Apparatus and method for bandwidth extension for multi-channel audio
AssigneeSamsung Electronics Co., Ltd.
InventorsMi Young KIM, Ki Hyun CHOO, Eun Mi OH, Boris KUDRYASHOV, Kirill YURKOV
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Abstract
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.
Claims13
A multi-channel audio signal encoding apparatus, the apparatus comprising:
- a downmixer configured to downmix a multi-channel audio input signal;
- a channel decorrelator configured to expand a number of channels of the downmixed signal thereby providing an expanded channel signal;
- a parameter estimator configured to select at least one signal from among the expanded channel signal, and to extract a parameter indicating a characteristic relation between the selected signal and the multi-channel audio input signal;
- and
- a bitmuxer configured to encode the downmixed signal and the extracted parameter.
A multi-channel audio signal decoding apparatus, the apparatus comprising:
- a bitdemuxer configured to restore, from an input bitstream that is obtained by encoding a multi-channel audio signal, a downmixed signal of the multi-channel audio signal;
- a parameter decoder configured to restore, from the input bit stream, a parameter to be used for restoring a channel signal included in the multi-channel audio signal;
- a channel decorrelator configured to expand a number of channels of the restored downmixed signal;
- a high-frequency signal synthesizer configured to select, from the downmixed signal of which the number of channels is expanded, a channel signal to be patched using the restored parameter;
- and
- a spatial synthesizer configured to restore the channel signal included in the multi-channel audio signal using the selected channel signal and the restored parameter information.
A multi-channel audio signal encoding method of a transmitter, the method comprising:
- downmixing a multi-channel audio input signal;
- expanding a number of channels of the downmixed signal;
- selecting at least one signal from among the expanded channel signal;
- extracting a characteristic relation between the selected signal and the multi-channel audio input signal;
- and
- encoding the downmixed signal and the extracted parameter.
A multi-channel audio signal decoding method of a receiver, the method comprising:
- restoring, from an input bitstream that is obtained by encoding a multi-channel audio signal, a downmixed signal of the multi-channel audio signal;
- restoring, from the input bitstream, a parameter to be used for restoring a channel signal included in the multi-channel audio signal;
- expanding a number of channels of the restored downmixed signal;
- selecting, from the downmixed signal of which the number of channels is expanded, a channel signal to be patched using the restored parameter;
- and
- restoring the channel signal included in the multi-channel audio signal using the selected channel signal and the restored parameter information.
Dependencies are inferred from the claim text.