Comprehensive analysis of the HDMI interface of the display

 HDMI (High Definition Multimedia Interface) is the first and only uncompressed all-digital audio/video interface supported in the industry. HDMI greatly simplifies wiring by transmitting high-definition, all-digital audio and video content in a single cable, providing consumers with the highest quality home theater experience. HDMI provides an interface between any audio/video source (such as a set-top box, DVD player, or A/V receiver) and an audio and/or video monitor (such as a digital TV DTV) in a single cable.

HDMI supports standard, enhanced or high-definition video and multi-channel digital audio on a single cable. It transmits all ATSC HDTV standards and supports 8-channel, 192kHz, uncompressed digital audio and existing compression formats (such as Dolby Digital and DTS). HDMI 1.3 also adds new lossless digital audio formats Dolby® TrueHD and DTS- With HD Master Audio™ support, spare bandwidth is used for future enhancements and requirements.

Quality: HDMI is a digital interface. Since all analog connections (such as component video or S-video) require no loss when converting from analog to digital, it can provide the best video quality. This difference is particularly noticeable at higher resolutions, such as 1080p. Digital video will be clearer than component video, eliminating the softness and smearing found in component video. Small, high-contrast details such as text take this difference to the extreme.
Ease of use: HDMI integrates video and multi-channel audio in a single cable, thereby eliminating the cost, complexity and confusion of multiple cables used in current A/V systems. This is especially useful when upgrading or adding equipment.
High intelligence: HDMI supports two-way communication between video sources (such as DVD players) and DTV, and realizes new functions such as automatic configuration and one-key playback. By using HDMI, the device automatically transmits the most efficient format (such as 480p vs 720p, 16:9 vs 4:3) for the connected display — eliminating the need for consumers to scroll through all format options to guess the best viewing format.
High-definition content ready: HDMI devices that support HDCP will be able to access advanced high-definition content now and in the future, which brings us some comfort. HD-DVD and Blu-ray have delayed the activation of the image boycott mark (also known as the content protection mark) for today's high-definition movies to help minimize potential problems caused by conversion, but it is expected that this mark will be activated within a few years , Which means that future high-definition movies will not be able to be played in high-definition through unprotected interfaces (such as analog components).
The core content consumers should pay attention to is that HDMI has been enabling a series of the latest technologies (such as DVD Audio, SACD, 1080p/60, etc.). However, in most cases, the choice of which functions to implement in a particular product is at the discretion of each manufacturer. Therefore, manufacturers can use their own understanding of the market to choose a combination of functions suitable for their customer base. Therefore, the customer must choose the device with the required functions (and should not focus on which version of HDMI the device implements.). Consumers who are interested in confirming whether a particular consumer electronic product supports DVD-Audio or other functions through HDMI can refer to the user manual and product reviews and directly consult the manufacturer.

Developed the HDMI Compliance Test Specification (CTS) 1.2a version, which includes the CEC appendix. HDMI CTS 1.2a has been updated to maintain technical consistency with HDMI Specification 1.2a and the recently released HDMI Specification 1.2. It is worth mentioning that CTS 1.2a includes additional cable and connector testing and Authorized Test Center (ATC) submission requirements. Specifically, under CTS 1.2a, if adopters use any new HDMI cable that exceeds the length of the previously tested cable, they should submit the new cable to ATC for testing.
In addition, HDMI Licensing, LLC will maintain a list of licensed connectors. In order for a device to pass ATC's CTS 1.2a test, all connectors on this device must appear on the list of approved connectors. To add a connector to this list, the manufacturer must submit a complete passing test result to ATC or HDMI Licensing, LLC
Although all previous HDMI versions have sufficient bandwidth to support all existing HDTV formats, HDMI 1.3 has increased its single link bandwidth to 340 MHz (10.2 Gbps) to support the needs of future HD display devices, such as higher resolution Rate, Deep Color and high frame rate. In addition, the establishment of the HDMI 1.3 specification is to allow future versions of HDMI to reach significantly higher speeds.

Deep Color: HDMI 1.3 supports 10-bit, 12-bit, and 16-bit (RGB or YCbCr) color depths, which can perfectly represent an unprecedentedly detailed picture of one billion colors. The color depth of the previous HDMI specification version is up to 8 bits.

Wider color space: HDMI 1.3 adds support for "xvColor™" (this is the name of the device describing the IEC 61966-2-4 xvYCC color standard), which removes the limitations of the existing color space and allows the human eye Watch any color display.
New mini interface: As small portable devices such as HD camcorders and digital cameras require the seamless connectivity of HDTV, HDMI 1.3 provides new and smaller interface options.

Lip synchronization: Because consumer electronic devices are using ever-increasing complexity of digital signal processing technology to enhance the clarity and detail of the screen content, it is a big challenge to synchronize the audio and video content in the user device, and it is potentially complicated. End user adjustments. HDMI 1.3 adds the function of automatic audio synchronization, so that the device can perform synchronization completely accurately and automatically.