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1. 发明授权

US09245538B1 Bandwidth enhancement of speech signals assisted by noise reduction 有权
标题翻译：通过降噪辅助的语音信号的带宽增强
公开(公告)号：US09245538B1
公开(公告)日：2016-01-26
申请号：US12907788
申请日：2010-10-19
申请人： Carlos Avendano , Carlo Murgia
发明人： Carlos Avendano , Carlo Murgia
IPC分类号： G10L21/00 , H04B15/00 , G10L25/90
CPC分类号： G10L25/90 , G10L21/0208 , G10L21/0388
摘要： The present technology provides robust, high quality expansion of the speech within a narrow bandwidth acoustic signal which can overcome or substantially alleviate problems associated with expanding the bandwidth of the noise within the acoustic signal. The present technology carries out a multi-faceted analysis to accurately identify noise within the narrow bandwidth acoustic signal. Noise classification information regarding the noise within the narrow bandwidth acoustic signal is used to determine whether to expand the bandwidth of the narrow bandwidth acoustic signal. By expanding the bandwidth based on the noise classification information, the present technology can expand the speech bandwidth of the narrow bandwidth acoustic signal and prevent or limit the bandwidth expansion of the noise.
摘要翻译：本技术提供了在狭窄带宽声信号内强大的，高质量的语音扩展，其能克服或基本上减轻与声信号内的噪声扩展带宽相关的问题。本技术进行了多方面的分析，以准确地识别窄带声信号内的噪声。关于窄带声信号内的噪声的噪声分类信息用于确定是否扩展窄带宽声信号的带宽。通过扩展基于噪声分类信息的带宽，本技术可以扩大窄带声信号的语音带宽，防止或限制噪声的带宽扩展。

2. 发明申请

US20130251170A1 Jointly Optimizing Noise Reduction and Voice Quality in a Mono or Multi-Microphone System 有权
标题翻译：在单声道或多麦克风系统中共同优化降噪和语音质量
公开(公告)号：US20130251170A1
公开(公告)日：2013-09-26
申请号：US13888796
申请日：2013-05-07
申请人： Mark Every , Carlos Avendano
发明人： Mark Every , Carlos Avendano
IPC分类号： H04R3/00
CPC分类号： G10L21/0232 , G10L21/0208 , G10L25/18 , G10L2021/02087 , H04R3/002
摘要： The present technology provides adaptive noise reduction of an acoustic signal using a sophisticated level of control to balance the tradeoff between speech loss distortion and noise reduction. The energy level of a noise component in a sub-band signal of the acoustic signal is reduced based on an estimated signal-to-noise ratio of the sub-band signal, and further on an estimated threshold level of speech distortion in the sub-band signal. In various embodiments, the energy level of the noise component in the sub-band signal may be reduced to no less than a residual noise target level. Such a target level may be defined as a level at which the noise component ceases to be perceptible.
摘要翻译：本技术使用复杂的控制水平来提供声信号的自适应降噪，以平衡语音丢失失真和噪声降低之间的权衡。基于子带信号的估计信噪比减小声信号的子带信号中的噪声分量的能级，并且还基于子带信号的估计的语音失真阈值水平，频带信号。在各种实施例中，子带信号中的噪声分量的能量水平可以减小到不小于残余噪声目标水平。这样的目标水平可以被定义为噪声分量不再可察觉的水平。

3. 发明申请

US20130231925A1 Monaural Noise Suppression Based on Computational Auditory Scene Analysis 有权
标题翻译：基于计算听觉场景分析的单声道噪声抑制
公开(公告)号：US20130231925A1
公开(公告)日：2013-09-05
申请号：US13859186
申请日：2013-04-09
申请人： Carlos Avendano , Jean Laroche , Michael M. Goodwin , Ludger Solbach
发明人： Carlos Avendano , Jean Laroche , Michael M. Goodwin , Ludger Solbach
IPC分类号： G10L21/0208
CPC分类号： G10L21/0208 , G10L21/0272
摘要： The present technology provides a robust noise suppression system that may concurrently reduce noise and echo components in an acoustic signal while limiting the level of speech distortion. A time-domain acoustic signal may be received and be transformed to frequency-domain sub-band signals. Features, such as pitch, may be identified and tracked within the sub-band signals. Initial speech and noise models may be then be estimated at least in part from a probability analysis based on the tracked pitch sources. Speech and noise models may be resolved from the initial speech and noise models and noise reduction may be performed on the sub-band signals. An acoustic signal may be reconstructed from the noise-reduced sub-band signals.
摘要翻译：本技术提供了一种强大的噪声抑制系统，其可以同时降低声信号中的噪声和回波分量，同时限制语音失真的水平。可以接收时域声信号并将其变换到频域子带信号。可以在子带信号内识别和跟踪诸如音调的特征。可以至少部分地基于跟踪的音调源的概率分析来估计初始语音和噪声模型。语音和噪声模型可以从初始语音和噪声模型中解决，并且可以对子带信号执行噪声降低。可以从噪声降低的子带信号重构声信号。

4. 发明授权

US08194882B2 System and method for providing single microphone noise suppression fallback 有权
标题翻译：提供单麦克风噪声抑制后备的系统和方法
公开(公告)号：US08194882B2
公开(公告)日：2012-06-05
申请号：US12072931
申请日：2008-02-29
申请人： Mark Every , Carlos Avendano , Ludger Solbach , Carlo Murgia
发明人： Mark Every , Carlos Avendano , Ludger Solbach , Carlo Murgia
IPC分类号： H04B15/00
CPC分类号： G10L21/0208 , G10L2021/02165
摘要： Systems and methods for providing single microphone noise suppression fallback are provided. In exemplary embodiments, primary and secondary acoustic signals are received. A single microphone noise estimate may be generated based on the primary acoustic signal, while a dual microphone noise estimate may be generated based on the primary and secondary acoustic signals. A combined noise estimate based on the single and dual microphone noise estimates is then determined. Using the combined noise estimate, a gain mask may be generated and applied to the primary acoustic signal to generate a noise suppressed signal. Subsequently, the noise suppressed signal may be output.
摘要翻译：提供了提供单麦克风噪声抑制后备的系统和方法。在示例性实施例中，接收主和次声信号。可以基于主声信号来生成单个麦克风噪声估计，而可以基于主声信号和次声信号来生成双麦克风噪声估计。然后确定基于单个和双重麦克风噪声估计的组合噪声估计。使用组合噪声估计，可以生成增益掩模并将其应用于主声信号以产生噪声抑制信号。随后，可以输出噪声抑制信号。

5. 发明申请

US20080212795A1 Transient detection and modification in audio signals 有权
公开(公告)号：US20080212795A1
公开(公告)日：2008-09-04
申请号：US12012251
申请日：2008-01-31
申请人： Michael Goodwin , Carlos Avendano , Martin Wolters , Ramkumar Sridharan
发明人： Michael Goodwin , Carlos Avendano , Martin Wolters , Ramkumar Sridharan
IPC分类号： H03G5/00
CPC分类号： G10L19/025
摘要： A system and method are disclosed for transient detection and modification in audio signals. Digital signal processing techniques are used to detect transients and modify an audio signal to enhance or suppress such transients, as desired. A transient audio event is detected in a first portion of the audio signal. A graded response to the detected transient audio event is determined. The first portion of the audio signal is modified in accordance with the graded response. The extent of enhancement or suppression (as applicable) may be determined at least in part by a measure of the significance or magnitude of the transient.

6. 发明授权

US07277550B1 Enhancing audio signals by nonlinear spectral operations 有权
标题翻译：通过非线性光谱操作增强音频信号
公开(公告)号：US07277550B1
公开(公告)日：2007-10-02
申请号：US10606373
申请日：2003-06-24
申请人： Carlos Avendano , Michael Goodwin , Ramkumar Sridharan , Martin Wolters
发明人： Carlos Avendano , Michael Goodwin , Ramkumar Sridharan , Martin Wolters
IPC分类号： H03G5/00 , H04B15/00 , G10L19/14 , G10L21/00 , G10L21/02
CPC分类号： H03G5/18 , G10L21/02 , H03G7/007
摘要： A system and method are disclosed for enhancing audio signals by nonlinear spectral operations. Successive portions of the audio signal are processed using a subband filter bank. A nonlinear modification is applied to the output of the subband filter bank for each successive portion of the audio signal to generate a modified subband filter bank output for each successive portion. The modified subband filter bank output for each successive portion is processed using an appropriate synthesis subband filter bank to construct a modified time-domain audio signal. High modulation frequency portions of the audio signal may be emphasized or de-emphasized, as desired. The modification may be applied within one or more frequency bands.
摘要翻译：公开了一种用于通过非线性光谱操作来增强音频信号的系统和方法。使用子带滤波器组来处理音频信号的连续部分。对于音频信号的每个连续部分，对子带滤波器组的输出进行非线性修改，以为每个连续部分生成修改的子带滤波器组输出。使用适当的合成子带滤波器组对每个连续部分的修改的子带滤波器组输出进行处理，以构建经修改的时域音频信号。可以根据需要强调或去强调音频信号的高调制频率部分。该修改可以应用于一个或多个频带内。

7. 发明授权

US09210503B2 Audio zoom 有权
标题翻译：音频变焦
公开(公告)号：US09210503B2
公开(公告)日：2015-12-08
申请号：US12896725
申请日：2010-10-01
申请人： Carlos Avendano , Ludger Solbach
发明人： Carlos Avendano , Ludger Solbach
IPC分类号： H03G3/00 , H04R3/00 , H04M1/03
CPC分类号： H04R3/005 , H04M1/03 , H04R2430/20 , H04R2430/21
摘要： An audio equivalent of a video zoom feature for video recording and communication applications, as well as video post production processes. The audio zoom may operate in conjunction with a video zoom feature or independently. The audio zoom may be achieved by controlling reverberation effects of a signal, controlling a gain of the signal, as well as controlling the width of a directional beam which is used to select the particular audio component to focus on. The audio zoom may operate in response to user input, such as a user selection of a particular direction, or automatically based a current environment or other factors.
摘要翻译：与视频录制和通信应用的视频缩放功能相当的音频，以及视频后期制作过程。音频变焦可以与视频缩放功能一起使用或独立操作。音频变焦可以通过控制信号的混响效应，控制信号的增益以及控制用于选择特定音频分量来聚焦的定向波束的宽度来实现。音频变焦可以响应于诸如用户对特定方向的选择或者基于当前环境或其他因素的用户输入来操作。

8. 发明授权

US08750538B2 Method for enhancing audio signals 有权
标题翻译：增强音频信号的方法
公开(公告)号：US08750538B2
公开(公告)日：2014-06-10
申请号：US11744465
申请日：2007-05-04
申请人： Carlos Avendano , Jean Laroche , Michael M. Goodwin
发明人： Carlos Avendano , Jean Laroche , Michael M. Goodwin
IPC分类号： H03G3/00 , H03G9/00 , H03G5/00 , H04B15/00
CPC分类号： H03G5/165
摘要： A frequency band of an audio input signal is analyzed to determine if a transient is present. When transients are detected, modifications are made to the intensity levels corresponding to the frequency band for a brief time period.
摘要翻译：分析音频输入信号的频带以确定是否存在瞬态。当检测到瞬变时，对短暂的时间段对应于频带的强度水平进行修改。

9. 发明授权

US08473285B2 Method for jointly optimizing noise reduction and voice quality in a mono or multi-microphone system 有权
标题翻译：在单声道或多声道系统中共同优化降噪和语音质量的方法
公开(公告)号：US08473285B2
公开(公告)日：2013-06-25
申请号：US13424189
申请日：2012-03-19
申请人： Mark Every , Carlos Avendano
发明人： Mark Every , Carlos Avendano
IPC分类号： G10L21/02
CPC分类号： G10L21/0232 , G10L21/0208 , G10L25/18 , G10L2021/02087 , H04R3/002
摘要： The present technology provides adaptive noise reduction of an acoustic signal using a sophisticated level of control to balance the tradeoff between speech loss distortion and noise reduction. The energy level of a noise component in a sub-band signal of the acoustic signal is reduced based on an estimated signal-to-noise ratio of the sub-band signal, and further on an estimated threshold level of speech distortion in the sub-band signal. In embodiments, the energy level of the noise component in the sub-band signal may be reduced to no less than a residual noise target level. Such a target level may be defined as a level at which the noise component ceases to be perceptible.
摘要翻译：本技术使用复杂的控制水平来提供声信号的自适应降噪，以平衡语音丢失失真和噪声降低之间的权衡。基于子带信号的估计信噪比减小声信号的子带信号中的噪声分量的能级，并且还基于子带信号的估计的语音失真阈值水平，频带信号。在实施例中，子带信号中的噪声分量的能级可以减小到不小于残余噪声目标电平。这样的目标水平可以被定义为噪声分量不再可察觉的水平。

10. 发明授权

US08447596B2 Monaural noise suppression based on computational auditory scene analysis 有权
标题翻译：基于计算听觉场景分析的单声道噪声抑制
公开(公告)号：US08447596B2
公开(公告)日：2013-05-21
申请号：US12860043
申请日：2010-08-20
申请人： Carlos Avendano , Jean Laroche , Michael M. Goodwin , Ludger Solbach
发明人： Carlos Avendano , Jean Laroche , Michael M. Goodwin , Ludger Solbach
IPC分类号： G10L21/02
CPC分类号： G10L21/0208 , G10L21/0272
摘要： The present technology provides a robust noise suppression system that may concurrently reduce noise and echo components in an acoustic signal while limiting the level of speech distortion. An acoustic signal may be received and transformed to cochlear domain sub-band signals. Features, such as pitch, may be identified and tracked within the sub-band signals. Initial speech and noise models may be then be estimated at least in part from a probability analysis based on the tracked pitch sources. Speech and noise models may be resolved from the initial speech and noise models and noise reduction may be performed on the sub-band signals. An acoustic signal may be reconstructed from the noise-reduced sub-band signals.
摘要翻译：本技术提供了一种强大的噪声抑制系统，其可以同时降低声信号中的噪声和回波分量，同时限制语音失真的水平。可以接收声信号并将其变换为耳蜗域子带信号。可以在子带信号内识别和跟踪诸如音调的特征。可以至少部分地基于跟踪的音调源的概率分析来估计初始语音和噪声模型。语音和噪声模型可以从初始语音和噪声模型中解决，并且可以对子带信号执行噪声降低。可以从噪声降低的子带信号重构声信号。

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