On 06/17/2018 11:54 AM, Bill Somerville wrote: Hi Bill & All,
Many thanks for your interesting explanation, Bill. Considering the matter from my current environment under Fedora 28, this matter seems very complex. There is the sound "card", then the ALSA modules, then pulseaudio, and in some cases the ALSA emulation above pulseaudio. pavucontrol, as a sort of extended audio mixer with additional functions, is only a pulseaudio tool. It has probably no action on ALSA. In pavucontrol, there is the input device level slider, then the recording stream level slider. There is probably a further tool to adjust the level at the lower ALSA level. If I understand well, an ADC itself can only operate in fixed point mode. If a floating point output signal is expected, I think that there should be a switchable attenuator at the input of the ADC, in order to avoid a loss of resolution. I ignore if real sound cards are built in this manner. Finally, it's important that the level of the input signal is at the optimum level so that the ADC can operate at the best possible resolution. My question is: Have the different level sliders any action (attenuation or amplification) on the level of the signal entering the ADC ? A further question: Is there any tool (perhaps in ALSA) which offer the ability to verify and adjust this level at the input of the ADC, to the optimum value ? If my understanding of the matter is wrong, please correct me, please. Best wishes, Claude (DJ0OT) ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot _______________________________________________ wsjt-devel mailing list wsjt-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/wsjt-devel
