Some netizens asked how to distinguish whether the HDMI cable is version 1.3 or 1.4. Xiaobian associates with many home theater network friends who have consulted home theater cables. (We have introduced common home theater cables before: "Common home theater signal lines Classification and connection use explanation") Speaker cable, HDMI and other related issues, so please answer in detail here.
1. What is HDMI?
HDMI, the high-definition multimedia interface. The interface provides up to 5 Gbps of data transmission bandwidth for uncompressed audio signals and high-resolution video signals. At the same time, it is not necessary to perform digital/analog or analog/digital conversion before signal transmission, which can ensure the highest quality video signal transmission.
2. What are the HDMI interfaces?
The HDMI interface can be divided into four types: Type A, Type B, Type C, and Type D. Type A is a standard 19-pin HDMI interface with the highest penetration rate; the B-type interface is slightly larger, but has 29 pins that provide dual TMDS transmission channels, thus supporting higher data rates and Dual-Link DVI connections. . The C-type interface and the A-type interface have the same performance, but the volume is smaller, which is more suitable for compact portable devices. Type D is the latest interface mode. Mainly applied to mobile phones and some tablets.
3. What are the benefits of HDMI?
The advantage is that only one HDMI cable is needed to transmit video signals at the same time, instead of requiring multiple wires to connect at the same time; at the same time, higher audio and video transmission can be achieved due to wireless digital/analog or analog/digital conversion. quality. For consumers, HDMI technology not only provides clear picture quality, but also greatly simplifies the installation of home theater systems due to the same cable for audio/video.
4. How much is the HDMI cable?
This mainly depends on the length of the copper core, the shielding material, the joint and the wire welder, the outer casing, the outer quilt and the wire. Generally, the same line, 3 meters or less will be cheaper, 3-10 price will be much more expensive, more than 10 meters more expensive, theoretically HDMI is up to 10 meters, more than 10 meters will have an amplifier, if there is no amplifier The loss of the line will be great, and the transmission quality will not be achieved.
5. How to tell if the HDMI cable is version 1.3 or version 1.4?
Compared with version 1.3, version 1.4 adds HDMI network channel, audio return channel, 3D Over HDMI, 4Kx2K resolution, extended support color space, and car connection system. The only way to tell if the HDMI cable is version 1.3 or version 1.4 is to look at the print on the line. HDMI 1.4 is High Speed ​​HDMI Cable with Ethernet, while HDMI 1.3 is High Speed ​​HDMI Cable. (When the English logo on the HDMI cable is the description of the above 2, 3, 4, 5, it is the 1.4 version of the HDMI cable; if it is marked with the above 1 logo, it is the 1.3 version of the HDMI cable)
The new features are explained in detail as follows:
1) Add HDMI network channel
The HDMI version 1.4 data line will add a data channel. It supports high-speed two-way communication. Interconnected devices that support this feature can send and receive data over 100 Mbps Internet to meet any IP-based application. The HDMI Ethernet channel will allow Internet-based HDMI devices to share Internet access with other HDMI devices without the need for an additional network cable. The new feature will also provide a connectivity platform that allows content to be shared between HDMI devices.
For the average consumer, the most direct benefit of this function is that the DVD player (Blu-ray player, etc.) equipped with HDMI1.4 interface, MP4, computer, TV and other products can be connected to each other through IP protocol. The network cable is connected through the current mainstream USB data cable. To a certain extent, the related equipment is more concise.
2) Add audio return channel
This channel reduces the number of cables required for audio to be transmitted up and processed and played. In the case of HDTV receiving audio and video content directly, this new channel allows HDTV to transmit audio directly to the A/V amplifier via the HDMI cable. There is no need for another cable on the receiver.
In other words, the audio signal of the TV can also be transmitted back to the AV amplifier. Instead of the audio signal of the digital TV as before, it can only be released through the speaker of the TV.
3) 3D Over HDMI
HDM11.4 will define a common 3D format and resolution for HDMI devices, standardizing the input and output parts of the home 3D system, and supporting up to two 1080p resolution video streams. In short, the HDM11.4 interface allows two 1080p full HD video signals to be transmitted simultaneously, laying the foundation for future 3D full HD display.
4) Support 4Kx2K resolution
HDMI 1.4 supports a maximum resolution of 4K x 2K (four times the current 1080p), and can transfer content at the same resolution as many digital home theaters, supporting 3840 x 21604Hz/25Hz/30Hz; 4096 x 2160 Ultra HD image transfer at 24Hz level.
5) Expand support color space
HDMI 1.4 will support color space designed for digital cameras, including sYCC601, Adobe RGB, and AdobeYCC601, which can display more accurate true colors when connected to a digital camera. The color of the still image transmitted by the digital camera can be made more precise.
6) Micro HDMI mini interface
HDMI 1.4 standardizes the Micro HDMI interface. It will be about 50% smaller than the current 19-pin common interface, providing up to 1080p resolution support for portable devices such as MP4 or GPS.
7) Automotive Con-nection System (ACS)
HDMI1.4 specifically incorporates cable specifications designed for in-vehicle HD content transmission, which can withstand the effects of common internal environment such as heat, vibration, and noise, providing a practical solution for automakers to deliver high-definition content in the car. .
In addition, the HDMI 1.4 version will include the following five types of wires:
· Standard HDMI cable: data transmission rate up to 1080i/60Hz
• High-speed HDMI cable: Beyond 1080p, including color depth and all 3D formats in the HDMI 1.4 specification.
Standard Ethernet HDMI cable: Supports network connections.
· High-speed Ethernet HDMI cable: Supports network connection.
· Automotive HDM I line: Used to connect external HDMI devices and car HDMI devices.
6, how to buy HDMI cable? See: "How to buy a home theater HDMI cable? 》.
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