Am Dienstag, dem 01.03.2022 um 15:00 +0100 schrieb Martin Kepplinger:
Am Dienstag, dem 01.03.2022 um 13:44 +0000 schrieb Charles Keepax:
On Mon, Feb 07, 2022 at 02:21:29PM +0000, Charles Keepax wrote:
On Mon, Feb 07, 2022 at 11:49:32AM +0100, Martin Kepplinger wrote:
Am Freitag, dem 04.02.2022 um 17:21 +0000 schrieb Charles Keepax:
On Fri, Feb 04, 2022 at 10:43:53AM +0100, Martin Kepplinger wrote:
Volume itself indeed is good now. Recorded voice is very "metallic" and "shallow" if you know what I mean - and distorted when using MAX volume. The gnome audio recorder doesn't show *any* signal in the UI, so that must still be kind of bad - even though I understand recorded voice way better now than before.
My first thought is that the signal is clipping somewhere in the chain. You have a lot of the gaines up very high from when you were trying to working around the low signal level issues.
Can we be clear here on what paths are in play here. Presumably the gnome audio recorder is capturing over the I2S. When you say you can understand the recorded voice way better now, do you mean in the file captured by the gnome audio recorder? Or are you listening to that on another path, like direct to the headphones?
thanks for all the time and help, and sorry for all the wrong amixer output I sent you,
Hey, just wanted to check everything was going ok on this stuff? Did the volume tweaks get things sounding more normal, and any other problems you guys are having?
Thanks, charles
Hi Charles!
that's really nice of you to ask. Sorry for not replying earlier. Mainly cset "name='MIXINR PGA Volume' 0,0" made things much better indeed. I took a break from this then and the issue is still open, here: https://source.puri.sm/Librem5/librem5-base/-/merge_requests/296 or if you want to look at the current ucm file: https://source.puri.sm/Librem5/librem5-base/-/blob/bb48912242dd0db1f35c6de84...
As you know I'm no expert with the codec and this definitely can be improved: When visualizing the signal, it doesn't look "good" yet and the signal strength seems to only go to 50% of the available scale (in the gnome volume setting). Actually I'll talk about this to Guido tomorrow and even though it is kind of usable now, I hope to that we can come up with a profile that we're preliminarliy happy with.
Of course we already use your "Input Mode" control.
thanks,
martin
Hi Charles,
Let me forward the commit message I just did for the ucm settings here, now that I have a *bit* of an overview of the codec:
There are 3 Volume controls for the analog parts, all before the ADC. In order from Jack to ADC, they are:
numid=10,iface=MIXER,name='Capture Volume' ; type=INTEGER,access=rw---R--,values=2,min=0,max=63,step=0 : values=63,63 | dBscale-min=-23.25dB,step=0.75dB,mute=0
"Input PGA Volume Control". 31=0dB. We use 39=+6dB.
numid=7,iface=MIXER,name='MIXINR PGA Volume' ; type=INTEGER,access=rw---R--,values=1,min=0,max=7,step=0 : values=7 | dBrange- rangemin=0,,rangemax=1 | dBscale-min=0.00dB,step=6.00dB,mute=0 rangemin=2,,rangemax=2 | dBscale-min=13.00dB,step=13.00dB,mute=0 rangemin=3,,rangemax=4 | dBscale-min=18.00dB,step=2.00dB,mute=0 rangemin=5,,rangemax=5 | dBscale-min=24.00dB,step=0.00dB,mute=0 rangemin=6,,rangemax=7 | dBscale-min=27.00dB,step=3.00dB,mute=0
"Right input PGA to Right input Boost-Mixer Gain" 0=0dB. we use 1=+3dB.
numid=8,iface=MIXER,name='MIXINR IN3R Volume' ; type=INTEGER,access=rw---R--,values=1,min=0,max=7,step=0 : values=6 | dBscale-min=-15.00dB,step=3.00dB,mute=0
5=0dB. we use 6=+3dB. That's a later amplifier, "Boost-Mixer Gain".
("quotes" are from the datasheet)
Still, the recording sounds pretty good I think, but since gnome sound- recording doesn't visualize the signal waves - whatever that means :) I'll look at the file in audacity or something similar later.
thanks for having a look,
martin