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:
Apr. 09, 1991
Filed:
Feb. 20, 1990
Norihisa Shirota, Kanagawa, JP;
Sony Corporation, Tokyo, JP;
Abstract
A highly efficient coding apparatus for encoding digital video data in a block format and compressing the video data if required into a number of bits so that the total number of bits in the digital video data to be transmitted is less than that of a predetermined transmission capacity. Coefficient data having a DC component and a plurality of AC components for each block are generated by an orthogonal transformation. A distribution table of the AC coefficient data is generated during a predetermined period, and an accumulating distribution table is generated from the distribution table. The total bit number of the AC coefficient data generated during the predetermined period is controlled in response to the accumulating distribution table and the predetermined transmission capacity of the data transmission channel. The DC coefficient data, the controlled AC coefficient data and an additional code are transmitting for each of the predetermined periods.