Audio setup

For a number of experiments we will need to manipulate audio signals with the Raspberry Pi. Here we give a few hints on how to get audio to work.

Audio Input

In order to record audio, we need to connect a microphone to the Pi. If you connect a USB mic, you can ensure that the Pi recognizes it by typinglsusb at the command line

pi@raspberrypi ~ $ lsusb
Bus 001 Device 002: ID 0424:9514 Standard Microsystems Corp.
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 001 Device 003: ID 0424:ec00 Standard Microsystems Corp.
Bus 001 Device 004: ID 0000:0538
Bus 001 Device 006: ID 0d8c:013c C-Media Electronics, Inc. CM108 Audio Controller
Bus 001 Device 005: ID 1c4f:0002 SiGma Micro Keyboard TRACER Gamma Ivory

Here we have connected the C-Media USB Microphone.

You can obtain the device details by typing arecord -l

pi@raspberrypi ~ $ arecord -l

​**** List of CAPTURE Hardware Devices ****

card 1: Device [USB PnP Sound Device], device 0: USB Audio [USB Audio]

 Subdevices: 1/1

Subdevice #0: subdevice #0