HDMI supports standard, enhanced or high definition video and multichannel 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 non-destructive digital audio formats to Dolby® TrueHD and DTS- Supported by HD Master AudioTM, free bandwidth for future enhancements and needs.
HDMI founders include leading consumer electronics manufacturers Hitachi, Matsushita Electric Industrial (Panasonic), Philips, Sony, Thomson (RCA), Toshiba and Silicon Image. In addition, HDMI supports major movie producers Fox, Universal, Warner Bros. and Disney, as well as system operators DirecTV, EchoStar (Dish Network) and CableLabs. Hdmi.jpg (13.14 KB)
2009-11-12 09:41 AM
HDMI advantages
Quality: HDMI is a digital interface that provides the best video quality because all analog connections (such as component video or S-video) require no loss when converting from analog to digital. This difference is especially noticeable at higher resolutions, such as 1080p. Digital video will be sharper than component video, eliminating the softness and smearing found in component video. Tiny, high-contrast details such as text take this difference to the limit.
Ease of Use: HDMI integrates video and multi-channel audio in a single cable, eliminating the cost, complexity and confusion of the multiple cables used in current A/V systems. This is especially useful when upgrading or adding devices.
High intelligence: HDMI supports two-way communication between video sources (such as DVD players) and DTV, enabling new features such as auto-configuration and one-touch playback. By using HDMI, the device automatically transmits the most efficient format for connected displays (eg 480p vs 720p, 16:9 vs 4:3) - eliminating the need for consumers to scroll through all formatting options to guess the best viewing format.
High-definition content ready: HDMI devices that support HDCP will now be able to access advanced high-definition content, giving me some comfort. HD-DVD and Blu-ray have delayed launch image rejection tags (also known as content protection tags) for today's high-definition movies to help minimize potential problems due to conversions, but are expected to launch this tag within a few years This means that future high-definition movies will not be able to play in high definition through unprotected interfaces such as analog components.
HDMI logo usage specification
The core content consumers should pay attention to is that HDMI has been using a range of the latest technologies (such as DVD Audio, SACD, 1080p/60, etc.). However, in most cases, it is up to each manufacturer to decide which features to implement in a particular product. As a result, manufacturers can choose the right combination of features for their customer base through their own understanding of market conditions. Therefore, customers must choose the device with the features they need (rather than focusing on which version of HDMI the device implements). Consumers interested in confirming whether a particular consumer electronics product supports DVD-Audio or other features via HDMI can consult the user manual and product reviews and consult the manufacturer directly.
Deep Color
Supports Deep Color
Supports Deep Color over HDMI
HDMI (V.1.3 with Deep Color)
HDMI (Deep Color)
HDMI (V.1.3 with Deep Color, xvColor)
HDMI (Deep Color, xvColor)
HDMI version development
The HDMI 1.0 specification was released in December 2002.
HDMI 1.1 was released in May 2004.
The HDMI 1.2 specification was released in August 2005.
The HDMI 1.2a specification was released in December 2005.
The HDMI 1.3 specification was released in June 2006.
HDMI 1.1
Support for DVD Audio
HDMI 1.2
Added features and features that help drive HDMI to be used in both CE and PC industries. Specifically, the features and improvements of HDMI 1.2 include support for one audio format, such as DSD (Direct Streaming Digital) for SuperAudio CD.
Improvements that provide better support for current and future PCs with HDMI output, including:
Widely used HDMI Class A connector for PC sources and displays that fully support PC video formats
The PC source supports the YCbCr CE color space while using its native RGB color space. HDMI 1.2 and higher displays are required to support future low voltage (ie, AC-coupled) power supplies, such as those based on PCI Express I/O technology.
HDMI 1.2a
Comprehensive provisions for consumer electronic control (CEC) functions and command sets and CEC compatibility testing.
The HDMI Compatibility Test Specification (CTS) version 1.2a was developed, including the CEC Addendum. HDMI CTS 1.2a has been updated to be technically consistent 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 Test and Authorization Test Center (ATC) submission requirements. Specifically, under CTS 1.2a, the adopter is using any new HDMI cable that is longer than the previous test cable length and should be submitted to ATC for testing.
In addition, HDMI Licensing, LLC will maintain a list of licensed connectors. In order for the device to pass the CTS 1.2a test of ATC, all connectors on this device must appear on the list of licensed connectors. To add a connector to this list, the manufacturer must submit a complete pass test result to ATC or HDMI Licensing, LLC
HDMI 1.3
Faster: While all previous HDMI versions already have enough bandwidth to support all existing HDTV formats, HDMI 1.3 increases its single-link bandwidth to 340 MHz (10.2 Gbps) to support future HD display devices, such as Higher resolution, Deep Color, and high frame rate. In addition, the HDMI 1.3 specification is set to make the speed of the future HDMI version significantly faster.
Deep Color: HDMI 1.3 supports 10-bit, 12-bit and 16-bit (RGB or YCbCr) color depths for an unprecedentedly detailed picture of one billion colors, compared to the previous HDMI specification version with a color depth of up to 8 bits.
Wider color space: HDMI 1.3 adds support for “xvColorTMâ€, a device name that describes the IEC 61966-2-4 xvYCC color standard, which removes the limitations of existing color spaces and makes it visible to the human eye. Display of any color. Welcome to Home Theater Network
New Mini Interface: HDMI 1.3 offers new, smaller interface options as small portable devices such as HD camcorders and digital cameras require seamless HDTV connectivity.
Lip Synchronization: Because consumer electronics devices are using increasingly sophisticated digital signal processing techniques to enhance the clarity and detail of picture content, synchronizing audio and video content in user devices is a major challenge that potentially requires complexity. End user adjustment. HDMI 1.3 adds automatic audio synchronization to enable the device to perform synchronization completely accurately and automatically.
New HD lossless audio format: In addition to the existing capabilities of HDMI to support high-bandwidth uncompressed digital audio and all existing compression formats such as Dolby Digital and DTS, HDMI 1.3 also adds a new lossless compressed digital audio format to Dolby TrueHD and DTS-HD Master Audio support.
HDMI1.4
The latest HDMI specification version 1.4 includes two-way high-speed network transmission, audio backhaul and support for 3D display, and the support resolution has been increased to 4Kx2K. According to Steve Venuti, president of HDMI Licensing, LLC., there are currently 850 authorized adopters worldwide. It is expected that HDMI interfaces will be installed on 1 billion devices by 2009. And by the end of 2009, 100% of digital TV will be implemented using HDMI. Then, in 2010, Blu-ray players, 2012 DVD players will achieve 100% installation of the HDMI interface. See Xiaozhi, HDMI application prospects and market will be extremely broad.
According to reports, the latest version of 1.4 of the HDMI specification provides the following new features:
. HDMI Ethernet channel
The HDMI specification 1.4 adds a data path to the cable for bidirectional high-speed transmission. Devices with this function will be able to send and receive data at an Ethernet line speed of 100 Mb/s after connection, and make these devices immediately become IP-based devices.
The HDMI Ethernet channel allows Internet-enabled HDMI devices to share their Internet connection with other HDMI devices without the need for additional Ethernet cables. This new feature also provides the interconnect architecture required to share content between HDMI devices.
An audio channel has been added to the latest specifications of the audio return channel to reduce the number of cables required to process and replay the uploaded audio. When the HDTV directly receives audio and video content, this new audio return channel allows the HDTV to directly transmit audio streams to the A/V receiver without adding additional cables.
The HDMI 3D feature specification version 1.4 defines a common 3D format and resolution for HDMI devices. This specification standardizes the input/output portion of a home 3D system with a specification resolution of up to dual channel 1080p.
Support for 4K x 2K resolution The latest specifications allow HDMI devices to support HD resolutions four times faster than 1080p resolution. The new specification supports 4K x 2K resolution, allowing the HDMI interface to be transmitted with the same standard resolution content used by many digital cinemas.
. Extended support for color space
HDMI technology now supports color spaces designed for digital cameras. The HDMI-enabled display device can display more accurate and realistic colors when connected to a digital camera after supporting sYCC601, Adobe RGB, and Adobe YCC601.
"As consumer electronics and PC manufacturers design products that enhance the consumer's high-definition experience, the HDMI specification will continue to add new features," said Steve Venuti, president of HDMI Licensing, LLC. The 1.4 specification supports Ethernet. Connected with 3D formats and other recent exciting and powerful innovations, in addition, we offer more solutions, including smaller connectors for portable devices, and connection systems designed specifically for cars. It is because we have observed that more and more different devices use HDMI technology. With the introduction of new specifications, several new HDMI cables and new HDMI 1.4 devices will be available simultaneously.
HDMI new Deep Color
Deep Color has enabled HDTV and other display devices to evolve from millions of colors to hundreds of millions of colors, allowing consumers to enjoy the unprecedented realism and precision of display colors on display devices. Deep Color eliminates the ribbon on the screen, making the pitch transitions smoother and the gradient between colors more subtle. It increases the contrast ratio and shows more gray shades between black and white.
The new Deep Color performance allows manufacturers to create devices that let consumers enjoy hundreds of millions of colors, incredible visual clarity and detail. HDMI 1.3 supports 10-bit, 12-bit, and 16-bit RGB color depth and color space, which is a big improvement over previous versions of the HDMI specification that support up to 8-bit resolution.
xvColorTM or xvYCC
HDMI 1.3 uses the IEC 61966-2-4 color standard, commonly referred to as xvYCC (short form for video application extension YCC colorimetric method) under the trademark "xvColorTM". This new standard is 1.8 times the color of existing HDTV signals. xvColor makes HDTV display colors more precise, making color display more natural and realistic.
HDMI backward compatible with DVI (Digital Visual Interface)
HDMI is fully backward compatible with DVI compatible devices. The HDMI DTV will display video from an existing DVI-equipped product, and a DVI-equipped TV will display video from an HDMI source. However, some older PCs with DVI are only designed to support computer monitors, not televisions. Consumers who purchase PCs (with DVI) should ensure that they explicitly support the TV format, not just computer monitors. At the same time, consumers must also ensure that the DVI interface supports High-Bandwidth Digital Content Protection (HDCP), because HDCP-protected content requires HDCP for HDMI and DVI devices to properly view video content.
HDMI has been supporting 1080p resolution since version 1.0 of 2002. However, as with many HDMI-enabled features (such as DVD-Audio and SACD), manufacturers can choose whether or not to implement 1080p on their devices. Some TV and device manufacturers choose not to implement 1080p on their products because 1080p content applications are not widely available, and supporting 1080p by replacing internal components will increase costs. Watching 1080p resolution requires at least HDTV with a display that supports 1080p pixel resolution. Today, many HDTVs still use display technologies designed for 720p pixel resolution (such as PDP, LCD, and microdisplay screens).
In addition, some 1080p HDTVs today only support 720p or 1080i for HDMI input, and then perform video processing to convert 720p/1080i signals to 1080p. Now that everything is changing, as 1080p content is getting more and more, HDTV and HDMI electronics that fully support 1080p display have become more popular in early 2006.
All versions of HDMI are backward compatible. Consumers should not only pay attention to the specific version of HDMI, but pay attention to what features they need to support the device (SACD, 1080p, etc.).
From the beginning, HDMI was defined as transmitting 192 kHz, 24-bit uncompressed 8-channel audio, which is beyond all current consumer media formats. In addition, HDMI can also transmit currently popular compressed audio formats such as Dolby (including Dolby Digital EX 7.1, Dolby Digital Plus 7.1, Dolby TrueHD) or DTS (including DTS-ES 6.1 and DTS-HD Master Audio). In these compression formats, early S/PDIF or AES/EBU interfaces can only transmit multi-channel or high-definition audio formats. HDMI 1.3 adds a new lossless digital surround sound audio format, Dolby TrueHD and DTS-HD Master Audio. In addition, most existing HDMI sources can output any compressed audio stream, while new sources can output uncompressed 6-channel, 96kHz audio from a DVD-Audio disk. A/V receivers on the market can receive and process 6 or 8 channel audio via HDMI.
Welcome to Home Theater Network
Differences between analog transmission, SPDIF transmission and HDMI transmission
HDMI provides the best quality because it supports full lossless Dolby TrueHD audio data that is digitally transmitted to the A/V receiver and enables the A/V receiver to apply its full digital audio processing capabilities (such as bass management) Or sound field processing effects) to further enhance the audio quality.
SPDIF does not have the ability to support the data rate required by Dolby TrueHD and will therefore not be supported.
The analog is worse than HDMI for two reasons: 1) the analog transmission itself is lossy and will degrade when passing over the cable, 2) many A/V receivers do not apply any digital audio processing to the analog input. And in such cases, the analog signal will be sent directly to the amplifier without processing.
Optoelectronic Information Series
Photoelectric information series laboratory related equipment
Optoelectronic Information Product,Optical Bench Experiments Physics,Optical Devices Physics,Optical Physics Properties
Yuheng Optics Co., Ltd.(Changchun) , https://www.yuhengcoder.com