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- A Novel Tunable Dual-frequency Laser with Large Frequency Difference 新型大频差可调谐双频激光器
- The small center frequency difference between NBI and spread spectrum signal or the large NBI power will make spread spectrum communication invalid. 但当信道中窄带干扰(尤其是时变窄带干扰)的中心频率和直扩信号的中心频率近似,或功率远大于直扩信号功率时,直扩通信可能失效。
- The design of programmable large frequency band-width precise delay apparatus. 可编程宽频带精密延时器设计。
- A new code acquisition method based on phase difference correction of FFT is presented to solve the problem of long code acquisition time in high dynamic DSSS receivers having large frequency offset. 针对大频偏下高动态直扩接收机伪码捕获时间长的问题,提出了一种新的基于FFT相位精确估计频偏的改进方法。
- After the frequency difference is compensated, the method of TDE is presented. 最后给出了频差补偿的时延估计方法。
- The photocurrent frequency difference is proportional to rotational velocity. 实验验证了该方法的可行性。
- The obtained maximum frequency difference was 1.3GHz, the minimal was 50MHz because of the strong mode competition. 实验中得到双频激光稳定运转时频差的上限约为1.;3GHz; 由于强模竞争现象的存在;实验中所观察到的频差下限为50MHz
- This paper presents a structure based on noncoherent-SPRT algorithm for the sequence acquisition under large frequency offset and low signal to noise ratio in DS/SS systems. 该文研究大频偏低信噪比情况下DS/SS系统中的序列捕获问题,介绍了一种基于非相干序贯检测算法的捕获结构。
- Based on the experimental data, some performance parameters of sensor are evaluated, and the function formula between wetness and frequency difference is matched. 根据测量数据，对传感器的部分性能指标进行了评估，得出了湿度与频差间的函数关系。
- The precision of the ultrasonic flowmeter with small tube diameter and frequency difference method is affected by several factors,so to gain more accuracy is difficult. 小管径频差法超声波流量计的测量精度受各种因素的影响，因而获得较高精度比较困难。
- The method for generating the second signal is put forward based on the period rule of the phase difference for two frequency signals with the frequency difference. 摘要利用两个有一定频差的频率信号相位差变化的周期性规律提出了一种秒信号产生方法。
- Compared with the energy centrobaric correction method, the proposed method is not well for the signal of large frequency intervals and is well for the signal of smaller frequency intervals. 而对密集频谱的校正，全相位法则要好于能量重心法。
- By researching the frequency difference between telephone channel and traditional channel, the phantom formants are found, which can be reduced by normalization of its residues. 通过研究电话信道对频谱包络的影响,从留数角度分析虚峰出现的原因,结合留数归一化方法和传统的倒谱均值减,对中间维的倒谱加以提升。
- Abstract: The precision of the ultrasonic flowmeter with small tube diameter and frequency difference method is affected by several factors,so to gain more accuracy is difficult. 文摘:小管径频差法超声波流量计的测量精度受各种因素的影响，因而获得较高精度比较困难。
- He bit off a large piece of the apple. 他咬下一大块苹果。
- One big frequency difference and several little reciprocal prime frequency differences has good ability in anti-noise. 一组大差频与互质参差的多组小差频法则具有较好的抗噪声性能。
- There is a tradeoff, however, because lower resolution ADCs tend to have quantization noise which is correlated to the input signal, thereby producing larger frequency spurs. 这是一个权衡，因为分辨率低的ADC会产生与输入信号相关的量化噪声，从而产生高频激励。
- Large billboards have disfigured the scenery. 大型告示板已破坏了景色。
- This paper introduces a new method for both producing and controlling the frequency difference of a dual frequency laser by using an electromagnetical force which is applied onto the window plate. 提出和研究一种新的方法，即利用电磁铁的电磁力去产生和控制双频激光器的频差。
- He has a large amount of mail to answer every day. 他每天有大量的信件要回复。
