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Acoustic echo cancellation
A method for removing acoustic feedback between a loudspeaker and a microphone in loud-speaking audio system.
ActiveX
A Microsoft open technology for Windows-based applications. ActiveX controls can be downloaded as part of a Web document to add functionality to the ActiveX- enabled browser, e.g. Internet Explorer.
AES
Automatic Electronic Shutter, the sensor will automatically adjust the sensitivity according to the changes in illumination of detected area.
AF (Auto Focus)
An ability by which the camera lens automatically adjusts its focus on the captured subject.
AGC
Automatic Gain Control, an electronic circuit which amplifies the video signal when the signal strength falls below a given value due to the lack the light on the image device.
Angle
The area of view, measured in degrees. It is the view that a lens can cover in practical usage. A short focal length has a wide-angle.
Aspect ratio
The ratio of width to height of a screen or video picture. Most TVs and monitors have a 4x3 aspect ration-- the screens are 4 units wide and 3 units high.
AutoIRIS
A special type of iris, is used to adjust the amount of enter light, electrically controlled by the camera.There are two main types of AutoIRIS - Video and DC IRIS. See also Video IRIS and DC IRIS.
AVI
Audio Video Interleave, a Microsoft multimedia file format. An AVI file contains both audio and video data in a standard container that allows simultaneous playback.
AWB
Automatic White Balance, is used in digital camera to automatically compensate the type of light (daylight, fluorescent, incandescent, etc.,) or lighting conditions in the scene.To make it normal for the human eye.
