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    • 62. 发明授权
    • Method and apparatus for acoustically driven media filtration
    • 用于声驱动介质过滤的方法和装置
    • US06797158B2
    • 2004-09-28
    • US09814975
    • 2001-03-22
    • Donald L. FekeSanjay GuptaZenon Mandralis
    • Donald L. FekeSanjay GuptaZenon Mandralis
    • B01D2428
    • B01D21/283B01D21/0012B01D24/16B01D24/305B01D24/4631B01D24/4853
    • A method and apparatus for acoustically enhanced particle separation uses a chamber through which flows a fluid containing particles to be separated. A porous medium is disposed within the chamber. A transducer mounted on one wall of the chamber is powered to impose on the porous medium an acoustic field that is resonant to the chamber when filled with the fluid. Under the influence of the resonant acoustic field, the porous medium is able to trap particles substantially smaller than the average pore size of the medium. When the acoustic field is deactivated, the flowing fluid flushes the trapped particles from the porous medium and regenerates the medium. A collection circuit for harvesting the particles flushed from the porous medium is disclosed. Aluminum mesh, polyester foam, and unconsolidated glass beads are disclosed as porous media.
    • 用于声学增强的颗粒分离的方法和装置使用一个室,通过该室流动含有颗粒的流体被分离。 多孔介质设置在室内。 安装在室的一个壁上的传感器被供电以在多孔介质上施加当填充有流体时与腔共振的声场。 在共振声场的影响下,多孔介质能够捕获明显小于介质平均孔径的颗粒。 当声场失效时,流动的流体从多孔介质中冲洗捕获的颗粒并再生介质。 公开了一种用于收集从多孔介质冲洗的颗粒的收集电路。 公开了铝网,聚酯泡沫和未固结的玻璃珠作为多孔介质。
    • 65. 发明授权
    • Method of detecting narrow-band signals in an echo canceller
    • 检测回波消除器中窄带信号的方法
    • US5689556A
    • 1997-11-18
    • US528762
    • 1995-09-15
    • Prabhat K. GuptaSanjay Gupta
    • Prabhat K. GuptaSanjay Gupta
    • H04B3/23
    • H04B3/23
    • A method of detecting narrow-band signals in an echo canceller to control the coefficient update process, echo suppression process, and the disablement of the echo canceller is provided. The method includes the steps of searching for the presence of a generic tone, searching for DTMF tones, searching for a 2100 Hz tone and, if a generic tone is found, searching for a dial tone. If a generic tone is detected on the far end signal, a tone flag is set which triggers the disablement of the echo canceller coefficient update process and the enablement of the echo suppressor process. If a 2100 Hz tone is detected, the echo canceller is disabled. If a DTMF signal is detected, DTMF flags are set which are used by the echo suppressor for suppressing the near end echo. Finally, if a dial tone is detected, dial tone flags are set which cause the disablement of the echo suppressor.
    • 提供了一种检测回波消除器中的窄带信号以控制系数更新过程,回波抑制处理和回波消除器的禁用的方法。 该方法包括以下步骤:搜索通用音调的存在,搜索DTMF音调,搜索2100Hz音调,并且如果发现通用音调,则搜索拨号音。 如果在远端信号上检测到通用音调,则设置音调标志,其触发禁用回声消除器系数更新处理和启用回声抑制器处理。 如果检测到2100 Hz音,则禁用回声消除器。 如果检测到DTMF信号,则设置DTMF标志,由回波抑制器用于抑制近端回波。 最后,如果检测到拨号音,则设置拨号音标志,导致禁用回声抑制器。