Difference between revisions of "AudioIn"
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| + | To test, you might use something like this; it records for two seconds and then plays back the recorded sound. | ||
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| + | $ arecord -d 2 -f cd -t wav foobar.wav;aplay foobar.wav | ||
| + | </code> | ||
[[Category:How_to_-_audio]] | [[Category:How_to_-_audio]] | ||
Revision as of 11:25, 9 December 2010
Some Overo expansion boards provide a standard Audio Out and an Audio Line-in. Without a pre-amplifier, plugging a microphone into this Line-In port just won't work.
To use a microphone with the Overo, connect a microphone to the Mic-in lines available on the Overo connectors (and broken out on the pin headers of some boards). In addition, you need to be using a kernel that is more recent that 25 Sept. 2010 (see here for recent pre-built images.
Capture Interface Settings
The audio Line-in uses the 'Analog Right AUXR' and the 'Analog Left AUXL' lines; the Mic-in uses the 'Analog Left Main Mic' and the 'Analog Right Sub Mic' lines. Use amixer or alsamixer to select the correct capture interface for your application.
Currently, Line-in is selected as the default capture interface. You could switch to the Mic-in interface like this:
$ amixer -c 0 sset 'Analog Right AUXR' nocap $ amixer -c 0 sset 'Analog Left AUXL' nocap $ amixer -c 0 sset 'Analog Left Main Mic' cap $ amixer -c 0 sset 'Analog Right Sub Mic' cap
To test, you might use something like this; it records for two seconds and then plays back the recorded sound.
$ arecord -d 2 -f cd -t wav foobar.wav;aplay foobar.wav
