公开(公告)号：EP2254113A1

公开(公告)日：2010-11-24

申请号：EP10005240.6

申请日：2010-05-19

申请人： Yamaha Corporation ,  Nara Institute of Science and Technology National University Co

发明人： Ishikawa, Yohei ,  Takahashi, Yu ,  Saruwatari, Hiroshi ,  Kondo, Kazunobu

IPC分类号： G10L21/02

CPC分类号： G10L21/0208 ,  G10L2021/02085 ,  G10L2021/02166

摘要： A In a noise suppression apparatus, an extractor extracts a noise component from an audio signal. A stationary noise estimator estimates stationary noise included in the noise component. A first noise suppressor removes a spectrum of the stationary noise from a spectrum of the audio signal to an extent determined by a subtraction factor. A non-stationary noise estimator estimates a spectrum of non-stationary noise by subtracting the spectrum of the stationary noise from the spectrum of the noise component. A factor setter generates a filtering factor for emphasizing a target sound component contained in the audio signal from the spectrum of the non-stationary noise. A second noise suppressor performs a filtering process using the filtering factor on the audio signal after processing of the first noise suppressor. An index calculator calculates a kurtosis change index representing an extent of change of kurtosis in a frequence distribution of magnitude of the audio signal between the kurtosis observed when processing of the first noise suppression part is performed and the kurtosis observed when processing of the second noise suppression part is performed. A factor adjuster variably controls the subtraction factor according to the kurtosis change index.

摘要翻译： A在噪声抑制装置中，提取器从音频信号中提取噪声分量。 静态噪声估计器估计噪声分量中包含的固定噪声。 第一噪声抑制器从音频信号的频谱去除固定噪声的频谱到由减法因子确定的程度。 非平稳噪声估计器通过从噪声分量的频谱中减去固定噪声的频谱来估计非平稳噪声的频谱。 因子设定器产生用于从非平稳噪声的频谱强调包含在音频信号中的目标声音分量的滤波因子。 第二噪声抑制器在处理第一噪声抑制器之后，使用对音频信号的滤波因子进行滤波处理。 索引计算器计算表示在进行第一噪声抑制部的处理时观察到的峰度与在进行第二噪声抑制的处理时观察到的峰度之间的音频信号的频度分布的峰度变化程度的峰度变化指标 部分执行。 因子调整器根据峰度变化指数可变地控制减法因子。

公开(公告)号：EP2144233A2

公开(公告)日：2010-01-13

申请号：EP09164896.4

申请日：2009-07-08

申请人： Yamaha Corporation ,  Nara Institute of Science and Technology National University Co

发明人： Saruwatari, Hiroshi ,  Uemura, Yoshihisa ,  Kondo, Kazunobu

IPC分类号： G10L21/02

CPC分类号： G10L21/0208 ,  G10L21/0232

摘要： A noise suppression estimation device calculates a noise index value which varies according to kurtosis of a frequence distribution of magnitude of a sound signal before or after suppression of the noise component, the noise index value indicating a degree of occurrence of musical noise after suppression of the noise component in a frequency domain. For example, the noise suppression estimation device calculates first kurtosis of a frequence distribution of magnitude of the sound signal before suppression of the noise component, calculates second kurtosis of a frequence distribution of magnitude of the sound signal after suppression of the noise component, and calculates the noise index value from the first kurtosis and the second kurtosis.

摘要翻译： 噪声抑制估计装置计算噪声指数值，该噪声指数值根据抑制噪声成分之前或之后的声音信号的频度分布的峰度而变化，噪声指数值表示抑制噪声成分之后的音乐噪声的发生程度 频域中的噪声分量。 例如，噪声抑制估计装置计算抑制噪声分量之前的声音信号的频度分布的第一次峰度，计算抑制噪声分量后的声音信号的频度分布的次高峰，并计算 第一次峰度的噪声指数值和第二次峰度峰值。

公开(公告)号：EP2458587A1

公开(公告)日：2012-05-30

申请号：EP11009360.6

申请日：2011-11-25

申请人： Yamaha Corporation ,  Nara Institute of Science and Technology National University Corporation

发明人： Inoue, Takayuki ,  Saruwatari, Hiroshi ,  Kondo, Kazunobu

IPC分类号： G10L21/02

CPC分类号： G10L21/0208 ,  G10L2021/02085 ,  G10L2021/02163

摘要： An audio processing apparatus generates a suppression coefficient sequence that is composed of coefficient values corresponding to frequency components of an audio signal, the frequency components being multiplied by the corresponding coefficient values to suppress noise components of the audio signal. In the audio processing apparatus, a characteristic value calculation unit calculates a noise characteristic value depending on a shape of a magnitude distribution of the audio signal. An intensity setting unit variably sets a suppression intensity of the noise components based on the noise characteristic value. A coefficient sequence generation unit generates the suppression coefficient sequence based on the audio signal and the suppression intensity.

摘要翻译： 音频处理装置生成由与音频信号的频率分量对应的系数值组成的抑制系数序列，频率分量乘以相应的系数值，以抑制音频信号的噪声分量。 在音频处理装置中，特征值计算单元根据音频信号的幅度分布的形状来计算噪声特性值。 强度设定单元根据噪声特性值可变地设定噪声成分的抑制强度。 系数序列生成单元基于音频信号和抑制强度生成抑制系数序列。

公开(公告)号：EP2144233A3

公开(公告)日：2013-09-11

申请号：EP09164896.4

申请日：2009-07-08

申请人： Yamaha Corporation ,  Nara Institute of Science and Technology National University Corporation

发明人： Saruwatari, Hiroshi ,  Uemura, Yoshihisa ,  Kondo, Kazunobu

IPC分类号： G10L21/02

CPC分类号： G10L21/0208 ,  G10L21/0232

摘要： A noise suppression estimation device calculates a noise index value which varies according to kurtosis of a frequence distribution of magnitude of a sound signal before or after suppression of the noise component, the noise index value indicating a degree of occurrence of musical noise after suppression of the noise component in a frequency domain. For example, the noise suppression estimation device calculates first kurtosis of a frequence distribution of magnitude of the sound signal before suppression of the noise component, calculates second kurtosis of a frequence distribution of magnitude of the sound signal after suppression of the noise component, and calculates the noise index value from the first kurtosis and the second kurtosis.

公开(公告)号：EP2544180A1

公开(公告)日：2013-01-09

申请号：EP12005029.9

申请日：2012-07-06

申请人： YAMAHA CORPORATION

发明人： Yagi, Kosuke ,  Saruwatari, Hiroshi ,  Takahashi, Yu

IPC分类号： G10L21/02

CPC分类号： G10L21/028

摘要： In a sound processing apparatus, a matrix factorization unit acquires a non-negative first basis matrix including a plurality of basis vectors that represent spectra of sound components of a first sound source, and acquires an observation matrix that represents time series of a spectrum of a sound signal corresponding to a mixed sound of the first sound source and a second sound source different from the first sound source. The matrix factorization unit generates a first coefficient matrix, a second basis matrix and a second coefficient matrix from the observation matrix by non-negative matrix factorization using the first basis matrix. A sound generation unit generates either of a sound signal according to the first basis matrix and the first coefficient matrix or a sound signal according to the second basis matrix and the second coefficient matrix.

摘要翻译： 在声音处理设备中，矩阵分解单元获取包括表示第一声源的声音分量的光谱的多个基向量的非负第一基矩阵，并且获取表示第一声源的频谱的时间序列的观测矩阵 声音信号对应于第一声源和不同于第一声源的第二声源的混合声音。 矩阵分解单元使用第一基础矩阵通过非负矩阵分解从观察矩阵生成第一系数矩阵，第二基础矩阵和第二系数矩阵。 声音产生单元根据第一基础矩阵和第一系数矩阵产生声音信号或根据第二基础矩阵和第二系数矩阵产生声音信号中的任一个。