What is amr wb codec

When GSMTM was first being specified, the challenge was to prove that the limited available spectrum could be exploited more efficiently than with the existing analogue systems.

The capacity of systems i. The work resulted in a digital 'full-rate speech' coding algorithm. We use cookies or similar technologies to collect data about your use of this website and to improve your experience when using it. To find out how to disable our cookies, please visit our Privacy Policy.

Search Standards Search Website. Back Codecs. Adaptive Multi-Rate AMR codec Between the encoding and the decoding processes which take place in the transmitting and receiving ends of a communication over a digital network, another important function takes place.

GSM Full Rate codec When GSMTM was first being specified, the challenge was to prove that the limited available spectrum could be exploited more efficiently than with the existing analogue systems. Related Committees 3GPP. The codec being used from the ACS is called the current codec. The current codec switches to other codecs in the ACS as the signal quality changes. If the signal quality decreases, then a more robust codec is used if one exists in the ACS. Likewise, if the signal quality increases, a less robust codec is used if one exists in the ACS.

The point at which the current codec should change to another codec in the ACS is determined by the Threshold and Hysteresis values that can be specified in the test set. The test set allows parameters such as the codecs that define the ACS, current codec, Threshold and Hysteresis values to be changed whether a call exists or not.

Choosing the right mode The network dynamically chooses the AMR speech codec mode and the full rate or half rate channel mode for each call. The choice is based on measurement of the received quality by the mobile station and the base station and on the network load. When the network is less busy, it assigns AMR Full Rate coding to as many calls as possible, starting with those experiencing the poorest radio conditions.

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