Mobile Computing Definitions

  • D

    D-AMPS (Digital-Advanced Mobile Phone Service)

    D-AMPS (Digital-Advanced Mobile Phone Service), sometimes spelled DAMPS, is a digital version of AMPS (Advanced Mobile Phone Service), the original analog standard for cellular telephone phone service in the United States.

  • datacard

    A datacard is any removable computer component, approximately the size of a credit card, that contains data, or that contains nonvolatile memory to which data can be written and from which data can be recovered.

  • decibels related to dipole antenna (dBd)

    dBd (decibels related to dipole antenna) is a measure of the gain of an antenna system relative to a dipole antenna at radio frequency.

  • Deep Space Network (DSN)

    The Deep Space Network (DSN) is a sophisticateddata communications system used by the U.S. National Aeronautics and Space Administration (NASA) in conjunction with manned and unmanned space missions.

  • device-agnostic (device agnosticism)

    Device agnostic is a description for computing components that work with various systems without requiring any special adaptations. 

  • digital audio broadcasting (DAB)

  • digital camera

    A digital camera records and stores photographic images in digital form.

  • digital multimedia broadcasting (DMB)

    Digital multimedia broadcasting (DMB) is the process of multicasting by satellite or terrestrial services (or a combination of both) for reception by mobile and portable devices, particularly cell phones... (Continued)

  • digital pen

    A digital pen is a battery-operated writing instrument that allows the user to digitally capture a handwritten note or drawing.

  • Digital Video Broadcasting (DVB)

    Digital Video Broadcasting (DVB) is a set of standards that define digital broadcasting using existing satellite, cable, and terrestrial infrastructures.

  • dipole antenna

    A dipole antenna is a straight electrical conductor measuring 1/2 wavelength from end to end and connected at the center to a radio-frequency (RF) feed line.

  • direct broadcast satellite (DBS)

    Direct broadcast satellite (DBS) refers to satellite television (TV) systems in which the subscribers, or end users, receive signals directly from geostationary satellites.

  • directional sound

    Directional sound is a technology that concentrates acoustic energy into a narrow beam so that it can be projected to a discrete area, much as a laser focuses light... (Continued)

  • disappearing e-mail

    Disappearing e-mail is a message sent using a type of distribution management tool for e-mail.

  • dish antenna

    A dish antenna, also known simply as a dish, is common in microwave systems.

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