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:
Apr. 03, 1990
Filed:
May. 06, 1988
Applicant:
Inventors:
Shinjiro Kato, Saitama, JP;
Toshikazu Yoshimi, Saitama, JP;
Hideo Yamamoto, Saitama, JP;
Takeshi Sato, Saitama, JP;
Hisashi Kihara, Saitama, JP;
Assignee:
Pioneer Electronic Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H04B / ;
U.S. Cl.
CPC ...
381 86 ; 381109 ;
Abstract
A speaker system for a vehicle having both front and rear speakers. Both speakers are connected in parallel to an amplifier. The impedance of the rear speaker circuit is made greater than that of the front speaker circuit. A resistor may be placed in series with the rear speaker or a shorting ring may be attached to the coil of the front speaker to decrease the high frequency impedance.