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. 31, 2009
Filed:
May. 28, 2002
Ralf Geiger, Wümbach, DE;
Thomas Sporer, Fürth, DE;
Karlheinz Brandenburg, Erlangen, DE;
Jürgen Herre, Buckenhof, DE;
Jürgen Koller, Wümbach, DE;
Ralf Geiger, Wümbach, DE;
Thomas Sporer, Fürth, DE;
Karlheinz Brandenburg, Erlangen, DE;
Jürgen Herre, Buckenhof, DE;
Jürgen Koller, Wümbach, DE;
Abstract
An integer transform, which provides integer output values, carries out the TDAC function of a MDCT in the time domain before the forward transform. In overlapping windows, this results in a Givens rotation which may be represented by lifting matrices, wherein time-discrete sampled values of an audio signal may at first be summed up on a pair-wise basis to build a vector so as to be sequentially provided with a lifting matrix. After each multiplication of a vector by a lifting matrix, a rounding step is carried out such that, on the output-side, only integers will result. By transforming the windowed integer sampled value with an integer transform, a spectral representation with integer spectral values may be obtained. The inverse mapping with an inverse rotation matrix and corresponding inverse lifting matrices results in an exact reconstruction.