X-Git-Url: http://git.harvie.cz/?a=blobdiff_plain;f=c%2Fgoertzel%2Fdtmf.sh;h=e01571ed3050d484248dbf5a546058f399b2dfa2;hb=cdfd4745d68315dcefbe2ab2f77bb3a1438dd3f3;hp=6c7798e956ce113417a02e114e1738a06065dae9;hpb=59934436c41da5c999a065638d2e951a34110b03;p=mirrors%2FPrograms.git

diff --git a/c/goertzel/dtmf.sh b/c/goertzel/dtmf.sh
index 6c7798e..e01571e 100755
--- a/c/goertzel/dtmf.sh
+++ b/c/goertzel/dtmf.sh
@@ -1,11 +1,14 @@
 #!/bin/bash
 #This is sample implementation of DTMF decoder using my C implementation of Goertzel Algorithm
 #This is not very efficient or precise, it's just proof of concept
+#Note that it's also quite tricky (but not imposible) to detect DTMF using microphone
+#You will probably need to tune treshold and mixer settings a bit...
+#I've had best results using dtmfdial (Linux software) and two soundcards connected directly using cable
 #Usage example: arecord 2>/dev/null | ./dtmf.sh
 
-tresh=3
+tresh=10
 last='';
-./goertzel -i -q -r 8000 -s 400 -t $tresh -f 697 -f 770 -f 852 -f 941 -f 1209 -f 1336 -f 1477 -f 1633 | while read line; do
+./goertzel -n B -q -l c -r 8000 -d 20 -t $tresh -f 697 -f 770 -f 852 -f 941 -f 1209 -f 1336 -f 1477 -f 1633 $@ | while read line; do
 	#echo "$line";
 
 	#Get time
@@ -21,16 +24,6 @@ last='';
 	g="$(echo "$line" | cut -f 8)";
 	h="$(echo "$line" | cut -f 9)";
 
-	#Compare values to treshold
-	test $a -gt $tresh && a=true || a=false
-	test $b -gt $tresh && b=true || b=false
-	test $c -gt $tresh && c=true || c=false
-	test $d -gt $tresh && d=true || d=false
-	test $e -gt $tresh && e=true || e=false
-	test $f -gt $tresh && f=true || f=false
-	test $g -gt $tresh && g=true || g=false
-	test $h -gt $tresh && h=true || h=false
-
 	#echo "$pos: $a $b $c $d $e $f $g $h";
 	state="$a$b$c$d$e$f$g$h";