公开(公告)号：US20060007998A1

公开(公告)日：2006-01-12

申请号：US10889530

申请日：2004-07-12

申请人： Fa-Long Luo ,  David Chou

发明人： Fa-Long Luo ,  David Chou

IPC分类号： H03H7/30 ,  H04K1/10

CPC分类号： H04L25/03012 ,  H04L25/03159 ,  H04L2025/03414 ,  H04L2025/03445 ,  H04L2025/03522

摘要： The invention provides a DMT or OFDM equalization system that deals with each tone not only separately, but also globally, which provides better overall performance. In the inventive system, only M+T variables are required to be determined, where M is the number of tones and T represents the number of SIRF taps. The invention defines a matrix R, in which optimal coefficients are found as the eigenvector corresponding to the smallest eigenvalue of the matrix R. The dynamic range of all variables is limited in a system in accordance with the present invention, which provides ease of hardware implementation. Furthermore, the inventive system retains the advantages of per-tone equalization by providing a smoother signal-to-noise ratio (SNR) distribution function versus synchronization delay. In addition, no effort is wasted on the equalization of unused tones, because it is unnecessary to determine the coefficients for unused tones.

摘要翻译： 本发明提供了一种DMT或OFDM均衡系统，其不仅分别地，而且全局地处理每个音调，这提供了更好的整体性能。 在本发明的系统中，仅需要确定M + T个变量，其中M是音调的数量，T表示SIRF抽头的数量。 本发明定义了矩阵R，其中找到最佳系数作为与矩阵R的最小特征值对应的特征向量。所有变量的动态范围在根据本发明的系统中受到限制，这提供了硬件实现的容易性 。 此外，本发明的系统通过相对于同步延迟提供更平滑的信噪比（SNR）分布函数来保留每个音调均衡的优点。 此外，由于不需要确定未使用音调的系数，因此不会浪费对未使用音调的均衡。

公开(公告)号：US06702971B2

公开(公告)日：2004-03-09

申请号：US09985385

申请日：2001-11-02

申请人： James Huang ,  William Chou ,  David Chou ,  Shia-Chung Chen ,  Woh-Jer Lee ,  Lei-Ti Huang ,  Ching-Yao Huang

发明人： James Huang ,  William Chou ,  David Chou ,  Shia-Chung Chen ,  Woh-Jer Lee ,  Lei-Ti Huang ,  Ching-Yao Huang

IPC分类号： B29C4712

CPC分类号： B29C55/005 ,  B29C47/0004 ,  B29C47/0021 ,  B29C47/124 ,  B29C55/18 ,  B29K2027/18 ,  B29K2105/0058 ,  B29K2105/256 ,  B29L2007/005 ,  B29L2031/265

摘要： To provide a method of producing a uniaxially stretched polytetrafluoroethylene gasket tape, which comprises: (1) a step for preparing a paste comprising a mixture of a polytetrafluoroethylene powder obtained by emulsion polymerization and an extrusion aid, (2) a step for extruding the paste by means of an extruder equipped with a die which has plural separators inside an orifice thereof having a rectangular cross section, (3) a step for rolling, in the extruding direction, an extrudate having slit lines to give a rolled polytetrafluoroethylene sheet, (4) a step for uniaxially stretching the rolled sheet in the rolling direction after removing the extrusion aid from the rolled sheet, and (5) a step for heat-treating the obtained uniaxially stretched polytetrafluoroethylene sheet. The die of the extruder has plural sheet-like separators in the orifice thereof having a rectangular cross section. The separators are mounted so that free ends thereof are located at a point exceeding a center point of a long side of the orifice, and function to provide slit lines inside the extrudate in parallel with the long side of the orifice. The high performance inexpensive PTFE gasket tape is produced by the uniaxially stretching method and has properties equal to those of biaxially stretched PTFE gasket tape.

摘要翻译： 提供一种单轴拉伸聚四氟乙烯垫片带的制造方法，其特征在于，包括：（1）制备包含通过乳液聚合获得的聚四氟乙烯粉末与挤出助剂的混合物的糊料的步骤，（2）挤出糊料的步骤 （3）在挤出方向上轧制具有切割线的挤出物以得到轧制的聚四氟乙烯片材的步骤（4），（4）在具有矩形横截面的孔中具有多个分离器的模具， ）从轧制板除去挤出助剂后，在轧制方向上单轴拉伸轧制板的工序，（5）对所得单轴拉伸聚四氟乙烯片进行热处理的工序。 挤出机的模具在其孔中具有多个片状隔离物，其截面为矩形。 分离器被安装成使得其自由端位于超过孔的长边的中心点的点上，并且用于在挤出物内部与孔的长边平行地提供切割线。 高性能廉价的PTFE垫片带通过单向拉伸法制造，具有与双轴拉伸PTFE垫片带的性能相同的性能。

公开(公告)号：US6080472A

公开(公告)日：2000-06-27

申请号：US103722

申请日：1998-06-24

申请人： James Huang ,  William Chou ,  David Chou ,  Jenn-Yuh Kau ,  Yui-Whei Cheng-Yang ,  Woh-Jer Lee

发明人： James Huang ,  William Chou ,  David Chou ,  Jenn-Yuh Kau ,  Yui-Whei Cheng-Yang ,  Woh-Jer Lee

IPC分类号： B29C55/00 ,  C08J5/18 ,  B32B3/00

CPC分类号： C08J5/18 ,  B29C55/005 ,  B29K2027/18 ,  B29K2105/04 ,  C08J2327/00 ,  Y10S428/903 ,  Y10S428/91 ,  Y10T428/249978 ,  Y10T428/24999 ,  Y10T428/249992

摘要： To provide a porous polytetrafluoroethylene sheet which has excellent cold flow resistance and is used suitably for gaskets and a highly densified polytetrafluoroethylene sheet which has high tensile strength and flex life and is used suitably for diaphragms. The porous polytetrafluoroethylene sheet is produced from a polytetrafluoroethylene material having a microstructure of nodes interconnected by fibrils and has MTS of from 3,000 to 12,000 psi and C.I. of 0.02 to 0.20 g/cc/psi. The highly densified polytetrafluoroethylene sheet is produced by compression-molding the porous polytetrafluoroethylene sheet and then sintering completely. The porous polytetrafluoroethylene sheet is also laminated with a sheet of other material to provide a composite polytetrafluoroethylene molded article.

摘要翻译： 为了提供耐冷流动性优异的多孔聚四氟乙烯片材，适用于垫片和高度致密化的聚四氟乙烯片材，其具有高拉伸强度和挠曲寿命，并适用于隔膜。 多孔聚四氟乙烯片材由具有通过原纤维互连的节点的微结构的聚四氟乙烯材料制成，并且具有3,000至12,000psi的MTS和C.I. 为0.02〜0.20g / cc / psi。 高密度聚四氟乙烯片材是通过压缩多孔聚四氟乙烯片材然后完全烧结制成的。 多孔聚四氟乙烯片也与其他材料片层压，以提供复合聚四氟乙烯模塑制品。