| 1. | Direct sampling theorem of band - pass signal
带通信号的直接采样理论 |
| 2. | Direct sampling theory of signal
信号的直接采样理论 |
| 3. | Realization of quadrature coherent detection by direct sampling of if signal
直接中频采样实现正交相干检波的研究 |
| 4. | Direct sampling method
直接取样法 |
| 5. | Workplace air . determination of methyl formate and ethyl formate . direct sampling - gas chromatographic method
作业场所空气中甲酸和甲酯和甲酸乙酯的直接进样气相色谱测定方法 |
| 6. | Extraction of the in - pulse characteristics of signal based on direct sampling from if signal and quadrature coherent detection
基于中频直接采样正交相干检波技术的信号脉内特征提取 |
| 7. | The xenoliths in the yangyuan , including iherzolite and harzburgite , represent the direct samples from the upper mantle beneath western north china craton
阳原幔源包体包括二辉橄榄岩和方辉橄榄岩，是华北西部上地幔的直接样品。 |
| 8. | A data collection and control : high speed direct sampling and effective value calculation of ac voltages and currents , calculation of active power reactive power power factor , collection and transmission of states , select - check - execute of control output
交流电压电流信号的高速实时采样和有效值计算有功无功功率因数计算各交流量的2 15次谐波分量及谐波总量计算遥信量的采集及上送遥控返校及执行。 |
| 9. | The architectures of the receiver are rf pass band direct sampling and if pass - band sampling with high - speed analog to digital converter after rf to if conversion . the first kind of architectures is hard to realize because of the requisition of devices is too high
软件无线电接收机分为射频直接带通采样和将射频信号变换到中频后再进行带通采样，前者实现较难，对器件的要求太高，然后进行各种数字处理。 |
| 10. | Presents the development of modern signal processing techniques , a new implementation method which realizes quadrature coherent detection by direct sampling of if signal generated during the implementation of traditional quadrature coherent detection with analog elements in the form of two parallel baseband channels where in phase ( i ) and quadrature ( q ) components of ceived if singnal where , the imperfect matching of the separate channels due to the analog elements results in high phase and amplitude which meets the needs for high performance radar signal processing , the elementary principles and the implementation process for each method and concludes from simulation results to compare their features and application conditions that the new approach can satisfy of the requirements of high performance sp
针对近年来提出的通过直接中频采样来实现正交相干检波的方法，分析了其基本实现原理，并用统一的观点解释了迄今为止国内外基于此提出的各种实现方法；对每一实现方法的基本原理和实现过程都作了分析，并给出了计算机仿真结果；在此基础上比较了各方法的性能指标及适应条件.理论分析和仿真结果证明，这一方法完全可以满足高性能信号处理的要求 |
