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"Archiving Digital Audio Files"

"Archiving Digital Audio Files"

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Transcript

  • 1. Archiving Digital Audio Files Victoria Sloyan futureArch Project Graduate Library Trainee Scheme Project Showcase 7 th July 2010
  • 2. Aims <ul><li>Select a container format </li></ul><ul><li>Determine best way to capture audio </li></ul><ul><li>Decide how to deliver audio to users </li></ul>
  • 3. Types of format <ul><li>Uncompressed: Sound and silence are encoded at the same number of bits/second </li></ul><ul><li>Lossless: Use fewer bits/second to encode silence. Sound data is an exact replica, but the file size is reduced </li></ul><ul><li>Lossy: Entire file is compressed. The result is very similar, but not identical to the pre-compressed data. File size is significantly reduced </li></ul>
  • 4. Which file format? <ul><li>Uncompressed </li></ul><ul><li>Open source </li></ul><ul><li>Standardised </li></ul><ul><li>Recommended by Library of Congress and British Library </li></ul>WAVE (.wav)
  • 5. Exact Audio Copy (EAC)
  • 6. Metadata <ul><li>Record ID </li></ul><ul><li>Collection name </li></ul><ul><li>Disk number </li></ul><ul><li>Date record created </li></ul><ul><li>Case or sleeve label </li></ul><ul><li>Physical disk label </li></ul><ul><li>Media type </li></ul><ul><li>Brand </li></ul><ul><li>Capacity </li></ul><ul><li>Capacity used </li></ul><ul><li>File format </li></ul><ul><li>Encoding schema </li></ul><ul><li>Sample rate </li></ul><ul><li>Bit depth </li></ul><ul><li>Bit rate </li></ul><ul><li>Duration </li></ul><ul><li>Extraction software used </li></ul><ul><li>Hardware configuration </li></ul><ul><li>Drive used </li></ul><ul><li>Disk folder name </li></ul><ul><li>Disk number of tracks </li></ul><ul><li>Errors of disk </li></ul><ul><li>Date extracted </li></ul><ul><li>Date ingested </li></ul><ul><li>Date of recording </li></ul><ul><li>Genre </li></ul><ul><li>Contributors </li></ul><ul><li>Scope and content </li></ul><ul><li>Rights information </li></ul><ul><li>Access restrictions </li></ul>
  • 7. Delivering Audio Better sound quality and small file size Better sound quality Original quality and size Most users Compressed and processed Optimised MP3 Users who require WAVE format Uncompressed and processed Processed WAVE Preservation Large, uncompressed file Master WAVE
  • 8. Processing Files
  • 9. Conclusion <ul><li>Select a container format </li></ul><ul><ul><ul><li>WAVE </li></ul></ul></ul><ul><li>Determine best way to capture audio </li></ul><ul><ul><ul><li>Rip it using a secure ripper (EAC) </li></ul></ul></ul><ul><li>Decide how to deliver audio to users </li></ul><ul><ul><ul><li>Use processed files and access them by streaming </li></ul></ul></ul>

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