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. 21, 1980
Filed:
Jul. 27, 1978
Applicant:
Inventor:
Hajime Enomoto, Funabashi, JP;
Assignee:
Kakusai Denshin Denwa Kabushiki Kaisha, Tokyo, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H03K / ;
U.S. Cl.
CPC ...
375 27 ; 375 28 ;
Abstract
A differential pulse code modulation system, in which an input signal is at first approximated to a stepwise waveform having level changes at a constant number n of sampling points selected in the order of level magnitude from a predetermined number N of samples in the input signal. The remainder of the above approximating operation is secondary followed-up by delta modulation, which uses a variable step level controlled in accordance with the variation feature of the remainder. The differential pulse code modulation output is provided by the above two approximating operations.