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. 31, 2000
Filed:
Dec. 23, 1998
Applicant:
Inventors:
Iwao Takiguchi, Kanagawa, JP;
Motoyuki Yoshizumi, Kanagawa, JP;
Assignee:
Sony Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H04R / ;
U.S. Cl.
CPC ...
381 74 ; 381-2 ; 381370 ;
Abstract
A headphone containing right/left-channel acoustic units capable of converting an analog audio signal into acoustic sounds. An input jack to which is supplied a digital audio signal derived from a digital audio appliance is provided within the headphone. A D/A converter for D/A-converting the digital audio signal supplied to the input jack into an analog audio signal, and an amplifier for amplifying the analog audio signal derived from the D/A converter to supply the amplified analog audio signal to the right/left-channel acoustic units, are provided in this headphone.