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:
Feb. 21, 2006
Filed:
Apr. 12, 2000
Pierre Lauber, Nuremberg, DE;
Martin Dietz, Nuremberg, DE;
Juergen Herre, Buckenhof, DE;
Reinhold Boehm, Nuremberg, DE;
Ralph Sperschneider, Erlangen, DE;
Daniel Homm, Erlangen, DE;
Pierre Lauber, Nuremberg, DE;
Martin Dietz, Nuremberg, DE;
Juergen Herre, Buckenhof, DE;
Reinhold Boehm, Nuremberg, DE;
Ralph Sperschneider, Erlangen, DE;
Daniel Homm, Erlangen, DE;
Abstract
In a method for concealing an error in an encoded audio signal a set of spectral coefficients is subdivided into at least two sub-bands (), whereupon the sub-bands are subjected to a re-verse transform (). A specific prediction is performed () for each quasi time signal of a sub-band to obtain an estimated temporal representation for a sub-band of a set of spectral coefficients following the current set. A forward transform () of the time signal of each sub-band provides estimated spectral coefficients which can be used () instead of erroneous spectral coefficients of a following set of spectral coefficients, e.g. in order to conceal transmission errors. Transforming at the sub-band level provides independence from transform characteristics such as block length, window type and MDCT algorithm while at the same time preserving spectral processing for error concealment. Thus the spectral characteristics of audio signals can also be taken into account during error concealment.