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:
May. 08, 2001
Filed:
Jan. 19, 1999
Fumiaki Nagao, Ibi-gun, JP;
Sanyo Electric Co., Ltd., Osaka, JP;
Abstract
To encode data Y after separating the data Y into a scale factor SF, a word length, and a data value X. For this purpose, X=Y·{2,−1}/SF is calculated. Here, a value of {2,−1}/SFV with respect to a number of SFV and a number of SL, which are obtained by separating into SF=SF·2,, is stored in a ROM in advance. Then, input data Y is separated into a mantissa part Yr and an index part Ye and Ye is added to SFF. Then, the shifter,shifts Yr according to an additional result to obtain Ye·2,·2,. On the other hand, based on SF and WL, which are determined with respect to Y, a value of corresponding {2,−1}/SFV is read from the ROM. Then, the shifted result is multiplied by the output from the ROM to obtain a data value X. Also, Y=SF·X/{2,−1} is calculated and decoded. Inputted SF is divided into SFV and SFF. Based on the obtained SFV and inputted WL, a value of corresponding SFV/{2,−} is read from the ROM. SFF is given as an index value for the inputted X. The result with the index value given and the output from the ROM are multiplied in a multiplier to calculate Y to decode.