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Audio Formats: Care and Handling

Learn about various audio formats, preservation techniques, analog to digital conversion, and digital file formats. Understand the importance of care and handling for different media types to ensure long-term preservation. Explore resources for identification and proper storage to maintain audio collections.

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Audio Formats: Care and Handling

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  1. Audio Formats: Care and Handling Digital Stewardship Curriculum

  2. What kind of audio formats are in your collection? What media types do you have experiencewith?

  3. Analog Audio Formats Magnetic Audiotape Cassettes,Open Reel Grooved Media Records, Wax Cylinders Optical Media CDs

  4. Magnetic Media Open reel, Cassettes, Digital Audio Tape, Wire Recordings Composed of a base, binder and metal particles that hold the sound recording

  5. Magnetic Media Preservation Lack of (working) playback equipment Brittleness, physical damage Demagnetization over time Mold Substrate and recording media delamination

  6. Grooved Media Wax Cylinders Discs Vinyl Shellac Acetate (metal or glass)

  7. Grooved Media Preservation Lack of (working) playback equipment Playback wears out the recordings Wax Cylinders Very fragile Discs Fairly fragile Delamination

  8. Optical Media Minidisc CD

  9. Optical Media Preservation Lack of (working) playback equipment Physical damage Scratching Corrosion Delamination Spontaneous Failure

  10. Care and Handling, Storage of Analog Don’t touch the recording media Handle discs by edges Store in cool, dry, dark place Handle with clean hands (or gloves) Store media on-edge/upright Use acid-free/archival cases to store Re-house if necessary Use the right size cases

  11. Resources for Identification Quick Guide in packets PSAP Museum of Obsolete Media Field Audio Collection Evaluation Tool (FACET) Library of Congress Connecting to Collections

  12. Analog to Digital Conversion

  13. Analog and Digital Signals

  14. Analog and Digital Signals

  15. Analog and Digital Signals

  16. Analog and Digital Signals

  17. Digital File Formats

  18. Digital File Formats WAV for Preservation Sample rate: 48 or 96 kHZ Bit depth: 24 bits 1-2 GB/hr MP3 for Access Bit rate: 192 Kbps 86 MB/hr

  19. Digital Storage 3-2-1! At least 3 copies, on at least 2 different storage media, 1 of which is in a different geographic threat region

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