IEC 62574-2020 pdf free download – Audio, video and multimedia systems – General channel assignment of multichannel audio.
This document specifies the general channel assignment and the metadata for multichannelaudio format. This document, with its channel mapping and labelling content, provides the unified usage of channel assignments for source devices, digital audio interfaces and sink devices. Thegeneral channel assignment excludes the specification of the exact position of each loudspeaker.
The metadata has the exact position of each loudspeaker;however，since the position of theloudspeaker is different in various surround sound formats, the position information of themetadata is not standardized. It is aimed at consumer applications; it is not targeted at theatrical
environments. Up to 65 labels for loudspeaker positions and 15 labels for loudspeakers on thedisplay are specified,which can be used for all current multichannel audio formats. The channel
assignment concept is room centric and listener centric. This general channel assignmentspecifies the position of the loudspeaker as seen from the listener.
2Normative reference
There are no normative references in this document.
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
lsO and lEC maintain terminological databases for use in standardization at the followingaddresses:
.IEC Electropedia: available at http:.//www.electropedia.orgl
. Iso Online browsing platform: available at http://www.iso.orglobp
3.1
overhead layer
loudspeaker-layer located vertically above the high layer，nominally near or on the celling(overhead), labelled beginning with the letter designation “Oh”
3.2
high layer
loudspeaker-layer located vertically below the overhead layer and above the middle layer,nominally located above the screen，or near the ceiling，labelled beginning with the letterdesignation “H”
3.3
middle layer
loudspeaker-layer located nominally in the vertical plane at height of the listeners ears， oralternatively at the centre of the screen, whose labels do not carry a letter designation
3.4
bottom layer
loudspeaker-layer located nominally below the screen, or near the floor, labelled beginning withthe letter designation “Bt”
3.5
front left
FL
loudspeaker position located at the front left in the middle layer
Note 1 to entry: This note applies to the French language only.
3.6
front right
FR
loudspeaker position located at the front right in the middle layer
Note 1 to entry: This note applies to the French language only.
3.7
front centre
FC
loudspeaker position located at frontal centre in the middle layer, or alternatively corresponding
to the centre of the screen, as viewed from the seating area
Note 1 to entry: This note applies to the French language only.
3.8
low-frequency effects
LFE
sound effects in the low-frequency band, generally below 120 Hz; the LFE channel is not used
as a subwoofer channel to compensate for the low-frequency band of each loudspeaker
Note 1 to entry: When mono LFE is used, it is conveyed in the LFE channel and the LFE loudspeaker’s position at
the bottom layer is not defined.
Note 2 to entry: This note applies to the French language only.
3.9
left surround
LS
loudspeaker position located at the left side slightly behind the listener in the middle layer
Note 1 to entry: This note applies to the French language only.
3.10
right surround
RS
loudspeaker position located at the right side slightly behind the listener in the middle layer
Note 1 to entry: This note applies to the French language only.
3.11
front left centre
FLc
loudspeaker position located at the front left of centre in the middle layer
Note 1 to entry: This note applies to the French language only.
3.12
front right centre
FRc
loudspeaker position located at the front right of centre in the middle layer
Note 1 to entry: This note applies to the French language only.IEC 62574 pdf download.