Method and system for generating an estimated clean speech signal from a
noisy speech signal
    1.
    发明授权
    Method and system for generating an estimated clean speech signal from a noisy speech signal 失效
    用于从噪声语音信号产生估计干净语音信号的方法和系统

    公开(公告)号:US5878389A

    公开(公告)日:1999-03-02

    申请号:US496068

    申请日:1995-06-28

    IPC分类号: G10L21/02 G10L3/02

    摘要: A method and system for generating an estimate of a clean speech signal extracts time trajections of short-term parameters from a noisy speech signal to obtain a plurality of frequency components each having a magnitude spectrum and a phase spectrum. The magnitude spectrum is then compressed, filtered and then decompressed to obtain a modified magnitude spectrum. The speech signal is then reconstructed using the original phase spectrum and the modified magnitude spectrum.

    摘要翻译: 用于产生干净语音信号的估计的方法和系统从噪声语音信号中提取短期参数的时间观测,以获得各自具有幅度谱和相位谱的多个频率分量。 然后将幅度谱压缩,滤波,然后解压缩,以获得修改的幅度谱。 然后使用原始相位谱和修改的幅度谱来重构语音信号。

    Laser modulation of LMI sources
    3.
    发明授权
    Laser modulation of LMI sources 失效
    激光调制LMI源

    公开(公告)号:US5015862A

    公开(公告)日:1991-05-14

    申请号:US467971

    申请日:1990-01-22

    CPC分类号: H01J27/24 H01J27/22 H01J37/08

    摘要: A method for modulating a liquid metal ion source includes generating an ion beam, directing a light beam at the liquid metal ion source and inducing a modulation in the ion beam by modulating the light beam.An apparatus for carrying out the invention includes a light beam source for generating a light beam, a modulator for modulating the light beam and a mechanism for directing the modulated light beam at the light metal ion source.

    摘要翻译: 用于调制液态金属离子源的方法包括产生离子束,将光束引导到液态金属离子源,并通过调制光束在离子束中引起调制。 用于实施本发明的装置包括用于产生光束的光束源,用于调制光束的调制器和用于将调制光束引导到轻金属离子源的机构。

    Method and system for adaptive speech enhancement using frequency
specific signal-to-noise ratio estimates
    4.
    发明授权
    Method and system for adaptive speech enhancement using frequency specific signal-to-noise ratio estimates 失效
    使用频率特定信噪比估计的自适应语音增强的方法和系统

    公开(公告)号:US6098038A

    公开(公告)日:2000-08-01

    申请号:US722547

    申请日:1996-09-27

    IPC分类号: G10L21/02 G10L3/02

    CPC分类号: G10L21/0208

    摘要: A method and system for adaptively filtering a speech signal in order to suppress noise in the signal. The method includes decomposing the signal into multiple frequency subbands, each having a center frequency, estimating a signal-to-noise ratio for each subband, and providing multiple filters, each filter designed for one of a number of selected signal-to-noise ratio independent of the center frequencies of the subbands. The method also includes selecting a filter for filtering each subband, where the filter selected depends on the signal-to-noise ratio estimated for the subband, filtering each subband according to the filter selected, and combining the filtered subbands to provide an estimated filtered speech signal. The system includes appropriate hardware and software for performing the method.

    摘要翻译: 一种用于对语音信号进行自适应滤波以抑制信号中的噪声的方法和系统。 该方法包括将信号分解成多个频率子带,每个子频带具有中心频率,估计每个子带的信噪比,并提供多个滤波器,每个滤波器被设计用于多个选择的信噪比之一 独立于子带的中心频率。 该方法还包括选择用于对每个子带进行滤波的滤波器,其中选择的滤波器取决于针对子带估计的信噪比,根据所选择的滤波器对每个子带进行滤波,并组合滤波后的子带以提供估计滤波后的语音 信号。 该系统包括用于执行该方法的适当的硬件和软件。

    Apparatus for optical remote wind sensing
    5.
    发明授权
    Apparatus for optical remote wind sensing 失效
    光学远程风力传感装置

    公开(公告)号:US5123730A

    公开(公告)日:1992-06-23

    申请号:US230324

    申请日:1988-08-09

    IPC分类号: G01P5/00 G01S17/95

    CPC分类号: G01S17/95 G01P5/00

    摘要: The apparatus of the present invention includes a light source for producing a coherent beam of light. A beam splitter is provided for splitting the beam of light into a first, transmitted beam segment and a second, local oscillator beam. A mechanism is provided for frequency shifting the frequency of one or both beam segments and for directing the first beam segment to a target. A remote target for scattering the first beam is provided. A mechanism is provided for combining the scattered first beam segment returning from the target and the second beam segment into a combined beam, and detecting the combined beam. A detector is operative to generate a signal indicative of the crosswind along the path of the directed first beam segment. A mechanism for determining the wind speed normal to the path from the generated signal is also provided.

    摘要翻译: 本发明的装置包括用于产生相干光束的光源。 提供了一种分束器,用于将光束分成第一透射光束段和第二本地振荡器束。 提供了用于对一个或两个光束段的频率进行频移并且用于将第一光束段引导到目标的机构。 提供了用于散射第一光束的远程目标。 提供了一种用于将从目标返回的散射的第一光束段与第二光束段组合成组合光束并且检测组合光束的机构。 检测器可操作以产生指示沿着定向的第一光束段的路径的侧风的信号。 还提供了一种用于从所产生的信号确定与路径正交的风速的机构。