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2. 发明申请

US20080052068A1 Scalable and embedded codec for speech and audio signals 有权
标题翻译：用于语音和音频信号的可扩展和嵌入式编解码器
公开(公告)号：US20080052068A1
公开(公告)日：2008-02-28
申请号：US11889332
申请日：2007-08-10
申请人： Joseph Aguilar , David Campana , Juin-Hwey (Raymond) Chen , Robert Dunn , Robert McAulay , Xiaoquin Sun , Wei Wang , Craig Watkins , Robert Zopf
发明人： Joseph Aguilar , David Campana , Juin-Hwey (Raymond) Chen , Robert Dunn , Robert McAulay , Xiaoquin Sun , Wei Wang , Craig Watkins , Robert Zopf
IPC分类号： G10L21/00
CPC分类号： G10L19/002 , G10L19/093 , G10L19/24
摘要： A system and method for processing of audio and speech signals is disclosed, which provide compatibility over a range of communication devices operating at different sampling frequencies and/or bit rates. The analyzer of the system divides the input signal in different portions, at least one of which carries information sufficient to provide intelligible reconstruction of the input signal. The analyzer also encodes separate information about other portions of the signal in an embedded manner, so that a smooth transition can be achieved from low bit-rate to high bit-rate applications. Accordingly, communication devices operating at different sampling rates and/or bit-rates can extract corresponding information from the output bit stream of the analyzer. In the present invention embedded information generally relates to separate parameters of the input signal, or to additional resolution in the transmission of original signal parameters. Non-linear techniques for enhancing the overall performance of the system are also disclosed. Also disclosed is a novel method of improving the quantization of signal parameters. In a specific embodiment the input signal is processed in two or more modes dependent on the state of the signal in a frame. When the signal is determined to be in a transition state, the encoder provides phase information about N sinusoids, which the decoder end uses to improve the quality of the output signal at low bit rates.
摘要翻译：公开了一种用于处理音频和语音信号的系统和方法，其提供了在不同采样频率和/或比特率下操作的通信设备的范围上的兼容性。系统的分析器将输入信号分成不同的部分，其中至少一个传送足以提供输入信号的可理解的重建的信息。分析器还以嵌入的方式编码关于信号的其他部分的单独信息，从而可以从低比特率到高比特率应用实现平滑的转换。因此，以不同的采样率和/或比特率工作的通信设备可以从分析器的输出比特流中提取相应的信息。在本发明中，嵌入信息通常涉及输入信号的单独参数，或者涉及原始信号参数传输中的附加分辨率。还公开了用于增强系统的整体性能的非线性技术。还公开了一种改进信号参数量化的新方法。在具体实施例中，输入信号以两个或更多个模式被处理，这取决于帧中的信号的状态。当信号被确定为处于转换状态时，编码器提供关于N个正弦曲线的相位信息，解码器端用于以低比特率提高输出信号的质量。

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