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1. 发明授权

US06928160B2 Estimating bulk delay in a telephone system 有权
标题翻译：估计电话系统中的批量延迟
公开(公告)号：US06928160B2
公开(公告)日：2005-08-09
申请号：US10215959
申请日：2002-08-09
申请人： Samuel Ponvarma Ebenezer , Franklyn H. Story
发明人： Samuel Ponvarma Ebenezer , Franklyn H. Story
IPC分类号： H04M9/08 , H04B3/23
CPC分类号： H04M9/08
摘要： A bulk delay estimating circuit matches time intervals representing a signal with time intervals representing an echo of the signal to identify the echo and estimate bulk delay. Bulk delay is estimated by computing (1, 2, . . . n) intervals representing the signal, computing (1, 2, . . . n) intervals representing an echo of the signal, computing absolute differences between corresponding intervals to produce n absolute differences, summing the n absolute differences, and providing an output indicating whether or not the sum is less than a predetermined amount. The intervals are determined by defining a plurality of numbered frames, comparing the energy of a signal during each frame with at least one threshold, storing the numbers of the frames in which the threshold is exceeded, and defining an interval as the period from one frame in which the threshold is exceeded to the next frame in which the threshold is exceeded. Bulk delay is estimated from the frame numbers of the signal, its echo, and the duration of a frame.
摘要翻译：批量延迟估计电路匹配表示具有表示信号的回波的时间间隔的信号的时间间隔，以识别回波并估计体积延迟。通过计算代表信号的计算（1,2，...）间隔来计算批量延迟，表示信号的回波的计算（1,2，...）间隔，计算相应间隔之间的绝对差以产生n个绝对值差异，对n个绝对差进行求和，并提供表示总和是否小于预定量的输出。通过定义多个编号的帧来确定间隔，将每个帧期间的信号的能量与至少一个阈值进行比较，存储超过阈值的帧的数量，并且将间隔定义为来自一个帧的周期其中阈值超过其中超过阈值的下一帧。根据信号的帧号，其回波和帧的持续时间估计批量延迟。

2. 发明授权

US07649988B2 Comfort noise generator using modified Doblinger noise estimate 有权
标题翻译：舒适噪声发生器使用改进的Doblinger噪声估计
公开(公告)号：US07649988B2
公开(公告)日：2010-01-19
申请号：US10868989
申请日：2004-06-15
申请人： Seth Suppappola , Samuel Ponvarma Ebenezer , Justin L. Allen
发明人： Seth Suppappola , Samuel Ponvarma Ebenezer , Justin L. Allen
IPC分类号： H04M9/08
CPC分类号： G10L19/012
摘要： A background noise estimate based upon a modified Doblinger noise estimate is used for modulating the output of a pseudo-random phase spectrum generator to produce the comfort noise. The circuit for estimating noise includes a smoothing filter having a slower time constant for updating the noise estimate during noise than during speech. Comfort noise is smoothly inserted by basing the amount of comfort noise on the amount of noise suppression. A discrete inverse Fourier transform converts the comfort noise back to the time domain and overlapping windows eliminate artifacts that may have been produced during processing.
摘要翻译：基于修正的多布林格噪声估计的背景噪声估计被用于调制伪随机相位频谱发生器的输出以产生舒适噪声。用于估计噪声的电路包括具有较慢时间常数的平滑滤波器，用于在噪声期间比在语音期间更新噪声估计。通过基于噪声抑制量的舒适噪声量平滑地插入舒适噪声。离散傅里叶逆变换将舒适噪声转换回时域，并且重叠的窗口消除了可能在处理期间产生的伪像。

3. 发明授权

US07492889B2 Noise suppression based on bark band wiener filtering and modified doblinger noise estimate 有权
标题翻译：基于bark波段Wiener滤波和改进的doblinger噪声估计的噪声抑制
公开(公告)号：US07492889B2
公开(公告)日：2009-02-17
申请号：US10830652
申请日：2004-04-23
申请人： Samuel Ponvarma Ebenezer
发明人： Samuel Ponvarma Ebenezer
IPC分类号： H04M1/00 , H04M9/00
CPC分类号： G10L21/0208 , G10L21/0216
摘要： In a noise suppresser, an input signal is converted to frequency domain by discrete Fourier analysis and divided into Bark bands. Noise is estimated for each band. The circuit for estimating noise includes a smoothing filter having a slower time constant for updating the noise estimate during noise than during speech. The noise suppresser further includes a circuit to adjust a noise suppression factor inversely proportional to the signal to noise ratio of each frame of the input signal. A noise estimate is subtracted from the signal in each band. A discrete inverse Fourier transform converts the signals back to the time domain and overlapping and combined windows eliminate artifacts that may have been produced during processing.
摘要翻译：在噪声抑制器中，输入信号通过离散傅里叶分析转换为频域，并分为Bark频带。每个频段估计噪声。用于估计噪声的电路包括具有较慢时间常数的平滑滤波器，用于在噪声期间比在语音期间更新噪声估计。噪声抑制器还包括调节与输入信号的每帧的信噪比成反比的噪声抑制因子的电路。从每个频带的信号中减去噪声估计值。离散傅里叶逆变换将信号转换回时域并重叠，并且组合窗口消除在处理期间可能产生的伪像。

4. 发明授权

US08126706B2 Music detector for echo cancellation and noise reduction 有权
标题翻译：用于回声消除和降噪的音乐探测器
公开(公告)号：US08126706B2
公开(公告)日：2012-02-28
申请号：US11298865
申请日：2005-12-09
申请人： Samuel Ponvarma Ebenezer
发明人： Samuel Ponvarma Ebenezer
IPC分类号： G10L11/06
CPC分类号： G10L25/90 , G10H1/0058 , G10H2210/046 , G10H2210/281 , G10H2240/241 , G10H2240/251 , G10H2250/031 , G10L19/0204 , G10L21/02
摘要： An audio signal is divided among exponentially related subband filters. The spectral flatness measure in each subband signal is determined and the measures are weighted and combined. The sum is compared with a threshold to determine the presence of music or noise. If music is detected, the noise estimation process in the noise reduction circuitry is turned off to avoid distorting the signal. If music is detected, residual echo suppression circuitry is also turned off to avoid inserting comfort noise.
摘要翻译：音频信号被分成指数相关的子带滤波器。确定每个子带信号中的光谱平坦度测量，并对其进行加权和组合。将总和与阈值进行比较以确定音乐或噪声的存在。如果检测到音乐，则噪声降低电路中的噪声估计处理被关闭以避免信号失真。如果检测到音乐，残余回波抑制电路也被关闭，以避免插入舒适噪音。

5. 发明授权

US10015589B1 Controlling speech enhancement algorithms using near-field spatial statistics 有权
公开(公告)号：US10015589B1
公开(公告)日：2018-07-03
申请号：US13199593
申请日：2011-09-02
申请人： Samuel Ponvarma Ebenezer
发明人： Samuel Ponvarma Ebenezer
IPC分类号： H04R3/00 , H04R1/40
CPC分类号： H04R3/005 , H04R1/406 , H04R2201/401 , H04R2201/403 , H04R2410/05 , H04R2430/21 , H04R2430/23 , H04R2430/25 , H04R2499/11
摘要： A telephone includes at least two microphones and a circuit for processing audio signals coupled to the microphones. The circuit processes the signals, in part, by providing at least one statistic representing maximum normalized cross-correlation of the signals from the microphones, doaEst, dirGain, or diffGain and comparing the at least one statistic with a threshold for that statistic. At least one of noise reduction and speech enhancement is controlled by an indication of near-field sounds in accordance with the comparison. Indication of near-field speech can be further enhanced by combining statistics, including a statistic representing inter-microphone level difference, each of which have their own threshold. dirGain and diffGain are derived from signals incident upon the microphones such that the desired near-field signal is not suppressed.

6. 发明授权

US08565446B1 Estimating direction of arrival from plural microphones 有权
标题翻译：估计从多个麦克风到达的方向
公开(公告)号：US08565446B1
公开(公告)日：2013-10-22
申请号：US12657002
申请日：2010-01-12
申请人： Samuel Ponvarma Ebenezer
发明人： Samuel Ponvarma Ebenezer
IPC分类号： H04B15/00 , H04R3/00
CPC分类号： H04R3/002 , H04R3/005 , H04R2410/01 , H04R2410/05 , H04R2430/21 , H04R2430/23
摘要： A noise suppression system includes plural microphones, a fixed beam former, a blocking matrix, plural adaptive filters, and a direction of arrival circuit coupled to the adaptive filters that prevents the filters from adapting in the presence of a signal in the look direction. The direction of arrival circuit causes the filters to adapt more quickly in the absence of a signal in the look direction. A pair of adjustable gain circuits is coupled to each microphone. A first adjustable gain circuit from each pair is calibrated during the presence of a desired signal and a second adjustable gain circuit from each pair is calibrated during the presence of an interfering signal. A fixed null-forming circuit is coupled to a first pair of variable gain circuits and an adaptive null forming circuit is coupled to a second pair of adjustable gain circuits. The ratio of the gains of the null forming circuits is used as a control signal. Successive ratios are averaged with a variable smoothing constant and a control signal is derived from the averaged ratios.
摘要翻译：噪声抑制系统包括多个麦克风，固定波束形成器，阻塞矩阵，多个自适应滤波器以及耦合到自适应滤波器的到达电路的方向，以防止滤波器在外观方向上存在信号的情况下适配。到达电路的方向使得滤波器在外观方向上没有信号的情况下更快地适应。一对可调增益电路耦合到每个麦克风。在存在所需信号期间校准来自每对的第一可调增益电路，并且在存在干扰信号期间校准来自每对的第二可调增益电路。固定的零成型电路耦合到第一对可变增益电路，并且自适应零位形成电路耦合到第二对可调增益电路。无效形成电路的增益比用作控制信号。连续比率用可变平滑常数进行平均，并根据平均比率导出控制信号。

7. 发明授权

US07454010B1 Noise reduction and comfort noise gain control using bark band weiner filter and linear attenuation 有权
标题翻译：降噪和舒适噪声增益控制使用树皮带卫星滤波器和线性衰减
公开(公告)号：US07454010B1
公开(公告)日：2008-11-18
申请号：US10979969
申请日：2004-11-03
申请人： Samuel Ponvarma Ebenezer
发明人： Samuel Ponvarma Ebenezer
IPC分类号： H04M1/00
CPC分类号： G10L21/0208 , G10L19/012
摘要： A combination of noise suppression using a Bark band modified Weiner filter and linear noise reduction improves elimination of noise in a telephone. A detector for detecting long, non-speech intervals is coupled to the output of the noise suppresser and controls selection of noise suppression or noise reduction. A gain smoothing filter has a long time constant when noise reduction is used and provides a gradual transition from one level of gain to another. Comfort noise is smoothly inserted by updating the data for generating comfort noise only during detected long, non-speech intervals.
摘要翻译：使用Bark频带修改的Weiner滤波器和线性噪声降噪的噪声抑制的组合改善了消除电话中的噪声。用于检测长非非语音间隔的检测器耦合到噪声抑制器的输出，并且控制噪声抑制或降噪的选择。当使用降噪时，增益平滑滤波器具有长时间常数，并且提供从一个增益级到另一级的逐渐转变。通过仅在检测到的长非非语音间隔期间更新用于产生舒适噪声的数据来平滑地插入舒适噪声。

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