The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 30, 1987
Filed:
Oct. 30, 1985
Yoshihiro Michiguchi, Ibaraki, JP;
Kazuo Hiramoto, Hitachi, JP;
Masatsugu Nishi, Katsuta, JP;
Fuminobu Takahashi, Katsuta, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
An object detecting method and apparatus is disclosed and which operates by transmitting a wave toward an object embedded in a medium having a reflective coefficient at its surface, receiving the resultant reflected wave from the object, applying the received signal to a signal processing unit, and displaying the results of signal processing by the signal processing unit on a display unit. The apparatus and method, furthermore, incorporates the means or steps of multiplying the received signal by a reference signal corresponding to the high frequency wave of the radiation energy and with its phase shifted by a controlled amount, so that the frequency of a signal component included in the received signal as a result of wave reflection from the surface of the medium is converted into a frequency which can be removed by a low-pass filter, passing the resultant received signal through the low-pass filter, and applying the output signal of the low-pass filter to the signal processing unit for processing a clear and sharp image reproduction of the object on a display.