查询词典 Broad Band

Having studied the digital down-conversionprocess of IF signal before the base band process which follows A/D conversion in wireless communication,the paper puts forward a new idea of utilizing the FPGA to realize multi-channel digital signal DDC.Through analyzing the features and performances of CIC filters,HB filters and multiphase-filter,we combine them with decimators and decimate the A/D data,thus reducing the digital signal rate and the load of DSP when processing the base band signal.

软件无线电技术是在通用的开放式无线电智能平台上，通过安装不同的软件来完成各种通信功能，其结构的基本特征之一就是使A/D变换尽量靠近射频端，目前的方案是在中频对模拟信号进行数字化，对中频数字信号进行下变频处理，使数字信号量降低到高速DSP能够处理的程度[1]。

A duplexer separates an RF signal received from the built-in dual band antenna from an RF signal to be transmitted to the built-in dual band antenna.

双工器分离从内置双频带天线接收的无线电频率信号和要发送到内置双频带天线的RF信号。

This invention discloses a duplexer and a multiplexer of the communication system and a method to realize them on a PCB circuit, which applies a 3db bridge and a low pass filter to constitute a hopstreet duplexer without waste band channels, in which, the signals are shunted and combined by the design of the circuit structure and power distribution of the 3-db bridge and phase offset function, the band filter of the low pass filter and the reflection function of a stopband to make up of a costless duplexer in theory to merge the two channels of different frequencies and reduce loss to increase volume and working bandwidth, then a multiplexer is formed by cascading multiple duplexers.

本发明涉及通信设备，公开了一种通信系统双工器和多工器以及双工多工方法，使得双工器和多工器能够在PCB电路上实现，并且体积小、损耗小、成本低、容量大。本发明中，采用三分贝电桥、低通滤波器构成无损耗频带信道合路的双工器，其中通过电路结构的设计并利用三分贝电桥的功率分配和相位偏移功能将各路信号进行分路和组合，利用低通滤波器的频带滤波和阻带反射功能联合三分贝电桥构造一个理论无耗的双工器，使两路不同频率的信道合路，降低的损耗、提高容量和工作带宽。通过多个上述双工器的级联构成多工器。

The structures of the isomers were assigned by using 2D NMR techniques such as gCOSY. Comparing to the eluates from the chromatographic column, the first band contains the m2, the second band contains the ml.

利用一维及二维核磁共振(2D NMR)技术，结合三元胺中吡啶环的磁屏蔽效应，对两个异构体在溶液中的结构进行了解析，对应于Dowex 50Wx 2柱色层分离的第一包带的H离子为n2(cmen的2位胺基与Cl处于邻位)：第二色带的阳离子为ml。

If the thickness of the colored glass and the band width of the narrow-band filter now on hand is encreased properly, fine signal-to-noise ratio and resolving capability of fluorescence imaging can be obtained.

根据有色玻璃的吸收特性，实验时适当增加光在玻璃中的行程和带宽，使信号和背景光的透过率之比增大，从而得到较好的荧光像的信噪比和分辨本领，提高了图像目视探测的灵敏度。

Receiving the GPS signal in the presence of other blockers, the MAX2658 provides approximately 6dBm better in-band and out-of-band IIP3 for a mere 3.5mA extra supply current.

MAX2658能够在嘈杂的干扰信号环境下有效接收GPS信号，提供大约6dBm的带内和带外IIP3性能提升，而电源电流仅增加3.5mA。

The band includes KC, Henry, Field, Gabriel and Martin. Field and Martin have been childhood friends since primary school and met the remaining band members in secondary school.

乐队吉他手Field与鼓手Martin是一起走过童年的好友，他们在中学时代遇见了现在的乐队主唱KC，贝斯Henry以及另一位吉他手Gabriel。

Calibration tool storage cabinet rolling rack w/lights statu go rack rolling rack w/hardhats.tool.rarts metal work station office chairs 7"miter band saw fiberglass backing plates 12"band saw filing cabinets 7 air conditioners 6 humidifiers 2 grinders 2-carts w/testing equipment golf cart 6 utility carts left upper wing right upper wing 4 rolls of final bagging disassembled lay up room lexan 4*8*9/8 3 roof top air ducts preforming core fuselage to wing part non conforming steel/alominum insulation tubes left lower wing right lower wing horizontal upper tail 2 sheets of 1honeycomb core office cubicles cabin door frame template 1 medium size cabinet 2 small cabinets flammable container L.H.boom inboard flap hinge(2) R.H.boom inboard flap hinge(1) L.H.outboard nacelle little fuse CSL mold AFT keelgusset mold LH boom inboard mold RH boom outboard mold LH upper fuel tank mold RH lower fuel tank mold universal safety mats(13) aileron bond/drill jigs metal saw hooses 5-lay up tables safety mat trim kit empty rack office chairs left assembled boom right assembled boom utility carts small file cab bagging material black med.

标定工具储藏柜轧制机架瓦特/灯 statu去机架轧制机架瓦特/ hardhats.tool.rarts 金属工作站办公椅 7 &字带锯玻纤板支持 12 &带锯档案柜 7空调 6加湿器 2磨床 2 ，车瓦/测试设备高尔夫球车 6实用车左上翼右上翼 4卷最后套袋拆卸积储室聚碳酸酯4 * 8 * 9月8日 3天台冷气槽预成形核心机身的一部分，以翼不符合钢铁/ alominum 保温管左下翼右下翼横向上尾 2张1 蜂窝芯办公室隔间舱门框模板 1中型内阁 2小柜易燃集装箱 L.H.boom内侧襟翼铰链（ 2 ） R.H.boom内侧襟翼铰链（ 1 ） L.H.outboard发动机舱小保险丝CSL的模具霉菌毒素keelgusset 黄体生成素臂船模生殖健康繁荣舷外模具激素上油箱模具相对湿度较低的燃料箱模具普遍安全垫（ 13 ）副翼债券/钻夹具金属看到hooses 5 -奠定表安全垫装饰盒空架办公椅离开组装繁荣正确组装繁荣实用工具车小档案驾驶室套袋材料黑色med。

When has the vehicles after the caterpillar band, vehicles' kinetic energy transmits through the friction gives the caterpillar band, then drives the gear cluster, finally causes the generator electricity generation.

当有车辆经过履带时，车辆的动能通过摩擦传递给履带，然后带动齿轮组，最后使得发电机发电。

The typical spot symptoms on fruit would decrease the production and merchandise of tomato in the heavy rain of June and July; therefore, the key period for disease control is after rainy season. Quick identification on pathogen was using PCR. 1476bp band was amplified by primer P3、P4of bacterial speck. By using primer CMM5、CMM6 for bacterial canker, 614bp fragment was amplified. These PCR tests provided important foundation for pathogen identification and disease diagnoses. Using primer RST65 and RST69 for bacterial spot, expected 420bp band was not amplified.

通过聚合酶链式反应对病原进行快速鉴定，证明加工番茄细菌性斑点病用引物P3、P4可以得到一条大小为1476bp的特异性条带，番茄细菌性溃疡用CMM5、CMM6可以扩增出一条大小为614bp的特异性条带，这为病害的快速诊断打下了基础，但利用引物RST65和RST69对番茄细菌性疮痂病进行鉴定，没有得到预期420bp的目标条带，故对细菌性疮痂病的快速检测还有待继续研究。

Nowadays, most of research are to build a transmutative Petri Nets through adding controlling place sets, controlling arc sets and controlling policy to the basic Petri Nets, while the Controlled Petri Nets could be used to argue many controlling theory problems conveniently and to induce many logically and physically supervisory and solve the Event Feedback Controlling Problems and State Feedback Controlling Problem in DEDS supervisory theory.

目前大多数的研究表现为在变形后的受控Petri网基础上，利用各种方法求得各种逻辑型、结构型控制器，解决DEDS监控理论中的事件反馈控制问题与状态反馈控制问题。

On one hand, there are discussions with the works council and union about extension of short time working up to the end of September.

一方面，有讨论，工程理事会和联盟关于延长工作时间短至9月底。