公开(公告)号：WO2007081916A3

公开(公告)日：2007-12-21

申请号：PCT/US2007000463

申请日：2007-01-05

Applicant: AUDIENCE INC ,  AVENDANO CARLOS ,  SANTOS PETER

Inventor： AVENDANO CARLOS ,  SANTOS PETER

IPC: H04R25/00

CPC classification number: H04R3/002 ,  G10L21/0208 ,  H04R1/406 ,  H04R3/005 ,  H04R2410/01 ,  H04R2430/20 ,  H04R2499/11

Abstract: Systems and methods for utilizing inter-microphone level differences to attenuate noise and enhance speech are provided. In exemplary embodiments, energy estimates of acoustic signals received by a primary microphone and a secondary microphone are determined in order to determine an inter-microphone level difference (ILD). This ILD in combination with a noise estimate based only on a primary microphone acoustic signal allow a filter estimate to be derived. In some embodiments, the derived filter estimate may be smoothed. The filter estimate is then applied to the acoustic signal from the primary microphone to generate a speech estimate.

Abstract translation: 提供了利用麦克风间差异来衰减噪声和增强语音的系统和方法。 在示例性实施例中，确定由主麦克风和次麦克风接收的声信号的能量估计，以便确定麦克风间级差（ILD）。 该ILD与仅基于主麦克风声信号的噪声估计结合使得能够导出滤波器估计。 在一些实施例中，导出的滤波器估计可以被平滑。 然后将滤波器估计值应用于来自主麦克风的声信号以产生语音估计。

公开(公告)号：WO2013188562A2

公开(公告)日：2013-12-19

申请号：PCT/US2013045462

申请日：2013-06-12

Applicant: AUDIENCE INC

Inventor： AVENDANO CARLOS ,  ATHINEOS MARIOS ,  DUNI ETHAN

IPC: G10L19/12

CPC classification number: G10L19/12 ,  G10L21/0388

Abstract: Audio signal bandwidth extension is performed on a narrow bandwidth signal received from a remote source over the audio communication network. The narrow band signal bandwidth is extended such that the bandwidth is greater than that of the audio communication network. The signal is extended by synthesizing an audio signal having spectral values within an extended bandwidth from synthetic components. The synthetic components may be generated using parameters derived from original narrowband audio signal. The audio signal may be synthesized in the form of an excitation signal and vocal tract envelope. The excitation signal and vocal tract may be extended independently. In various embodiments, excitation components may be derived from constrained synthesis using a constraint filter with nulls in regions where the extension is desired.

Abstract translation: 在通过音频通信网络从远程源接收的窄带宽信号上执行音频信号带宽扩展。 窄带信号带宽被扩展，使得带宽大于音频通信网络的带宽。 通过合成具有来自合成分量的扩展带宽内的频谱值的音频信号来扩展信号。 可以使用从原始窄带音频信号导出的参数来生成合成分量。 音频信号可以以激励信号和声道包络的形式合成。 激发信号和声道可以独立地扩展。 在各种实施例中，激励分量可以使用具有空值的约束滤波器从约束合成导出，其中期望扩展的区域。

公开(公告)号：WO2008045476A3

公开(公告)日：2008-07-24

申请号：PCT/US2007021654

申请日：2007-10-09

Applicant: AUDIENCE INC ,  AVENDANO CARLOS

Inventor： AVENDANO CARLOS

IPC: H04R25/00

CPC classification number: H04R5/027 ,  H04R3/005

Abstract: Systems and methods for utilizing inter-microphone level differences (ILD) to attenuate noise and enhance speech are provided. In exemplary embodiments, primary and secondary acoustic signals are received by omni-directional microphones, and converted into primary and secondary electric signals. A differential microphone array module processes the electric signals to determine a cardioid primary signal and a cardioid secondary signal. The cardioid signals are filtered through a frequency analysis module which takes the signals and mimics a cochlea implementation (i.e., cochlear domain). Energy levels of the signals are then computed, and the results are processed by an ILD module using a non-linear combination to obtain the ILD. In exemplary embodiments, the non-linear combination comprises dividing the energy level associated with the primary microphone by the energy level associated with the secondary microphone. The ILD is utilized by a noise reduction system to enhance the speech of the primary acoustic signal.

Abstract translation: 提供了利用麦克风间差分（ILD）来衰减噪声和增强语音的系统和方法。 在示例性实施例中，一次和二次声信号由全向麦克风接收，并被转换成一次和二次电信号。 差分麦克风阵列模块处理电信号以确定心形主信号和心二次信号。 心脏信号通过频率分析模块进行滤波，频率分析模块接收信号并模拟耳蜗实现（即，耳蜗域）。 然后计算信号的能级，并且使用非线性组合由ILD模块处理结果以获得ILD。 在示例性实施例中，非线性组合包括将与主麦克风相关联的能级除以与辅助麦克风相关联的能级。 噪声降低系统利用ILD来增强主声信号的语音。