Sound

Notes on Sound and Audio

Master volume

This turns off and on the master volume switch in Linux from the command-line. This is useful for scripting.

amixer sset Master off
amixer sset Master on

Play raw audio

This shows how to play a raw audio byte stream of 44.1 kHz, 16-bit, single channel, unsigned integer. In this example the file, entropy-source.bin, is a binary file of random bytes. Since this is noise it hardly matters how fast the data is played back.

play -t raw -r 44100 -b 16 -c 1 -e unsigned-integer entropy-source.bin