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Subject Measurement data and additiona tests

Date Fri Sep 20 2002 17:05
Author Boris Balin (boris.balin@gmx.de)

File: RME-Digiface.zip

Hi Lars,
enclosed you will find several wmb files related to my tests of teday.
My setup : Looped Soundcard (both channels), 44.1 kHz
Mode "Only if synched" and "Detect start" will give
31, 41 and 50 samples delay (using 13,14 and 15 bit MLS signals). These values are too low.
Mode "Loopback with/without endcheck" will give :
a) 13 bit MLS : IR at 0 and 8190 samples (wrap around ?)
b) 14 bit MLS : IR at 0 and 16382 samples alternating with an IR at 14337 samples (changes every other measurement !)
c) 15 bit MLS : IR at 0 and 32766 samples alternating with an IR at 30721 samples (changes every other measurement !)

Mode "Soundcard is synched, offset=0" will give 126 samples stable delay (realistic value).
So this should be a good platform for working, BUT :
When I change mode from "Loopback" to "Synched" after having the IR at 0+16382, the "Synched" mode gives false results, i.e. IR at 14459 samples.
If I tell you that the buffer size of the RME card is set to 2048, you may start interesting computations.
The effect is : I think that I know how to avoid the problems, but there seems to be a problem somewhere in the driver communication between WinMLS and RME.

Best regards

Boris Balin

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