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:
Mar. 07, 1995
Filed:
May. 23, 1994
Mutsumi Ohta, Tokyo, JP;
NEC Corporation, Tokyo, JP;
Abstract
In a subband coding device for coding a digital device input signal which is a one-dimensional or a two-dimensional signal, a single coding circuit is used instead of a conventional combination of coders and a multiplexer. The coding circuit is for coding subband samples of different frequency bands in each sample group across the frequency bands, as by starting from a lowest frequency band and ending at a highest frequency band or reversedly, and preferably with attention directed to correlation which the subband samples have between two adjacent frequency bands. Zero-level components of the subband samples are preferably run-length coded. When the subband samples of each sample group have a tree structure including subtrees, the subband samples are preferably scanned from a subtree to another subtree either starting at or ending at the subband sample of the lowest frequency band.