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:
Jul. 02, 2002
Filed:
Jun. 03, 1999
Sony Corporation, Tokyo, JP;
Abstract
If all original subbands are not selected for processing in conventional subband coders or decoders aliasing distortion is generated by the characteristics of their subband band-splitting filters or subband band synthesis filters. To improve sound quality in a subband decoder the decoded frequency components in the overlap region adjacent to a subband selected not to be decoded are band-limited prior to synthesis. Alternatively, in a subband coder the sound quality in a processed subband adjacent to one not to be coded is improved by band-limiting the filtering frequency overlap region between these subbands prior to coding. By thus decoding only the non-overlapping part of the subband adjacent to an omitted subband signal distortion is reduced.