Sound Card

	USB 2.0 3D Soundkarte	Sound card Audio Adapter 5.1	1€	LINK

Extending the Raspi with a microphone

I don’t know how one can earn money with this - the sound card costs 1€ and ships for free :). It works great with the Raspi and extends it with a microphone in.

lsusb

Bus 001 Device 007: ID 0d8c:013c C-Media Electronics, Inc. CM108 Audio Controller

Tools

sudo apt-get install alsa-tools alsa-oss alsa-utils

cat /proc/asound/cards

0 [ALSA           ]: BRCM bcm2835 ALSbcm2835 ALSA - bcm2835 ALSA
                      bcm2835 ALSA
 1 [Device         ]: USB-Audio - USB PnP Sound Device
                      C-Media Electronics Inc. USB PnP Sound Device at usb-bcm2708_usb-1.2, full spee

Change default device

sudo vim ~/.asoundrc

pcm.!default {
   type plug
   slave.pcm {
     @func getenv
     vars [ ALSAPCM ]
     default "hw:0,1"
   }
 }

alsamixer + F3 - adjust volume

Play Audio

aplay numnuts.wav

Text to Speech (TTS)

sudo apt-get install festival

echo "test" | festival --tts

German voice

http://www.ims.uni-stuttgart.de/institut/arbeitsgruppen/phonetik/synthesis/festival_opensource.html