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:
Feb. 10, 1981
Filed:
Nov. 21, 1978
Applicant:
Inventor:
Yoshitaka Hashimoto, Chofu, JP;
Assignee:
Sony Corporation, Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
H03H / ; H03H / ;
U.S. Cl.
CPC ...
333166 ; 333 / ; 333 18 ; 333 19 ;
Abstract
An apparatus for cancelling an undesired signal includes a programmable filter in which differential waveforms of a desired signal are superimposed on one another to form a composite signal similar to an undesired signal, a control circuit for detecting a level of the undesired signal to control the gain of a level adjusting circuit of the programmable filter so as to have a value proportional to the undesired signal, and a subtracter for subtracting the composite signal from an input signal.