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. 19, 1988
Filed:
Oct. 10, 1986
Applicant:
Inventors:
Masashi Takeda, Kanagawa, JP;
Ikuro Hata, Kanagawa, JP;
Masayuki Katakura, Kanagawa, JP;
Norio Shoji, Tokyo, JP;
Assignee:
Sony Corporation, Tokyo, JP;
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
H03M / ; H03M / ;
U.S. Cl.
CPC ...
3403 / ; 3403 / ; 3403 / ;
Abstract
A digital-to-analog convertor divides an input digital signal into a least significant bit group and a most significant bit group. The most significant bit group is converted using pulse amplitude modulation and the least significant bit group is converted using pulse width modulation, in which the pulse widths are varied symmetrically about predetermined time points within a conversion period in order to improve the linearity of the pulse width modulation conversion.