Alarm system with variable warning signal

摘要: An alarm system and method for detecting an intruder making impression on the intruder. The operates by a presence of intruder, determining location outputting warning signal perception changing based determined and/or predetermined passage time. provides means audio level gradually so as to give that source is moving toward In preferred embodiment, output over plurality speakers, phase from first speaker changed relative second two dimensionally kind can be time or calculated position effective giving intruders vital beings have detected their intrusion.