Method, device, encoder apparatus, decoder apparatus and audio system
AssigneeKoninklijke Philips Electronics N.V.
InventorsMachiel Van Loon, Gerard Hotho, Dirk Breebaart
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Abstract
Method for processing a stereo signal comprising: Encoding á N-channel audio signal in a stereo signal (Lo, Ro) and spatial parameters (wl, wr), processing the stereo signal using the spatial parameters for generating a processed stereo signal (low, Row). The matrix of the processed stereo signal can be discribed as the matrix of the stereo signal, multiplied by a filter matrix (H) which element are filter functions (H1, H2, H3, H4) operated with spatial parameters (wl, wr) and a constant (a). The filter functions are time invariant and selected so that the matrix is invertible.
Claims20
A method of processing a stereo signal obtained from an encoder, which encoder encodes an N-channel audio signal into left and right signals (L0;R0) and spatial parameters (P), the method comprising:
- processing said left and right signals in order to provide processed signals (L0w;R0w), in which said processing is controlled in dependence of said spatial parameters (P).
A device for processing a stereo signal obtained from an encoder, which encoder encodes an N-channel audio signal into left and right signals (L0;R0) and spatial parameters (P), the device comprising:
- a post-processor (5) for post-processing said left and right signals in order to provide processed signals (L0w;R0w), in which said post-processing is controlled in dependence of said spatial parameters (P).
An audio system (1) comprising:
- an encoder apparatus having an encoder (2) for encoding an N-channel audio signal into left and right signals (L0;R0) and spatial parameters (P), and a device (5) for post-processing said left and right signals (L0;R0) in order to provide processed signals (L0w;R0w), said post-processing being controlled in dependence on said spatial parameters (P);
- and
- a decoder apparatus for decoding said processed signals (L0w;R0w), said decoder apparatus having a device for processing a stereo signal comprising left and right signals (L0w;R0w), the device comprising means for inverting the post-processing performed in the encoder apparatus in order to provide stereo signals (L0;R0), and a decoder for decoding the stereo signals (L0;R0) into an N-channel audio signal.
Dependencies are inferred from the claim text.