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bit sequence
相关语句
  比特序列
     A secure pseudorandom bit sequence generator is designed and the bit sequences are then transformed into floating point numbers.
     设计了一种密码安全的伪随机比特序列发生器,再将比特序列转化为浮点数序列。
短句来源
     Using a Logistic map as the chaos generator, the BER is derived in terms of the signal-to-noise ratios, the number of users and the length of bit sequence. The BER and its upper bound for single-user systems are the special cases of this paper. The calculated BERs are consistent with those found from simulations.
     用Logistic映射作为混沌发生器,获得了用信噪比、用户数及比特序列长度表示的误码率(BER)表达式,单用户情况下的BER和噪声性能上界是该文结果的特例。
短句来源
     E-cash is essentially a string of bit sequence,which is easy to be copied. The key concern of E-cash is how to effectively prevent E-cash from being double-spent under preconditions that a legal user's anonymity is well protected.
     电子现金本质上是一串容易被复制的比特序列,如何在保护合法用户匿名性的前提下有效地防止其被重复花费是电子现金研究的关键。
短句来源
  “bit sequence”译为未确定词的双语例句
     The measured rms jitter of output signal via on-wafer testing is 2.2 ps under the stimulation of 231-1 bit-long pseudo random bit sequence (PRBS) at the bit rate of 11.6 GHz.
     在片晶圆测试表明,该芯片在输入速率为11.6GHz、长度为231-1伪随机序列的情况下,恢复时钟的均方根抖动为2.2ps.
短句来源
     The measured rms jitter of recovered clock signal is 4. 7 ps under the stimulation of a 2-1-bit-long pseudorandom bit sequence at the bit rate of 5 Gb/s.
     测试表明:在输入速率为5 Gb/s、长度为211-1伪随机序列的情况下,恢复出时钟的均方根抖动为4.7 ps。
短句来源
     A single channel DR circuit was fabricated in TSMC’s standard 0.18μm CMOS process. The chip area is 0.46mm2.With a 231-1 pseudorandom bit sequence (PRBS) input,the RMS jitter of the recovered 2.5Gb/s data is 3.3ps.
     采用TSMC标准的0·18μm CMOS工艺制作了一个单通道的2·5Gb/s/ch数据恢复电路,其面积为0·46mm2.输入231-1伪随机序列,恢复出2·5Gb/s数据的均方抖动为3·3ps.
短句来源
     The measured rms jitter of recovered clock signal is 4.7ps under the stimulation of a 211-1-bit-long pseudorandom bit sequence at the bit rate of 5 Gb/s.
     输入速率为5Gb/s长度为211-1的伪随机序列时,恢复出的时钟均方根抖动为4.7ps。
短句来源
     The measured rms jitter of recovered clock signal of CRC is 1.6ps under the stimulation of a 223-1-bit-long pseudorandom bit sequence at the bit rate of 8.2 Gb/s.
     单片时钟恢复电路在输入速率为8.2Gb/s、长度为223-1伪随机序列的情况下,恢复时钟的均方根抖动仅为1.6ps。
短句来源
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  相似匹配句对
     sequence.
     序列的情形作了相应的推广
短句来源
     Bit Sequence Generator Based on Symbolic Dynamics
     基于符号动力学的0-1序列发生器
短句来源
     BIT-CORRELATION MATCHING FUNCTION FOR SEQUENCE IMAGE CODING
     一种用于序列图象位移估值的匹配函数——比特位相关匹配函数
短句来源
     K-geometric Sequence
     K-等比数列
短句来源
     Radar BIT design
     雷达机内测试(BIT)的设计
短句来源
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  bit sequence
The bit sequence on the incoming wavelength is converted alternatively to different wavelengths.
      
A bit error rate of 10-9 is measured at 1 Gbps with nonreturn to zero pseudorandom bit sequence (215-1) at a received optical power of -19 dBm.
      
Simulation results of non-return-to-zero (NRZ) pseudorandom bit sequence (27-1 code) at 10, 50, and 200-Gbit/s rates of conversion in an ultra-small silicon-on-insulator waveguide are presented.
      
They claimed to save a factor of two by proposing to divide the packets into halves, routing the first half forward and the second half backward in the bit sequence.
      
In the theory of stream ciphers, important measures to assess the randomness of a given bit sequence are the linear and the jump complexity, both obtained from the continued fraction expansion (c.f.e.) of the generating function of the sequence.
      
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In this paper,the effects of statistical characteristics of the binary sequence to be transmitted(i.e.line sequence)on the design of the line system are analyzed in connection with the line codes used in secondary group PCM,and the definite restrictions on these statistical cha- racteristics are specified.Then,the pulse density of the binary sequence from the 8448 kb/s digital multiplex equipment using 2048 kb/s primary group PCM is estimated,and the quasi-bit sequence independence of 8448 kb/s digital...

In this paper,the effects of statistical characteristics of the binary sequence to be transmitted(i.e.line sequence)on the design of the line system are analyzed in connection with the line codes used in secondary group PCM,and the definite restrictions on these statistical cha- racteristics are specified.Then,the pulse density of the binary sequence from the 8448 kb/s digital multiplex equipment using 2048 kb/s primary group PCM is estimated,and the quasi-bit sequence independence of 8448 kb/s digital channel is definitely described.Finally,it is indicated that an 8448 kb/s digital channel can be made to have the desirable quasi-bit sequence indepedence by adopting a selfsynchronizing scrambler with suitable number of stages.

本文首先结合 PCM 二次群常用的线路码分析数字线路上传输的二元序列(即线路序列)的统计特性对于线路系统设计的影响,从而对线路序列的统计特性提出明确的限制。然后估计使用2048kb/s PCM 基群的8448kb/s 数字复用设备发送的数字序列的脉冲密度,并对8448kb/s数字通道的准比特序列独立性作具体的陈述。最后指出,使用级数适当的自同步扰码器,可以使8448kb/s 数字通道具有所需的准比特序列独立性。

This paper presents a hardware-based approach for generating the m random sequence, taking advantage of characteristics possessed by this sort of sequence. The generating rate is hign. For example, for a 16-bit sequence, the rate is 50MHz/ 16=3.125MHz. Moreover, the period of sequence is long, For instance, with the use of a 24-order shift register, the period of a 16-bit sequence is at least 2~(24)/16=2~(20). Hence the pseudo-random number generated in this way can reappear. Since this method...

This paper presents a hardware-based approach for generating the m random sequence, taking advantage of characteristics possessed by this sort of sequence. The generating rate is hign. For example, for a 16-bit sequence, the rate is 50MHz/ 16=3.125MHz. Moreover, the period of sequence is long, For instance, with the use of a 24-order shift register, the period of a 16-bit sequence is at least 2~(24)/16=2~(20). Hence the pseudo-random number generated in this way can reappear. Since this method is implemented completely by hardware, the generating rate is high; the period is long, while CPU and memory arc not occupied. After the uniform distribution test and independence test, it is proven that the random sequence generated in the presented way is a good approximation of an ideal random sequence.

本文介绍的随机数产生方法利用m序列所特有的性质,完全采用硬件电路产生,产生速率快.若随机数为16Bit,则速率可达50MHz/16=3.125MHz;随机数周期长,若利用24级移位寄存器产生m序列,则16Bit随机数的周期至少为2~(24)/16=2~(20).因此该方法产生的伪随机数可以再现.由于完全利用硬件产生,因此该方法产生速率快,不占用CPU和存贮单元,且能保证足够长的周期.经过均匀性和独立性的检验,该方法产生的伪随机数紧密地近似于理想的随机数.

Most of digital watermarks used now are one-dimensional or two-dimensional pseudorandom sequences. These watermarks have some shortages such as with less information and visually meaningless. So watermark images with more information and good perception are more attractive. However, this type of watermark has too much data payload, which limits its applications. In this paper, we use grayscale image instead of binary image as the watermark image, which is visually meaningful but with more difficulty in...

Most of digital watermarks used now are one-dimensional or two-dimensional pseudorandom sequences. These watermarks have some shortages such as with less information and visually meaningless. So watermark images with more information and good perception are more attractive. However, this type of watermark has too much data payload, which limits its applications. In this paper, we use grayscale image instead of binary image as the watermark image, which is visually meaningful but with more difficulty in its implementation. To deal with the huge amount of data introduced, image preprocessing is adopted before embedding process, in which the watermark image is first decomposed using two layer wavelet transformation and a simple and effective affine technique is used to further decompose the coefficients into bit sequences. By controlling the affine parameter, watermark sequence with less data payload can be obtained. The coarse coefficients and detail coefficients are processed separately with different affine parameter so that the quality of the recovered watermark image can be preserved. To balance the relationship between watermark robustness and imperceptibility, the watermark sequences are embedded into wavelet coefficients of original image with properly selected power control factors. By analyzing the contribution of the bits in different sequences and different position, two conclusions are obtained: (1) coarse watermark sequence is much more important for the reconstruction of watermark image than detail watermark sequence; (2) the significance of different bits in one coefficient is also different. Based on them, we propose a novel adaptive embedding strategy, in which coarse and detail watermark sequences are embedded into coarse and detail coefficients of original image, respectively, and each bit is embedded by its significance order. Experimental results show that the proposed technology can reduce the data payload of grayscale watermark greatly. The watermarked image has good perceptual quality. The recovered watermark image has good quality even under JPEG compression with a quality factor of 30. For other distortions such as Additive White Gaussian Noise (AWGN), image resizing and media filtering, the quality of recovered watermark image is also satisfying. Comparison with common algorithm is shown to demonstrate the effective of adaptive embedding strategy.

目前的大部分水印技术都是侧重于嵌入一维或二维伪随机序列 .由于这类水印固有的缺点如信息量少 ,不具备可视性等 ,具有明显的说明意义及较好可视性的水印图像正得到越来越多的关注 ,但是这类水印数据量太大 ,限制了其应用 .该文提出了一种新颖的基于小波域的自适应灰度级数字水印技术 ,包括水印图像预处理和自适应嵌入策略两部分 .实验结果证明该方法较好地克服了灰度级水印数据量大的缺点 ,并且有效地提高了水印的稳定性 .

 
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