7 2 Preparing The Elements Audio

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7 2 Preparing The Elements Audio

  1. 1. Gathering d Preparing G h i and P i Multimedia Elements SOUND Linda C. Morosko, 2008 The Web Wizard’s Guide to Web Design, James G. Lengel
  2. 2. Sound Some pages may need sound, music, voice or audio p g y , , effects These are saved as separate files and uploaded to the Web Sound can be recorded into the computer via a microphone and using a sound editing software Audacity is a great piece of audio editing software and it’s FREE! http://audacity.sourceforge.net/ Linda C. Morosko, 2008 The Web Wizard’s Guide to Web Design, James G. Lengel
  3. 3. Sound Voice recording Best done with a microphone directly into the computer Music Copy from CDs (watch for copyright infringement) Internet (MP3 files) ( 3 ) Linda C. Morosko, 2008 The Web Wizard’s Guide to Web Design, James G. Lengel
  4. 4. Sound Tools Audacity http://audacity.sourceforge.net/ Sony Sound Forge RecordSound Linda C. Morosko, 2008 The Web Wizard’s Guide to Web Design, James G. Lengel
  5. 5. Sound Challenge: cannot use continuous data in a digital medium di Instead – it is sampled Take a reading every so often Record the reading at that point Linda C. Morosko, 2008 The Web Wizard’s Guide to Web Design, James G. Lengel
  6. 6. Sound CD Sound Sampled at a rate of 44 kilohertz A sample of sound collected 44,000 per second Each sample contains 16 bits of information about the pitch and volume of the sound at that point in time Sound information is recorded as a number One number for each sample p This is called DIGITIZATION Linda C. Morosko, 2008 The Web Wizard’s Guide to Web Design, James G. Lengel
  7. 7. Sound Digitization g Each CD track is made up of long series of numbers These numbers are converted back into sound and played very fast (44,000 numbers per second) Voila! It sounds to your ear like the original performance. Linda C. Morosko, 2008 The Web Wizard’s Guide to Web Design, James G. Lengel
  8. 8. Sound Challenge: each track contains a huge number of g g numbers Average CD track takes up 25 MB. This Thi would take an hour or longer to send over the Web with a ld t k h l t d th W b ith 56K modem Solution: Compress sound p Use sound-editing software to compress the sound Amount of compression depends on audience High Hi h quality vs. d lit download ti l d time Linda C. Morosko, 2008 The Web Wizard’s Guide to Web Design, James G. Lengel
  9. 9. Sound In addition to choosing a file format ( p3, .wav) you g (.mp3, )y need to choose a c0dec Codec: Stands for: compressor-decompressor Algorithm used to compress the sound fil l ih d h d file You compress to send Viewers must decompress to listen This technique creates files which can be downloaded and saved to the viewer’s computer. What if you don’t want them to take the sound file? Linda C. Morosko, 2008 The Web Wizard’s Guide to Web Design, James G. Lengel
  10. 10. Streaming Media That’s where streaming comes into play (pun intended) g p y p Downloading files requires bandwidth and time, hard drive space, and patience! Audio t A di streaming i Sound plays immediately Is transmitted to user continuously instead of in a single file Requires special server on the sender’s side and a user plug-in Linda C. Morosko, 2008 The Web Wizard’s Guide to Web Design, James G. Lengel
  11. 11. Streaming Media Web Streaming choices: g RealAudio http://www.real.com/ QuickTime http://www.apple.com/quicktime/download/ Windows Media Player http://www.microsoft.com/windows/windowsmedia/player/11/de fault.aspx Linda C. Morosko, 2008 The Web Wizard’s Guide to Web Design, James G. Lengel

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