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bit rates
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  比特率
     Compared with embedded zerotree wavelet(EZW),SPIHT and SPECK,the experiment results show that ETSC algorithm has low computational complexity,and increases the encoding efficiency of IWT at low bit rates.
     通过与嵌入式零树小波(EZW)、SPIHT及SPECK算法的实验结果比较,ETSC算法不仅有较低的计算复杂度,而且提高了整数小波变换(IWT)在低比特率下的编码效率。
短句来源
     Very Low Bit Rates Wavelet Subband Speech Compression Coding
     甚低比特率小波子带语音压缩编码
短句来源
     Research on Image Compression Encoding and Deblocking Algorithm at Low Bit Rates
     图像压缩编码及低比特率下去块效应算法的研究
短句来源
     Based on simulations using eight different carrier-serving area ADSL channels show: (1) The proposed MCC and Min-ISI methods yield higher bit rates than the MMSE, MSSNR, and MGSNR;
     通过在8载波服务区ADSL信道上的仿真结果证明:(1)最大信道容量MBR和Min-ISI方法相比传统均衡器设计算法MMSE,MSSNR和MGSNR得到更高的比特率
短句来源
     New Directions in Speech Coding at Low Bit Rates
     低比特率语言编码的新方向
短句来源
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  码率
     Standard Couple image is decomposed and reconstructed with EZW and SPIHT at low bit rates.
     编制程序分别采用EZW和SPIHT算法,在低码率下对标准Couple图像进行了编码和重构。
短句来源
     In 1998, MPEG(Moving Picture Expert Group) integrated diversified multi-media application into a whole framework, and provided MPEG4 video coding standard that is based on content object and meets the standards of different bit rates.
     1998年运动图像专家组(MPEG:Moving Picture Expert Group)将众多的多媒体应用集成到一个完整的框架内,提出了适合各种码率要求的,基于内容对象编码的MPEG4视频编码标准。
短句来源
     Informal subjective test s hows that the quality of speech synthesized by the MMBE is superior to the IMARS AT-M MMBE coder at the same bit rates and is comparable with it at 3.2 kbps.
     非正式主观测试表明 ,在相同码率下由 MMBE重建的语音质量明显优于 IMARSART- M标准IMBE,而在 3.2 kbps下能提供与之相近的语音质量
短句来源
     Design of a Digital Video Server with Very Low Bit Rates
     甚低码率网络数字视频服务器的设计
短句来源
     Compared to H.263v2 (H.263+) or MPEG-4 Simple Profile, H.264 permits a reduction in bit rate by up to 50% for a similar degree of encoder optimization at most bit rates.
     与之前标准相比, H.264不仅比H. 263+和MPEG4节约了50 %的码率,而且对网络传输表现出更好的亲和性.
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  “bit rates”译为未确定词的双语例句
     G.729D-The Extension Coding standard for Low Bit Rates
     低速率扩展编码标准G.729D
短句来源
     A coder of the speech signals at bit rates 16Kb/s is realized using the presented scheme.
     用该方案实现了16Kb/s语音信号自适应预测编码器。
短句来源
     Atthe bit rates of 9.6 kbps for a sinusoidal input signal of 400 Hz, the system has maximum SQNR(SQNRmax) of 18.5 dB, with dynamic range>25dB for SQNR>16dB. At the input frequency of 800Hz,the SQNRmax is 17.5 dB, with the SQNR>15 dB over an input dynamic range 22dB. At 9.6 kbps, a meanword intelligibility is 90%.
     对所研制的系统进行了性能测试,在数码率为9.6kbps时,对于400Hz正弦信号,最大的信号量化噪声比SQNR_m是18.5dB,SQNR>16dB的动态范围大于25dB; 80Hz正弦信号时的SQNR_m是17.8dB,SNR>15dB的动态范围大于20dB,平均单词可懂度为90%。
短句来源
     The modem operate in Bell 103 and Bell 202and CCITTV. 21 and CCITTV. 23 made configuration at bit rates from 300bit/s to 1200bit/s.
     该MODEM用于移频键控(FSK)信号的调制与解调,其工作符合Bell103,202和CCITTV,21,23建议。
短句来源
     The results of the simulation indicate that the receiver sensitivity is -24 dBm (average power, 10-9BER) at bit rates up to 1.25 Gb/s and the maximum receivable optical average power is -4 dBm, so the dynamic range is 20 dB. The minimum packet spacing required to properly recover the first bit in the second packet is 20 ns.
     其仿真结果表明:在传输速率为1.25 Gb/s,误码率BER≤10-9时,接收灵敏度为-24 dBm,最大可接收光功率-4 dBm,动态范围可高达20 dB,两分组信号保护时间为20 ns。
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  bit rates
To operate as wired LAN replacements, these systems will operate at 5.2 GHz and support instantaneous bit rates of just under 24 Mb/s.
      
Under heterogeneous radio conditions, Wireless LAN stations may use different modulation schemes, leading to a heterogeneity of bit rates.
      
These measurements show that artificial light can introduce significant in‐band components for systems operating at bit rates up to several Mbit/s.
      
Advances in lifting-based motion-compensated temporal filtering (MCTF) have enabled highly efficient and flexible spatial, temporal, signal-to-noise ratio (SNR), and complexity scalability to be realized over a wide range of bit rates.
      
MPEG-4 standardizes audio and video compression schemes for a variety of bit rates and scenarios.
      
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The dynamic range of a digital companded delta codec for transmitting voice signals in a lower bit rate is confined within the limit of linearity between the control level of the pulse amplitude modulator and the signal level. This paper describes a coder using a nonlinear network in which the relationship between the control level of the pulse amplitude modulator and the signal level is approximately linear. It is proved both in theoretical analysis and experiment that the dynamic range of the digital...

The dynamic range of a digital companded delta codec for transmitting voice signals in a lower bit rate is confined within the limit of linearity between the control level of the pulse amplitude modulator and the signal level. This paper describes a coder using a nonlinear network in which the relationship between the control level of the pulse amplitude modulator and the signal level is approximately linear. It is proved both in theoretical analysis and experiment that the dynamic range of the digital companded delta codec is improved by using such a coder.

在电话信号低数码率传输时,若使用数字式压伸增量调制器,由于脉冲调幅器控制 电平和信号电平的非线性特性,调制器的动态范围受到一定限制。本文介绍的调制器是 利用非线性网络,使控制电平和信号电平接近线性,因而改善了数字式压伸增量调制器 的动态范围。分析和实验皆证明动态范围的改善是明显的。

A real time digital vocoder which has 2400 b/s data transmission rate, has been developed The speech quality of the vocoder is excellent,and it can be used in low bit rate speech communications. Based upon the acoustics of speech and information theory of chinese characters, we have designed a 2400 b/s digital channel vocoder by means of the simulation in a general-purpose computer and implemented this vocoder hardware by TTL small and medium scale integrated circuits. The listening tests have proved...

A real time digital vocoder which has 2400 b/s data transmission rate, has been developed The speech quality of the vocoder is excellent,and it can be used in low bit rate speech communications. Based upon the acoustics of speech and information theory of chinese characters, we have designed a 2400 b/s digital channel vocoder by means of the simulation in a general-purpose computer and implemented this vocoder hardware by TTL small and medium scale integrated circuits. The listening tests have proved that synthetic speech intelligibility and naturalness are both satisfactory. Moreover, hardware is. simple. Thus it can be adapted for communication engineering.

一个能实时工作的2400 b/s数字化声码器已研制成功。该声码器具有较好的语言质量,适用于低数码率的语言通信。 我们在语言声学和汉语信息理论研究的基础上,借助通用计算机非实时地模拟了2400 b/s的数字通道声码器,并用TTL高速中小规模集成电路实现了该声码器硬件。试验表明,合成语言的可懂度、自然度较好,而且硬件体积较小,适合于通信工程应用。

The light pulse shape at the input of the optical receiver is determined from the modecoupling and losses in the step indent multimode fiber. The optical fiber communication system is designed by taking into account the coupling coefficient between the light source and optical fiber and the mode loss factors as channel parameters. From this the sansitivity and the desired filter of the receiver are also determined. The power margin of the optical fiber relay system is determined from the loss transfer function....

The light pulse shape at the input of the optical receiver is determined from the modecoupling and losses in the step indent multimode fiber. The optical fiber communication system is designed by taking into account the coupling coefficient between the light source and optical fiber and the mode loss factors as channel parameters. From this the sansitivity and the desired filter of the receiver are also determined. The power margin of the optical fiber relay system is determined from the loss transfer function. The bandwidth of the optical fiber transmission system is characterized by risetime of light pulse. The result of numerical computation shows that for low and middle bit rate and short distance optical fiber system we can use a Gaussian pulse waveform equivalent for the shape of the light pulse received by the detector and simplify the system design.

本文从多模阶跃光纤的模式耦合和损耗来确定光接收机输入端的光脉冲波形,并以光源—光纤耦合系数和模式衰减系数作为信道参数,对光纤通信系统进行设计,由此确定接收机灵敏度和需要的接收机滤波器;利用损耗传递参量确定中继系统功率容限;用上升时间来描述光纤系统的带宽。数字计算的结果表明,对于低、中速率,短距离光纤系统,探测器接收的光脉冲波形可以用高斯脉冲波形来等效,从而简化系统的设计。

 
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