Alan and list, On Mon, Jul 20, 2020 at 9:45 AM Alan Corey <alan01...@gmail.com> wrote:
> When I do > arecord -f S16_LE --channels=2 --device="hw:2,0" --rate=44100 junk.wav > > It doesn't complain but the recording is silence. Something may be > turned down or off in the mixer. Or I'm recording the wrong > subdevice. hw:2,1 and hw:2,2 don't seem to be found. If I amplify > (40 db) in Audacity there's not really anything there. > Alan have you tried running "alsamixer" in a terminal window and inspecting the settings? > > I'm using a bare electret cartridge with a 3.9 k resistor from 4.2 > volts in from a lithium cell, and a 1 MFD coupling cap. I'd expect to > see something when I tap on it, but nothing. > Do you have a voltmeter to watch what happens on the output of the capacitor and ground when you tap? > > > On 7/20/20, Alan Corey <alan01...@gmail.com> wrote: > > Hmm, none of these are 1 channel. I do want 2 channels but so far > > I've got 1 electret cartridge on prototype board trying to figure out > > how much amplification I need. > > > > USB Sound Device at usb-3f980000.usb-1.5, full speed : USB Audio > > > > Playback: > > Status: Stop > > Interface 1 > > Altset 1 > > Format: S16_LE > > Channels: 8 > > Endpoint: 6 OUT (ADAPTIVE) > > Rates: 44100, 48000 > > Interface 1 > > Altset 2 > > Format: S16_LE > > Channels: 2 > > Endpoint: 6 OUT (ADAPTIVE) > > Rates: 44100, 48000 > > Interface 1 > > Altset 3 > > Format: S16_LE > > Channels: 4 > > Endpoint: 6 OUT (ADAPTIVE) > > Rates: 44100, 48000 > > Interface 1 > > Altset 4 > > Format: S16_LE > > Channels: 6 > > Endpoint: 6 OUT (ADAPTIVE) > > Rates: 44100, 48000 > > Interface 1 > > Altset 5 > > Format: S16_LE > > Channels: 2 > > Endpoint: 6 OUT (ADAPTIVE) > > Rates: 96000 > > > > Capture: > > Status: Stop > > Interface 2 > > Altset 1 > > Format: S16_LE > > Channels: 2 > > Endpoint: 5 IN (ASYNC) > > Rates: 44100, 48000 > > > > > > > > On 7/20/20, Clemens Ladisch via Alsa-user > > <alsa-user@lists.sourceforge.net> wrote: > >> Alan Corey wrote: > >>> arecord -f S16_LE -d 10 -r 16000 --channels=1 --device="hw:2,0" > >>> /tmp/test-mic.wav > >>> Recording WAVE '/tmp/test-mic.wav' : Signed 16 bit Little Endian, Rate > >>> 16000 Hz, Mono > >>> arecord: set_params:1345: Channels count non available > >> > >> I suspect recording always uses channels. > >> Please show the contents of /proc/asound/card2/stream0. > >> > >> > >> Regards, > >> Clemens > >> > >> > >> _______________________________________________ > >> Alsa-user mailing list > >> Alsa-user@lists.sourceforge.net > >> https://lists.sourceforge.net/lists/listinfo/alsa-user > >> > > > > > > -- > > ------------- > > No, I won't call it "climate change", do you have a "reality problem"? - > > AB1JX > > Cities are cages built to contain excess people and keep them from > > cluttering up nature. > > Impeach Impeach Impeach Impeach Impeach Impeach Impeach Impeach > > > > > -- > ------------- > No, I won't call it "climate change", do you have a "reality problem"? - > AB1JX > Cities are cages built to contain excess people and keep them from > cluttering up nature. > Impeach Impeach Impeach Impeach Impeach Impeach Impeach Impeach > > > _______________________________________________ > Alsa-user mailing list > Alsa-user@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/alsa-user > -- Chris Hermansen · clhermansen "at" gmail "dot" com C'est ma façon de parler.
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