Star InactiveStar InactiveStar InactiveStar InactiveStar Inactive
 

SYLLABUS 

  • common file formats for audio 11 ATAR, 12 GEN

 

VOCABULARY

  • audio = music, speech or any other sound
  • mp3 = Moving Pictures experts group MPEG-2 Layer 3 audio (mp3)
  • wav = Waveform audio file format
  • wma = Windows media audio file
  • codec = software/program to compress and decompress data, usually audio and video
  • player = special software/program to play audio files on a computer

DETAILS

Audio file - .mp3

  • mp3 is is a type of encoding
  • mp3 the most common audio file format on the internet
  • small file size, but good quality
  • file size can be reduced 10 times, but audio still fine = 1Mb per minute
  • it removes inaudible audio

Audio file - .wav

  • microsoft audio format for uncompressed audio
  • is uncompressed audio using LPCM, or linear pulse code modulation
  • LPCM is found in making audio CDs
  • file size is about 10Mb per minute

Audio file - .wma

  • is a sound file compressed by Windows media audio codec
  • designed to send audio files over the internet
  • less support than MP3
  • could be better for Windows users

 


 

FOR YOU TO DO

  1. Answer the questions below and save with your course notes.
  2. Use a sound editor to make one audio file. Save or export to different sound file types and compare file sizes and quality.
  3. Name each export version as follows; myAudioAAC256kbs.aac,   m audioAAC192kbs.aac,     myAudioMP364kbs.mp3   modify your actual file name to the export type
  4. If you are using Garage Band ver 10, you will need to choose Export to Disk.
  5. Save all your audio files to your audio files folder :)

FOR YOU TO KNOW

  1. What is the most common audio file for internet use?
  2. What is the audio file made by Windows?
  3. Why does MP3 have such a small file size?
  4. Explain mp3 audio files.
  5. Expain wav audio files.
  6. Explain wma audio files.

 

Learn more from Dr Lex
 
 
 Found an error or enhancement? Please use the contact form under the Home menu item.