- 産業: Telecommunications
- Number of terms: 29235
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ATIS is the leading technical planning and standards development organization committed to the rapid development of global, market-driven standards for the information, entertainment and communications industry.
A measure of the degree of balance between two impedances connected to two conjugate sides of a hybrid set, coil, network, or junction. 2. A measure of the effectiveness with which a balancing network simulates the impedance of a two-wire circuit at a hybrid coil.
Industry:Telecommunications
A measure of the deviation of the frequency of a signal from a reference, expressed as a ratio. The ratio is dimensionless but typically expressed as parts per million, ppm. For example, 4. 6 ppm = 4. 6/106. Fractional frequency offset = where: f = the actual frequency output of the signal in question, and fr = the reference frequency. Synonym fractional frequency deviation.
Industry:Telecommunications
A measure of the difference between a given signal and a reference signal. Note: For analog signals, the signal distance is the root mean square difference between the given signal and a reference signal over a symbol period. 2. Synonym Hamming distance.
Industry:Telecommunications
A measure of the intelligibility of voice signals, expressed as a percentage of speech units that are understood by the listener when heard out of context. Note: The articulation index is affected by noise, interference, and distortion.
Industry:Telecommunications
A measure of the security of a trusted function, or a set of trusted functions, as calculated by a competent authority. Note: For HMG purposes, the Head of the Certification Body of the UK Scheme is the "competent authority". See also: Assurance, Confidence Level.
Industry:Telecommunications
A measure of the thermal noise generated in the first stage of a receiver.
Industry:Telecommunications
A measure, in kelvins (K,) proportional to the thermal energy of a given body at equilibrium. Note 1: A temperature of 0 K is called "absolute zero," and coincides with the minimum molecular activity (i.e., thermal energy) of matter. Note 2: Thermodynamic temperature was formerly called "absolute temperature. " Note 3: In practice, the International Temperature Scale of 1990 (ITS-90) serves as the basis for high-accuracy temperature measurements in science and technology.
Industry:Telecommunications
A measure, in kelvins (K,) proportional to the thermal energy of a given body at equilibrium. Note 1: A temperature of 0 K is called "absolute zero," and coincides with the minimum molecular activity (i.e., thermal energy) of matter. Note 2: Thermodynamic temperature was formerly called "absolute temperature. " Note 3: In practice, the International Temperature Scale of 1990 (ITS-90) serves as the basis for high-accuracy temperature measurements in science and technology.
Industry:Telecommunications
A measurement of traffic operating work which is used to express the relative time required to handle the various kinds of calls or work functions, and which is weighted to reflect appropriate degrees of waiting to serve time.
Industry:Telecommunications
A measuring instrument in the Earth exploration-satellite service or in the space research service by means of which information is obtained by reception of radio waves of natural origin.
Industry:Telecommunications
