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
CN105637583AActive Publication Date: 2016-06-01HUAWEI TECH CO LTD
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Applications(China)
Current Assignee / Owner
HUAWEI TECH CO LTD
Publication Date
2016-06-01

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Abstract

In one embodiment of the present invention, a method of decoding an encoded audio bitstream and generating frequency bandwidth extension includes decoding the audio bitstream to produce a decoded low band audio signal and generate a low band excitation spectrum corresponding to a low frequency band. A sub-band area is selected from within the low frequency band using a parameter which indicates energy information of a spectral envelope of the decoded low band audio signal. A high band excitation spectrum is generated for a high frequency band by copying a sub-band excitation spectrum from the selected sub-band area to a high sub-band area corresponding to the high frequency band. Using the generated high band excitation spectrum, an extended high band audio signal is generated by applying a high band spectral envelope. The extended high band audio signal is added to the decoded low band audio signal to generate an audio output signal having an extended frequency bandwidth.
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Description

[0001] This application claims priority to prior application of U.S. Patent Application No. 14 / 478,839, filed September 5, 2014, entitled "Adaptive Bandwidth Extension and Apparatus for the Same," which was filed in 2013 The continuous application of No. 61 / 875,690 U.S. provisional patent application filed on September 10, 2009, entitled "Adaptive Selection of Shifting Band Based on Spectral Energy Level for Bandwidth Extension", these two prior The content of the application is incorporated into this text by reference as if reproduced in its entirety. technical field

[0002] The present invention generally relates to the field of speech processing, and in particular relates to an adaptive bandwidth extension method and a device thereof. Background technique

[0003] In modern audio / speech digital signal communication systems, the digital signal is compressed at the encoder and the compressed information (bit stream) can be packetized and sent frame by frame over the commun...

Claims

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