HDMI digital video/audio interface technology

High Definition Multimedia Interface (English: High Definition Multimedia Interface, HDMI) is a digital audio / video interface technology, is a special type of digital interfaces for video transmission, which can transmit audio and video signals, the maximum data transfer rate of 5Gbps . At the same time without the signal before transmission / A or A / D conversion. HDMI can be used with broadband digital content protection (HDCP), to prevent copyrighted audio and video content from unauthorized copying. HDMI possess additional space can be used in future upgrades of audio and video formats. And because a 1080p video and an 8-channel audio signal needs less than 4Gbps, HDMI and therefore there is a great margin. This allows it to use a cable are connected to a DVD player, receiver and PRR.

HDMI 1080P resolution not only meet, but also support DVD Audio and other digital audio formats, support for eight-channel 96kHz or stereo 192kHz digital audio transmission, you can send uncompressed audio and video signals. HDMI can be used in set-top boxes, DVD players, personal computers, video games, integrated amplifier, digital audio and TV. HDMI can transmit audio and video signals simultaneously.

HDMI supports EDID, DDC2B, so the HDMI device has with the "plug and play" feature, automatically "consultations" between the signal source and the display device to automatically select the most appropriate video / audio formats.

Volume compared to DVI HDMI interface, smaller cable length HDMI / DVI optimum distance not more than 8 meters. Just one HDMI cable can replace up to 13 analog transmission line, a home entertainment system can effectively solve the messy tangle of wires behind the problem.


Advantages of using the HDMI video interface

HDMI advantages compared to existing analog video interfaces such as composite, S-Video and component video:

1, Quality: HDMI is a digital interface cable, since all analog connections (such as component video or S-video) requires no losses when converted from analog to digital, so it provides the best video quality. This difference in higher resolution, for example, is particularly evident when 1080p. Digital Video sharper than component video, eliminating the softness and smearing component video found. Such small, such as text, high-contrast detail will this difference to the limit.

2. Ease of use: HDMI integrate video and multi-channel audio in a single cable, eliminating the cost of the current A / V systems use multiple cables, complexity and confusion. This is especially useful when upgrading or adding equipment.

3, high intelligence: HDMI supports video source (such as a DVD player) and two-way communication between the DTV, enabling new functionality such as automatic configuration and one-touch play. By using HDMI, devices automatically transmitted to the monitor connected to the most efficient format? (Eg 480p vs 720p, 16: 9 vs 4: 3) eliminates the need to scroll all the formatting options for consumers to guess the best viewing format trouble.

4, high-definition content Ready: HDMI devices HDCP support can access the advanced high-definition content, we bring some comfort to me. HD-DVD and Blu-ray has to today's high-definition movie images boycott delayed start tag (also known as content protection flag) to help minimize the potential problems due to the result of the conversion, but is expected to start this mark in a few years , it means that the future of high-definition movies will not be able unprotected interfaces (such as analog components) to high-definition playback.

Advantages of using the HDMI Audio Interface

Through the existing audio interfaces such as analog RCA connectors and digital SPDIF (coaxial and optical connectors) to use the advantages of HDMI:

1, high quality: HDMI audio in pure digital form far transferred to the amplifier. Due to adjust the audio equipment and other electronic equipment to connect analog audio connection is more easily lost. With respect to the SPDIF connector, HDMI has more bandwidth, can be allowed to support the latest lossless audio formats such as Dolby TrueHD and DTS-HS Master Audio. These formats can not be supported through SPDIF connection, because they require the data rate is very high, exceeding the SPDIF capacity. See HDMI 1.3 section to learn more about Dolby TrueHD and DTS-HD Master Audio formats.

2. Ease of use: HDMI integrate video and multi-channel audio in a single cable, eliminating the cost of the current A / V systems use multiple cables, complexity and confusion. This is especially useful when upgrading or adding equipment.

3, high intelligence: HDMI supports two-way communication between the audio source (such as a DVD player) and adjust the audio device (such as A / V receivers) were to support features such as automatic configuration and one-touch play new features. By using HDMI, the device will automatically connect the A / V receiver is the most efficient transmission formats (such as Dolby Digital and 2-channel PCM), so that consumers do not need to scroll through all audio format options to guess what is the best and most support format.