AVGlossary.com updated

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AVGlossary.com: The World’s Largest Audio, Video, and Photography Glossary

Thanks to my good friend Karen, the entries for AVGlossary.com have all be entered as individual posts. I’m in the process of tweaking the search engine to call up the best terms at the top of the search results so for now you are best to look under “Pages” on the right and find your term that way.

If you have yet to visit AVGlossary.com, check it out! Here is a brief sampling of some of the 500+ definitions I have there. If you can’t find your term, send me an email and I will add it!

20-20,000 Hz: Humans are able to hear audio frequencies between 20 Hz (low bass) and 20,000 Hz (very high treble). Hearing ability decreases with age. Men hear low frequencies better than women, and women hear high frequencies better than men. Sounds above 20,000 Hz cannot be perceived, but frequencies below 20 Hz can be felt, though not heard.

35mm Equivalent: Refers to a digital camera’s equivalent 35mm focal length. Focal lengths of 20-24 mm= very wide angle, 25-28 mm= wide angle, 29-35 mm= moderate wide angle, 36-60 mm= normal, 70-135mm= telephoto, 150-200= strong telephoto, over 200mm= super telephoto. See Wide Angle, Telephoto.

1080p/24: 1080 progressively-scanned lines of resolution at 24 frames per second (fps.) Most Blu-ray Discs and HD DVDs are recorded at 1080p/24fps, the theoretical best as it exactly duplicates the native rate of the filming. Playing back such material on a player that outputs 1080p/24 to a TV that supports 1080p/24 with a 1080p/24 input will theoretically yield the best possible picture quality and the most film-like reproduction of the material possible. See Native.

Acoustic Suspension: A loudspeaker using a sealed enclosure, rather than a ported one. Acoustic suspension speakers are favored for their tight, precise sound and accurate, low distortion bass reproduction, but they typically require more power and do not produce as much bass as ported designs. The first acoustic suspension speaker, the Acoustic Research AR-1, was introduced in 1956 by Edgar Villchur and Henry Kloss and is considered a landmark audio achievement. See Ported Speaker.

Blu-ray Profile 1.1: Blu-ray Profile 1.1 players and discs support “Bonus View” picture-in-picture capabilities for viewing content such as storyboards, director and actor commentary, and looks behind the scenes showing how the movie was made. Local storage capacity of 256 MB is also required. All Blu-ray players introduced after November 1, 2007 must conform to Profile 1.1 at a minumum. Profile 1.1 is also called “Final Standard Profile.” With the exception of the Sony Playstation 3, Profile 1.1 players cannot be upgraded to Profile 2.0 as they lack necessary hardware (an internet connection.)

Buffer: Temporary memory in a digital camera. When a picture is taken, the information first goes to the buffer, then is transferred from the buffer to the memory card. After the picture is transferred to the memory card the buffer is cleared to make room for more pictures. The size of the buffer and the speed of the camera’s electronics determine how many pictures can be taken before the buffer is filled. When the buffer is full, the user must wait until it space is cleared before taking another picture.

Burr-Brown: Burr-Brown is a manufacturer of digital-to-analog converters (DACs.) Burr-Brown DACs are known for superior sound quality, so manufacturers using them in their components will often state “Burr-Brown DACs” as a selling point, assuring the customer of superior audio quality. Burr-Brown is a Texas Instruments company. See DAC.

HQV: Hollywood Quality Video, video processing technology from Silicon Optix. HQV is regarded as some of the very finest quality video processing available and is used in the professional market as well as consumer applications. The two consumer-grade offerings are HQV Reon and HQV Realta, with Realta the higher-end offering where it competes with Gennum VXP. Both HQV Reon and HQV Realta are found in premium-grade DVD players, HD DVD players, Blu-ray Disc players, televisions, and video projectors. See Video Processor, VXP.

Ported Speaker: Speaker incorporating a strategically placed, tuned opening (port) in the cabinet. Ported speakers harness acoustical energy generated by the back of the speaker drivers and the speaker cabinet and use it to enhance bass response and improve speaker sensitivity. See Acoustic Suspension, Sensitivity.

Scaling: Resizing of a video image to a higher or lower resolution. This is commonly confused with deinterlacing. For example, converting an image from 720p to 1080i or 1080p involves scaling, as image resolution changes from 720 to 1080. Converting an image from 1080i to 1080p involves only deinterlacing. See Deinterlacing.

Sensitivity: Loudspeaker specification given in decibels per watt at one meter, or dB/Wm. A speaker with a sensitivity of 91 dB/Wm will produce 91 decibels of sound one meter away from the speaker when powered by 1 watt, as measured in an anechoic chamber. For every 3 dB of volume increase, power must be doubled. So for the 91 dB/Wm speaker to produce 94 dB, 2 watts is required, for 97 dB, 4 watts. Choosing speakers with high sensitivity will drastically reduce the power requirements of your receiver or amplifier, but many of the best sounding, exotic speakers have low sensitivity. Sensitivity of 90 dB is often considered a median level; speakers below 90 dB are considered less sensitive than average, above 90 dB, more sensitive than average.

SMC: Super Multi Coat, Pentax’s proprietary lens multicoating technology. SMC lenses are held in high esteem for their beautiful color rendition.

THD: Total Harmonic Distrortion. THD is a measurement of distortion in audio signals and THD level is often included in audio component specifications. Distortion below .1% is considered inaudible. Distortion over 1% is considered significant, which is why most magazines rate power at clipping at 1% distortion. See Power at Clipping.

XBR: Designation for Sony’s high-end, top-quality television offerings. For a brief time the XBR line was not the top Sony television offering, that honor going to the short-lived Sony Qualia line. See Qualia.

Zuiko: Name brand used by Olympus on their SLR lenses and highest quality camera optics.

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