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, Amagasaki, JP;
Masahiro Hibino, Amagasaki, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
A sound reproducing device adapted to be operated in a narrow space such as the passenger compartment of an automobile including a voltage amplifying or attenuating circuit for varying a difference signal between stereophonic right and left signals and a filter circuit. The voltage amplifying or attenuating circuit and filter circuit are provided in a circuit which produces a reverberation effect and an acoustic spreading effect for reproduced sound to decrease the closed-room effect. Each of these circuits is provided with a varible resistor, wherein the listener can vary the reverberation and acoustic spreading effects as desired.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile