Peggy Dunn Telecom Systems

Port Digital
Bench Digital Multimeters feature USB to RS232 adapter.
Fluke 8808A 5.5-digit Digital Multimeter and 8845A/8846A 6.5-digit multimeters include cable adapter which converts RS-232 serial port to USB, allowing connection of device to PC USB port. Units also include FlukeView Forms Basic software that allows users to document, store, and analyze individual readings or series of measurements, then convert them into professional documents. Program can be ...

What is HDMI?

HDMI, or High-Definition Multimedia Interface, is the first and only industry-supported, all-digital audio/video interface for transmitting uncompressed digital data. As an alternative to consumer analog standards, HDMI connects digital audio/video sources—such as PCs, Blu-ray Disc players, AV receivers, video games consoles, and video boxes—to compatible devices. On a single cable, HDMI supports any PC or TV video format with up to 8 channels of crystal-clear digital audio.

Today, more than 700 companies in the consumer electronic department have adopted and implemented new versions of the HDMI specifications.

Benefits

Image Quality: Compared to other connections, HDMI can deliver the best image quality that's available today. It can handle high-definition video of up to 1080p resolution at 60 frames per second, which is the most bandwidth-intensive video format currently available on the market.

Audio Quality: In addition to superior image quality, HMDI can easily handle even the highest resolution audio soundtracks, including Dolby TrueHD and DTS-HD Master Audio. It supports up to eight channels of 24-bit audio at 192kHz. The only other connection type that can deliver the same quality are multichannel analog audio cables, but you'd need to run as many as eight separate cables just to get the same quality.

Intelligence: Adding more intelligence to a home entertainment system makes it more efficient and easier to use. Using HDMI enables new functionality, such as one-touch play and automatic configuration. One-touch play allows users to turn on all the devices necessary for playback with the touch of a single button.

Ease of Use: HDMI can do in one cable what could otherwise take several cables. Ultimately, HDMI eliminates the cost, clutter, and complexity of multiple wires. These features are particularly beneficial when upgrading or adding equipment.

HDMI & Entertainment Systems

The most tangible way HDMI affects the way we interface with our components is in the set-up. Because one HDMI cable can replace several analog cables, the process of setting up home theatre systems is highly simplified. Because of the two-way communication capabilities, components that are connected via HDMI constantly talk to each other in the background, so that content is sent in the best format without much user intervention.

HDMI Cables

Whereas the standard DVI cables were originally developed for PC use, HDMI cables were developed specifically for consumer electronic products, such as DVD players and digital televisions. Manufacturers have started producing both standard and high-speed HDMI cables. Standard cables typically perform at speeds of 75Mhz, while high-speed cables typically perform at speeds of 340MHz. The HDMI standard cables also include two other important channels: CEC (Consumer Electronics Control Channel) and DDC (Display Data Channel).

CEC functionality utilizes HDMI's two-way communication to allow for single remote control, such as the One-Touch Play we mentioned earlier. Because CEC is an optional feature, consumers must look for it in the product feature list.

HDMI technology has been engineered to use standard copper cable construction at long lengths. However, signal strength tends to deteriorate over long cable runs. The recommended maximum cable length is approximately 33 feet.

Tips

Keep in mind that if you are connecting a DVI-enabled device that does not support HDCP, then connecting your DVI gear to an HDMI port will force the HDMI-enabled device to downgrade high definition video content to standard resolution.

When buying HDMI cables, price doesn't need to be a factor in your decision. In general, a $10 cable is likely to perform just as well as its $50 counterpart.

HDMI cables can come with two kinds of connectors: a compact Type-A 19 pin connector, and a slightly larger 29-pin Type-B HDMI connector. This second connector enables the use of dual-link HDMI configuration, which doubles the maximum transfer rate.

The later versions of HDMI technology include support for One-Bit Audio format used in SuperAudio CDs (SACD) Direct Stream Digital.

FAQs

How much bandwidth do you need? The bandwidth required for a given resolution is governed by the refresh rate and blanking interval of the monitor. The following formula can be used to calculate the specific bandwidth:

Bandwidth = Resolution x Refresh Rate x [1+ Blanking Period] in Bps

(Where the Blanking Period is the sum of the horizontal and vertical blanking intervals)

As an example, let's consider the highest HDTV standard defined today: 1080p 60Hz HDTV video signal with a 16% overall blanking interval. This means that the required bandwidth is equal to 1920 x 1080 x 60 x [1 + .16] = 144.4MHz or 144.4 million pixels/sec.

Are all of the new HDMI versions backward compatible with previous versions? Yes, all HDMI versions are fully backward compatible with previous versions, including DVI compliant devices.

Can I upgrade my existing HDMI version? As of now, it is not possible to perform an upgrade. If such conversions were made possible in the future, it would come directly from the manufacturer.

For a wide range of inexpensive, high-quality HDMI cables, check out Superwarehouse.com

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