频率变换 meaning in English
channel rotation
frequency change
frequency conversion
frequency tra lation
frequency transformation
frequency translation
frequency transposition
frogging
Examples
- The frequency conversion technique applied universally in the field of solid - state laser is studied : the second harmonic wave theory on the base of the coupled wave theory . the effect of phase - matching upon conversion efficiency is mainly analyzed
本章还分析了固体激光领域普遍采用的频率变换技术：建立在耦合波理论上的二次谐波理论，重点分析了相位匹配对转换效率的影响。 - Direct modulator converts baseband signal to rf signal without upconvertion . the system design is relatively simple compared to upconversion . so direct modulator provides adventages of compact size , low cost and low spurious response
直接调制将基带信号直接转换为射频信号,不需要二次频率变换,与上变频方式相比系统结构简单,降低了对滤波器的要求,具有体积小,重量轻,成本低等明显的优点。 - The three - phase high - frequency ac pulse density modulation ( pdm ) converter , which is proposed in this paper , can efficiently synthesize low - distortion variable frequency variable amplitude low frequency voltage signals from the fixed - frequency voltage of the high frequency link
本文阐述的高频交流脉冲密度调制( pdm )的控制策略能够较容易地将高频交流信号低失真地合成幅值和频率变换的低频信号。 - The main works are as follows : 1 . the paper systematically describes basic concepts and theories that form the foundation for design of general microwave filters . the topics will cover filter transfer function , lowpass prototype filters , frequency transformations , immittance inverters and the passband insertion loss under the influence of the dissipation of filter elements 2
现总结如下: 1 .对微波滤波器的设计理论进行系统的分析,阐述了微波滤波器的传输函数、低通原型、频率变换、倒置变换器以及元件损耗对带内插损的影响等方面。 - So qpm enlarge the application range of the crystal in existence . presently diode pumped all - solid - state lasers have been developing quickly , which provides an ideal pump source for qpm . so lower power all - solid - state laser frequency conversion by qpm has been becoming a research focus
近年来，随着激光二极管( ld )技术的发展，小功率全固态激光器已经十分成熟，为准相位匹配提供了优质的泵源，因此，小功率全固态激光器的准相位匹配频率变换成为目前的一个研究热点。