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. 08, 1980
Filed:
Jul. 10, 1978
Nobuhisa Atoji, Kadoma, JP;
Takashi Matsumoto, Kadoma, JP;
Shoichi Kusumoto, Kadoma, JP;
Kazue Sato, Kadoma, JP;
Mitsuhiro Hasegawa, Kadoma, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
A headphone is designed to have two resonant peaks for simulating loudspeaker reproduction. The headphone comprises a housing in which an electroacoustic transducer with a diaphragm is positioned, wherein the housing is formed with a rearward cavity positioned adjacent to the diaphragm remote from the listener's ear to provide an acoustic compliance to the generated acoustic energy. In order to generate the two resonant peaks to simulate a sensation of realism as if the listener is hearing sound from a loudspeaker, the rearward cavity is communicated with the atmosphere through apertures. The acoustic compliance of the rearward cavity coacts with the apertures to produce two resonant peaks at frequencies corresponding to the frequencies of the peaks which occur in a signal from the loudspeaker.