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Advanced Audio Coding (AAC) is an audio coding standard for lossy digital audio compression. It was designed to be the successor of the MP3 format and generally achieves higher sound quality than MP3 at the same bit rate. [4] AAC has been standardized by ISO and IEC as part of the MPEG-2 and MPEG-4 specifications.
AAC can be a permanent addition to a person's communication or a temporary aid. Stephen Hawking, probably the best-known user of AAC, had amyotrophic lateral sclerosis, and communicated through a speech-generating device. Modern use of AAC began in the 1950s with systems for those who had lost the ability to speak following surgical procedures.
HE-AAC is supported in the open source FAAD/FAAD2 decoding library and all players incorporating it, such as VLC media player, Winamp, foobar2000, Audacious Media Player and SonicStage. The Nero AAC Codec supports decoding HE and HEv2 AAC. HE-AAC is also used by AOL Radio and Pandora Radio clients to deliver high-fidelity music at low bitrates.
The 'Music' category is merely a guideline on commercialized uses of a particular format, not a technical assessment of its capabilities. For example, MP3 and AAC dominate the personal audio market in terms of market share, though many other formats are comparably well suited to fill this role from a purely technical standpoint.
Dynavox produce a range of speech generating devices, including the very small 'Xpress', and the 'Tango', which was designed particularly for children. Its newest device is called the Maestro, which, like the older V+ and VMax+ and M 3, provides options for multiple communication channels including cell phone, text messaging and e-mail.
Such display devices have a simpler learning curve than some other devices. Fixed display devices replicate the typical arrangement of low-tech AAC devices (low-tech is defined as those devices that do not need batteries, electricity or electronics), like communication boards.
Music in the store is in the Advanced Audio Coding (AAC) format, which is the MPEG-4-specified successor to MP3. Originally, songs were only available with DRM and were encoded at 128 kbit / s . At the January 2009 Macworld Expo, Apple announced that all iTunes music would be made available without DRM, and encoded at the higher-quality rate of ...
Semantic compaction, (Minspeak), conceptually described as polysemic (multi-meaning) iconic encoding, is one of the three ways to represent language in Augmentative and alternative communication (AAC). [1] It is a system utilized in AAC devices in which sequences of icons (pictorial symbols) are combined in order to form a word or a phrase.