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35 条记录 (耗时 0.025 秒)

    Analog to digital conversion system utilizing dither
    31.
    发明授权
    Analog to digital conversion system utilizing dither 失效
    使用抖动的模数转换系统

    公开(公告)号：US4914439A

    公开(公告)日：1990-04-03

    申请号：US242366

    申请日：1988-09-09

    申请人： Teruyoshi Nakahashi ,  Tetsuji Ono

    发明人： Teruyoshi Nakahashi ,  Tetsuji Ono

    IPC分类号： H03M1/04 ,  H03M1/06 ,  H03M1/08 ,  H03M1/12

    CPC分类号： H03M1/129 ,  H03M1/0641

    摘要： A system suitable for digitizing an analog audio signal, with the addition of analog dither to the audio signal and, after the digitization of the resulting analog audio/dither signal, the subtraction of digital dither from the digital audio/dither signal. For the production of the analog and digital dither signals, a digital dither generator is employed which generates digital dither of, e.g., 16 bits. The analog dither signal is derived from this 16 bits dither by first translating the same into analog dither of equivalent magnitude and then by reducing its magnitude to a value equivalent to e.g., 10 bits. The digital dither signal, on the other hand, is provided by reducing the magnitude of the 16 bits digital dither to that of substantially 10 bits. The analog dither signal is added to the audio signal, and the resulting analog audio/dither signal is translated by an analog to digital converter of, e.g., 16 bits into a digital audio/dither signal. Then the substantially 10 bits digital dither signal is subtracted from the digital audio/dither signal. A limiter may be connected to the output of the subtracter for limiting the output level when the analog to digital converter is overloaded.

    摘要翻译： 适用于对模拟音频信号进行数字化的系统，其中对音频信号添加模拟抖动，并且在所得到的模拟音频/抖动信号的数字化之后，从数字音频/抖动信号中减去数字抖动。 为了产生模拟和数字抖动信号，采用了产生例如16位的数字抖动的数字抖动发生器。 通过首先将该模拟抖动信号转换为等效幅度的模拟抖动，然后通过将其幅度减小到等于例如10位的值，从该16位抖动中导出模拟抖动信号。 另一方面，数字抖动信号通过将16位数字抖动的大小减小到大致10位的数字抖动来提供。 将模拟抖动信号添加到音频信号中，并且所得到的模拟音频/抖动信号由例如16位的模数转换器转换为数字音频/抖动信号。 然后从数字音频/抖动信号中减去大致10位的数字抖动信号。 限制器可以连接到减法器的输出端，用于限制模数转换器过载时的输出电平。

    Process for producing honeycomb catalyst for exhaust gas conversion
    34.
    发明授权
    Process for producing honeycomb catalyst for exhaust gas conversion 失效
    废气转化用蜂窝催化剂的制造方法

    公开(公告)号：US4504598A

    公开(公告)日：1985-03-12

    申请号：US606612

    申请日：1984-05-03

    申请人： Tetsuji Ono ,  Shoichi Ichihara ,  Tomohisa Ohata ,  Sadao Terui

    发明人： Tetsuji Ono ,  Shoichi Ichihara ,  Tomohisa Ohata ,  Sadao Terui

    IPC分类号： B01D53/94 ,  B01J23/89 ,  B01J37/02 ,  B01J21/04 ,  B01J21/06 ,  B01J23/10

    CPC分类号： B01D53/945 ,  B01J23/894 ,  B01J37/0215 ,  B01D2255/908 ,  Y02T10/22

    摘要： A process for producing a high-temperature resistant honeycomb catalyst, which comprises admixing cerium, zirconium, at least one metal selected from the group consisting of iron and nickel, at least one metal selected from the group consisting of platinum, palladium and rhodium, and optionally at least one metal selected from the group consisting of neodymium, lanthanum and praseodymium, each in the form of an aqueous solution or dispersion of a soluble or easily water-dispersible compound of the metal, with active alumina, drying the mixture, calcining it, dispersing the resulting catalyst composition in an aqueous medium, and depositing the dispersion on a monolithic honeycomb carrier. The resulting catalyst is useful for simultaneous conversion of hydrocarbons, carbon monoxide and nitrogen oxides in an exhaust gas.

    摘要翻译： 一种耐高温蜂窝体催化剂的制造方法，其特征在于，将铈，锆，选自铁和镍的至少一种金属，选自铂，钯和铑中的至少一种金属和 任选的至少一种选自钕，镧和镨的金属，各自为金属的可溶性或易水分散性化合物的水溶液或分散体的形式，与活性氧化铝一起，干燥混合物，煅烧 将所得催化剂组合物分散在水性介质中，并将该分散体沉积在整体式蜂窝载体上。 所得催化剂可用于同时转化废气中的碳氢化合物，一氧化碳和氮氧化物。