Apparatus and method for bandwidth extension for multi-channel audio

摘要

A method and apparatus of effectively encoding and decoding a high-frequency signal of a multi-channel audio are provided. A multi-channel audio decoding apparatus may down-mix a multi-channel audio input signal, expand a number of channels of the down-mixed signal, select at least one of the expanded channel signal, extract a parameter indicating a characteristic relation between the selected signal and the multi-channel audio input signal, and encode the down-mixed signal and the extracted parameter.

主权项

1. A multi-channel audio signal encoding apparatus, the apparatus comprising:
a downmixer configured to downmix multi-channel audio input signals; a channel decorrelator configured to expand the number of channels of the downmixed signals, thereby providing expanded channel signals; a parameter estimator configured to select a signal from among the downmixed signals and expanded channel signals and to extract a parameter indicating a characteristic relation between the selected signal and the multi-channel audio input signals; and a bitmuxer configured to encode the downmixed signals and the extracted parameter.