COMPATIBLE MULTI-CHANNEL CODING/DECODING

摘要

In processing a multi-channel audio signal having at least three original channels, a first downmix channel and a second downmix channel are provided, which are derived from the original channels. For a selected original channel, channel side information are calculated such that a downmix channel or a combined downmix channel including the first and the second downmix channels, when weighted using the channel side information, results in an approximation of the selected original channel. The channel side information and the first and second downmix channels form output data to be transmitted to a decoder, which, in case of a low level decoder only decodes the first and second downmix channels or, in case of a high level decoder provides a full multi-channel audio signal based on the downmix channels and the channel side information.

主权项

1. An apparatus for processing a multi-channel audio signal, the multi-channel audio signal having at least three original channels, comprising:
a provider for providing a first downmix channel and a second downmix channel, the first and the second downmix channels being derived from the original channels; a calculator for calculating channel side information for a selected original channel of the original signals, the calculator being operative to calculate the channel side information such that a downmix channel or a combined downmix channel comprising the first and the second downmix channel, when weighted using the channel side information, results in an approximation of the selected original channel; and a generator for generating output data, the output data comprising the channel side information.