Communications – electrical: acoustic wave systems and devices – Echo systems – Returned signal used for control
Patent
1987-08-19
1989-08-22
Tarcza, Thomas H.
Communications, electrical: acoustic wave systems and devices
Echo systems
Returned signal used for control
367103, G01S 1514
Patent
active
048602663
ABSTRACT:
A transmitting/receiving circuit for an acoustic transducer (W1, W2) wherein the transmitting transducer (W1) is sequentially controlled by different modulated carrier frequencies (f1, f2), where the control is first matched to the inherent frequency (f1) of the transducer (W1) and afterwards the control of the transducer (W1) is by a frequency (f2) outside of the inherent frequency. During a signal reception by the receiving transducer (W2), a lock-out of a phase-locking circuit (PLL) is detected, where with an object to be measured is in a near range an active lock-out due to the frequency shift of the reception signal outside a frequency bandwidth of the phase-locking circuit is detected, and where with an object to be measured is in a far range, a passive lock-out is detected due to the fact that the reception signal amplitude falls below a noise level.
REFERENCES:
patent: 2818505 (1957-12-01), Keine
patent: 4282452 (1981-08-01), Hassler et al.
patent: 4376990 (1983-03-01), Metchev
patent: 4464738 (1984-08-01), Czaykowski
patent: 4654833 (1987-03-01), Drefahl
patent: 4672330 (1987-06-01), Floyd et al.
patent: 4724437 (1988-02-01), Jones et al.
Halista Mitchell J.
Honeywell Regelsysteme GmbH
Medved Albin
Swann Tod
Tarcza Thomas H.
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