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
- Answer the questions below and save with your course notes.
- Use a sound editor to make one audio file. Save or export to different sound file types and compare file sizes and quality.
- Name each export version as follows; myAudioAAC256kbs.aac, m audioAAC192kbs.aac, myAudioMP364kbs.mp3 modify your actual file name to the export type
- If you are using Garage Band ver 10, you will need to choose Export to Disk.
- Save all your audio files to your audio files folder :)
FOR YOU TO KNOW
- What is the most common audio file for internet use?
- What is the audio file made by Windows?
- Why does MP3 have such a small file size?
- Explain mp3 audio files.
- Expain wav audio files.
- Explain wma audio files.
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