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    The glossary explains technical terminologies in an easy-to-understand format.

    Glossary
    Term Description
    AGC

    Automatic 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.

    AF

    Automatic focus systems rely on one or more sensors to determine correct focus.

    ADSL

    ADSL is one form of the Digital Subscriber Line technology, a data communications technology that enables faster data transmission over copper telephone lines than a conventional voiceband modem can provide. It does this by utilizing frequencies that are not used by a voice telephone call. A splitter allows a single telephone connection to be used for both ADSL service and voice calls at the same time.

    ADPCM

    Adaptive 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.

    Address

    An Internet Protocol (IP) address is a numerical label that is assigned to devices participating in a computer network that uses the Internet Protocol for communication between its nodes.

    ADC

    An analog-to-digital converter is a device which converts continuous signals to discrete digital numbers. The reverse operation is performed by a digital-to-analog converter.

    Adaptive mode

    Device control sensor parameter by itself for improving entered fingerprint status. When we use this mode, registration takes more time than not using.

    Adapter

    An electrical adapter may enable connection of a socket used in one region to a plug used in another by offering connections for the disparate contact arrangements, while not changing the voltage.  Subsidize device for machine and device for purpose or for attaching.

    ACU

    This is a abbreviation of Access Control Unit.

    ActiveX

    ActiveX 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.

    Activate

    Make something to activate.

    ACK

    When event occurred on video, a manager delete the mark thereby pressing ACK button.

    Access point

    Controled physical point from system like doors and gate.

    Access level

    Rate of defined authority and access time from reader

    Access granted/denied

    Access granted/denied is a capacity which enables/disables an authority to control access to areas and resources in a given phisical facility.

    Access control Access control is a system which enables an authority to control access to areas and resources in a given physical facility.
    AAC

    Standard of audio compression method. This is the next generation of MP3.

    Auto-Terminating Feature whereby the equipment automatically selects the correct termination depending on whether the video output BNC is connected.
    Automatic Iris Lens A lens in which the aperture automatically opens or closes to maintain proper light levels on the camera's pickup device.
    Automatic Gain Control(AGC) An electronic circcuit used by which the gain of a signal is automatically adjusted as a function of its input or other specified parameter.
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