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Black Box Explains…HDMI

The High-Definition Multimedia Interface (HDMI®) is the first digital interface to combine uncompressed high-definition video, up to eight channels of uncompressed digital audio, and intelligent format and command data in... more/see it nowa single cable. It is now the de facto standard for consumer electronics and high-definition video and is gaining ground in the PC world.

HDMI supports standard, enhanced, and high-definition video. It can carry video signals at resolutions beyond 1080p at 60 Hz (Full HD) up to 4K x 2K (4096 x 2160) as well as 3D TV.

HDMI also provides superior audio clarity. It supports multiple audio formats from standard stereo to multichannel surround sound.

HDMI offers an easy, standardized way to set up home theaters and AV equipment over one cable. Use it to connect audio/video equipment, such as DVD players, set-top boxes, and A/V receivers with an audio and/or video equipment, such as a digital TVs, PCs, cameras, and camcorders. It also supports multiple audio formats from standard stereo to multichannel surround sound. Plus it provides two-way communications between the video source and the digital TV, enabling simple remote, point-and-click configurations.

NOTE: HDMI also supports HDCP (High-bandwidth Digital Content Protection), which prevents the copying of digital audio and video content transmitted over HDMI able. If you have a device between the source and the display that supports HDMI but not HDCP, your transmission won't work, even over an HDMI cable.

HDMI offers significant benefits over older analog A/V connections. It's backward compatible with DVI equipment, such as PCs. TVs, and other electronic devices using the DVI standard. A DVI-to-HDMI adapter can be used without a loss of video quality. Because DVI only supports video signals, no audio, the DVI device simply ignores the extra audio data.

HDMI standards
The HDMI standard was introduced in December 2002. Since then, there have been a number of versions with increasing bandwidth and/or transmission capabilities.

With the introduction of HDMI (June 2006), more than doubled the bandwidth from 4.95 Gbps to 10.2 Gbps (340 MHz). It offers support for 16-bit color, increased refresh rates, and added support for 1440p WQXGA. It also added support for xvYCC color space and Dolby True HD and DTS-HD Master Audio standards. Plus it added features to automatically correct audio video synchronization. Finally, it added a mini connector.

HDMI 1.3a (November 2006), HDMI 1.3b (March 2007, HDMI 1.3b1 (November 2007), and 1.3c (August 2008) added termination recommendations, control commands, and other specification for testing, etc.

HDMI 1.4 (May 2009) increased the maximum resolution to 4Kx 2K (3840 x 2160 p/24/25/30 Hz). It added an HDMI Ethernet channel for a 100-Mbps connection between two HDMI devices. Other advancements include: an Audio Return Channel, stereoscopic 3D over HDMI (HDMI 1.3 devices will only support this for 1080i), an automotive connection system, and the micro HDMI connector.

HDMI 1.4a (March 2010) adds two additional 3D formats for broadcast content.

HDMI 2.0 (August 2013), which is backwards compatible with earlier versions of the HDMI specification, significantly increases bandwidth up to 18 Gbps and adds key enhancements to support market requirements for enhancing the consumer video and audio experience.

HDMI 2.0 also includes the following advanced features:

  • Resolutions up to 4K@50/60 (2160p), which is four times the clarity of 1080p/60 video resolution, for the ultimate video experience.
  • Up to 32 audio channels for a multi-dimensional immersive audio experience.
  • Up to 1536Hz audio sample frequency for the highest audio fidelity.
  • Simultaneous delivery of dual video streams to multiple users on the same screen.
  • Simultaneous delivery of multi-stream audio to multiple users (up to four).
  • Support for the wide angle theatrical 21:9 video aspect ratio.
  • Dynamic synchronization of video and audio streams.
  • CEC extensions provide more expanded command and control of consumer electronics devices through a single control point.

  • HDMI Cables
  • Standard HDMI Cable: 1080i and 720p
  • Standard HDMI Cable with Ethernet
  • Automotive HDMI Cable
  • High Speed HDMI Cable: 1080p, 4K, 3D and Deep Color
  • High Speed HDMI Cable with Ethernet

  • HDMI connectors
    There are four HDMI connector types.
    Type A: 19 pins. It supports all SDTV, EDTV, and HDTV modes. It is electrically compatible with single-link DVI-D. HDMI 1.0 specification.

    Type B: 29 pins. Offers double the video bandwidth of Type A. Use for very high-resolution displays such as WQUXGA. It's electronically compatible with dual-link DVI-D. HDMI 1.0 specification.

    Type C Mini: 19 pins. This mini connector is intended for portable devices. It is smaller than Type A but has the same pin configuration and can be connected to Type A cable via an adapter or adapter cable. Type C is defined in HDMI 1.3.

    Type D Micro: 19 pins. This also has the 19-pin configuration of Type A but is about the size of a micro-USB connector. Type D is defined in HDMI 1.4.

    HDMI cable
    Recently, HDMI Licensing, LLC announced that all able would be tested as either Standard or High-Speed cables. Referring to cables based on HDMI standard (e.g. 1.2, 1.3 etc.) is no longer allowed.

    Standard HDMI cable is designed for use with digital broadcast TV, cable TV, satellites TV, Blu-ray, and upscale DVD payers to reliably transmit up to 1080i or 720p video (or the equivalent of 75 MHz or up to 2.25 Gbps).

    High-Speed HDMI reliably transmits video resolutions of 1080p and beyond, including advanced display technologies such as 4K, 3D, and Deep Color. High-Speed HDMI is the recommended cable for 1080p video. It will perform at speeds of 600 MHz or up to 18 Gbps, the highest bandwidth urgently available over an HDMI cable.

    HDCP copy protection
    HDMI also supports High-bandwidth Digital Content Protection (HDCP), which prevents the copying of content transmitted over HDMI cable. If you have a device between the source and the display that supports HDMI but not HDCP, your transmission won’t work, even over an HDMI cable. Additional resources and licensing information is available at HDMI.org.

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    Planning a digital signage system.

    How to plan a digital signage project. Considering the many available digital signage solutions might seem like an overwhelming task. But taking some time to research and understand your options will... more/see it nowbe well worth the investment for your institution. Follow these key steps: 1. You need to understand and articulate the objective at the start. Clearly define the goals and determine how you will measure and analyze against the goals. Determine what information you want to communicate and for what purpose. You may want it to give you one or more of the following: • Sales uplift. • Brand messaging. • Entertainment for waiting customers. • Better internal communications. • Public messaging. • Third-party advertising. It is not only imperative to understand what you want the signage to accomplish but also how it will be evaluated. In short, “How will the success or failure of the system be judged and by whom?” What metrics of judgment will be used: ROI, ROO, or other qualifiers? 2. Clearly define the content: The success of any digital signage system starts, of course, with the content. It must look fresh, exciting, and professional. Who will create it and how will it be presented? Do you have internal resources and expertise, or will you need to outsource content creation? A good source of creative and editorial help can be found in aspiring graphic designers culled from the student ranks, in addition to your school’s art department, yearbook and newspaper staffs, and TV studio (if you have one). 3. Invest the time to understand your options: Once you’ve decided on content, you need to consider the infrastructure that will deliver it and study your display options: LCD vs. plasma? RSS feeds? Live video? Remote management? Playback verification? The options will seem limitless, so taking time to sort through them is imperative. 4. Involve all the appropriate stakeholders: The communications/information department should be involved at the start, considering that your digital signage will likely be used for external community relations. If it‘s a K–12 application, you’ll need to include not only your district’s superintendent, principals, purchasing personnel, and IT staff, but also quite possibly instructional technology and AV staff, as well as maintenance, curriculum, athletic, and cafeteria directors. 5. Figure out how you’re going to pay for it: Digital signage is often viewed by some as a luxury item? —? particularly in the face of shrinking school budgets. But because it can also be used as a tool for emergency communications and notification, administrators can easily make the case that digital signage is a must-have component of any crisis plan — especially in this day and age when school violence incidents capture news headlines. Consider government sources of funding for your digital notification system (federal funds are available from the U.S. Department of Homeland Security for pre-disaster mitigation and preparedness, as well as the U.S. Department of Justice, for instance). Whether it’s earmarked entirely as an IT expenditure or apportioned across multiple departments in your budget, you need a spending roadmap in addition to a developmental one. The hardest part with this may be determining the total cost of ownership over the life of the system, including any nickling-and-diming with ongoing licenses and upgrades. College administrators, however, can easily make the case from a cost-savings perspective. Having to constantly update traditional signage across a campus can be quite costly. Paper signage is expensive to print and replace regularly. With digital signage, no printed material is necessary, so both time and cost savings can be made, and the environmental impact is minimized. 6. Decide how to implement the solution: Based on your deployment size and scope, decide if you can implement it in-house or if you need the help of a professional integrator. A number of “out-of-the box” systems can be set up with relative ease. But the more dynamic and complex the system, the more complicated the implementation and ongoing management? — ?and the more likely you’ll need outside help. collapse

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