Configurating ALSA and soundcard

max_mad · 05-14-2008, 03:40 AM

Hello,

recording via MIC does not work. The problem seems to be the basic configuration of hardware.

Starting

alsamixer

within text-console MIC and CAPTURE are on.
Soundhardware seems to be working: I can hear the MIC-signal over speakers.

Trying to record with

arecord -d 10 -f cd -t wav test.wav

I get an empty file.

What is going wrong and how can I fix it?

Thank you

masterclassic · 05-15-2008, 07:11 AM

Quote:

Originally Posted by max_mad

I get an empty file.

Do you mean a file of length 0?
A sound file with silence all over the recording time?

max_mad · 05-15-2008, 09:42 AM

File: 1.7 MB of silence

zeus:~# arecord -d 10 -f cd -t wav test2.wav
Recording WAVE 'test2.wav' : Signed 16 bit Little Endian, Rate 44100 Hz, Stereo

-rw-r--r-- 1 root root 1764044 2008-05-15 16:37 test2.wav

also:

zeus:~# arecord -r 48000 -c 1 | hexdump
Recording WAVE 'stdin' : Unsigned 8 bit, Rate 48000 Hz, Mono
0000000 4952 4646 0024 8000 4157 4556 6d66 2074
0000010 0010 0000 0001 0001 bb80 0000 bb80 0000
0000020 0001 0008 6164 6174 0000 8000 8080 8080
0000030 8080 8080 8080 8080 8080 8080 8080 8080
*
Aborted by signal

max_mad · 05-15-2008, 01:19 PM

ALSAMIXER:

The DAC and ADC have to be set on capture! Whatever DAC means!
Digital-analog-Converter??

masterclassic · 05-18-2008, 02:09 PM

DAC = Digital to analog Converter
ADC = Analog to digital Converter