MIDI to AAC

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File extension .midi
Category Music File
Description The MIDI file was developed to allow both musicians and audio developers to transfer MIDI data from one software application to another. The MIDI file contains messages that specify notation, pitch, velocity and control signals for volume, vibrato, audio panning that synchronise tempo between multiple devices. Historically you would have needed four seperate keyboard instruments, but now with MIDI files you can play multiple instruments from a single controller.
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Technical Details MIDI messages are made up of 8-bit words that are transmitted serially at 31.25 kbaud. A MIDI link can carry sixteen independent channels of information, MIDI messages can be channel messages, which are sent on only one of the 16 channels and can be heard only by devices receiving on that channel, or system messages, which are heard by all devices. There are five types of message: Channel Voice, Channel Mode, System Common, System Real-Time, and System Exclusive. There are two variations of the Standard MIDI File format, called Type 0 and Type 1. Type 0 is a single track of data; Type 1 is multi-track.
Associated programs Audio Evolution
GarageBand
Master Tracks Pro
Sonar
Developed by Various
MIME type audio/midi
audio/x-midi
Useful links List of MIDI Editors and Sequencers
MIDI file information
Convert MIDI file
File extension .aac
Category Music File
Description AAC is similar to MP3. It essentially cuts out, or compresses, information that the human ear cannot pick up thereby making digital files smaller and more easily managed and therefore quicker to download. AAC is about half the size of MP3 but with better quality. It is at least one tenth the size of CD digital data. Apple are the biggest users of this format and if you have an iPod or iPhone then you will have come across this format as it is iTunes default audio format.
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Technical Details AAC is similar in concept to MP3 but goes further. It too compresses digital audio files but to a bigger degree. It is also part of the MPEG-4 standard, it is most widely used to create small digital audio files. The current variant is specified in ISO/IEC standard 14496-3. Like MP3, AAC is a lossy algorithm. The human hearing system cannot hear quiet sounds in the presence of loud sounds of a similar frequency; for example, a voice conversation cannot be heard while an aeroplane flies low overhead. This is known as auditory masking, this allows the discarding of data with minimal loss of quality.
Associated programs KMPlayer
RealPlayer
VideoLAN VLC Media Player
Windows Media Player
iTunes
Developed by A combination of Fraunhofer IIS, AT&T Bell Laboratories, Dolby and Sony Corporation
MIME type audio/aac
Useful links More detail about the AAC file format
How to play AAC files
Convert AAC file

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