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data rates
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  传输速率
     Standards HIPERLAN/2 defined by ETSI BRAN and 802. 11a defined by the IEEE provide the channel adaptive data rates being up to 54Mbps in the 5 GHz radio band.
     在业界制定的无线局域网标准中最具代表性的是ETSI BRAN的HIPERLAN/2和IEEE802.11a,这些系统都支持在5 GHz的无线频段中提供高达54 Mb/s的信道传输速率.
短句来源
     When tested in a lake, the bit rate reached 8 3KB/s within 7000m with the bit error rate (BER)between 10~(-2)∶10~(-5). Experiments have shown that by this method the effect of ISI can be reduced and the system can reach high data rates with low BER.
     湖试中,在7 000m距离内,传输速率达到8. 3KB/s,误码率10-2∶10-5.试验证明该方法可以有效降低码间干扰的影响,达到较高的传输速率和较低的误码率.
短句来源
     ZigBee enables low data rates, low power consumption and cost-effectiveness, and is more applicable to industrial monitoring system, sensor networks, home monitoring system and security system.
     整个协议的设计使得ZigBee技术具有数据传输速率低、功耗低、成本低等特点,更加适合于工业监控系统、传感器网络、家庭监控系统、安全系统等应用。
短句来源
     The target of the HSDPA concept is to increase the peak data rates, improve the quality of service, and enhance the spectral efficiency for downlink packet traffic.
     HSDPA的目标是为了增加峰值传输速率,改善服务质量,提高下行分组业务的频谱利用率。
短句来源
     The system mainly consists of high-speed A/D & D/A, programmable DSP module,and multimedia PC,and is completely programmable in terms of frequency band, channel modulation,data rates,etc,debuggable and upgradable.
     系统主要由高速A/D&D/A、可编程DSP模块以及多媒体PC构成,它具有完全的可编程性(如工作频率、调制方式、传输速率等),而且调试和升级非常便捷。
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  数据率
     Practical results show that,in terms of 3bits error correct-ing,algorithms presented in this paper can be applied to real-time BCH coding/decoding computation in the fi elds with data rates up to 31kbps.
     实际运行结果表明,在给定分组内检/纠3bit差错的条件下,笔者提供的算法可在数据率高达31kbps的信道传输条件下完成实时BCH编/译码计算。
短句来源
     The third generation cellular mobile communication system is expected to support various kinds of communication services with different data rates and quality of service(QoS).
     第三代蜂窝移动通信系统能以不同的数据率和服务质量(Quality of Service,QoS)支持不同类型的通信业务。
短句来源
     Recently, the global wireless industry has created two new partnership projects, 3GPP and 3GPP2, to address this issue of the limited data capabilities of 2G systems, motivating the PPs to start work on 3G wideband radio technologies that can provide higher data rates.
     最近,全球无线业界已确定了二项新的全球合作计划,即3GPP和3GPP2计划,以解决第二 代系统有限数据传输能力,从而产生了关于能提供高数据率3G宽带无线电技术研究的合作计划 (PP)。
短句来源
     The first proposal still keeps on using the same Fast Walsh Transform (FWT) as used in the decoding process for 5.5 and 11 Mbps data rates. The FWT of the second proposal has been modified to adapt the increased data rates of 16.5 Mbps.
     两个方案的编码过程变化不大,第一方案的译码还是采用5.5和11Mbps数据率所使用的快速WALSH变换(FWT),第二个方案的译码被修改成适合于16.5Mbps数据率的快速WALSH变换(FWT)。
短句来源
     The results of experiments conducted in a lake,summarized in Table 2 in the full paper,show preliminarily the correctness and efficiency of our adaptive MOMC system as the transmission data rates reach 9090bps and 2000 bps in the range of 5 km and 25 km respectively with the bit error rate <10-4.
     湖试结果为误码率<10-4时,5 km通信数据率为9090 b/s,25 km为2000 b/s。
短句来源
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  数据速率
     The 315MHz/433MHz ASK superheterodyne receiver adopts high integrated,low power CMOS,superheterodyne,ASK receiver MAX7033.It has a receiving frequency range of 300 MHz to 450 MHz,the input RF signal range of-114 dBm to 0 dBm,and a data rates of 33kbps manchester data speed.
     所设计的315 MHz/433 MHz ASK超外差式接收机电路采用MAX7033高集成度、低功耗CMOS、超外差式幅移键控(ASK)接收机,接收频率范围为300 MHz~450MHz,射频信号输入范围为-114 dBm~0dBm,数据速率可达33 kb/s曼彻斯特码率(66 kb/s NRZ)。
短句来源
     IEEE 802.11a protocol can provide high data rates as much as 54Mbps, which is also the highest speed in the IEEE 802.11 family.
     IEEE 802.11a协议在其覆盖范围内可提供最高达54Mbps的数据速率,这在现有的IEEE 802.11协议族中是可达到的最高速率;
短句来源
     This equipment is able to generate modulateddata who can change its input data rates、frequency range from 5Mhz to 65Mhz ,etc.
     此装置可产生输入数据速率可调,载波频率5-65MHz的多种数字调制信号。
短句来源
     The reason these high data rates can be achieved using a 1.25 MHz carrier is that lxEV-DO uses higher order modulation techniques. There are three different modulation techniques, QPSK, 8-PSK and 16-QAM, used in the forward link.
     能够在一个1.25MHz的载频上,得到这么高的数据速率的原因是,1X EV-DO网络采用了高阶调制技术,在前向链路上有三种不同的调制技术,即QPSK、8-PSK和16-QAM。
短句来源
     The results of using both techniques show that it could complete the effective collection of the correct data at 1 Gb/s data rates.
     使用这两种技术的结果是在数据速率达到1 Gb/s时,完成对有效数据的正确采集。
短句来源
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  “data rates”译为未确定词的双语例句
     A 0.18 μm 1.8 V CMOS transmitter that implements IEEE 802.3 Ethernet physical layer standards for(10/100) Mb/s data rates is described.
     根据IEEE 802.3协议的指标要求,设计了一种采用0.18μm 1.8 V CMOS工艺的10/100 Mb/s以太网物理层发送电路.
短句来源
     Clock Recovery from Degraded Signals at 10, 20, 40 Gb/s Data Rates
     10、20、40Gb/s速率下恶化信号的光时钟提取
短句来源
     TD-SCDMA system is difficult to support different radio access data rates,such as vehicular environment: 144 kbit/s,pedestrian environment: 384 kbit/s,indoor office environment: 2.048 Mbit/s,which are required by 3G standards.
     TD-SCDMA标准很难提供3G标准所规定的在车载、步行、静止环境下分别达到144 kb it/s、384 kb it/s和2 048 kb it/s的无线接入速率要求。
短句来源
     The experiment proves that the underwater acoustic data communication system can provide data rates about 200 bits/s and the BER is under 10 ~5 - 10~6.
     实验表明,该水声数据通信系统的传输波特率为200bits/s,误码率达到10~(-5)~10~(-6)以下。
短句来源
     In this context, the 3GPP introduces a new feature in the Rel5 specifications denominated High Speed Downlink Packet Access (HSDPA). The target of the HSDPA concept is to increase the peak data rates, improve the quality of service, and enhance the spectral efficincy for downlink packet traffic.
     在这样的背景下,3GPP在Rel5版本中提出了高速下行链路分组接入(High Speed Downlink Packet Access HSDPA),旨在增加下行链路分组业务的峰值速率、提高QoS并增加频谱效率。
短句来源
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  data rates
It can easily deal with modulation and demodulation of the signals with different modulation schemes and data rates by only setting a few input arguments of the versatile software modules.
      
Space-Time Coding (STC), which combines channel coding, modulation, and multiple transmit antennas, is a powerful scheme to achieve higher data rates and combat fading in wireless systems.
      
Experimental results showed that parallel channels of Fast Ethernet are both necessary and sufficient for supporting the data rates of multiple concurrent file transfers on file server.
      
Orthogonal variable spreading factor channelization codes are widely used to provide variable data rates for supporting different bandwidth requirements in wideband code division multiple access (WCDMA) systems.
      
Dual parallel channels of commodity 100 Mbps Ethernet are both necessary and sufficient to support the data rates of multiple concurrent file transfers.
      
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A method of pitch extraction by Linear Prediction Code (LPC) analysis with predeter-ming voiced sounds is presented in this paper. At first, the voiced parts in speech signal is identified by the difference a0-a1, where a0=1 and a1 is the first coefficient of linear predictor, then only the voiced parts are processed to extract the pitch period. When pitch detecting, the data rate is compressed by half, the 8 coefficients of inverse filter are calculated by autocorrelation LPC method, and then for the...

A method of pitch extraction by Linear Prediction Code (LPC) analysis with predeter-ming voiced sounds is presented in this paper. At first, the voiced parts in speech signal is identified by the difference a0-a1, where a0=1 and a1 is the first coefficient of linear predictor, then only the voiced parts are processed to extract the pitch period. When pitch detecting, the data rate is compressed by half, the 8 coefficients of inverse filter are calculated by autocorrelation LPC method, and then for the residual signal, the output of the inverse filter, the pitch period is extracted by the Average Magnitude Difference Function (AMDF) method, and the curve of pitch period is linearly interpolated and nonlinearly filtered.The results obtained by our method is compared with those obtained by a semi-automatic pitch detector and by SIFT method. It is shown that the algorithm presented in this paper is quite precise and effective for continuous speech with background noise below 40 dB. It is unnecessary toalculate the pitch periods in voiceless sounds and silence periods, and the classification of voiced or unvoiced sounds is rather precise.

本文介绍一种预分浊音型的LPC基音提取算法,对语言信号先用线性预测系数a_0和a_1的差值分出浊音区,然后只对浊音部分进行基音提取。提取基频时,数据率减半,用LPC的自相关方法产生8个预测系数的倒滤波器,倒滤波后的误差信号,用平均幅差函数(AMDF)方法提取基频,再线性插值,最后用非线性平滑滤波,并将所得结果和一个半自动的精确算法,以及简化倒滤波(SIFT)算法进行比较,说明我们提出的算法,对背景噪声40dB以下的连续语言是准确有效的。它避免了清音和无声间隙区的音调计算,且浊音和清音的判别比较准确。

In modern laboratories, data acquisition and processing is very im-portant. Especially in experimental high energy physics. Since the experimental eq-uipments are enormous and complicated, it requires high experimental data rate.Therefore data acquisition and processing become even more obvious. In order tosuit the needs of high energy physics, and to enhance reliability and flexibility ofexperiments, we have established DJS-130 multi-crate CAMAC computer on-linesystem. This system can be used...

In modern laboratories, data acquisition and processing is very im-portant. Especially in experimental high energy physics. Since the experimental eq-uipments are enormous and complicated, it requires high experimental data rate.Therefore data acquisition and processing become even more obvious. In order tosuit the needs of high energy physics, and to enhance reliability and flexibility ofexperiments, we have established DJS-130 multi-crate CAMAC computer on-linesystem. This system can be used also in other fields. The whole system consists ofa DJS-130/CAMAC branch driver, crate controller type-A and a variety of func-tional modules. In this system, the units are standardized, except the branch driverwhich is directly connected with the computer. Program designer may use assemblelanguage or other high level language. The DJS-130/CAMAC branch driver is aninterface of DJS-130 computer to the CAMAC crates. It is connected to the compu-ter through the bus driver and changes the control and status information to satis-fy communication requirements. The LAM processing procedure is as following. Ifa BD demand is sent by a crate to the branch highway and if it is not busy, itwill execute BG operation automaticly while executing BG operation. The datawords on BRW line will be latched onto data register (used as GL register), thenthe branch driver issues interrupt request to the computer may receive this inter-rupt request, thus it will be acknowledged. Crate controller type A is a standardequipment. It is essentially an interface of CAMAC dataway to the branch highway. It is indenpendent on the type of computer. The crate controller we developedconforms with the mandatory requirements of the CAMAC specification on electri-cal performance. In a CAMAC system, the functional modules are the executiveunits. Different modules may have different functions. Several kinds of CAMACmodules have been developed in our laboratory: counter, coincidence register, realtime clock generator, CRT display driver and dataway status, etc.

在近代实验室中,实验数据的获取与处理已经成为很主要的问题,特别是在高能实验物理中,由于实验设备非常庞大复杂,数据率高、数据量大,所以数据获取与处理则显得更为突出。为了适应高能物理的需要,增强实验设备的可靠性与灵活性,我们建立了一套配合DJS-130机的多机箱CAMAC在线系统。这一系统也可用于其他领域中。整个系统由DJS-130/CAMAC分支驱动器。A_1型机箱控制器和各种功能组件组成。在这一系统中,除了分支驱动器与计算机直接有连系外,其余部分都是标准化的部件。程序设计可以使用汇编语言,也可使用其他高级语言。DJS-130/CAMAC分支驱动器是DJS-130机与CAMAC系统之间的接口,通过总线驱动器与计算机相连,它的作用是将控制和状态信息与数据进行变换以满足通讯的需要。LAM处理的过程如下,当分支请求BD从一个机箱送到分支通道时,如果分支驱动器空闲就自动执行BG分支操作,在BG操作时,分通道BRW线上BG字锁存到GL寄存器(由数据寄存器代用),然后发出中断请求。如果计算机能够接受此请求,即将转入中断处理。 A_1型机箱控制器是完全标准化了的部件,它是机箱的数据路和分支通道之间的基本接口,与计算机的类型无...

在近代实验室中,实验数据的获取与处理已经成为很主要的问题,特别是在高能实验物理中,由于实验设备非常庞大复杂,数据率高、数据量大,所以数据获取与处理则显得更为突出。为了适应高能物理的需要,增强实验设备的可靠性与灵活性,我们建立了一套配合DJS-130机的多机箱CAMAC在线系统。这一系统也可用于其他领域中。整个系统由DJS-130/CAMAC分支驱动器。A_1型机箱控制器和各种功能组件组成。在这一系统中,除了分支驱动器与计算机直接有连系外,其余部分都是标准化的部件。程序设计可以使用汇编语言,也可使用其他高级语言。DJS-130/CAMAC分支驱动器是DJS-130机与CAMAC系统之间的接口,通过总线驱动器与计算机相连,它的作用是将控制和状态信息与数据进行变换以满足通讯的需要。LAM处理的过程如下,当分支请求BD从一个机箱送到分支通道时,如果分支驱动器空闲就自动执行BG分支操作,在BG操作时,分通道BRW线上BG字锁存到GL寄存器(由数据寄存器代用),然后发出中断请求。如果计算机能够接受此请求,即将转入中断处理。 A_1型机箱控制器是完全标准化了的部件,它是机箱的数据路和分支通道之间的基本接口,与计算机的类型无关。我们试制的机箱控制器在电气性能上满足CAMAC规范的要求。在CAMAC系统中功能组件是CAMAC系统中的执行部件不同的组件可以有不同的功能,目前我们实验室研制的CAMAC组件有:计数器、寄存器,实时时钟脉冲产生器,示波显示驱动器、数据路状态显示器等。

The aluminium nitride (A1N) film is one of the good piezoelectric materials exhibiting high-temper sure and chemical stability and good insulation. It is available for surface acoustic wave (SAW) devices with large electromechanical coupling constants,high acoustic velocities and ex-ellent high-frequency properties. The combination of SAW devices and semiconductors is a general trend today. And the behavior of high frequency and low dispersion of A1N film is promising for the realization of signal processing...

The aluminium nitride (A1N) film is one of the good piezoelectric materials exhibiting high-temper sure and chemical stability and good insulation. It is available for surface acoustic wave (SAW) devices with large electromechanical coupling constants,high acoustic velocities and ex-ellent high-frequency properties. The combination of SAW devices and semiconductors is a general trend today. And the behavior of high frequency and low dispersion of A1N film is promising for the realization of signal processing with large data rate.

氮化铝薄膜耐高温、化学性质稳定、绝缘性能好,是优良的压电材料。氮化铝薄膜机电耦合系数大、声速高、高频性能好,适合于制柞声表面波器件。SAW器件与半导体技术的结合是当前发展的一个重要趋势,AlN的高频和低色散性能有助于解决大数据速率的信号处理器件。 本文概述近期氮化铝薄膜的新发展,薄膜的制作技术、结晶学性质、压电性和声学性能,AlN和ZnO压电薄膜的初步比较、AlN薄膜的应用,特别是AlN薄膜在声表面波技术发展中的动向等。

 
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