[hpsdr] Virtual Audio Cable and June Win 10 Update

[Michael Cozzi]

Hi all,

     Is anyone else having problems with VAC and the June windows update?

     Here's a summary of my issues... it looks like a change in Windows:

     These are the issues I can find:

     1. MME crackles. Even in a app to app setting like I use.
     2. DWM is useless and worse than MME
     3. In many apps the ability to kernel stream is unavailable: (Ham
Radio apps and Voicemeeter)
     4. Port Audio appears to not work at all...

     When the problem came up I upgraded to 4.51 from 4.14 which was
also having the problem. After the update I re-installed windows and
installed everything from scratch- same problem persists. DWM is
unusable, and MME causes crackling on a simple app to app connection. I
get crackling (and I'm assuming lost frames) but no report of o-flow or
u-flows. The cables are being interfaced to Amateur radio software
(which has not changed in months)... so my guess it that something has
changed.

     In one of my ham radio apps there is the ability to do resampling
to mitigate some of these types of issues. However is does not solve the
problem.

     If I run with two cables, one side the encoding/decoding app, the
other side the SDR software the same cracking happens.

     The same issues are apparent when interfacing with Voicemeeter
Banana- I've looped audio streams back through to a monitor and have the
same result in all formats.

     From the standpoint of where the problem is: I think it's in the
input side of the Virtual cables. I've monitored each cable and
demodulated the resultant RF from the radio- the same distortion is
present. The distortion is present before the audio is sent to the radio.

     Also tested with HPET on/off and dynamic tick on/off.

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.openhpsdr.org/pipermail/hpsdr-openhpsdr.org/attachments/20180628/f34888c3/attachment.html>