Archive | AV RSS for this section

HDMI 2.0 officially announced: 18Gbps bandwidth, 60fps 4K, 32 channel audio

hdmi

HDMI Forum, Inc., a non-profit, mutual benefit corporation, today announced the release of Version 2.0 of the HDMI Specification. This latest HDMI Specification, the first to be developed by the HDMI Forum, offers a significant increase in bandwidth up to 18Gbps to support new features such as 4K@50/60 2160p, which is 4 times the clarity of 1080p/60 video resolution; 32 audio channels; as well as dynamic auto lip-sync and extensions to CEC.

via HDMI 2.0 officially announced: 18Gbps bandwidth, 60fps 4K, 32 channel audio.

Amar Bose, Acoustic Engineer and Inventor, Dies at 83

bose

Amar G. Bose, the visionary engineer, inventor and billionaire entrepreneur whose namesake company, the Bose Corporation, became synonymous with high-quality audio systems and speakers for home users, auditoriums and automobiles, died on Friday at his home in Wayland, Mass. He was 83.

His death was confirmed by his son, Dr. Vanu G. Bose.

As founder and chairman of the privately held company, Dr. Bose focused relentlessly on acoustic engineering innovation. His speakers, though expensive, earned a reputation for bringing concert-hall-quality audio into the home.

And by refusing to offer stock to the public, Dr. Bose was able to pursue risky long-term research, such as noise-canceling headphones and an innovative suspension system for cars, without the pressures of quarterly earnings announcements.

In a 2004 interview in Popular Science magazine, he said: “I would have been fired a hundred times at a company run by M.B.A.’s. But I never went into business to make money. I went into business so that I could do interesting things that hadn’t been done before.”

via Amar G. Bose, Acoustic Engineer and Inventor, Dies at 83 – NYTimes.com.

The History of the Aspect Ratio

Kind of long, but it takes you through 4:3, 2.35:1, and 16:9.

InfoComm Makes CTS Exam Revisions

InfoComm Makes CTS Exam Revisions

The new CTS exam folds “market A/V technologies” and “evaluate A/V personnel competencies” into a single task called: “perform AV finance and job-costing activities.” The CTS-D exam includes network design and configuration, system security, expanded content on digital video signals, digital content management, smart building technologies, and energy efficient design. The CTS-I test targets network setup and configuration, and wireless connectivity, including RF microphones and 802.11 microphones and 802.11 networks.

via InfoComm Makes CTS Exam Revisions.

Birmingham Airport Sign Collapse

Click through for this long-form article about the events leading up to the installation of an airport video display that collapsed and killed a 10 year old boy. For those of us in the design/engineering profession, it is always important to thoroughly check and comment on shop drawings that come through.

airport-sign-collapse-evolution-of-a-tragedyjpg-bcb480f9fd6a0b02

Fish used the architect’s design drawings to create the shop drawings. Shop drawings obtained through the records request show that they were completed Aug. 15, 2012. An employee of Brasfield & Gorrie approved the drawings on Aug. 17, 2012, and an architect with KPS approved them on Aug. 19, 2012.

In a change from earlier designs, the Fish shop drawings called for MDF to be used for the front of the display. Instead of a three-quarter-inch sheet of MDF as the core of the display panel’s front, the new design used three layers which together were 1.75 inches thick.

The change as drawn added more weight to the front. Some of the heaviest materials in the display were now to hang over open space.

via Birmingham airport sign collapse: The making of a tragedy | al.com.

72 MHz or 216 MHz for Assisted Listening Devices


72 – 75 MHz vs. 216 MHz

Each frequency band has different advantages over the other. Consider the following questions to help determine the right frequency for your particular application:

  1. Do I have a very long range that needs to be covered?
  2. Is distance of transmission a top priority?
  3. Is there a need to use more than (3) three frequencies simultaneously?
  4. Is audio quality a main concern?
  5. If using an external antenna, what is the clearance space with the ceiling?
  6. Is the transmission going to be used primarily outdoors?
  7. What length of cable will be used from the transmitter to the antenna?
  8. Which frequency is less likely to have interference with other signals?

Answering these questions will give you a better idea of which frequency will best suit your application. Here are a few facts and details about the two frequencies:

Transmission Range

The transmission range doubles when using the 216 MHz frequency band. Using a dipole antenna (more efficient) the 72 MHz frequency has a transmission range of 1,500 ft. (457 m). With the same scenario 216 MHz will broadcast up to 3,000 ft. (914 m) line of site. In portable applications, using the LT-700 Portable Display FM Transmitter, the range is the same with both frequencies – 150 ft (45.7 m).

Simultaneous Channels

Because the 72 MHz band is larger, up to (6) six channels can be used simultaneously, while only (3) three channels can be used concurrently with the 216 MHz band.

via Blog – Should I Use 72 MHz or 216 MHz? – Listen Technologies.

Good info I needed today while working on an AV specification.