward integrated internet‑enabled TVs and ecosystem‑driven home‑appliance ecosystems. According to Guoguang Group, HDMI is employed in high-definition set-top boxes, DVD players, personal computers, video game consoles, AV receivers, digital audio systems, and televisions. HDMI connectors come in three types: Type A, Type B, and Type C. Each type consists of a receptacle on the device side and a plug on the cable side.

　　1. Can an HDMI connector simultaneously transmit both audio and video signals?

　　According to some online resources, HDMI connectors are convenient to use—audio and video can be transmitted through a single cable. But is this claim actually true?

　　Our investigation of user feedback reveals that many beginners to HDMI interfaces assume that “HDMI‑to‑HD” means it can transmit both audio and video simultaneously. However, after bringing an LCD TV home and connecting it to a computer via HDMI, they often find that no sound is output.

　　So why is that?

　　Guoguang Group—Analysis of HDMI Connector Manufacturers: Currently, most computers handle audio and video signals separately, with each outputting independently. Video signals are routed from the graphics card or the motherboard’s integrated graphics, while audio must be output via the sound card or the motherboard’s integrated audio chip. Consequently, even if a graphics card is equipped with an HDMI or DVI port, it can transmit only video—audio remains untransmitted. To enjoy synchronized audio, users must route the audio signal separately.

　　When shopping for an LCD TV and planning to connect a computer via HDMI or DVI, be sure to check whether the model includes a dedicated audio input port for HDMI. If not, you’ll need to set up external speakers to handle your computer’s audio output.

　　II. Is it true that you should not hot-plug HDMI connector cables?

　　Guoguang Group has learned that some sources claim it supports hot-swapping, while others say it does not. Below, we’ll explain this from several technical perspectives:

　　Principle behind HDMI connector support for hot-plugging:

　　At pin 19 of the HDMI female connector, a half‑length pin is installed, known as the Hot Plug Detect pin. When an HDMI cable is disconnected, this Hot Plug Detect pin is the first to lose its connection. Upon detecting this disconnection, the HDMI circuitry notifies the input and output devices to cease operation, thereby enabling hot plugging. This principle relies on the differing lengths of the interface pins, which is somewhat analogous to USB hot plugging. Inside a USB connector, there are four gold contacts: the two longer ones provide power, ensuring that power remains connected during insertion and removal, while the remaining contacts handle data transfer, thus preventing data loss or device damage during hot plugging.

　　HDMI connector devices not only support hot-plugging but also feature “plug-and-play” functionality, which has significantly broadened the adoption and usability of HDMI equipment. As a connector manufacturer, Guoguang Group shares its expertise in the application of connector technologies across various interfaces.

Shenzhen Linkconn Electronics Co., Ltd.

Tel：86-755-82943323
Fax：86-755-82966567
E-Mail：szlcn@linkconn.com
Add：15/F, Block E, China Resources Land Building, Hi-Tech Park, Nanshan District, Shenzhen, China