.AAC and.MP3 By: Jared Hendricks & Billy Wolfram

.MP3 Pros Widespread acceptance, support in nearly all hardware audio players and devices. An ISO standard, part of MPEG specs. Fast decoding, lower complexity than AAC or Vorbis. Vorbis produces an audio format specification and software implementation. Relaxed licensing schedule.

.MP3 Cons Lower performance/efficiency than modern codecs. Problem cases that trip out all transform codecs. Sometimes, maximum bitrate (320kbps) isn’t enough. No multichannel implementations. Unusable for high definition audio (sampling rates higher than 48kHz).

.MP3 Examples SanDisk - Clip Zip MP3 Player with 8GB.$59.99 Apple iPod nano 8 GB. $149.00

.MP3 Examples of Pictures SanDisk - Clip Zip MP3 PlayerApple iPod nano

.AAC Pros An international standard approved by the ISO Flexible: supports several sampling rates ( Hz), bit depths, and multichannel (up to 48 channels) Several implementations, including free and high quality ones. Reaches transparency in most samples and for most users at around 150 kbps Part of MPEG-4 specs

.AAC Cons Problem cases that trip out all transform codecs. Heavily patented. Increased complexity. AAC comes in different “flavors” (object types: AAC LC, AAC HE, AAC PS etc.). Many (especially portable) players only support LC (at the moment) so you can have files that are valid but your player won’t play them.

.AAC Examples Low-tech communication are often very simple communication boards or books, from which the user selects letters, words, phrases, pictures, and/or symbols to communicate a message. High-tech AAC aids permit the storage and retrieval of electronic messages, with most allowing the user to communicate using speech output.

.AAC Examples Of Pictures Low TechHigh Tech