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Skills: audio compression Concepts: quality-file size trade off, capture-edit- compress, lossy versus lossless compression This work is licensed under.

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Presentation on theme: "Skills: audio compression Concepts: quality-file size trade off, capture-edit- compress, lossy versus lossless compression This work is licensed under."— Presentation transcript:

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2 Skills: audio compression Concepts: quality-file size trade off, capture-edit- compress, lossy versus lossless compression This work is licensed under a Creative Commons Attribution-Noncommercial-Share Alike 3.0 License. Audio compression

3 Where does this topic fit? Internet concepts – Applications – Technology – Implications Internet skills – Application development – Content creation – User skills

4 Audio processing work flow Record Edit Compress Distribute

5 123456123456 Which recording is not compressed?

6 No.Data rateFile typeFile size 1320 kbps.mp3114 kB 2Original.wav245 kB 364 kbps.mp323 kB 416 kbps.mp36 kB 5128 kbps.mp346 kB 68 kbps.mp33 kB Which suits your application?

7 Compressing with Audacity

8 Bit rateQuality 8 kbpstelephone 16 kbpsshortwave radio 32 kbpsAM radio 64 kbpsFM radio 96 kbpsnear CD 128 kbpsCD Quality rules of thumb

9 All data types are compressible Image Text Numeric Audio Video

10 Summary

11 Self-study questions How many bytes in a three minute, CD quality song? How many bytes in a three minute telephone quality conversation? What is the final step before distribution in audio, image and video processing? If we do not lose information when doing lossless compression, what changed to reduce the size of the file? (Hint: see http://cis275topics.blogspot.com/2010/10/data- code-information.html).http://cis275topics.blogspot.com/2010/10/data- code-information.html

12 Resource Configure Audacity to export.mp3 files: http://cis275topics.blogspot.com/2011/03/configure- audacity-to-export-mp3-files.html Free software (reviews and links) for doing lossless compression: http://www.techsupportalert.com/best-free-file- archiver-zip-utility.htm

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