Communications – electrical: acoustic wave systems and devices – Plural transmitters to receiver or transmitter to plural...
Patent
1989-06-16
1990-09-04
Tarcza, Thomas H.
Communications, electrical: acoustic wave systems and devices
Plural transmitters to receiver or transmitter to plural...
367900, 367901, 367910, G01S 1588
Patent
active
049550004
ABSTRACT:
An ultrasonic system for identifying the location of personnel within a multiple room complex. The system includes ultrasonic transmitters adapted to be transported by the personnel. The transmitters periodically transmit pulse code modulated (PCM) transmitter signals representative of a digital code sequence characteristic of the person, and formed by a plurality of bit positions which are separated from adjacent bit positions by predetermined time intervals. Ultrasonic receivers for receiving the transmitter signals are positioned within each room of the complex. The receivers detect bits of the code sequence only during window periods corresponding to expected bit positions. Detected code sequences are compared to predetermined code sequences, and receiver signals are produced as a function of the comparison. A central station is coupled to receive the receiver signals, and provides a visual indication of the rooms in which the persons transporting the transmitters are located.
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"Intro to Communication Systems", Addison-Wesley Publishing Company Ferrel Stremmler, Dec. 1982 pp. 383-403.
NAC Engineering and Marketing, Inc.
Swann Tod
Tarcza Thomas H.
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