Re: Help with USB audio card

[deloptes <deloptes@gmail.com>]

Rodolfo Medina wrote:

> Hi all.
> 
> I just bought an external USB audio card.  I plugged it into the USB port
> of my
> PC and plugged a 3.5mm jack microphone into the `mic' input of the card. 
> It is shown in lsusb:
> 
> $ lsusb
> Bus 002 Device 005: ID 17ef:602e Lenovo
> Bus 002 Device 003: ID 046d:c312 Logitech, Inc. DeLuxe 250 Keyboard
> Bus 002 Device 002: ID 0438:7900 Advanced Micro Devices, Inc.
> Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
> Bus 001 Device 010: ID 0d8c:013c C-Media Electronics, Inc. CM108 Audio
> Controlle Bus 001 Device 003: ID 0bda:0129 Realtek Semiconductor Corp.
> RTS5129 Card Reader Bus 001 Device 002: ID 0438:7900 Advanced Micro
> Devices, Inc. Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root
> hub Bus 004 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
> Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
> 
> 
> and also in arecord:
> 
> $ arecord --list-devices
> **** List of CAPTURE Hardware Devices ****
> card 1: Generic [HD-Audio Generic], device 0: ALC662 rev3 Analog [ALC662
> rev3 Analog]
>   Subdevices: 0/1
>   Subdevice #0: subdevice #0
> card 1: Generic [HD-Audio Generic], device 2: ALC662 rev3 Alt Analog
> [ALC662 rev3 Alt Analog]
>   Subdevices: 1/1
>   Subdevice #0: subdevice #0
> card 2: Device [USB PnP Sound Device], device 0: USB Audio [USB Audio]
>   Subdevices: 1/1
>   Subdevice #0: subdevice #0
> 
> Besides, I ran alsamixer, selected the USB card and unmuted everything. 
> But
> then, when I try to record, no sound is recorded.  I do:
> 
>  $ sox -t alsa hw:2,0 output.wav
> 
> , or
> 
>  $ arecord -f S16_LE -D hw:2,0 -r 96000 test.wav
> 
> , or also within Audacity.  But nothing, my voice is not recorded.  Please
> help whoever can.
> 
> Thanks,
> 
> Rodolfo


A short howto I wrote years ago

1) find out cards and inputs

shell> cat /proc/asound/cards
 0 [Intel          ]: HDA-Intel - HDA Intel
                      HDA Intel at 0xff950000 irq 22
 1 [HVR900         ]: USB-Audio - WinTV HVR-900
                      WinTV HVR-900 at usb-0000:00:1a.7-3, high speed
 2 [Webcam         ]: USB-Audio - Philips SPC 1000NC Webcam
                      Philips CE Philips SPC 1000NC Webcam at
usb-0000:00:1a.7-5.4, high speed

=> I'm going to use the Webcam built in mic => card # 2

2) find out the input

shell> cat /proc/asound/devices
  0: [ 0]   : control
  1:        : sequencer
  6: [ 0- 2]: hardware dependent
  7: [ 0- 3]: hardware dependent
 16: [ 0- 0]: digital audio playback
 17: [ 0- 1]: digital audio playback
 19: [ 0- 3]: digital audio playback
 24: [ 0- 0]: digital audio capture
 32: [ 1]   : control
 33:        : timer
 56: [ 1- 0]: digital audio capture
 64: [ 2]   : control
 88: [ 2- 0]: digital audio capture

=> my input is the capture on the second card

 88: [ 2- 0]: digital audio capture

3) so no we can test the mic

shell> arecord -c1 -Dplughw:2,0 -f cd -vv /dev/null


regards