Alan and list,
On Mon, Jul 20, 2020 at 9:45 AM Alan Corey <alan01346@xxxxxxxxx> 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 <alan01346@xxxxxxxxx> 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@xxxxxxxxxxxxxxxxxxxxx> 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
>>
>>
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>>
>
>
> --
> -------------
> 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
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