专利快速检索-快速检索全球专利，免费商用专利数据库-IPRDB

131. 发明授权

US06553118B1 Method and apparatus for calculating DC offset in a digital gyrator 失效
标题翻译：用于计算数字旋转器中的直流偏移的方法和装置
公开(公告)号：US06553118B1
公开(公告)日：2003-04-22
申请号：US09378771
申请日：1999-08-20
申请人： Lane A. Smith , Steven Brooke Witmer , Jonathan Herman Fischer , Donald Raymond Laturell
发明人： Lane A. Smith , Steven Brooke Witmer , Jonathan Herman Fischer , Donald Raymond Laturell
IPC分类号： H04M900
CPC分类号： H04M1/738 , H04M19/001
摘要： A method and apparatus for controlling the DC line current on a telephone line and reducing the amount of error introduced to the system. The error is reduced by compensating for a DC error term introduced by an analog to digital converter having a DC offset. The DC offset is controlled digitally, allowing software to be used to limit the DC error in accordance with predefined parameters. Predefined parameters can be set to accommodate varying country specifications instead of using switches to control resistors and capacitors. In addition, changes in a country's requirements can be accomplished through software, instead of changing components or redesigning a circuit board. The use of software results in increased flexibility by allowing an infinite number of settings via software or software updates, allowing changes to be made quickly and easily throughout the world, and allowing error terms to be accommodated digitally.
摘要翻译：一种用于控制电话线上的直流线路电流并减少引入系统的误差量的方法和装置。通过补偿由具有DC偏移的模数转换器引入的DC误差项来减小误差。 DC偏移受数字控制，允许软件根据预定义的参数来限制直流误差。可以设置预定义参数以适应不同的国家规格，而不是使用开关来控制电阻器和电容器。另外，一个国家要求的变化可以通过软件来实现，而不是改变组件或重新设计电路板。使用软件可以通过软件或软件更新实现无限数量的设置，从而提高灵活性，允许在全球范围内快速，轻松地进行更改，并允许数字化地容纳错误条款。

132. 发明授权

US06389110B1 Telecom service identification resonator apparatus and technique 有权
公开(公告)号：US06389110B1
公开(公告)日：2002-05-14
申请号：US09592864
申请日：2000-06-13
申请人： Jonathan H. Fischer , Donald R. Laturell , Lane A. Smith
发明人： Jonathan H. Fischer , Donald R. Laturell , Lane A. Smith
IPC分类号： H04M124
CPC分类号： H04M3/301 , H04M3/2209 , H04M3/308
摘要： Telephone line service type identification is provided to a telephone technician in the field by the placement of one or more tuned circuit(s) across the telephone line. In one embodiment, an inexpensive tuned circuit such as a ceramic resonator forms a telecom service resonator ID device which is placed across a telephone line, either at the central office or at the customer premises. Injection of a test current at a predetermined frequency, and a suitable amplitude of the same indicates to the technician aspects of telecom service to that particular telephone line (e.g., the existence of POTS, ISDN, and/or xDSL) and or use of the telephone line by a home network such as HPNA. In another embodiment, a telecom service transponder ID device is formed to provide line service identification to an interrogating line technician. The telecom service transponder ID device is activated when the test signal including an appropriate frequency is present to cause excitation in the telecom service transponder ID device. The resonator and transponder devices preferably have very high impedances at all frequencies except at the desired resonant frequency, and thus avoids violation of telephone service standards. The resonator or transponder ID devices may be placed anywhere along the telephone line, but preferably at the customer premises, or in installed equipment utilizing the telephone line. More than one resonation frequency may be implemented with parallel tuned circuits to indicate additional features of service on the telephone line (e.g., the number of services, the existence of a data service, etc.). The frequencies of resonance of the tuned circuits are preferably chosen to exist between the spectrum utilized by the various operating services. The transponder implementation may generate a simple low frequency response signal, or a more sophisticated specific data pattern using amplitude and/or frequency modulation.

133. 发明授权

US06232900B1 Second order digital filter requiring only one sigma delta modulator 有权
标题翻译：二阶数字滤波器只需要一个Σ-Δ调制器
公开(公告)号：US06232900B1
公开(公告)日：2001-05-15
申请号：US09299089
申请日：1999-04-26
申请人： Paul D. Hendricks , Lane A. Smith
发明人： Paul D. Hendricks , Lane A. Smith
IPC分类号： H03M300
CPC分类号： H03H17/0411
摘要： A 2nd order digital filter requiring only one sigma delta modulator is created by implementing (1) a 2nd order feedforward term created by the cascade of two 1st order elements; (2) a 2nd order feedback term created by the cascade of two 1st order elements; and (3) another 2nd order feedback term created by the cascade of two more 1st order elements to eliminate the need for another sigma delta modulator to provide a 2nd order filter. Thus, for the mere ‘cost’ of additional feedback loops, which are small in comparison with the size and complexity of another sigma delta modulator, a second sigma delta modulator is not necessary to implement a 2nd order digital filter in accordance with the principles with the present invention.
摘要翻译：仅需要一个Σ-Δ调制器的二阶数字滤波器通过实现（1）由两个1阶元件级联产生的二阶前馈项来产生; （2）由两个一阶元素级联产生的二阶反馈项; 和（3）由两个以上的第一级元件的级联产生的另一个二阶反馈项，以消除另一个Σ-Δ调制器提供二阶滤波器的需要。因此，对于与另一个Σ-Δ调制器的尺寸和复杂度相比较小的附加反馈回路的“成本”，第二个Σ-Δ调制器不需要根据以下原则实现二阶数字滤波器：本发明。

你已经成功收藏专利！

检索式保存成功!

IPRDB

热门服务

关于我们

友情链接

联系方式