- A very high level language, implemented in C++. 2. Quadrature.
Q-Band, also known as V-Band, is a radio bandwidth range between 40 GHz t0 50 GHz.
Q.931 is a connection protocol for ISDN networks defining standards for call signaling, connection setup and breakdown.
Developed by the European Telecommunications Standards Institute, Q.Sig (also known as QSIG), based on ISDN defines signaling protocol between private branch exchanges (PBXs) within a private network. QSIG uses Q.931 and ROSE protocols to prevent call management problems occurring in large networks.
Quality Assurance. Procedures taken to ensure that a company delivers products that conform to standards.
Quadrature Amplitude Modulation. A technique of modulation in which there are sixteen possible four-bit patterns, determined by the combination of phase and amplitude.
|QAM: Quadrature Amplitude Modulation|
Quadrature Amplitude Modulation (QAM) is a type of modulation where the signalling information is carried in the phase and amplitude of the modulated carrier wave. Specifically for QAM, the amplitude of two waves, 90 degrees out-of-phase with each other (in quadrature) are changed (modulated or keyed) to represent the data signal, in which each combination of phase and amplitude represents one of sixteen four-bit patterns.
The version of QuickBASIC that comes with DOS 5 and later versions. It replaces, and accepts programs written for, Microsoft's GW-BASIC.
Query By Example. A user-friendly way of querying a database that was originally developed by IBM for use with mainframes, and later adopted by many other systems. With Query By Example, an empty record is displayed and the user types in the search keys; for example, typing "New York" in the "city" field will return all records where the city is New York.
A DOS hard disk benchmark from Quantum Corporation, which measures data access time and data transfer rate.
|QCIF: Quarter CIF|
Quarter CIF (QCIF) is a video image format which employs 176 horizontal pixels and 144 vertical lines. Although resolution is courser than CIF, QCIF consumes less memory while still achieving an acceptable level of clarity on small displays such as those incorporated in mobile phones.
- Quick And Dirty Operating System. An early personal computer operating system rumored to be the forerunner of PC-DOS and MS-DOS. 2. An operating system designed for the Sinclair QL computer.
Quarterdeck Expanded Memory Manager. A DOS and Windows memory manager from Quarterdeck Office Systems, Santa Monica, California; used for IBM PCs with an Intel 80386 or higher processor.
(Quarter Inch Cartridge drive). A drive used to back up personal computer data on quarter inch cartridges.
Quarter Inch Cartridge tape. A magnetic tape used for backing up data, which comes in hard cartridges. QIC tape comes in minicartridges (3.5") and data cartridges (5.25"). There are various types of cartridges and lengths of tape, storing from 40 megabytes to 25 gigabytes of data.
Quarter Inch Cartridge Wide. A quarter inch cartridge tape from Sony that is wider than 1/4 inch. It is .315" wide and has a greater recording density, thus increasing the storage capacity.
Quarter Inch Cartridge - Extended. These magnetic tape cartridges come in both .25" and .315" formats and contain longer tape to extend the storage capacity of the quarter inch tape drives.
(Quantum Leap). A personal computer developed by Sir Clive Sinclair and first released in 1983. It is based on the Motorola 68008 microprocessor and uses an operating system called QDOS developed by Sinclair.
Quality Micro Systems. A Mobile, Alabama manufacturer of laser printers. QMS made one of the first PostScript printers.
|QoS (Quality of Service)|
QoS is the concept of performance assessment and maintenance of network and telecommunication services. According to QoS, quality services can be guaranteed to a certain extent. Bandwidth and system uptime for instance, are two key measures of network quality.
|QPSK: Quadrature Phase Shift Keying|
Quadrature Phase Shift Keying (QPSK) is a digital modulation scheme that conveys data by changing, or modulating, the phase of a reference signal (the carrier wave). Sometimes known as quaternary or quadriphase PSK or 4-PSK, QPSK uses four points on the constellation diagram, equispaced around a circle. With four phases, QPSK can encode two bits per symbol, shown in the diagram with Gray coding to minimize the BER.
|QSIG (Q â?? point of the ISDN model â?? |
Developed by the European Telecommunications Standards Institute, QSIG, based on ISDN, defines signaling protocol between private branch exchanges (PBXs) within a private network. QSIG uses Q.931 and ROSE protocols to prevent call management problems occurring in large networks.
QuickTime for Windows. Multimedia software from Apple Computer that integrates full-motion video and sound into application programs.
Two bits (a quarter of a byte).