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In essence, a trunked radio system is a packet switching computer network. Users' radios send data packets to a computer, operating on a dedicated frequency — called a control channel — to request communication on a specific talkgroup.
Digital electronics is a field of electronics involving the study of digital signals and the engineering of devices that use or produce them. This is in contrast to analog electronics which work primarily with analog signals.
Informally, a message authentication code system consists of three algorithms: A key generation algorithm selects a key from the key space uniformly at random. A signing algorithm efficiently returns a tag given the key and the message. A verifying algorithm efficiently verifies the authenticity of the message given the same key and the tag.
The decreasing cost of display equipment and processors made it practical to provide graphical user interfaces for many operating systems, such as the generic X Window System that is provided with many Unix systems, or other graphical systems such as Apple's classic Mac OS and macOS, the Radio Shack Color Computer's OS-9 Level II/Multi-Vue ...
A Bigston-based 410 Program Recorder, the first model sold. The Day-Glo orange sticker inside the tape area makes the tape position more visible. A Chelco-based 410, the first widespread version of the Program Recorder The 1010 was smaller than the 410 models and added a power LED. The XC12 was the last of the line.
The digital revolution converted technology from analog format to digital format. By doing this, it became possible to make copies that were identical to the original. In digital communications, for example, repeating hardware was able to amplify the digital signal and pass it on with no loss of information in the signal. Of equal importance to ...
Example of an ACARS message. In aviation, ACARS (/ ˈ eɪ k ɑːr z /; an acronym for Aircraft Communications Addressing and Reporting System) is a digital datalink system for transmission of short messages between aircraft and ground stations via airband radio or satellite. The protocol was designed by ARINC and deployed in 1978, [1] using the ...
Q is a programming language for array processing, developed by Arthur Whitney. It is proprietary software, commercialized by Kx Systems. Q serves as the query language for kdb+, a disk based and in-memory, column-based database. Kdb+ is based on the language k, a terse variant of the language APL. Q is a thin wrapper around k, providing a more ...
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