Patent ID: 9024748
Filing Date: 2015-05-05
Classification: G08B

Abstract:
1. An apparatus for detecting a presence of a sound of an acoustic device, the apparatus comprising: a. at least one sensor, capable of receiving the sound of the acoustic device and converting the sound to an electrical signal; b. a signal processor capable of identifying the particular sound pattern of the acoustic device; and c. an indicium of the detection of the acoustic device; wherein the signal processor performs the mathematical function of cross-correlation between two inputs, the first input being the electrical signal from the sensor, and the second input being a pre-determined reference pattern of the particular sound pattern of the acoustic device; and wherein the sound pattern of the acoustic device is based on a swept-frequency technique selected from the group consisting of: a linear frequency modulation chirp, a non-linear frequency modulation chirp, a linear period modulation chirp, a discrete linear period modulation chirp, and a nonlinear period modulation chirp.