公开(公告)号：US06112169A

公开(公告)日：2000-08-29

申请号：US745955

申请日：1996-11-07

申请人： Mark Dolson

发明人： Mark Dolson

IPC分类号： G10L21/04 ,  G10L19/02

CPC分类号： G10L21/04 ,  G10L25/27

摘要： A system and method for preserving the natural sound of a signal that is processed by an analysis step of converting the signal into a sequence of overlapping windowed DFT representations and a synthesis step of converting these DFT representations back to a time domain signal. For example, the system and method are applicable to analysis-synthesis systems based on a sequence of overlapping windowed, DFT representations in which either: (1) the analysis transforms overlap in time by a different amount than the synthesis transforms, or (2) the modification involves a re-mapping of transform values from one frequency location to another. The phases of the complex-valued DFT representations may be modified so that synthesis of the time domain signal results in a natural sound despite the effects of e.g., either (1) or (2).

摘要翻译： 一种用于保持信号的自然声音的系统和方法，该信号由通过将信号转换成重叠的窗口DFT表示的序列的分析步骤处理，以及将这些DFT表示转换回时域信号的合成步骤。 例如，该系统和方法适用于基于重叠窗口DFT表示序列的分析合成系统，其中：（1）分析在时间上重叠与合成变换不同的量，或者（2） 修改涉及从一个频率位置到另一个频率位置的变换值的重新映射。 可以对复值DFT表示的相位进行修改，使得即使具有例如（1）或（2）的效果，时域信号的合成也会产生自然的声音。