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发明公开
CN101770779A 嘈杂的声学信号中的噪声频谱跟踪 失效 - 权利终止

嘈杂的声学信号中的噪声频谱跟踪
摘要：
本发明涉及一种评估包括噪声信号部分和目标信号部分的输入声音信号中噪声功率频谱密度PSD的方法及使用该方法的系统。本发明方法包括：步骤d)，向控制路径提供数字化电输入信号并执行：d1)，存储多个时帧的输入信号；d2)，逐帧地对存储的时帧进行时间-频率转换；d3)，为频谱中的每个频率样本导出包括能含量|Y|2的周期图；d4)，对频谱的每个频率样本应用增益函数G；d5)，将频谱划分成Nsb2个子波段；d6)，基于子波段中频率样本的非零噪声能量水平提供子波段中噪声PSD水平的第一评估d7)，提供子波段中噪声PSD水平的第二改进评估本发明可提供用于评估由掺杂了声学噪声的目标信号组成的声学信号的噪声PSD的方案。
摘要（英）：

The invention relates to a method of estimating noise power spectral density PSD in an input sound signal comprising a noise signal part and a target signal part. The invention comprises a method comprising the steps of d) providing a digitized electrical input signal to a control path and performing; d1) storing a number of time frames of the input signal; d2) performing a time to frequency transformation of the stored time frames on a frame by frame; d3) deriving a periodogram comprising the energy content |Y|2 for each frequency sample in a spectrum; d4) applying a gain function G to each frequency sample of a spectrum2; d5) dividing the spectra into a number Nsb2 of sub-bands; d6) providing a first estimate |{circumflex over (N)}|2 of the noise PSD level in a sub-band based on the non-zero noise energy levels of the frequency samples in the sub-band; d7) providing a second, improved estimate of the noise PSD level in a sub-band. The invention provides a scheme for estimating the noise PSD of the acoustic signal comprising object signal doped with acoustic noise.

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