An AAC user uses number coding on an eye gaze communication board

Augmentative and alternative communication ( AAC ) is an umbrella term that encompasses methods of communication for those with impairments or restrictions on the production or comprehension of spoken or written language.

AAC systems are extremely diverse and depend on the capabilities of the user.

The popular MP3 format is probably the best-known example, but the AAC format found on the iTunes Music Store is also common.

For example, uncompressed songs in CD format have a data rate of 16 bits / channel x 2 channels x 44. 1 kHz ≅ 1. 4 Mbit / s, whereas AAC files on an iPod are typically compressed to 128 kbit / s, yielding a compression ratio of 0. 09, for a data-rate savings of 0. 91, or 91 %.

Harry had to pass his flying assessment at the Army Air Corps Base ( AAC ), Middle Wallop, the result of which determined if he would pass on to train as a pilot of either the Apache, Lynx, or Gazelle helicopter.

Prince Harry was presented with his flying brevet ( wings ) by his father, on 7 May 2010, at a ceremony at the Army Air Corps Base ( AAC ), Middle Wallop.

Speech-Language Pathologists ( SLPs ), often with specialized AAC training and knowledge, provide education and training to families, educational teams, and other communication partners on these tools.

A related transform, the modified discrete cosine transform, or MDCT ( based on the DCT-IV ), is used in AAC, Vorbis, WMA, and MP3 audio compression.

The rise of inexpensive all-solid-state portable digital music systems based on MP3, AAC and similar formats finally saw the eventual decline of the domestic cassette deck.

It focuses on the Ogg family of formats, the most successful of which has been Vorbis, an open and freely licensed audio format and codec designed to compete with the patented MP3 and AAC.

From 2004 until 2009, The Watchtower was released on CD in MP3 format ; digital files are now available for download in MP3 and AAC / M4B formats.

is available, in selected languages, on audio compact disc and via download in MP3, AAC, PDF and EPUB formats.

Founded in 1997 as Albany Anthrocon ( AAC ) in New York State, with a membership of about 500, the convention moved to Valley Forge, Pennsylvania in 1999 and 2000 ; then to a larger hotel, the Adams Mark, on the outskirts of Philadelphia in 2001.

Simpson also implemented their new Engaged Citizenship Curriculum, which is largely based on the AAC & U LEAP intiative.

FairPlay digitally encrypts AAC audio files and prevents users from playing these files on unauthorized computers.

The channel was launched on November 5, 2001 as a joint venture between AAC and BBC Worldwide.

The channel was launched on September 7, 2001 under its current name as a joint venture between AAC and BBC Worldwide.

The flight's base at Dhekelia has been closed for sometime and the Flight are no longer listed on the AAC Website as an active flight.

This enables AAC users to communicate independently once the other party is on the line.

Along with language modeling, basic word prediction on AAC devices is often coupled with a recency model, where words that are used more frequently by the AAC user are more likely to be predicted.

In May 2004, a series of double-blind listening tests ( as reported on Slashdot ) suggested that Musepack and Ogg Vorbis ( which was the 1. 1 " aoTuV " fork at the time ) were the two best available codecs for high-quality audio compression at bitrates around 128kbit / s, beating MP3, AAC, WMA, and ATRAC.

In January 1939, Major General Henry “ Hap ” Arnold, who became chief of the U. S. Army Air Corps ( AAC ), proposed to Congress that money be spent on a strong air defense.

* Vedia A10 plays Ogg Vorbis and FLAC in addition to MP3, AAC and other formats

Modern units can play other formats in addition to PCM audio coding used in CDs, such as MP3, AAC and WMA.

The research results of his dissertation are the basis of MPEG-1 Layer 3 ( mp3 ), MPEG-2 Advanced Audio Coding ( AAC ) and most other modern audio compression schemes.

By the late 1980s and the early 1990s, the 45 rpm record would decrease in popularity and other means would be used to evaluate the popularity of new songs, such as cassette-single, CD single, and digital MP3 / AAC sales ( plus radio airplay ).

The channel primarily aired programs from the UK, from which the vast majority were sourced from the BBC and its affiliated channels ; however, throughout its history under the ownership of AAC and its subsequent incarnations under Canwest and Shaw, select programs were sourced from other countries and other British broadcasters such as Tots TV, Mr Bean: The Animated Series, and The Sleepover Club.

However, Apple Lossless is not a variant of AAC ( which is a lossy format ), but rather a distinct lossless format that uses linear prediction similar to other lossless codecs.

The AAC develops activities such as theatre, cinema, radio and television broadcast, music, choral singing, journalism or philately, as well as rowing, athletics and many other sports.

This completely eliminates compression artifacts that occur when recording directly to lossy audio formats such as Sony's ATRAC, or other formats like MP3, AAC, Windows Media Audio ( WMA ).

The other methylase enzyme, EcoKI, causes mehtylation of adenine in the sequences AAC ( N6A ) GTGC and GCAC ( N6A ) GTT.

2010 + models come standard with a USB connection that interfaces with Apple inc. iPod players and other USB mass storage devices, such as flash drives that contain MP3, WMA6 or AAC music files while being stored in the center console.

The FAAC encoder is an audio compression computer program that creates AAC ( MPEG-2 AAC / MPEG-4 AAC ) sound files from other formats ( usually, audio files taken from audio CDs ).

AAC groundcrew need to be able to work as part of a team, and on occasion as an individual, and may be expected to defend forward operating bases and forward arming refuelling points, they also refuel and re-arm the helicopters and provide the essential communications to the aircraft and other army units.

The AAC is historically and contemporarily associated with a number of other American and International organizations.

From the time of its founding until the mid-1980s, candidates for membership in the AAC were required to submit a list of notable ascents at high altitude or other “ significant alpine accomplishments ” The phrase “… or the equivalent ” appeared at the end of this bylaw, allowing the Board to elect artists and writers with little tangible experience, but for the most part, membership in the Club meant that a person had already achieved a great deal in the world of mountaineering.

Designed to work with iTunes, it can fingerprint MP3, AAC files, or any other format playable with QuickTime, and passes metadata information to iTunes.

AAC has been produced for more than 70 years, and it offers advantages over other cementitious construction materials, one of the most important being its lower environmental impact.

Unlike most other concrete applications, AAC is produced using no aggregate larger than sand.

It is one of the few mobile phones to be weather and shock resistant ( tested to comply with the IP54 standard ), while not skimping on other features like a 1. 3MP digital camera, 262k color screen and a digital music player supporting the MP3 and AAC formats.