Content for TR 26.865 Word version: 18.0.0
6 Physical Design Constraints
6.1 General
6.2 Physical design constraints applicable for IVAS split rendering scenarios
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6 Physical Design Constraints p. 24
6.1 General p. 24
Physical attributes are complexity, memory consumption, algorithmic delay, motion-to-sound latency, bit rate, etc. Different physical design constraints may apply for different immersive audio codecs.
6.2 Physical design constraints applicable for IVAS split rendering scenarios p. 24
The following physical design constraints apply for split rendering solutions involving the IVAS codec:
| Physical attribute | Constraint |
|---|---|
| Complexity of operation in end-rendering lightweight device | The complexity of operation in end-rendering lightweight device shall not exceed 80+(DOF*20) wMOPS. |
| Complexity of operation at capable device/node | The complexity of operation at pre-rendering device/node shall be characterized. |
| Memory footprint of operation in end-rendering lightweight device | The RAM consumption shall not exceed 100+(DOF*50) kWords. The ROM (PROM and table ROM) shall not exceed 150 kWords. |
| Memory footprint of operation at pre-rendering device/node | The memory footprint of operation at pre-rendering device/node shall be characterized. |
| Algorithmic motion-to-sound latency in head-tracked rendering operation | 0-DOF: no constraint
1-DOF:
30 ms for rotations around corrected axis (in post rendering), for other axes no constraints
2-DOF:
30 ms for rotations around corrected axes (in post rendering), for the remaining axis no constraint
3-DOF:
30 ms for rotations around all axes (in post rendering)
|
| Algorithmic audio delay | The total algorithmic end-to-end audio delay including IVAS algorithmic delay shall not exceed 50 ms. |
| Bit rate of coded intermediate representation | The Split Rendering solution should offer 3-DOF operation at multiple bit rates with rate switching support and shall at least offer operation at 768 kbps. For 3-DOF operation, 384 kbps and 512 kbps should be offered in addition to the required 768 kbps. For 1-DOF operation, 256 kbps should be offered. For 0-DOF operation, 256 kbps and even lower bit rates should be offered. For cases with high transmission channel capacities, high bit rate operation modes > 768 kbps may be offered if QoE gains can be demonstrated. |
