Difference between revisions of "Audio"
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==Comments== | ==Comments== | ||
| + | *Audio files are normalized to WAVE LPCM with a bit depth of 16 bits per sample and a sampling frequency of 48000 HZ. | ||
*Library of Congress considers WAVE LPCM as the "preferred format for sound recordings." [http://www.digitalpreservation.gov/formats/fdd/fdd000002.shtml Library of Congress Sustainability of Digital Formats: WAVE Audio File Format with LPCM audio] | *Library of Congress considers WAVE LPCM as the "preferred format for sound recordings." [http://www.digitalpreservation.gov/formats/fdd/fdd000002.shtml Library of Congress Sustainability of Digital Formats: WAVE Audio File Format with LPCM audio] | ||
| − | *Florida Digital Archive normalizes audio streams contained in WAVE files to uncompressed PCM(LPCM) with a | + | *Florida Digital Archive normalizes audio streams contained in WAVE files to uncompressed PCM(LPCM) with a bit depth of 16 bits per sample. See [http://www.fcla.edu/digitalArchive/formatInfo.htm Preservation action plans: WAVE]. |
| + | *According to [http://www.carli.illinois.edu/mem-prod/contentdm/guidelines_for_audio.pdf Guidelines for the Creation of Digital Collections: Digitization Best Practices for Audio, Consortium of Academic and Research Libraries in Illinois, 2009], WAVE LPCM with with a bit-depth of 16 bits and a sampling freqency of 44000 HZ is the minimum standard for a preservation format. Higher bit depth and sampling frequencies may be desirable: "Several specific reasons for richer files include: the accurate capture of noise like clicks, pop, and other inaudible information that resides in frequencies higher than 44.1 kHz; desire to communicate inaudible harmonic information that impact perception of sound; ability to record and provide content that, although not necessarily heard, helps listeners understand and hear better space, depth, and instrument location in stereo and surround sound recordings; and to accommodate future user applications." | ||
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Revision as of 14:04, 15 March 2010
Main Page > Documentation > Media type preservation plans > Audio
Significant properties of audio files
Preservation Format
LPCM/WAVE
Access Format
MP3
Normalization tool
FFmpeg
Comments
- Audio files are normalized to WAVE LPCM with a bit depth of 16 bits per sample and a sampling frequency of 48000 HZ.
- Library of Congress considers WAVE LPCM as the "preferred format for sound recordings." Library of Congress Sustainability of Digital Formats: WAVE Audio File Format with LPCM audio
- Florida Digital Archive normalizes audio streams contained in WAVE files to uncompressed PCM(LPCM) with a bit depth of 16 bits per sample. See Preservation action plans: WAVE.
- According to Guidelines for the Creation of Digital Collections: Digitization Best Practices for Audio, Consortium of Academic and Research Libraries in Illinois, 2009, WAVE LPCM with with a bit-depth of 16 bits and a sampling freqency of 44000 HZ is the minimum standard for a preservation format. Higher bit depth and sampling frequencies may be desirable: "Several specific reasons for richer files include: the accurate capture of noise like clicks, pop, and other inaudible information that resides in frequencies higher than 44.1 kHz; desire to communicate inaudible harmonic information that impact perception of sound; ability to record and provide content that, although not necessarily heard, helps listeners understand and hear better space, depth, and instrument location in stereo and surround sound recordings; and to accommodate future user applications."