On 08/11/2018 09:01, Mikael Nousiainen wrote:
I've got a very weird issue with PulseAudio when trying to route audio
from one application (Firefox 64.0b7 (64-bit)) to another one (WSJT-X v1.9.1).
I'm experiencing the same issue with different browsers (Chrome and Chromium
too).
The browser is receiving audio from a radio transceiver through a WebRTC
connection and I'm feeding it to WSJT-X to decode the data in the audio signal.
Hi Mikael,
you are being very optimistic to expect audio delivered from a remote
web SDR receiver will decode reliably in WSJT-X. There are several
factors that are likely to contribute to unreliability. Firstly as you
imply latency in the connection may exceed the allowable time offset for
the mode being decoded. The web link likely uses aggressive and variable
audio compression that will leave artefacts after expansion. Glitches
will occur when latency changes and the stream is re-aligned. It may
also be as simple as rate conversions being applied through the
pulseaudio loopback hookup (the null sinks) that do not respond well in
the presence of the above distortions.
73
Bill
G4WJS.
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