Frequency-based coding of audio channels in parametric...

Details Frequency-based coding of audio channels in parametric... Frequency-based coding of audio channels in parametric...

H - Electricity

04

S

H04S 3/00 (2006.01)

Patent

CA 2557993

For a multi-channel audio signal, parametric coding is applied to different subsets of audio input channels for different frequency regions. For example, for a 5.1 surround sound signal having five regular channels and one low- frequency (LFE) channel, binaural cue coding (BCC) can be applied to all six audio channels for sub-bands at or below a specified cut-off frequency, but to only five audio channels (excluding the LFE channel) for sub-bands above the cut-off frequency. Such frequency-based coding of channels can reduce the encoding and decoding processing loads and/or size of the encoded audio bitstream relative to parametric coding techniques that are applied to all input channels over the entire frequency range.

Pour un signal audio multicanal, on applique un codage paramétrique à différents sous-ensembles de canaux d'entrée audio pour différentes zones de fréquence. Par exemple, pour un signal sonore ambiophonique (surround) de 5.1 à cinq canaux normaux et un canal basse fréquence (LFE), on peut appliquer un codage BCC (Binaural Cue Coding) aux six canaux audio pour des sous-bandes ou au-dessous d'une fréquence de coupure, mais à cinq canaux audio seulement (à l'exclusion du canal LFE) pour les sous-bandes au-dessus de la fréquence de coupure. Un tel codage de canaux basé sur la fréquence permet de réduire les charges de traitement pour le codage et le décodage et/ou la taille du train binaire audio codé par rapport aux techniques de codage paramétriques appliquées à la totalité des canaux entrants sur toute a plage de fréquences.

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