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. 25, 1995
Filed:
Apr. 14, 1992
Hiroyuki Saito, Katsuta, JP;
Masahiro Kusano, Zama, JP;
Nissan Motor Co., Ltd., Yokohama, JP;
Abstract
A system for reducing a closed sound generated by propagation of vibrations into a limited space such as a vehicular compartment using at least one microphone and at least one speaker. In the closed sound reducing system, a volatile memory such as a RAM is installed for storing a measured newest value of a vibration propagation transfer function cfm(j) and a non-volatile memory such as a ROM is installed for storing a standard value of the vibration propagation transfer function. When the stored data of the volatile memory is erased, the standard value stored in the non-volatile memory is used in place of the measured newest value stored in the volatile memory.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile