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1. (WO2015043161) METHOD AND DEVICE FOR BANDWIDTH EXTENSION

Pub. No.:    WO/2015/043161    International Application No.:    PCT/CN2014/075420
Publication Date: Fri Apr 03 01:59:59 CEST 2015 International Filing Date: Wed Apr 16 01:59:59 CEST 2014
IPC: G10L 21/02
Applicants: HUAWEI TECHNOLOGIES CO., LTD.
华为技术有限公司
Inventors: LIU, Zexin
刘泽新
MIAO, Lei
苗磊
WANG, Bin
王宾
Title: METHOD AND DEVICE FOR BANDWIDTH EXTENSION
Abstract:
A method and device for bandwidth extension, the method for bandwidth extension comprising: obtaining spread-spectrum parameters, said spread-spectrum parameters comprising one or a plurality of the following parameters: linear prediction coefficient (LPC), line spectral frequency (LSF) parameter, pitch period, decoding rate, adaptive codebook contribution, and algebraic codebook contribution (S11); extending, according to said spread-spectrum parameters, the frequency band of a decoded low-frequency signal in order to obtain a high-frequency signal (S12). The method and device utilize spread-spectrum parameters and correction factors calculated by means of the spread-spectrum parameters to extend the frequency band of the decoded low-frequency signal, thus recovering the high-frequency signal. The high-frequency signal recovered by means of the bandwidth extension method and device is close to the original high-frequency signal and is of ideal quality.