Adaptive bandwidth extension and apparatus for the same
A high-band and sub-band technology, applied in the field of adaptive bandwidth extension method and its device
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[0034] In modern audio / speech digital signal communication systems, the digital signal is compressed at the encoder and the compressed information or bit stream can be packetized and sent frame by frame over the communication channel to the decoder. A decoder receives and decodes compressed information to obtain an audio / speech digital signal.
[0035] The present invention generally relates to speech / audio signal coding and speech / audio signal bandwidth extension. In particular, the embodiments of the present invention can be used to improve the standard of the ITU-TAMR-WB speech coder in the field of bandwidth extension.
[0036] Some frequencies are more important than others. These important frequencies are encoded with high resolution. The subtle differences between these frequencies are important, so a coding scheme that preserves these differences is required. On the other hand, less important frequencies don't have to be precise. Coarser encoding schemes can be use...
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