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:
Nov. 16, 1993
Filed:
Jan. 28, 1992
Syuichi Mitsutsuka, Kooriyama, JP;
Clarion Co., Ltd., Tokyo, JP;
Abstract
A convolver has a piezoelectric film layer, an insulator layer and a semi-conductor layer. A surface resistance measurement part permits measurement of a surface resistance related to the surface resistance seen by a gate electrode of the convolver. The surface resistance part is changeable by a bias voltage applied to the convolver. The amplitude of the bias voltage is controlled to set the surface resistance at a value which produces a desired convolution efficiency of the convolver. The convolver is adaptable to be fabricated as an integrated circuit with a simple structure. A transmitter/receiver system is disclosed in which a transmitted SSC signal is modulated by a pseudo-noise (PN) signal, as well as by a normal modulation. In the receiver, the PN component of the signal is removed using a convolver according to the present invention, to correlate the received signal before detection thereof.