Shell script to generate with SoX the famous nokia sms tone (SMS in morse)

nokia_sms_tone.sh

#!/bin/sh

FILENAME="nokia_sms_tone_morse.wav"

# DOT = short bip, 0.1s 
DOT="|sox -n -p synth 0.1 sine 2500 synth 0.1 sine mix 5000 synth 0.1 sine mix 7500"

# DASH = long bip, 0.3s
DASH="|sox -n -p synth 0.3 sine 2500 synth 0.3 sine mix 5000 synth 0.3 sine mix 7500"

# p = short pause, 0.1s (between bips of the same letter)
p="|sox -n -p trim 0 0.1"

# pp = medium pause, 0.3s (between letters)
pp="|sox -n -p trim 0 0.3"

# ppp = long pause, 1s (between words)
ppp="|sox -n -p trim 0 1"

sox --combine concatenate \
"$DOT" "$p" "$DOT" "$p" "$DOT" \
"$pp" \
"$DASH" "$p" "$DASH" \
"$pp" \
"$DOT" "$p" "$DOT" "$p" "$DOT" \
"$ppp" \
"$DOT" "$p" "$DOT" "$p" "$DOT" \
"$pp" \
"$DASH" "$p" "$DASH" \
"$pp" \
"$DOT" "$p" "$DOT" "$p" "$DOT" \
-r 44100 -b 16 $FILENAME vol -15dB