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    • 76. 发明授权
    • Linear full duplex system and method for acoustic echo cancellation
    • 用于声学回声消除的线性全双工系统和方法
    • US08275139B2
    • 2012-09-25
    • US12055331
    • 2008-03-26
    • Anil KumarPuneet Gupta
    • Anil KumarPuneet Gupta
    • H04B3/20H04M9/08
    • H04B3/234H04M9/082
    • A linear full duplex system and method for acoustic echo cancellation is disclosed. In one embodiment, a method includes calculating a residual echo after subtraction of an echo estimate from a near end signal associated with a communication, refining a far end and a residual signal associated with the communication, updating, based on the far end signal, the echo estimate of an echo associated with the communication, subtracting the echo from the near end signal based on the echo estimate to cancel the echo associated with the communication, updating, based on the refined far end and refined residual signal, the adaptive filter module used for echo estimation, and detecting a steady state and, during the steady state, dynamically detecting internal substates and switching between the internal substates and detecting and managing double talk associated with the communication.
    • 公开了用于声学回声消除的线性全双工系统和方法。 在一个实施例中,一种方法包括:从与通信相关联的近端信号,精简远端和与通信相关联的残留信号中减去回波估计之后计算残差回波,基于远端信号进行更新 与通信相关联的回波的回波估计,基于回波估计减去来自近端信号的回波,以消除与通信相关联的回波,基于精化的远端和精细的残差信号进行更新,所使用的自适应滤波器模块 用于回波估计,并且检测稳态,并且在稳态期间,动态地检测内部子状态和内部子状态之间的切换以及检测和管理与通信相关联的双重通话。
    • 80. 发明申请
    • POLARIZING PHOTOCHROMIC ARTICLES
    • 偏光照相文章
    • US20110279883A1
    • 2011-11-17
    • US13153748
    • 2011-06-06
    • Anil KumarRachael L. YoestChenguang LiDelwin S. JacksonHenry Nguyen
    • Anil KumarRachael L. YoestChenguang LiDelwin S. JacksonHenry Nguyen
    • G02F1/03
    • C09B57/00C09B57/02C09K19/60G02B5/22G02B5/23G02F1/1335
    • Provided are photochromic articles that include a substrate, a primer layer that includes a first photochromic compound, and a photochromic-dichroic layer over the primer layer that includes a photochromic-dichroic compound. The first photochromic compound and the photochromic-dichroic compound each are selected such that the photochromic-dichroic compound has an absorbance of less than or equal to 0.1 at the wavelength of peak absorbance of the underlying first photochromic compound. The present invention also relates to such photochromic articles that further include a topcoat layer over the photochromic-dichroic layer. The topcoat layer can include a second photochromic compound that has an absorbance of less than 0.1 at the wavelength of peak absorbance of the underlying photochromic-dichroic compound. The photochromic articles provide, for example, a combination of linear polarizing properties, and reduced percent transmittance when in a colored or darkened state, such as when exposed to actinic light.
    • 本发明提供的光致变色制品包括底物,包含第一光致变色化合物的底漆层和包含光致变色二色性化合物的底漆层上的光致变色二色性层。 选择第一光致变色化合物和光致变色二色性化合物,使得光致变色二色性化合物在下面的第一光致变色化合物的峰值吸光度的波长处具有小于或等于0.1的吸光度。 本发明还涉及这样的光致变色制品,其进一步包括在光致变色二向色层上的顶涂层。 顶涂层可以包括在底色的光致变色二色性化合物的峰值吸光度的波长处具有小于0.1的吸光度的第二光致变色化合物。 光致变色制品提供例如线性偏振性质的组合,以及当在有色或暗色状态下,例如当暴露于光化光时,其透光率降低。