Re: New user with an ICUSBAUDIO7D

OK,
arecord -f S16_LE --channels=2 --device="hw:2,0" --rate=44100 junk.wav
does work.  It's not pretty, I have to amplify in Audacity about 40
db.  My coupling capacitor seems to be leaky, I see DC on the waveform
and I get some motorboating.  But I did it twice and both times
worked.  What I did for a signal was just wet a finger and touch the
center conductor of the soundcard input, which captures hum.  I did a
pattern of touching it and not touching it, what I see on the screen
roughly matches what I did.  So I need to build more amplification.

On 7/20/20, chris hermansen <[email protected]> wrote:
> Alan and list,
>
> On Mon, Jul 20, 2020 at 9:45 AM Alan Corey <[email protected]> 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 <[email protected]> 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
>> > <[email protected]> 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
>> >> [email protected]
>> >> 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
>> [email protected]
>> https://lists.sourceforge.net/lists/listinfo/alsa-user
>>
>
>
> --
> Chris Hermansen · clhermansen "at" gmail "dot" com
>
> C'est ma façon de parler.
>


-- 
-------------
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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