Patent ID: 7982587
Filing Date: 2011-07-19
Classification: G04C,G08B

Abstract:
1. A method for operating an audible alarm connected to a source of power, the alarm utilizing a microprocessor and accessory selected from a group consisting of a real time clock, an ambient temperature sensor, an ammeter, and a digital radio, the method comprising the steps of: (a) providing communication between the microprocessor and the accessory; (b) receiving a signal from the accessory into the microprocessor; and (c) operating the audible alarm based on the signal received into the microprocessor; wherein the alarm includes a transducer for detecting ambient noise, the method additionally comprising the steps of: (d) detecting ambient noise with the transducer; (e) determining frequency spectrum of an ambient noise signal; and (f) adjusting an alarm output frequency based on the frequency spectrum of the ambient noise signal, wherein adjusting an alarm output frequency based on the frequency spectrum of the ambient noise signal comprises: (g) determining dominant frequencies of the ambient noise frequency spectrum; and (h) setting the alarm output frequency to a frequency at least one-third octave outside any determined dominant frequencies.