公开(公告)号：US5463360A

公开(公告)日：1995-10-31

申请号：US383784

申请日：1995-02-06

申请人： Carlo Buoli ,  Giovanni Mora ,  Tommaso Turillo

发明人： Carlo Buoli ,  Giovanni Mora ,  Tommaso Turillo

IPC分类号： H03B5/18 ,  H03L7/04

CPC分类号： H03L7/04 ,  H03B5/18

摘要： A microwave oscillator has a cavity which is excited with an active element. The phase noise characteristic of the oscillator is improved in that a frequency discriminator utilizes the same oscillator cavity. The waves transmitted and reflected by the cavity are measured, combined and detected by a pair of low noise diodes. The signals obtained are compared to produce a control signal for a phase shifter which is connected between the active element and the cavity. The cavity is preferably a dielectric resonator.

摘要翻译： 微波振荡器具有用有源元件激发的空腔。 改善了振荡器的相位噪声特性，因为鉴频器使用相同的振荡器腔。 通过一对低噪声二极管测量，组合并检测由腔传输和反射的波。 所获得的信号被比较以产生连接在有源元件和空腔之间的移相器的控制信号。 空腔优选为介质谐振器。

公开(公告)号：US5200978A

公开(公告)日：1993-04-06

申请号：US681965

申请日：1991-04-08

申请人： Michelangelo Lo Curto ,  Marcello Salerno

发明人： Michelangelo Lo Curto ,  Marcello Salerno

IPC分类号： H04L27/36

CPC分类号： H04L27/365

摘要： A process for actuation of multi-level digital modulation, and in particular QAM modulation, by using a single microprocessor is described. The process calls for synchronism of all the frequencies in play. The symbols of the "in phase" and "in quadrature" channels and are oversampled and appropriately digitally filtered. A digital carrier is QAM modulated simply by selecting in string the symbols belonging to the digitally filtered channels taken with their true or negated value. These symbols are then sent to a digital/analog converter followed by a reconstruction filter to obtain the corresponding QAM modulated analog carrier.

公开(公告)号：US5191596A

公开(公告)日：1993-03-02

申请号：US488183

申请日：1990-03-05

申请人： Roberto Colombo ,  Giambattista Di Donna

发明人： Roberto Colombo ,  Giambattista Di Donna

IPC分类号： H04L7/02

CPC分类号： H04L7/0062 ,  H04L7/0335

摘要： A timing recovery circuit of the sampling type uses two signal samples per symbol time and utilizes a control signal (for a local oscillator which generates the timing signal) which is given essentially by the product of a reconstruction error signal, derived at the generic sampling instant, multiplied by the difference between the values of the reconstruction symbols, taken at one-half symbol interval respectively before and after said sampling instant. The derived control signal allows generation of a timing signal which positions with extreme accuracy and stability the sampling instant of the received signal at the minimum points of the mean square error curve, even under selective fading conditions.

公开(公告)号：US5012210A

公开(公告)日：1991-04-30

申请号：US446022

申请日：1989-12-05

申请人： Franco Marconi ,  Nicolo De Stena

发明人： Franco Marconi ,  Nicolo De Stena

IPC分类号： H01P1/205

CPC分类号： H01P1/205

摘要： A comb-line band-pass filter with circular cross section is made up of internal rods constituting the resonators of the filter and brought to resonance by the use of tuning screws and alternating with coupling screws. In the filter the rods are inserted in such a manner that each one is rotated in relation to the preceding one by an angle of 0.degree.

公开(公告)号：US5418849A

公开(公告)日：1995-05-23

申请号：US870179

申请日：1992-04-16

申请人： Giacomo Cannalire ,  Giacomo Premoli ,  Roberto Ravasio

发明人： Giacomo Cannalire ,  Giacomo Premoli ,  Roberto Ravasio

IPC分类号： H04B3/23

CPC分类号： H04B3/23

摘要： A procedure and device are described for cancellation of the echo produced in telephone connections with electrical time-variant characteristics such as for example those affected by phase roll. The echo canceller obtained in accordance with the procedure which is the object of this invention produces an estimate of the echo signal by means of appropriate digital filtering of the signal originated by the far-end talker. The estimated echo is then subtracted from the actual echo. Filtering is activated by an IIR digital filter whose adaptive coefficients are updated by use of an adaptive algorithm based on decimation of the square error. The high convergence speed of said algorithm in the calculation of the coefficient correction step allows a correct estimate of the echo even in case of connections affected by phase roll.

摘要翻译： 描述了用于消除在具有电时变特征的电话连接中产生的回波的过程和装置，例如受相位辊影响的那些。 根据作为本发明的目的的程序获得的回波消除器通过对由远端讲话者发起的信号的适当的数字滤波产生回波信号的估计。 然后从实际回波中减去估计的回波。 过滤由IIR数字滤波器激活，其自适应系数通过使用基于平方误差抽取的自适应算法来更新。 所述算法在系数校正步骤的计算中的高收敛速度允许即使在由相位滚动影响的连接的情况下也能正确估计回波。

公开(公告)号：US4875025A

公开(公告)日：1989-10-17

申请号：US44011

申请日：1987-04-29

申请人： Carlo Buoli

发明人： Carlo Buoli

IPC分类号： H01P1/209 ,  H01P5/08 ,  H01P5/107 ,  H01P7/10

CPC分类号： H01P7/10 ,  H01P5/08

摘要： The structure includes a conductive path and a ground plane applied to opposite faces of an insulating support. The ground plane has parallel slots placed under the conductive path and transversely thereto.

摘要翻译： 该结构包括导电路径和施加到绝缘支撑件的相对面上的接地平面。 接地平面具有放置在导电路径下方并且横向于其的平行狭槽。