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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

Active Publication Date: 2016-06-01
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, it is rare for these parameters to be significantly different from the values ​​held for a few milliseconds

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  • Adaptive bandwidth extension and apparatus for the same
  • Adaptive bandwidth extension and apparatus for the same
  • Adaptive bandwidth extension and apparatus for the same

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Embodiment Construction

[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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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.

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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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10L19/032
CPCG10L21/038G10L19/0204G10L19/08G10L19/12G10L19/167G10L19/22G10L19/265
Inventor 高扬
Owner HUAWEI TECH CO LTD
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