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Just came across this question while trying to connect a webcam. If the webcam encapsualted audio that is fine. But what if i want to attach a microphone in another location / locations.

Question: How can I record audio using a microphone?

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Yay- Down vote without reason. Must have been for a badge so i forgive you... not! –  ppumkin Jan 16 '13 at 10:07
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There is no microphone input in the Raspberry Pi. Raspberry Pi's sound chip only supports audio output, not input. If you want to record some audio using RPi you will have to use some external microphone device, like USB microphone. Some USB webcameras also have build in microphones so you could use it.

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Note that there's some kind of bug in the USB firmware that prevents it from recording without glitches/overruns for more than about 20 seconds. –  scruss Aug 10 '12 at 13:35
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You can plug Sony Singstar usb microphones into the RPi and record using Audacity. The sound quality is not the best, but it's not too bad and it does work.

P.S. I've found the Sony Eye-Toy usb camera with a mic doesn't work well like this.

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