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:
Jul. 19, 1983
Filed:
Jun. 11, 1981
Kenji Shima, Hyogo, JP;
Masahiro Hibino, Hyogo, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
A sound reproducing device particularly adapted for use in the passenger compartment of an automobile and having improved stereo separation and symmetrical frequency characteristics. The device includes a high-pass filter circuit for passing, when a leakage signal occurs, a signal of equal frequency component to the leakage signal, an attenuation circuit for attenuating the level of the signal passed through the filter circuit to the level of the leakage signal, and a phase inverting circuit for inverting the phase of the signal thus attenuated so as to be opposite to that of the leakage signal, thereby to cancel out the leakage signal.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile