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11. 发明授权

US5455888A Speech bandwidth extension method and apparatus 失效
标题翻译：语音带宽扩展方法和装置
公开(公告)号：US5455888A
公开(公告)日：1995-10-03
申请号：US985418
申请日：1992-12-04
申请人： Vasu Iyengar , Rafi Rabipour , Paul Mermelstein , Brian R. Shelton
发明人： Vasu Iyengar , Rafi Rabipour , Paul Mermelstein , Brian R. Shelton
IPC分类号： G10L19/00 , G10L19/02 , G10L21/02 , G10L5/06
CPC分类号： G10L21/038 , G10L19/0204 , G10L21/0232
摘要： A speech bandwidth extension method and apparatus analyzes narrowband speech sampled at 8 kHz using LPC analysis to determine its spectral shape and inverse filtering to extract its excitation signal. The excitation signal is interpolated to a sampling rate of 16 kHz and analyzed for pitch control and power level. A white noise generated wideband signal is then filtered to provide a synthesized wideband excitation signal. The narrowband shape is determined and compared to templates in respective vector quantizer codebooks, to select respective highband shape and gain. The synthesized wideband excitation signal is then filtered to provide a highband signal which is, in turn, added to the narrowband signal, interpolated to the 16 kHz sample rate, to produce an artificial wideband signal. The apparatus may be implemented on a digital signal processor chip.
摘要翻译：语音带宽扩展方法和装置分析使用LPC分析以8kHz采样的窄带语音，以确定其频谱形状和反向滤波以提取其激励信号。激励信号内插到16 kHz的采样率，并分析了音调控制和功率电平。然后对产生白噪声的宽带信号进行滤波以提供合成的宽带激励信号。确定窄带形状并将其与各矢量量化器码本中的模板进行比较，以选择各自的高频带形状和增益。然后对合成的宽带激励信号进行滤波以提供高频带信号，该高频带信号又被加到窄带信号中，以16kHz采样率内插，以产生人造宽带信号。该装置可以在数字信号处理器芯片上实现。

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