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. 16, 1990
Filed:
Oct. 23, 1989
Hajime Obinata, Tokyo, JP;
Nakamichi Corporation, Tokyo, JP;
Abstract
A digital/analog converting device comprises a first digital/analog converter for converting upper M bits of an input digital signal into a first analog signal; a memory for receiving, as address data, at least a digital signal of lower N bits of the input digital signal to output lower-bit-output-approximate data of S (S>N) bits in response to the address data; a second digital/analog converter for converting digital data at least including the S-bit lower-bit-output-approximate data into a second analog signal; and an analog adder for outputting an added analog signal obtained by adding the first and second analog signals at a predetermined ratio. The S-bit lower-bit-output-approximate data are set such that, supposing a level change of the added analog signal with respect to a change of an LSB of the upper M bits being .DELTA.L, a minimum step increase of the digital signal of lower N bits causes a level of the added analog signal to increase by about .DELTA.L/2.sup.N.