SECURITY AND INTRUSION MONITORING SYSTEM AND METHOD BASED ON VARIATION DETECTION OF SOUND TRANSFER FUNCTION

摘要

PURPOSE: A low power security monitoring system with the variation measurement of sound transmission property and a method thereof are provided to reduce noise pollution using sine wave signals or melody type signals having pink noise, white noise, or fixed frequency band. CONSTITUTION: A transfer function of a space is saved as standard transfer function information(S102). In a monitoring mode, the size of sound pressure created from a sound source is set up as a minimum size under low power/low noise modes(S104). Invasion is doubted by outside noise(S106). A monitoring function is performed when a low power/low noise mode is converted into a high reliable monitoring mode(S108). The invasion is checked in the high reliable monitoring mode(S110). A second security system such as an alarm and a monitoring camera is operated(S112,S114).