Audio Specifications and Standards

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(Resources and Links:)
(Resources and Links:)
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*File Formats - from LOC Digital Preservation/Digital Formats site
 
*File Formats - from LOC Digital Preservation/Digital Formats site
 
**[http://www.digitalpreservation.gov/formats/fdd/fdd000001.shtml Wave]
 
**[http://www.digitalpreservation.gov/formats/fdd/fdd000001.shtml Wave]
 +
:: see also [http://msdn.microsoft.com/en-us/library/ms713504(VS.85).aspx Waveform Audio Reference] - from Microsoft website
 
**[http://www.digitalpreservation.gov/formats/fdd/fdd000003.shtml Broadcast Wave]
 
**[http://www.digitalpreservation.gov/formats/fdd/fdd000003.shtml Broadcast Wave]
 
**[http://www.digitalpreservation.gov/formats/fdd/fdd000198.shtml FLAC (Free Losless Audio Codec)]
 
**[http://www.digitalpreservation.gov/formats/fdd/fdd000198.shtml FLAC (Free Losless Audio Codec)]

Revision as of 08:53, 9 June 2009

Contents

Introduction:

The following provides a brief overview of our standard audio specifications.



Technical Information:

Default File/Output Settings

  • masters: .wav/WAVE at 24-bit/44.1khz
    • note: IASA TC-04 calls for a minimum sampling rate of 48kHz (preferably 96kHz) [1]. We will discontinue use of 44.1kHz sampling rates pending confirmation of appropriate storage space as 24/48 vs 24/44.1 should yield only an 8% increase in space requirements.- arora, 051309
    • note: Our current audio suite Sound Forge does not support export/save of the preferred BWF, Broadcast Wave format (.wav). - arora, 051309
    • typically, 2s of silence is left or created at the beginning of each .wav, with 1s at the end.
    • RMS levels are typically set fairly low, to -25db
  • deliverables: .rm/RealAudio v. 8 at 16-bit/44.1kHz, 105 kbps (stereo)
    • in the near future, our workflow will allow for some enhancement of the Real Audio files (dynamic range compression, higher RMS levels) in order for delivery of pragmatic derivatives; with the preservation .wav file unaffected by such enhancements.

Associated Hardware


Resources and Links:

  • File Formats - from LOC Digital Preservation/Digital Formats site
see also Waveform Audio Reference - from Microsoft website
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