Communications – electrical: acoustic wave systems and devices – Echo systems – Distance or direction finding
Patent
1985-06-19
1987-06-30
Tarcza, Thomas H.
Communications, electrical: acoustic wave systems and devices
Echo systems
Distance or direction finding
367 97, 367 98, G01S 968, G01S 966
Patent
active
046775994
ABSTRACT:
An ultra-sonic sensor includes a driver circuit outputting a high-frequency driver signal which orders a transmitter to transmit ultra-sonic waves toward a target object. The driver circuit also sends the driver signal to a receiver. The driver signal is superimposed on a receiver signal. The receiver differentiates the receiver signal and compares the differentiated receiver signal level to a threshold level to detect reception of the reflected ultra-sonic wave. The receiver also detects when the transmitter is actively transmitting the ultra-sonic waves toward the object and disables the aforementioned comparison at such times. Accordingly, by comparing the differentiated receiver signal level with the threshold, the influence directly transmitted ultra-sonic waves on detection of the reflected ultra-sonic wave is successfully avoided. In addition, by interrupting the comparison during a period in which the transmitter is transmitting the ultra-sonic waves, the threshold level can be low enough to allow the system to detect the reflected ultra-sonic wave with great sensitivity.
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Kobayashi Hiroshi
Obayashi Hiroaki
Nissan Motor Company Limited
Pihulic Daniel T.
Tarcza Thomas H.
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