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:
Jan. 08, 1991
Filed:
Mar. 31, 1989
Applicant:
Inventors:
Kimihiro Sugino, Ohme, JP;
Mitsumasa Satoh, Ohme, JP;
Assignees:
Hitachi, Ltd., Tokyo, JP;
Hitachi VLSI Engineering Corp., Tokyo, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H03M / ;
U.S. Cl.
CPC ...
341166 ; 341155 ; 370 321 ; 379410 ;
Abstract
An A/D converter included in an echo canceller or the like is furnished with a plurality of rate changing filters that receive the output signals of an oversampling A/D conversion circuit in common, the integration phases of the filters are different from each other as they are selectively advanced or retarded for each one of a plurality of predetermined intervals, and further furnished with an output selection circuit by which internal digital signals delivered as outputs from one of the rate changing filters are selectively transmitted according to the desired phase change.