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1. 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。

2. 发明授权

US08565414B2 Distributed VAD control system for telephone 有权
标题翻译：用于电话的分布式VAD控制系统
公开(公告)号：US08565414B2
公开(公告)日：2013-10-22
申请号：US12930171
申请日：2010-12-30
申请人： Justin L. Allen , Franklyn H. Story , Seth Suppappola
发明人： Justin L. Allen , Franklyn H. Story , Seth Suppappola
IPC分类号： H04M1/00
CPC分类号： H04M1/58
摘要： A telephone includes a transmit channel and a receive channel, each including a bank of sub-band filters having a VAD coupled one to each sub-band filter. Each VAD measures the spectral energy in a sub-band, compares the spectral energy to a first threshold, and produces an output signal representative of whether or not the first threshold is exceeded. The voice activity detector also includes a threshold circuit for calculating a dynamically adjustable noise threshold based upon averaged measured spectral energy. A wide band or system VAD monitors echo canceling circuitry to detect voice activity and double talk.
摘要翻译：电话包括发射信道和接收信道，每个信道包括一组子带滤波器，其具有一个耦合到每个子带滤波器的VAD。每个VAD测量子带中的光谱能量，将光谱能量与第一阈值进行比较，并产生表示是否超过第一阈值的输出信号。语音活动检测器还包括阈值电路，用于基于平均测量的光谱能量来计算动态可调噪声阈值。宽带或系统VAD监视回声消除电路以检测语音活动和双重通话。

3. 发明授权

US07295976B2 Voice activity detector for telephone 有权
标题翻译：语音活动检测器用于电话
公开(公告)号：US07295976B2
公开(公告)日：2007-11-13
申请号：US10056826
申请日：2002-01-25
申请人： Steven M. Domer , Justin L. Allen , Franklyn H. Story , Kellie Michele Vanda
发明人： Steven M. Domer , Justin L. Allen , Franklyn H. Story , Kellie Michele Vanda
IPC分类号： G10L15/00
CPC分类号： H04R3/00
摘要： Voice activity is detected by comparing a signal with two thresholds and producing data representing the energy of the signal. The data, in binary form, is compared with thresholds to determine voice activity. In accordance with another aspect of the invention, the thresholds are adjusted based upon statistical information. In accordance with another aspect of the invention, the data can be weighted to provide an indication of the quasi-RMS energy of an input signal.
摘要翻译：通过将信号与两个阈值进行比较并产生表示信号能量的数据来检测语音活动。将二进制形式的数据与阈值进行比较以确定语音活动。根据本发明的另一方面，基于统计信息调整阈值。根据本发明的另一方面，数据可被加权以提供输入信号的准RMS能量的指示。

4. 发明授权

US06847930B2 Analog voice activity detector for telephone 有权
标题翻译：模拟语音活动检测器，用于电话
公开(公告)号：US06847930B2
公开(公告)日：2005-01-25
申请号：US10057104
申请日：2002-01-25
申请人： Justin L. Allen , Steven M. Domer
发明人： Justin L. Allen , Steven M. Domer
IPC分类号： H04M9/08 , G10L11/02
CPC分类号： H04M9/082
摘要： Voice activity is detected by comparing an analog signal with two voltage thresholds and producing data representing the energy of the signal. The data, in binary form, is compared with thresholds to determine voice activity. In accordance with another aspect of the invention, the thresholds are adjusted based upon statistical information. In accordance with another aspect of the invention, the data can be weighted to provide an indication of the quasi-RMS energy of an input signal. The input signal itself is not converted into digital form yet the data derived from the input signal has high resolution.
摘要翻译：通过将模拟信号与两个电压阈值进行比较并产生表示信号能量的数据来检测语音活动。将二进制形式的数据与阈值进行比较以确定语音活动。根据本发明的另一方面，基于统计信息调整阈值。根据本发明的另一方面，数据可被加权以提供输入信号的准RMS能量的指示。输入信号本身不会转换为数字形式，而从输入信号导出的数据具有高分辨率。

5. 发明申请

US20110150210A1 Distributed VAD control system for telephone 有权
标题翻译：用于电话的分布式VAD控制系统
公开(公告)号：US20110150210A1
公开(公告)日：2011-06-23
申请号：US12930171
申请日：2010-12-30
申请人： Justin L. Allen , Franklyn H. Story , Seth Suppapola
发明人： Justin L. Allen , Franklyn H. Story , Seth Suppapola
IPC分类号： H04M9/08
CPC分类号： H04M1/58
摘要： A telephone includes a transmit channel and a receive channel, each including a bank of sub-band filters having a VAD coupled one to each sub-band filter. Each VAD measures the spectral energy in a sub-band, compares the spectral energy to a first threshold, and produces an output signal representative of whether or not the first threshold is exceeded. The voice activity detector also includes a threshold circuit for calculating a dynamically adjustable noise threshold based upon averaged measured spectral energy. A wide band or system VAD monitors echo canceling circuitry to detect voice activity and double talk.
摘要翻译：电话包括发射信道和接收信道，每个信道包括一组子带滤波器，其具有一个耦合到每个子带滤波器的VAD。每个VAD测量子带中的光谱能量，将光谱能量与第一阈值进行比较，并产生表示是否超过第一阈值的输出信号。语音活动检测器还包括阈值电路，用于基于平均测量的光谱能量来计算动态可调噪声阈值。宽带或系统VAD监视回声消除电路以检测语音活动和双重通话。

6. 发明授权

US06404278B2 Separation of plural band pass filters 有权
标题翻译：分离多个带通滤波器
公开(公告)号：US06404278B2
公开(公告)日：2002-06-11
申请号：US09482293
申请日：2000-01-13
申请人： Justin L. Allen , Samuel L. Thomasson
发明人： Justin L. Allen , Samuel L. Thomasson
IPC分类号： H03K500
CPC分类号： H03H11/1295 , H03H11/1217
摘要： The separation of a adjacent band pass filters is improved, without changing the filters, by inverting the output signals from alternate filters and not inverting the remaining output signals. All the output signals are then summed. The result is a deeper notch in the frequency response of adjacent filters.
摘要翻译：改进相邻带通滤波器的分离，而不改变滤波器，通过反转来自交替滤波器的输出信号，而不反转剩余的输出信号。然后将所有输出信号相加。结果是相邻滤波器的频率响应更深刻。

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