Shell Programming and Scripting

#!/bin/bash
#
# 1KHz.sh
#
# A very simple DEMO crude sinewave generator using the device /dev/audio.
# It is an eight second burst and generates an approximation of a pure sinewave using linear interpolation.
# The "sinewave.raw" file length is 65536 bytes in size...

# Zero the raw file...
> sinewave.raw

# This is the b byte data list for the crude sinewave.
data="\\x0f\\x2d\\x3f\\x2d\\x0f\\x03\\x00\\x03"

# Generate the file as an eight second burst...
for waveform in {0..8191}
do
        printf "$data" >> sinewave.raw
done

# Now play back a single run of the raw data for about eight seconds.
cat sinewave.raw > /dev/audio

# End of 1KHz.sh DEMO...
# Enjoy finding simple solutions to often very simple problems... ;o)