On Tue, Jan 30, 2024 at 05:02 AM, Dave, N1AI wrote:
The usable volume range is such that there is almost no audio until the volume control reaches a setting of 50+, a reasonably comfortable audio setting of about 86 is required to listen to the sbitx speaker.?
Might be partially due to arecord using 8 bit samples, not much dynamic range to work with.
this was on the SBITX speaker, not the headset, hence the headset is more comfortable to listen to once I can get the volume/gain level right and ideally adjustable, the headset volume is restricted by the amount of gain controlled by the loopback device used to test so headset volume adjusted to max and it was easy enough to listen on 40m SSB earlier today even weak signals were audible in the headset compared to listening on the sbitx speaker which is a good improvement really.
The logical next step (for playback anyway) now is to get the audio out of audioinjectorpi into a separate loopback (maybe the unused spare perhaps) as well as the ones used for digital so as not to upset the digital functions that seem to work well so far but volume control fixed in those, need it to be variable in the new Loopback.
While I can figure out and read code to some extent I am not a programmer, logically, I would probably copy the code that drives loopback 0(hw:1,0) from hw:0,0 and use it to drive loopback 2(would be hw:3:0) so that hw:0,0 plays audio output to both loopbacks at the same time. That way the changes to drive another audio device can be made in isolation related to the new loopback device.
Repeat this process again for the Capture side of things if needed but just focusing on play for now.
I did install gnuradio with a view to trying to draw this but bit of a learning curve :-)
The art of drawing in text? :-)
hw:0,0 >>>>>> Loopback,DEV=0 (hw:1,0) >>>>>>>> Loopback,DEV=1 (hw:1,1)? >>>>>>>>>>> Digital Software input
hw:0,0 >>>>>> Loopback_2,DEV=0 (hw:3,0) >>>>>> Loopback_2,DEV=1 (hw:3,1) >>>>>>>>>> Alternative Audio Device input i.e. USB Headset
Sort of makes sense to me but happy to be corrected
Regards
Paul G0KAO
