OpenWMS Metadata Guide

Technical Metadata


Section: Sound

Last updated: May 7th, 2009
Name
sound
Schema
AES
Definition
Audio information about a moving image object.

sound has the following components:
  • Subelements:
    • audioDataEncoding
    • channels
    • soundField
    • soundSampling
    • note
Controlled Vocabulary
n/a
Repeatable
N
Name
audioDataEncoding
Label
Sound - Audio Data Encoding
Schema
AES
Definition
Indicates the method used to encode the audio object. Most modern audio files will use PCM encoding. Use for the encoding applied to the original sound element or track placed in a composite video file.
Usage Note
Use for the original encoding of a sound track or element, before it is encoded with one or more video files as a composite video file. All other data elements in "sound" refer to the final sound encoding in the composite video.

A video file may have a sound track encoded as MP3 (MPEG-1, level 3) and spoken word track originally encoded as a WAV file. This is a repeatable data element. Add a separate encoding scheme for each track and explain in a note.
Controlled Vocabulary
free-text
Repeatable
Y
Name
channels
Group Label
Sound - Channels
Schema
AES
Definition
Channel information about audio in a moving image object.

channels has the following components:
  • Subelements:
    • numChannels
    • channelAssignment
Controlled Vocabulary
n/a
Repeatable
N
Name
numChannels
Label
Sound - Channels - Number of Channels
Schema
AES
Definition
The number of audio channels present in the audio object.
Controlled Vocabulary
Positive Integer
Example(s)
A Monaural (mono) audio stream is typically 1 channel, stereo is typically 2.
Repeatable
N
Name
channelAssignment
Label
not applicable; does not appear on form
Schema
AES
Definition
The area of the audio sound stage occupied by the channel, or a non-spatial attribute of the channel (e.g. language).

channelAssignment has the following components:
  • Subelements:
    • channelNumber
    • leftRightPosition
    • frontRearPosition
Controlled Vocabulary
Free text
Repeatable
Y
Name
channelNumber
Label
Sound - Channels - Channel Number
Schema
AES
Definition
A number assigned to a particular channel in order to map it to its position in the audio sound stage (e.g., pan position within the left-right axis). A natural numbering scheme should be applied to the "channelNum" attribute based on the described audio object. For example, when describing a 24-track tape, the first "channelNum" would be 1. In the case of digital file-based audio objects, the first "channelNum" should be 0.
Usage Note
Apply a natural numbering scheme, based on the audio object. Each channel number should be unique.
Controlled Vocabulary
Positive Integer
Example(s)
When describing a 24-track tape, the first channel number should be "1." In the case of digital file-based audio objects, the first channel number should be "0."
Repeatable
N
Name
leftRightPosition
Label
Sound - Channels - Left-Right Position
Schema
rulib
Definition
This is a decimal number indicating the pan position within the audio sound stage that the enclosing stream should normally occupy during audio playback within the left-right axis.
Usage Note
For panning with a single left-right axis (such as in the case of stereo speakers), the position is specified by a linear displacement to the left or right. Positive values shall indicate a displacement to the right (where +100.0 is fully right); negative values shall indicate a displacement to the left (where -100.0 is fully left). A default value of 0.0 shall indicate that the audio is panned to the center.
Controlled Vocabulary
Positive Integer
Repeatable
Y
Name
frontRearPosition
Label
Sound - Channels - Front-Rear Position
Schema
AES
Definition
This is a decimal number indicating the pan position within the audio sound stage that the enclosing stream should normally occupy during audio playback within the front-back axis.
Usage Note
Front-to-rear position shall be specified by linear displacement from the front (0.0) to the rear (200.0). A default value of 0.0 shall indicate that the audio is panned to the front.
Controlled Vocabulary
Positive Integer
Repeatable
Y
Name
soundField
Label
Sound - Sound Field
Schema
rulib
Definition
Indicates aural space arrangement of the sound recording
Controlled Vocabulary
mono; stereo; joint stereo; quadraphonic; 5.1; 7.1; other
Repeatable
N
Name
soundSoundSampling
Group Label
Sound - Sound Sampling
Schema
AES
Definition
Sampling information about audio in a moving image object.

soundSoundSampling has the following components:
  • Subelements:
    • samplingRate
    • soundBitsPerSample
    • soundWordSize


In addition to the above audio attributes, the group on the form that is labeled "Audio Sampling" also includes "numberOfChannels," which is a subelement of element "channels."
Controlled Vocabulary
n/a
Repeatable
N
Name
soundSamplingRate
Label
Sound - Sound Sampling - Sampling Rate
Schema
rulib
Definition
Sampling rate of the master audio file in kHz
Controlled Vocabulary
8 kHz; 11kHz; 21.5kHz; 22.050kHz; 32kHz; 44.096kHz; 44.1kHz; 48kHz; 88.2kHz; 96kHz; 192kHz; other
Repeatable
N
Name
soundBitsPerSample
Label
Sound - Sound Sampling - Sound Bits Per Sample
Schema
METS
Definition
Bit depth, the number of bits per sample.
Controlled Vocabulary
8-bit; 10-bit; 16-bit; 20-bit; 24-bit; 32-bit; 48-bit; other
Repeatable
N
Name
soundWordSize
Label
Sound - Sound Sampling - Word Size
Schema
AES
Definition
Number of bytes used to represent a single audio sample, which generally maps to bits per sample or audio bits per sample.
Controlled Vocabulary
free text
Example(s)
Files with a bit depth of 24 will usually be expressed as a 3-byte word size, however some applications may store 24-bit video in a 4-byte word.
Repeatable
N
Name
note
Label
Sound - Note
Schema
rulib
Definition
Free-text note to explain the sound element(s) in a composite video file. Use, for example, to explain the encoding of multiple sound elements, such as music and spoken word sound tracks or two mono spoken word sound tracks, that have been added to a composite video file before final encoding.
Controlled Vocabulary
free-text
Repeatable
N




 
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