Audio compression Skills: Audacity compression IT concepts: quality-file size trade off, capture-edit-compress, lossy versus lossless compression This.

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Presentation transcript:

Audio compression Skills: Audacity compression IT 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.

Where does this topic fit? Internet concepts –Applications –Technology –Implications Internet skills –Application development –Content creation (audio)

All data types are compressible Image Text Numeric Audio Video

Bit DepthSample Rate1 minute3 minutes 1644, Mb30.3 Mb 1648, Mb33 Mb 2496, Mb99 Mb MP3 File128 k/bit rate0.94 Mb2.82 Mb Examples of files sizes for stereo recordings MP 3 is a compressed format.

1. click to playclick to play 2. click to playclick to play Which sounds best? Worst?

Audio file File size (Kbytes) Bit rate (Kbits/s) Play low qualityPlay low quality (.mp3)16 Play originalPlay original (.wav)676688

1. playplay 2. playplay 3. playplay 4. playplay 5. playplay Which sounds best? Worst?

No.Data rateFile typeFile size 1320 kbps.mp3112 kB 2Original.wav233 kB 364 kbps.mp326 kB 416 kbps.mp310 kB 5128 kbps.mp347 kB

Record and edit at high quality

Export > Save as MP3 > click Options Compress for distribution

Variable bit rate

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

Lossy compression Information is lost– the original cannot be recovered

Audio compression Skills: Audacity compression IT 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.

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 in audio, image and video processing? A few questions

Image Text Numeric Audio Video Which data type(s) is/are suited to lossless compression? Lossy compression? Why?