Audio Specifications and Standards

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====Default File/Output Settings====
 
====Default File/Output Settings====
 
* <u>masters</u>: .wav/WAVE at 24-bit/44.1khz
 
* <u>masters</u>: .wav/WAVE at 24-bit/44.1khz
**''note: [http://www.iasa-web.org/special_publications.asp IASA TC-04] calls for a minimum sampling rate of 48kHz (preferably 96kHz) [http://www.jazzpoparkisto.net/audio/audio32.html]. 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
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**''note: [http://www.iasa-web.org/tc04/key-digital-principles IASA TC-04] calls for a minimum sampling rate of 48kHz (preferably 96kHz). 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. Projects already underway at the 24/44.1 spec will maintain that specification.'' - arora, 062910. ''Update: given remaining storage concerns, we will continue with 24/44.1.'' - arora, 030911.
**''note: Our current audio suite [[Sound Forge (Sony) | Sound Forge]] does not support export/save of the preferred BWF, Broadcast Wave format (.wav). - arora, 051309
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**typically, 2s of silence is left or created at the beginning of each .wav, with 1s at the end.  
 
**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
 
**RMS levels are typically set fairly low, to -25db
* <u>deliverables</u>: .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====
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  For information on derivatives, see [[For_Creating_Derivatives]]
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====Associated Hardware/Software====
 
*see [[Digital Audio Workstation (DAW)]]
 
*see [[Digital Audio Workstation (DAW)]]
  
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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
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**: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)]
**[http://www.digitalpreservation.gov/formats/fdd/fdd000051.shtml RealAudio v. 10]
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**[http://www.digitalpreservation.gov/formats/fdd/fdd000012.shtml MP3 Audio Encoding]
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*Audio Decision List
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**(ADL)/AES31-3
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***[http://mixonline.com/mag/audio_aeseliminating_file_exchange/ The AES31 Standard] (2001) De Lancie, Philip.
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***[http://digitalcontentproducer.com/mag/video_aes_standard/ AES31--Eliminating the File Exchange Conundrum] (2001) Lambert, Mel.
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** [http://www.cs.cf.ac.uk/Dave/Multimedia/node296.html Open Media Framework Interchange] format (OMFI)
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** [http://aaf.sourceforge.net/ Advanced Authoring Format] (AAF)
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**SimpleADL
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*** [http://blog.humaneguitarist.org/projects/audioregent/#SimpleADL SimpleADL]
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**Other
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*** [http://www.aatranslator.com.au/ AA Translator]
  
*Audio Decision List (ADL)/AES31-3
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*Tools
**[http://mixonline.com/mag/audio_aeseliminating_file_exchange/ The AES31 Standard] (2001) De Lancie, Philip.
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**[http://www.digitalconfidence.com/MetadataTouch.html Metadata Touch]
**[http://digitalcontentproducer.com/mag/video_aes_standard/ AES31--Eliminating the File Exchange Conundrum] (2001) Lambert, Mel.
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**[http://bwfmetaedit.sourceforge.net/ BWF MetaEdit]
**see also: [http://www.cs.cf.ac.uk/Dave/Multimedia/node296.html/ Open Media Framework Interchange] format (OMFI)
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**see also: [http://aaf.sourceforge.net/ Advanced Authoring Format] (AAF)
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Latest revision as of 11:37, 9 March 2011

Contents

[edit] Introduction:

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



[edit] Technical Information:

[edit] 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). 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. Projects already underway at the 24/44.1 spec will maintain that specification. - arora, 062910. Update: given remaining storage concerns, we will continue with 24/44.1. - arora, 030911.
    • 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
  For information on derivatives, see For_Creating_Derivatives

[edit] Associated Hardware/Software


[edit] Resources and Links:

Personal tools