Coded acoustic alarm transmitter/receiver system
First Claim
1. A personal acoustic alarm unit having means for providing an audible alarm signal in the audio range comprising a first transmitter means including a first signal generating means for simultaneously generating a plurality of individual sonic signals in the audio frequency range, each such audio range sonic signal having an audio frequency which differs from that of the remaining audio range sonic signals, first code generator means connected to receive at least one of said individual audio range sonic signals and operating to apply a unique code thereto, and means for transmitting said audio range sonic signals simultaneously as an audible alarm signal;
- andmeans for providing a silent alarm signal outside of the audio range comprising a second transmitter means including a second signal generating means for simultaneously producing a plurality of individual sonic signals in the inaudible frequency range, each such inaudible range sonic signal having an audio frequency that differs from that of the remaining inaudible range sonic signals, second code generating means connected to receive at least one of said individual inaudible range sonic signals and operating to apply a unique code thereto, and second means for transmitting said inaudible range sonic signals simultaneously as a silent alarm signal; and
actuating means for initiating operation of said first and second signal generating means.
1 Assignment
0 Petitions
Accused Products
Abstract
The coded acoustic alarm transmitter/receiver system includes a transmitter for selectively providing both an audible alarm in the audio frequency range and a silent alarm in the ultrasonic frequency range. These alarm signals may be provided by a plurality of signals of different frequencies transmitted simultaneously in either the audio or ultrasonic frequency ranges. Receiver units are tuned to receive specific frequencies from a specific transmitter or group of transmitters.
71 Citations
11 Claims
-
1. A personal acoustic alarm unit having means for providing an audible alarm signal in the audio range comprising a first transmitter means including a first signal generating means for simultaneously generating a plurality of individual sonic signals in the audio frequency range, each such audio range sonic signal having an audio frequency which differs from that of the remaining audio range sonic signals, first code generator means connected to receive at least one of said individual audio range sonic signals and operating to apply a unique code thereto, and means for transmitting said audio range sonic signals simultaneously as an audible alarm signal;
- and
means for providing a silent alarm signal outside of the audio range comprising a second transmitter means including a second signal generating means for simultaneously producing a plurality of individual sonic signals in the inaudible frequency range, each such inaudible range sonic signal having an audio frequency that differs from that of the remaining inaudible range sonic signals, second code generating means connected to receive at least one of said individual inaudible range sonic signals and operating to apply a unique code thereto, and second means for transmitting said inaudible range sonic signals simultaneously as a silent alarm signal; and
actuating means for initiating operation of said first and second signal generating means. - View Dependent Claims (2, 3, 4)
- and
- 5. An alarm system for protection of electronic equipment comprising a plurality of condition sensing transducer means each providing a respective signal in response to existence of a predetermined condition of the equipment, transmitter means operatively associated with the condition sensing transducer means, said transmitter means being activated by receipt of a condition responsive signal from any transducer means for transmitting an alarm signal, said transmitter means being provided with a first signal generating means for generating an acoustic signal in the audio frequency range and second signal generating means for generating an acoustic signal in the ultrasonic frequency range, at least one of said condition sensing transducer means being operable to activate the first signal generating means and at least one other of said sensing transducer means being operable to activate the second signal generating means.
Specification