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    • 21. 发明申请
    • METHOD FOR DETECTING AUDIO TICKS IN A NOISY ENVIRONMENT
    • 用于在噪声环境中检测音频音调的方法
    • US20120288103A1
    • 2012-11-15
    • US13512139
    • 2010-11-26
    • Mark van StaalduinenVictor Bastiaan KlosPeter Jan Otto Doets
    • Mark van StaalduinenVictor Bastiaan KlosPeter Jan Otto Doets
    • H04R29/00
    • G06F3/002G06F1/1626G06F3/017G06F2200/1636G10L25/48
    • A method for detecting, in an audio signal including a stream of audio samples (y(n), (y′(n)), ticks in a noisy environment, comprises the steps of applying the signal to a coarse tick detection processor arranged to decide whether it is likely that the signal includes a tick and, only then, enabling a fine tick detection processor to decide, by more thorough processing the audio signal, whether the audio signal represents an audio tick. The coarse processing step preferably includes buffering audio samples (y(n), (y′(n)), determining the maximum and minimum values of each sample, forming their local range, delaying the local range with one or more samples and comparing the difference between the actual local range and the delayed local range with a threshold value (Tc), and, if the difference exceeds the threshold value, outputting a trigger (nc) for enabling the fine detection processor The fine processing step preferably includes buffering audio samples (y(n), (y′(n)), computing, for each buffer content (Bp(n,m)), a Fast Fourier Transformed buffer content (Ec(ω,m)), determining the difference (Fc(ω,m)) between the resulting frequency components, comparing the difference (Fc(ω,m)) to the content of a previously trained fingerprint set (F*(ω,m)) and calculating a correlation coefficient (p(Fc,F*)) between them, comparing the correlation coefficient to a threshold value (Tp) and, if the correlation coefficient exceeds the threshold value, outputting a signal indication the presence of a tick in the audio signal.
    • 一种用于在包括音频样本流(y(n),(y'(n))的音频信号中检测噪声环境中的时钟的方法,包括以下步骤:将信号应用于布置成 决定信号是否可能包含一个刻度,只有这样,才能使精细刻度检测处理器通过更全面地处理音频信号来决定音频信号是否表示音频刻度,粗略处理步骤优选地包括缓冲音频 样本(y(n),(y'(n)),确定每个样本的最大值和最小值,形成其局部范围,用一个或多个样本延迟局部范围,并将实际局部范围与 具有阈值(Tc)的延迟本地范围,并且如果差超过阈值,则输出用于启用精细检测处理器的触发(nc)。精细处理步骤优选地包括缓冲音频样本(y(n),(y '(n)),计算 对于每个缓冲器内容(Bp(n,m)),快速傅里叶变换缓冲器内容(Ec(ω,m)),确定所得到的频率分量之间的差(Fc(ω,m)), (Fc(ω,m))与先前训练的指纹集(F *(ω,m))的内容相关并计算它们之间的相关系数(p(Fc,F *)),将相关系数与阈值 值(Tp),并且如果相关系数超过阈值,则输出在音频信号中存在刻度的信号。