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:
Apr. 30, 2013
Filed:
Mar. 23, 2007
Lars Villemoes, Stockholm, SE;
Erik Schuijers, Eindhoven, NL;
Lars Villemoes, Stockholm, SE;
Erik Schuijers, Eindhoven, NL;
Koninklijke Philips International N.V., Eindhoven, NL;
Dolby Sweden AB, Stockholm, SE;
Abstract
An audio decoder comprises a receiver () for receiving input data comprising an N-channel signal corresponding to a down-mixed signal of an M-channel audio signal, M>N, having complex valued subband encoding matrices applied in frequency subbands and parametric multi-channel data. A subband filter bank () generates real-valued frequency subbands for the N-channel signal. A matrix processor () determines real-valued subband decoding matrices for compensating the application of the encoding matrices in response to the parametric multi-channel data. A compensation processor () generates down-mix data corresponding to the down-mixed signal by a matrix multiplication of the real-valued subband decoding matrices and data of the N-channel signal in the at least some real-valued frequency subbands. The down-mix data can be used to regenerate the down-mixed signal and the M-channel audio signal. The decoder may compensate for MPEG Matrix Surround Compatibility operations performed at the encoder using real-valued frequency subbands.