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Digital audio formats

  1. DIGITAL AUDIO MEDIA By John Amels, Camille Bauer-Lostaunau, Monica Suresh, and Pawan Varyani
  2. SAMPLING  All sound in the natural world exists in the form of waves.  These waves are analog, or continuous.  Computers do not understand waves, only 0’s and 1’s.  Computers do this through sampling.
  3. SAMPLING CONT.  Sampling is the analog to digital conversion of all sound.  The sound wave is cut into equal pieces known as samples.  Each sample is the same amount of time.  The more samples per second (or sampling rate), the higher the quality.  The sample rate of a CD is 44,100.
  4. DIGITAL AUDIO PRODUCTION  Digital Audio Production is the process in which the sounds from analog instruments gets recorded and mixed into the music we listen to.  While this was originally done all through analog recording methods such as steel wire, tape, and vinyl records, computers do most of the work today.
  5. DIGITAL AUDIO PRODUCTION CONT.  Professional audio engineers use many different types of technology.  One of the most basic forms of audio production is a voice recorder.  More advanced technologies include mixing boards and Digital Audio Workstations.  A powerful tool that these engineers use is called a Musical Instrument Digital Interface (MIDI).
  6. What?  Portable device that plays and stores digital media  Things to know:  File formats supported  Storage space  Future:  As wireless connection speeds increase, soon we’ll be able to manage our collection in the clouds!
  7. What?  An audio file that contains a broadcast  Facts:  Podcasting allows people to broadcast their message to the world  Available online, example: The Apple Store  Distributed using RSS technology  Allows for convenience
  8. DIGITAL AUDIO FORMATS  Why It Matters?  If the user understands differences between file formats, the users can properly pair digital music services with the players, helps consumers get best quality Facts: Native formats often require lots of bandwidth transmit and lots of computer storage, so digital audio compression was developed. Mp3 is the most recognized digital audio compression format.
  9. NON-COMPRESSED FORMAT Why use non-compressed format? Suitable for archiving and delivering sound at very high resolutions. Most accurate digital representation of sound wave. Examples of non-compressed Format: WAV, AIFF, and Broadcast WAV (BCW), MBWF, Used throughout the digital audio life cycle, even when they are not the target final format.
  10. COMPRESSED FORMAT Why compress? To reduce file size  files will download faster, files will stream over the Internet, more audio may be stored in a given format Varies in size and quality depending on: Sample Rate, Bit depth, Number of channels, Choice of Audio compression codec, and audio compression codec settings Examples of Compressed Formats: i.e. Real audio, MP3, Dolby AC3 (DVD Video)
  11. What is it? Digital Music Software is used to obtain, manage, and listen to digital music, and to encode music to various audio formats. (Definition from Emerge) What can you do with it?  Organize/play digital music, audio, and video files  Sort and arrange them by artist, genre, song title, etc.  Allows users to create a custom playlists that can be transferred to a CD, iPod, or any other portable device  Many popular media players (i.e. iTunes) will provide a music download service that users can add to their music collections. (Emerge)
  12. Continued… With media software, you can sync music with a portable digital music player through the USB port. You can either:  Sync it manually  Set it for automatic, so the next time you plug your device in, it syncs. (Emerge)
  13. What is it? Digital Music Distribution is the way music “gets around”. (Emerge)  CDs  Podcasts  Online music services  Internet radio (Rhapsody, Zune)  Satellite radio  Cell phone music  HD radio services
  14. Continued… Subscription:  Satellite Radio: listener can listen to any to the same channels from any location in range  Napster and Rhapsody charge a monthly fee to provide access to free access to millions of songs/albums (emerge) Download:  iTunes/Amazon: download $0.99/song without subscription to site  Internet radio: similar to FM/AM radio except its digitally delivered to your computer online and more choices  Wi-Fi radios: connect to internet using radio (emerge)
  15. SUGGESTED CHANGES TO IT 101  Too many items of homework due on the same day  Homework's due at different times of the day, example: 12am, as oppose to during class, or before class
  16. CITATIONS  http://www.planetoftunes.com/digiaudio/daudiofiles. html  http://www.jiscdigitalmedia.ac.uk/audio/advice/unco mpressed-audio-file-formats  http://www.webopedia.com/DidYouKnow/Computer _Science/2005/digital_audio_formats.asp  Emerge
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