公开(公告)号：USD412420S

公开(公告)日：1999-08-03

申请号：US75464

申请日：1997-08-21

Applicant: Frederick J. Harris

Designer： Frederick J. Harris

公开(公告)号：USD409029S

公开(公告)日：1999-05-04

申请号：US75587

申请日：1997-08-21

Applicant: Frederick J. Harris

Designer： Frederick J. Harris

公开(公告)号：US5757867A

公开(公告)日：1998-05-26

申请号：US413331

申请日：1995-03-30

Applicant: Robert W. Caulfield ,  Frederick J. Harris ,  William H. McKnight

Inventor： Robert W. Caulfield ,  Frederick J. Harris ,  William H. McKnight

IPC: H03H17/06 ,  H03M3/02 ,  H04L27/20 ,  H04L27/22 ,  H03D1/04 ,  H03M3/00

CPC classification number: H03H17/0664 ,  H04L27/206 ,  H04L27/22

Abstract: A digital mixing to baseband decimation filter includes a mixer section and a low-pass filter section. The mixer section generates in-phase and quadrature signal components at baseband from low-resolution, high-rate digital data lying within a signal passband offset from baseband. The low-pass filter section transforms an incoming data stream to high-resolution, low-rate digital data. The mixer section can precede or follow the filter section.

Abstract translation: 数字混合到基带抽取滤波器包括混频器部分和低通滤波器部分。 混频器部分在基带处产生位于与基带的信号通带偏移内的低分辨率，高速率数字数据的同相和正交信号分量。 低通滤波器部分将输入数据流转换为高分辨率，低速率数字数据。 混频器部分可以在滤波器部分之前或之后。

公开(公告)号：US5736950A

公开(公告)日：1998-04-07

申请号：US384819

申请日：1995-01-31

Applicant: Frederick J. Harris ,  Robert W. Caulfield ,  William H. McKnight

Inventor： Frederick J. Harris ,  Robert W. Caulfield ,  William H. McKnight

IPC: H03M3/02

CPC classification number: H03M3/396 ,  H03M7/3017 ,  H03M3/402 ,  H03M3/418 ,  H03M3/43 ,  H03M3/448 ,  H03M3/452 ,  H03M3/458 ,  H03M3/50 ,  H03M7/3028 ,  H03M7/3035 ,  H03M7/3037

Abstract: A band-pass sigma-delta modulator includes a translator for tuning to a selected signal passband within the tuning range of the modulator. In a network implementation, the translator is integral with each integrator associated with the sigma-delta modulator(s). The translator can comprise a network having a transfer function defined in the Z-domain as (Z.alpha.-1)/(Z-.alpha.), where -1.ltoreq..alpha..ltoreq.1 defines the tuning. The value of .alpha. is defined as .alpha..tbd.cos(2.pi.f.sub.gm /f.sub.s), where f.sub.gm is the geometric mean frequency of the passband and f.sub.s is the input sample frequency of the sigma-delta modulator(s). The invention can benefit many signal processing applications such as, for example, A/D, D/A and D/D converters; and digital communication systems including digital radio and digital TV. In digital communications (e.g., radio, TV, etc.), the invention can be used where it is desirable to digitize the full tuning range or bandwidth of a receiver at an intermediate frequency early in the processing chain, thus allowing digital tuning or mixing of the desired signal. Such digital mixing or tuning overcomes the limitations of analog mixers/receivers, for example limited linearity in dynamic range as well as the problems associated with aliasing, artifacts, ghosts, harmonics, distortion, gain and phase mismatch, etc. The sigma-delta modulator of the invention also provides variable bandwidth, is operationally stable and is easily and inexpensively realized.

Abstract translation: 带通Σ-Δ调制器包括用于调谐到调制器的调谐范围内的选定信号通带的转换器。 在网络实现中，转换器与与Σ-Δ调制器相关联的每个积分器是一体的。 翻译器可以包括具有在Z域中定义的传递函数的网络（Zα1）/（Z-α），其中-1

公开(公告)号：US5678750A

公开(公告)日：1997-10-21

申请号：US572692

申请日：1995-12-14

Applicant: Frederick J. Harris

Inventor： Frederick J. Harris

IPC: B23K20/12 ,  B23K37/04

CPC classification number: B23K20/129 ,  B23K20/1205 ,  B23K2201/001

Abstract: Friction welding tooling includes a cassette (2,4) for holding a component (6) which is to be welded with great accuracy to a clamped workpiece. The cassette is carried on the distal end of an oscillator arm (8) and urged against the workpiece surface so the cassette has to transmit the frictional heating and weld forming forces to the component. The component (6) must be clamped accurately and securely by the cassette for accurate welding. The cassette comprises a base portion (2) and a floating cap (4). The base portion carried by the oscillator arm (8) has locating features (15,16) to position the component (6) accurately. The floating cap (4) has similar locating features (13,16) but locates entirely on the component (6). The cap (4) is then securely clamped to the base portion (2) with a force transmitting wedge (22) inserted by opposing faces (24,25) in a load path.

Abstract translation: 摩擦焊接工具包括用于保持组件（6）的盒（2,4），该组件（6）将被高精度地焊接到夹紧的工件上。 盒式磁带承载在振动臂（8）的远端并且被推靠在工件表面上，以便盒必须将摩擦加热和焊接成形力传递到部件。 组件（6）必须由盒子精确和牢固地夹紧以进行精确的焊接。 所述盒包括基部（2）和浮动盖（4）。 由振荡臂（8）承载的基座部分具有准确地定位部件（6）的定位特征（15,16）。 浮动盖（4）具有类似的定位特征（13,16），但是完全位于组件（6）上。 然后通过在负载路径中相对的面（24,25）插入的力传递楔（22）将盖（4）牢固地夹紧到基部（2）。