B.2 Example loudspeaker array
26.2603GPPObjective test methodologies for the evaluation of immersive audio systemsRelease 18TS
An example implementation with an ambisonic order N = 29 is described below:
– A turn table with constant step size of 6 degrees and starting at 0 degree (to obtain 60 positions in azimuth).
– Two fixed semi-arcs of radius 2.5 meters separated in azimuth by 90 degrees with 15 loudspeakers on each semi-arc; the elevations of loudspeakers are given (in degrees) by -85, -80, -74, -68, -62, -56, -50, -44, -38, -32, -27, -21, -15, -9, -3, 3, 9, 15, 21, 27, 32, 38, 44, 50, 56, 62, 68, 74, 80, 85, where succesive values are alternatively allocated to each semi-arc.
NOTE: In practice, the elevation of -85 degrees may be replaced by a nearby value (e.g. -82 degrees) to leave room for the mounting structure at the bottom of the loudspeaker array.
Annex C (informative):
Change history
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Change history |
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Date |
Meeting |
TDoc |
CR |
Rev |
Cat |
Subject/Comment |
New version |
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2018-09 |
SA-81 |
SP-180644 |
Presented to TSG SA#81 for approval |
1.0.0 |
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2018-09 |
SA-81 |
Approved at TSG SA#81 |
15.0.0 |
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2018-12 |
SA-82 |
SP-180969 |
0001 |
2 |
Corrections to test method with loudspeaker array and turn table |
15.1.0 |
|
|
2020-03 |
SA-87-e |
SP-200105 |
002 |
1 |
F |
Correction of sensitivity calculation for immersive audio playback |
15.2.0 |
|
2020-07 |
– |
– |
– |
– |
– |
Update to Rel-16 version (MCC) |
16.0.0 |
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2022-04 |
– |
– |
– |
– |
– |
Update to Rel-17 version (MCC) |
17.0.0 |
|
2022-12 |
SA-98-e |
SP-221058 |
0004 |
2 |
D |
Corrections to TS 26.260 Clause 4 |
18.0.0 |