Audio Specifications and Standards

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(Default File/Output Settings)
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**[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)]
 
**[http://www.digitalpreservation.gov/formats/fdd/fdd000012.shtml MP3 Audio Encoding]
 
**[http://www.digitalpreservation.gov/formats/fdd/fdd000012.shtml MP3 Audio Encoding]
**[http://www.digitalpreservation.gov/formats/fdd/fdd000051.shtml RealAudio v. 10]
 
  
 
*Audio Decision List (ADL)/AES31-3
 
*Audio Decision List (ADL)/AES31-3

Revision as of 14:08, 28 June 2010

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
    • 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.

Update 082809: Real Audio will not be the preferred delivery format as we began use of alternate delivery methods. MP3s will be created with the Lame Encoder using the following setting:

  % lame sample.wav sample.mp3 -V4 --noreplaygain --nohist -S

These setting were decided upon after consulting the Hydrogen Audio site.

Associated Hardware


Resources and Links:

Personal tools