
U.S.
Patent
Jan.
30,
2007
Sheet
3
0f
13
US
7,170,404
B2
SECURITY
ALARM
MONITORING
UNIT
/‘42
f
40
MICROPHONE
p8
(((U?c
DEQIQEIAS)
ANALOG
TO
//-\
12
DIGITAL
/“
38
CONVERTER
DIGITAL
SIGNAL
/_\
PROCESSING
/
14
MEMORY
/”‘
22,24
ALARM
DISTINGUISHING
/
MEANS
ALARM
/
MESSAGE
STATION
/
CORRELATING
MEANS
[
32
COMMUNICATION
_
_
_
__________
_
__
_
_
RECEIVING
PORT
SITE
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