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:
Oct. 13, 1981
Filed:
Apr. 23, 1979
Mitsuaki Tanaka, Yokohama, JP;
Hidetsugu Suzuki, Yokohama, JP;
Victor Company of Japan, Limited, Yokohama, JP;
Abstract
According to a first aspect of the invention, a diffraction compensation circuit is employed to relatively raise the level of an input electrical audio signal at low frequencies. A speaker is driven in response to the output signals of the diffraction compensation circuit, thereby offsetting a diffraction characteristic inherent in a speaker enclosure. According to a second aspect of the invention, the radiation surface of the vibrating member of a speaker is made flat. The speaker is installed in an enclosure in such a manner that the flat surface of the vibrating member is flush with the exterior surface of the enclosure, thereby reproducing an audio signal with high fidelity.