Communications: electrical – Systems – Audible signals
Patent
1997-05-13
1999-12-07
Crosland, Donnie L.
Communications: electrical
Systems
Audible signals
340628, 340531, 340566, 367197, G08B 100, G10K 1100
Patent
active
059990899
ABSTRACT:
An alarm system that includes a number of alarm detecting devices wherein each alarm detecting device includes an alarm condition detecting circuit, a secondary alarm activation circuit, and an audible alarm output circuit including an audio oscillator and a speaker; the audible alarm output circuit being responsive to a detecting circuit control output generated by the alarm condition detecting circuit and to a secondary triggering output signal generated by the secondary alarm activation circuit; the secondary alarm activation circuit including a microphone having a microphone output signal, an amplifier circuit in connection with the microphone output signal and generating an amplified output signal, a filter circuit having a filter input in connection with the amplifier output signal generating a filtered output signal in a first predetermined frequency range; a filter signal integrator having an integrator input in connection with the filtered output signal for integrating the filtered signal output and generating an integrated output signal; a reference signal generator having a reference signal output; a comparator circuit having a reference signal input in connection with the reference signal output and a compared signal input in connection with the integrated output signal, and generating the secondary alarm triggering output signal when the compared signal input exceeds the reference signal input.
REFERENCES:
patent: 3936822 (1976-02-01), Hirshberg
patent: 4001805 (1977-01-01), Golke
patent: 4417235 (1983-11-01), Del Grande
patent: 4450436 (1984-05-01), Massa
patent: 4617555 (1986-10-01), Sheiman
patent: 5012223 (1991-04-01), Griebell et al.
patent: 5172093 (1992-12-01), Nose et al.
patent: 5442336 (1995-08-01), Murphy et al.
Breaux Joseph N.
Crosland Donnie L.
LandOfFree
Alarm system does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Alarm system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Alarm system will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-828903