OpenMIC Metadata Guide

Technical Metadata


Section: Sound Qualities

Last updated: April 6th, 2009
Name
soundQualities
Schema
AES
Definition
Sound Qualities describe the characteristics of the sound, such as mono or stereo, track layout, etc.

soundQualities has the following components:
  • Subelements:
    • channels
    • soundField
    • noiseReduction
    • equalization
Repeatable
N
Name
channels
Group Label
Sound Qualities - Channels
Schema
AES
Definition
Channel information about audio in a moving image object.

audioChannels has the following components:
  • Subelements:
    • numChannels
    • channelAssignment
Controlled Vocabulary
n/a
Repeatable
N
Name
numChannels
Label
Sound Qualities - Channels - Number of Channels
Schema
AES
Definition
The number of audio channels present in the audio object.
Controlled Vocabulary
Postive 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 Qualities - 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 channelNumber based on the described audio object. For example, when describing a 24-track tape, the first channelNumber would be 1. In the case of digital file-based audio objects, the first channelNumber 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
Y
Name
leftRightPosition
Label
Sound Qualities - Channels - Left-Right 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 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 Qualities - 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 Qualities - Sound Field
Schema
AES
Definition
Indicates aural space arrangement of the sound recording
Controlled Vocabulary
mono; stereo; joint stereo; quadraphonic; 5.1; 7.1; other
Repeatable
N
Name
noiseReduction
Label
Sound Qualities - Noise Reduction
Schema
AES
Definition
The noiseReduction element shall be used to indicate any inherent noise reduction processing that must be applied to the described audio object during playback to properly recover the recorded sound. This element shall not be used to describe de-noising operations that may have been applied to the audio object. If no noise reduction decoding is necessary for proper playback of the described audio object, then the noiseReduction element shall be omitted.
Controlled Vocabulary
Free Text
Repeatable
N
Name
equalization
Label
Sound Qualities - Equalization
Schema
AES
Definition
The equalization element shall be used to indicate any inherent equalization curve that must be applied to the described audio object during playback to properly recover the recorded sound. Where possible, this information should be given by its internationally recognized standard name. If no equalization is required for proper playback of the described audio object, then the equalization element shall be omitted.
Controlled Vocabulary
Free Text
Repeatable
N




 
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