ACFMActual Cubic Feet per Minute. The actual flow of air or gas delivered to the discharge connection of a compressor stated in cubic feet per minute under the conditions of temperature and pressure prevailing at the inlet of the compressor. ACFM for a given compressor running at a given speed remains constant irrespective of the temperature, atmospheric pressure or altitude of the operating site of the compressor.Close Window
ActiveXActiveX is a framework for defining reusable software components that perform a particular function or a set of functions in Microsoft Windows. Normally activeX is used in Internet Explorer.Close Window
ADPCMAdaptive DPCM (ADPCM) is a variant of DPCM (differential pulse-code modulation) that varies the size of the quantization step, to allow further reduction of the required bandwidth for a given signal-to-noise ratio.Close Window
AGCAutomatic gain control (AGC) is an adaptive system found in many electronic devices. The average output signal level is feedback to adjust the gain to an appropriate level for a range of input signal levels.Close Window
ALCThe process by which the illumination incident upon the face of a pickup device is automatically adjusted as a function of scene brightness.Close Window
Angle of viewIn photography, angle of view describes the angular extent of a given scene that is imaged by a camera. It is used interchangeably with the more general term field of view.Close Window
APBA security mechanism preventing an access card or similar device from being used to enter an area a second time without first leaving it (so that the card cannot be passed back to a second person who wants to enter).Close Window
ASICApplication-specific integrated circuit, an integrated circuit (IC) customized for a particular use, rather than intended for general-purpose use.Close Window
ASKASK is a form of modulation that represents digital data as variations in the amplitude of a carrier wave. The amplitude of an analog carrier signal varies in accordance with the bit stream (modulating signal), keeping frequency and phase constant. The level of amplitude can be used to represent binary logic 0s and 1s.Close Window
Aspect ratioThe aspect ratio of a shape is the ratio of its longer dimension to its shorter dimension. It may be applied to two characteristic dimensions of a three-dimensional shape or for symmetrical objects that are described by just two measurements.Close Window
Aspherical LensA Lens designed with a non spherical shape so that it refracts the light passing through it to either lower the lens aperture so that it passes more light or decreases barrel distortion on wide angle lenses.Close Window
Automatic Light ControlThe process by which the illumination incident upon the face of a pickup device is automatically adjusted as a function of scene brightness.Close Window
AWBA system for detecting errors in color balance in white and black areas of the picture and automatically adjusting the white and black levels of both the red and blue signals as needed for correction.Close Window