- 专利标题: Adaptive bandwidth extension and apparatus for the same
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申请号: US15491181申请日: 2017-04-19
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公开(公告)号: US10249313B2公开(公告)日: 2019-04-02
- 发明人: Yang Gao
- 申请人: HUAWEI TECHNOLOGIES CO., LTD.
- 申请人地址: CN Shenzhen
- 专利权人: HUAWEI TECHNOLOGIES CO., LTD.
- 当前专利权人: HUAWEI TECHNOLOGIES CO., LTD.
- 当前专利权人地址: CN Shenzhen
- 代理商 James Anderson Harrison
- 主分类号: G10L19/02
- IPC分类号: G10L19/02 ; G10L19/08 ; G10L19/12 ; G10L19/16 ; G10L19/22 ; G10L19/26 ; G10L21/038
摘要:
A method of decoding an encoded audio bitstream and generating frequency bandwidth extension is disclosed. The method 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 identified within the low frequency band using a parameter which indicates energy information of a low band spectral envelope. A high band excitation spectrum is generated for a high frequency band by copying a sub-band excitation spectrum from the identified 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.
公开/授权文献
- US20170221498A1 Adaptive Bandwidth Extension and Apparatus for the Same 公开/授权日:2017-08-03
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