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Technical Terms and Abbreviations Glossary: A

Access Point, AP, Apps, ASCII, AMR-WB

AP (abbr.): Access Point. Base Station in a wireless network (see also -> WLAN).

Apps (abbr.): Abbreviation of "Applications". Software for smart phones (see also -> Smart Phone) and hand-held computer (see also -> PDA).

ASCII (abbr.): The American Standard Code for Information Interchange
(ASCII /'æski/ ASS-kee) is a character-encoding scheme originally based on the english alphabet that encodes 128 specified characters - the numbers 0-9, the letters a-z and A-Z, some basic punctuation symbols, some control codes that originated with Teletype machines, and a blank space - into the 7-bit binary integers.

ASCII codes represent text in computers, communications equipment, and other devices that use text. Most modern character-encoding schemes are based on ASCII, though they support many additional characters.


This article is based on the article ASCII from the free encyclopedia Wikipedia and is licensed under the dual GNU lizenz for free documentation and Creative Commons CC-BY-SA 3.0 Unported (short version). 
A list of authors is available in Wikipedia.

AMR-WB (abbr.): Adaptive Multi-Rate Wideband is a patented wideband speech coding standard developed based on Adaptive Multi-Rate encoding, using similar methodology as Algebraic Code Excited Linear Prediction (ACELP). AMR-WB provides improved speech quality due to a wider speech bandwidth of 50–7000 Hz compared to narrowband speech coders which in general are optimized for POTS wireline quality of 300–3400 Hz.

AMR-WB was developed by Nokia and VoiceAge and it was first specified by 3GPP.

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. The corresponding 3GPP specifications are TS 26.190 for the speech codec and TS 26.194 for the Voice Activity Detector.

AMR-WB codec has the following parameters:
    Delay frame size: 20 ms
    Look ahead: 5ms
    Complexity: 38 WMOPS, RAM 5.3KWords
    Voice activity detection, Discontinuous Transmission, Comfort Noise Generator
    Fixed point: Bit-exact C
    Floating point: under work.

A common file extension for AMR-WB file format is .awb. There also exists another storage format for AMR-WB that is suitable for applications with more advanced demands on the storage format, like random access or synchronization with video. This format is the 3GPP-specified 3GP container format based on ISO base media file format. 3GP also allows use of AMR-WB bit streams for stereo sound.

Reference/read more at: Wikipedia

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Keyword list: A, AMR-WB, ASCII, Apps, Computer, Glossary, IT, Software, WLAN

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