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The Adaptive Multi-Rate (AMR, AMR-NB or GSM-AMR) audio codec is an audio compression format optimized for speech coding. AMR is a multi-rate narrowband speech codec that encodes narrowband (200–3400 Hz) signals at variable bit rates ranging from 4.75 to 12.2 kbit/s with toll quality [ 3 ] speech starting at 7.4 kbit/s.
AMR-WB was developed by Nokia [1] and VoiceAge and it was first specified by 3GPP. [2] AMR-WB is codified as G.722.2, an ITU-T standard speech codec, formally known as Wideband coding of speech at around 16 kbit/s using Adaptive Multi-Rate Wideband (AMR-WB). G.722.2 AMR-WB is the same codec as the 3GPP AMR-WB.
Extended Adaptive Multi-Rate – Wideband (AMR-WB+) is an audio codec that extends AMR-WB.It adds support for stereo signals and higher sampling rates. Another main improvement is the use of transform coding (transform coded excitation – TCX) additionally to ACELP.
Abstract Meaning Representation, a semantic annotation framework for natural language text; Audio/modem riser, on a computer motherboard; Adaptive Multi-Rate audio codec for speech coding; Adaptive mesh refinement in numerical analysis; AMR radiotelephone network (Czechoslovakia) (in Czech, Automatizovaný městský radiotelefon)
3GP is defined in the ETSI 3GPP technical specification. [1] 3GP is a required file format for video and associated speech/audio media types and timed text in ETSI 3GPP technical specifications for IP Multimedia Subsystem (IMS), Multimedia Messaging Service (MMS), Multimedia Broadcast/Multicast Service (MBMS) and Transparent end-to-end Packet-switched Streaming Service ().
In numerical analysis, adaptive mesh refinement (AMR) is a method of adapting the accuracy of a solution within certain sensitive or turbulent regions of simulation, dynamically and during the time the solution is being calculated. When solutions are calculated numerically, they are often limited to predetermined quantified grids as in the ...
The Sikorsky UH-60 Black Hawk is one of the most ubiquitous and iconic military helicopters, filling multiple roles for the U.S. military, including air assault, general support, medevac, command ...
The requirement is associated with high business value and/or technical risk. The requirement is a concern of a particularly influential stakeholder. The requirement has a first-of-a-kind character, e.g. none of the responsibilities of existing components in the architecture address it.