Compressor

A compressor is:

  1. A mechanical device that takes in a gas and increases its pressure by squeezing a volume of it into a smaller volume. Heat is generated in the gas due to the ineffeciancy of the compressor. Important kinds of compressors include: Reciprocating compressors, Centrifugal compressors, and Turbo-charger. Closely related to pumps.
  2. A device or computer program that reduces the dynamic range of a signal. In audio production, a compressor is often applied to the final mix as part of the mastering process. See audio level compression.


In the News

EU Domain Dream in Disarray
Intended as a tool to help foster greater European unity, the new dot-eu domain produces a bitter fight between trademark holders and alleged cybersquatters over coveted addresses. Robert Andrews reports from Cardiff, Wales.

Multiple Species Of Bacteria May Cause Trachoma: Implications For Trea
Researchers have found that more than one species of bacteria may be causing the infectious eye disease trachoma. Six million people -- most of whom live in crowded and unhygienic conditions in the developing world -- are blind because of the disease and many more are actively infected. The possibility that multiple strains of the Chlamydiceae family of bacteria are involved in trachoma would involve a re-evaluation of vaccines and treatment programs.

FishWatch: U.S. Seafood Facts
This site "can help you make informed decisions about the seafood you eat by providing you with the most accurate and timely information available on the sustainability of U.S. seafood fisheries."Features news, background about seafood and your health, and details about selected types of fish. Also includes data on U.S. seafood imports and exports, a glossary, and descriptions of how some commonly used fishing vessels work. From NOAA's National Marine Fisheries Service.

Engineered Molecule Amplifies Body's Immune Response
By altering a molecule called Stat1, which is involved in cellular immune signaling, scientists have succeeded in making the molecule more responsive and thus more efficient. This old protein with a new twist may eventually be used to improve the body's defense against infection.

'Birdbrain' No Longer Means 'Stupid,' Asserts Scientific Consortium
An international consortium of 29 neuroscientists has proposed a drastic renaming of the structures of the bird brain to correctly portray birds as more comparable to mammals in their cognitive ability. The scientists assert that the century-old traditional nomenclature is outdated and does not reflect new molecular, genetic and behavioral studies that reveal the brainpower of birds.

In Presence Of Fragrant Cleaning Products, Air Purifiers That Emit Ozo
Indoor air purifiers that produce even small quantities of ozone may actually make the air dirtier when used at the same time as household cleaning products, scientists at UC Irvine have discovered.

Needle-free Vaccine May Protect Against C. Difficile Infection
Researchers have developed a transcutaneous (needle-free) vaccine delivered through a patch applied to the skin that protects mice from C. difficile infection. Clostridium difficile is the leading cause of nosocomial diarrhea worldwide with more than 300,000 cases reported each year in the U.S. alone. The recent emergence of a new highly virulent strain has increased the need for effective preventative treatment methods.

Falcon Gaming Laptop Crushes Benchmarks, Flattens Wallets
The Falcon Northwest FragBook gaming laptop has three hard drives and demon speed. It also weighs more than 12 pounds (ouch) and costs more than $7,600 (ouch again).

Aging Films Get Digital Face Lift
A wall of 700 Mac G5s is responsible for salvaging some of Hollywood's most precious films, like Star Wars and, er, Miami Vice. By Evan Shamon from Wired Test.

Buckyballs To Fight Allergy?
A research team has identified a new biological function for a soccer ball-shaped nanoparticle called a buckyball -- the ability to block allergic response, setting the stage for the development of new therapies for allergy.


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