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    • 53. 发明授权
    • Chord estimation apparatus and method
    • 和弦估计装置及方法
    • US07411125B2
    • 2008-08-12
    • US11811542
    • 2007-06-11
    • Keiichi YamadaTatsuki Kashitani
    • Keiichi YamadaTatsuki Kashitani
    • G10H1/38G10H7/00
    • G10H1/383G10H2210/076G10H2210/081G10H2250/031
    • A chord estimation apparatus includes: frequency-component extraction means for extracting a frequency component from an input music signal; scale-component information generation means for mapping the frequency component extracted by the frequency-component extraction means onto each tone and generating scale-component information including each tone and loudness thereof; folding means for folding the scale-component information generated by the scale-component information generation means for each two octaves to generate scale-component information including 24 tones; and chord estimation means for inputting the scale-component information including 24 tones into a Bayesian network in order to estimate a chord.
    • 和弦估计装置包括:频率分量提取装置,用于从输入的音乐信号中提取频率分量; 缩放分量信息产生装置,用于将由频率分量提取装置提取的频率分量映射到每个音调上,并产生包括其每个音调和响度的音阶分量信息; 折叠装置,用于折叠由每个两个八度的标度分量信息产生装置产生的比例分量信息,以产生包括24个音调的比例分量信息; 以及和弦估计装置,用于将包括24个音调的比例分量信息输入到贝叶斯网络中以估计和弦。
    • 57. 发明申请
    • AUDIO SIGNAL SEPARATION DEVICE AND METHOD THEREOF
    • 音频信号分离装置及其方法
    • US20060277035A1
    • 2006-12-07
    • US11421619
    • 2006-06-01
    • Atsuo HiroeKeiichi Yamada
    • Atsuo HiroeKeiichi Yamada
    • G10L21/00
    • G10L21/0272
    • Problems of permutation can be solved with high accuracy without utilizing knowledge about original signals or information concerning positions of microphones and the like when each one of plural signals mixed in an audio signal is separated using independent component analysis. A short-time Fourier transformation section generates spectrograms of observation signals from observation signals in time domain. A signal separation section separates the spectrograms of the observation signals into spectrograms of respective signals, to generate spectrograms of separate signals. A permutation problem solution section calculates a scale corresponding to the degree of permutation, e.g., a Kullback-Leiblar information amount calculated by use of a multidimensional probability density function or multidimensional kurtosis, from substantial whole of the spectrograms of the separate signals. Based on the scale, signals at each of frequencies bin of the spectrograms of the separate signals are exchanged between channels, to solve the permutation problem.
    • 当使用独立分量分析将混合在音频信号中的多个信号中的每个信号分离时,不用利用关于原始信号的知识或关于麦克风等的位置的信息,可以高精度地解决置换问题。 短时傅里叶变换部分从时域观测信号产生观测信号的光谱图。 信号分离部将观测信号的光谱图分离成各信号的光谱图,生成分离信号的光谱图。 置换问题解决部分从分离信号的实质上的整个谱图计算对应于置换度的比例,例如,通过使用多维概率密度函数或多维高度计算的Kullback-Leiblar信息量。 基于比例,分离信号的频谱图的每个频率段的信号在信道之间交换,以解决置换问题。
    • 58. 发明授权
    • Image processing method and apparatus
    • 图像处理方法和装置
    • US07065257B2
    • 2006-06-20
    • US10232692
    • 2002-09-03
    • Mineki SogaKeiichi YamadaMitsuhiko Ohta
    • Mineki SogaKeiichi YamadaMitsuhiko Ohta
    • G06K9/40
    • H04N1/2112
    • In an image conversion method and apparatus, luminance Y3 of each pixel of a converted image is obtained by use of an expression Y3=C1Y1+C2Y2 and from luminance Y1 of a corresponding pixel of a source image, luminance Y2 of a corresponding pixel of a low frequency image, and C1 and C2 which are functions of the luminance Y2. Since C1+C2 is constant when Y2≦T2, contrast of a low frequency component can be prevented from decreasing. In a portion in which the luminance Y2 of the low frequency image is low, the low frequency image is enhanced. In a portion in which the luminance Y2 of the low frequency image is high, the low frequency image is suppressed. In a method and apparatus for detecting noise level of an original signal in real time, a plurality of local regions are set on an input image in such a manner that the local regions are distributed uniformly over the entire area of an image. In each local region, determination as to whether or not luminance is saturated is performed. Variation in luminance is detected in each of a plurality of unsaturated local regions. Noise level is determined on the basis of the detected variation.
    • 在图像转换方法和装置中,转换图像的每个像素的亮度Y 3 3通过使用表达式Y 3 3 = C 1&lt; 1&lt; > Y 1 + 2 2 Y 2&gt;和源图像的对应像素的亮度Y 1> 1 低频图像的对应像素的亮度Y 2 2,以及作为亮度Y的函数的C 1和C 2, 2 。 由于当Y 2 <= T 2 2时,C 1 + C 2 <2>是恒定的,所以低频分量 可以防止下降。 在低频图像的亮度Y 2 <2>的部分中,低频图像被增强。 在低频图像的亮度Y 2> 2的部分中,低频图像被抑制。 在用于实时检测原始信号的噪声电平的方法和装置中,多个局部区域被设置在输入图像上,使得局部区域均匀分布在图像的整个区域上。 在每个局部区域中,执行亮度是否饱和的确定。 在多个不饱和局部区域的每一个中检测亮度的变化。 基于检测到的变化来确定噪声水平。