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What (who) is GSM PLMN operator - definition

SPEECH CODING STANDARD

GSM 06.20; GSM-HR

Transfer operator

PUSHFORWARD ON THE SPACE OF MEASURABLE FUNCTIONS

Ruelle operator; Perron-Frobenius operator; Perron-Frobenius Operator; Frobenius-Perron operator; Bernoulli operator; Ruelle-Frobenius-Perron operator; Frobenius–Perron operator; Perron–Frobenius operator

In mathematics, the transfer operator encodes information about an iterated map and is frequently used to study the behavior of dynamical systems, statistical mechanics, quantum chaos and fractals. In all usual cases, the largest eigenvalue is 1, and the corresponding eigenvector is the invariant measure of the system.

https://en.wikipedia.org/wiki/Transfer_operator

Del

VECTOR'S DIFFERENTIAL OPERATOR

Nabla constant; Atled; Nabla operator; Del operator; Vector differential; Vector differential operator; Gradient operator; Divergence operator

Del, or nabla, is an operator used in mathematics (particularly in vector calculus) as a vector differential operator, usually represented by the nabla symbol ∇. When applied to a function defined on a one-dimensional domain, it denotes the standard derivative of the function as defined in calculus.

https://en.wikipedia.org/wiki/Del

Del

VECTOR'S DIFFERENTIAL OPERATOR

Nabla constant; Atled; Nabla operator; Del operator; Vector differential; Vector differential operator; Gradient operator; Divergence operator

·noun Share; portion; part.

Wikipedia

Half Rate

Half Rate (HR or GSM-HR or GSM 06.20) is a speech coding system for GSM, developed in the early 1990s.

Since the codec, operating at 5.6 kbit/s, requires half the bandwidth of the Full Rate codec, network capacity for voice traffic is doubled, at the expense of audio quality. The sampling rate is 8 kHz with resolution 13 bit, frame length 160 samples (20 ms) and subframe length 40 samples (5 ms).

GSM Half Rate is specified in ETSI EN 300 969 (GSM 06.20), and uses a form of the VSELP algorithm. Previous specification was in ETSI ETS 300 581–2, which first edition was published in December 1995.

For some Nokia phones one can configure the use of this codec:

To activate HR codec use enter the following code: *4720#
To deactivate HR codec use enter the following code: #4720#

https://en.wikipedia.org/wiki/Half Rate