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. 01, 2002
Filed:
Jan. 28, 1999
Masaru Matsui, Gifu, JP;
Sanyo Electric Co., Ltd., , JP;
Abstract
To simplify the structure of a discrete cosine transformation circuit for use in an audio recording/reproducing device. A selector can desirably supply a value “0” to an input terminal B of the adder/subtracter ( ), so that an input to the adder/subtracter ( ) via an input terminal A can be passed intact therethrough to be fed back thereto via the input terminal B. With this arrangement, direct connection between a multiplier to the input terminal B is unnecessary, and a selector which conventionally selects the direct connection and a loop back is also unnecessary. Further, since a selector ( ) relating to proportional coefficients can desirably supply a value “1” to the multiplier ( ), operand data inputted to the multiplier ( ) can be supplied intact to the subsequent adder/subtracter ( ) through the multiplier ( ). That is, a route to the adder/subtracter ( ) which does not pass through the multiplier ( ) is eliminated, and thus a selector for selecting the routes which pass and does not pass through the multiplier ( ) is also eliminated. Further, adjustment of an addition/subtraction order by a calculation order controlling means enables to reduce the subtraction function of the adder/subtracter ( ), so that the circuit has a simpler structure.