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:
Jan. 20, 2004
Filed:
Feb. 09, 1999
Lars Gustaf Liljeryd, Solna, SE;
Per Rune Albin Ekstrand, Stockholm, SE;
Lars Fredrik Henn, Bromma, SE;
Hans Magnus Kristofer Kjörling, Uppsala, SE;
Coding Technologies Sweden AB, Stockholm, SE;
Abstract
The present invention proposes a new method and apparatus for the enhancement of source coding systems. The invention employs bandwidth reduction prior to or in the encoder followed by spectral-band replication at the decoder This is accomplished by the use of new transposition methods, in combination with spectral envelope adjustments. Reduced bitrate at a given perceptual quality or an improved perceptual quality at a given bitrate is offered. The invention is preferably integrated in a hardware or software codec, but can also be implemented as a separate processor in combination with a codec. The invention offers substantial improvements practically independent of codec type and technological progress.