Movement-detecting processing circuit for an ultrasonic detectio

Details Movement-detecting processing circuit for an ultrasonic detectio Movement-detecting processing circuit for an ultrasonic detectio

1978-04-17

1980-04-08

Swann, III, Glen R.

Communications, electrical: acoustic wave systems and devices

Echo systems

Presence or movement only detection

340528, 343 5SM, G08B 1318

Patent

active

041975286

ABSTRACT:
A transmitter/receiver supplies echo signals to an amplifying circuit incorporating an attenuator, whereby the circuit has a variable amplification factor tending to compensate for reducing magnitude of the amplitudes of the echo signals with distance of detected objects from the transmitter/receiver. The area of detection is divided into alternate active and inactive zones radiating outwardly from the transmitter/receiver, the amplified echo signals emanating from objects in the active zones during a given operating cycle are integrated and the total output is compared with the corresponding total for the preceding cycle.

REFERENCES:
patent: 3331065 (1967-07-01), McDonald
patent: 3594768 (1971-07-01), Harris et al.
patent: 3659290 (1972-04-01), Bourque
patent: 3846778 (1974-11-01), Galvin et al.
patent: 3967283 (1976-06-01), Clark et al.
patent: 4028690 (1977-06-01), Buckley et al.
patent: 4054871 (1977-10-01), Terrell et al.

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