Communications – electrical: acoustic wave systems and devices – Echo systems – Returned signal used for control
Patent
1990-10-31
1991-09-03
Pihulic, Daniel T.
Communications, electrical: acoustic wave systems and devices
Echo systems
Returned signal used for control
367127, 367900, 367907, G01S 1500, G01S 380, G08C 2100
Patent
active
050460536
ABSTRACT:
An acoustic signal receiving and processing circuit provides an output signal that enables a distance to be determined between a transmitter and a sensor. The circuit comprises a sensor which receives both noise and acoustic position signals, the acoustic signals arriving after a time delay indicative of distance between the signal's transmitter and a sensor. A level control circuit provides a plurality of output potentials, one of which is a ramp signal and another is a neutral voltage, the ramp signal produced in response to a start signal manifestation. A comparator circuit, has a pair of inputs connected to the level control and sensor circuits, respectively. The comparator circuit produces a first output signal in response to a potential on one of its inputs exceeding a potential on another of its inputs, i.e. when a voltage transition of a received acoustic signal initially passes a voltage manifested by the ramp signal. A signal detection circuit is responsive to the first output signal from the comparator circuit to cause the level control circuit to apply the neutral voltage to the comparator circuit. The comparator circuit then produces a second output signal upon a subsequent transition of the received acoustic signal past the neutral voltage, resulting in a "zero crossing" detection of the received signal. A further circuit is responsive to a start signal to commence an interval manifestation and to a detection of the second output signal to terminate the interval manifestation, whereby the interval manifestation is indicative of the distance between the transmitter and sensor.
REFERENCES:
patent: 4315325 (1989-02-01), Blades
Cyber Scientific
Pihulic Daniel T.
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