Patents Assigned to Bluegrass Electronic
  • Dual pressure change intrusion detector
    Patent number: 5185593
    Abstract: Apparatus utilizing change in pressure condition in an area to be protected to indicate intrusion or change in conditions of the area by means of a pressure detection device to detect pressure waves at low and infrasonic frequencies which includes a pressure transducer sensitive to change in pressure to provide an output signal. In some instances an amplifier is provided to amplify the output signal, a signal conditioning circuit is provided to delay a portion of the signal, and a detector device is provided to detect the signal with a comparator provided to compare the signal with the delayed signal and actuate an alarm.
    Type: Grant
    Filed: June 20, 1991
    Date of Patent: February 9, 1993
    Assignee: Bluegrass Electronics, Inc.
    Inventors: Elden E. DuRand, III, William K. Logsdon
  • Pressure change intrusion detector
    Patent number: 4928085
    Abstract: Apparatus utilizing change in pressure condition in an area to be protected to indicate intrusion or change in conditions of the area by using a pressure detection device to detect pressure waves at low and infrasonic frequencies which includes a pressure transducer sensitive to change in pressure to provide an output signal. In some instances an amplifier is provided to amplify the output signal, a signal conditioning circuit is provided to delay a portion of the signal, and a detector device is provided to detect the signal with a comparator provided to compare the signal with the delayed signal and actuate an alarm.
    Type: Grant
    Filed: May 30, 1989
    Date of Patent: May 22, 1990
    Assignee: Bluegrass Electronics, Inc.
    Inventors: Elden E. DuRand, III, William K. Logsdon
  • Audio signal generator
    Patent number: 4719452
    Abstract: Audio frequency signal generator to generate signals in a selected band of audio frequencies to generate a noise having an amplitude pattern which simulates the noise generated by a selected occurrence which can be utilized for setting the actuation range of an audio actuated alarm device which is capable of discriminating the noise generated by such an occurrence where the generated frequency of the sound and amplitude of the sound waves can be varied selectively to simulate the pattern of the sound waves emanating from the selected occurrence.
    Type: Grant
    Filed: June 20, 1984
    Date of Patent: January 12, 1988
    Assignee: Bluegrass Electronic
    Inventor: William K. Logsdon
  • Sound discriminator tester
    Patent number: 4552022
    Abstract: A device for selecting the proper sensitivity and acceptable background noise level for sound discrimination switches used for detection of selected sounds where the detection device includes peak signal detectors to receive audio voltage generated by the selected sounds and activate an alarm.
    Type: Grant
    Filed: May 10, 1982
    Date of Patent: November 12, 1985
    Assignee: Bluegrass Electronics Inc.
    Inventor: Elden E. DuRand, III