I'm trying to determine Round-Trip Latency of realtek
built-in audio interface using CEntrance Latency Test Utility
:
To do this it's necessary to connect audio interface output to input using a short 2.5mm audio cable:
The problem is that it gives inconsistent results (15 samples):
5.44, 5.44, 5.44, 48.50, 5.44, 5.44, 5.44, 39.57, 35.76, 5.44, 49.93, 5.44, 5.44, 5.44, 35.19, ...
(in milliseconds)
I've tried various buffer sizes, input sensitivity
levels in the Centrance tool to no avail.
I've also measured latencies for the system using DPC latency checker
and Latency Mon
:
It appears that there is no apparent driver stalls or hiccups in the system.
How to fix this? How to find the source of inconsistency? Is it the tool itself? (is there a better tool?)