Communications – electrical: acoustic wave systems and devices – Echo systems – Distance or direction finding
Patent
1989-05-31
1990-01-23
Tarcza, Thomas H.
Communications, electrical: acoustic wave systems and devices
Echo systems
Distance or direction finding
367105, 367138, G01S 1506
Patent
active
048963046
ABSTRACT:
An object detecting system including an ultrasonic transducer element array including first to N-th ultrasonic transducer elements, a first means for intermittently supplying burst driving pulses to the ultrasonic transducer elements at different times in each of successive intermittent periods. Also, the object detecting system includes a second means coupled between each of the first to N-th ultrasonic transducer elements and the first means for applying the burst driving pulses to the first to N-th ultrasonic transducer elements, successively. The second means includes first to N-th delay circuits which delay applying the burst driving pulses to the ultrasonic transducer elements with the first to N-th delay circuits giving different delay time periods, respectively, so that the delay time periods are successively longer in the order from the first delay circuit to the N-th delay circuit and each of the ultrasonic transducer elements is supplied with the burst driving pulse through two kinds of the delay circuits connected in parallel in such a manner that the M-th number of the ultrasonic transducer elements is coupled with the M-th and (N-M+1) th delay circuits, with M being a number from one to N.
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patent: 4152678 (1979-05-01), Shott et al.
patent: 4173007 (1979-10-01), McKeighen et al.
patent: 4180791 (1979-12-01), Tiemann
patent: 4460987 (1984-07-01), Stokes et al.
"Microprocessors and Programmed Logic", Short, Prentice-Hall, Inc., pp. 33, 481-486 (1981).
"Microcomputing Interfacing", Stone, Addison-Wesley Publishing Co., Inc., pp. 68, 69, 214, 215, 226 & 227 (1982).
NEC Corporation
Pihulic Daniel T.
Tarcza Thomas H.
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