Open Access
Table 2
Sources of delay in network audio communication, with typical values for Digital Subscriber Line (DSL) network, and ranges which can typically occur.
| Delay source | Delay | Configuration | Range |
|---|---|---|---|
| Source to mic. | 1 ms | 0.3 m dist. | 1–5 ms |
| A/D conv., USB | 1.5 ms | USB sound card | 0.5–2 ms |
| Block processing | 2 ms | 96 samples/block fs = 48 kHz | 0.25–5 ms |
| Network | 10 ms | <1000 km | 1–20 ms |
| Jitter comp. | 10 ms | Typical for DSL | 5–20 ms |
| Block processing | 2 ms | See above | 0.25–5 ms |
| D/A conv., USB | 1.5 ms | USB sound card | 0.5–2 ms |
| Speaker to ear | 0.1 ms | Headphones | 0.1 ms |
| Total delay | 28.1 ms | 10–50 ms |
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