频率调制

Four laser beams as 40K and 87Rb cooling and repump lights are obtained by using acoustic optic modulators to offset the frequencies from the three ECDL lasers. Four light beams with the different frequencies are injected into four slave lasers for injection locking, then Rb cooling light, K cooling light and K repump light are injected into a semiconductor tapered amplifier in a master oscillator-power configuration.

采用三台外腔光栅反馈半导体激光器、四台注入锁定激光器和一台半导体激光放大器组成激光系统，三台外腔光栅反馈半导体激光器通过声光调制器产生四束光，分别作为40K和87Rb原子的冷却光和再抽运光，四束不同频率成份的激光分别注入锁定四台从激光器，然后Rb cooling光、K cooling光和K repump光再同时注入半导体激光放大器进行放大。

The laser diode system is composed of three external cavity diode lasers and four injection diode lasers and a tapered amplifier. Four laser beams as 40K and 87Rb cooling and repump lights are obtained by using acoustic optic modulators to offset the frequencies from the three ECDL lasers. Four light beams with the different frequencies are injected into four slave lasers for injection locking, then Rb cooling light, K cooling light and K repump light are injected into a semiconductor tapered amplifier in a master oscillator-power configuration.

采用三台外腔光栅反馈半导体激光器、四台注入锁定激光器和一台半导体激光放大器组成激光系统，三台外腔光栅反馈半导体激光器通过声光调制器产生四束光，分别作为40K和87Rb原子的冷却光和再抽运光，四束不同频率成份的激光分别注入锁定四台从激光器，然后Rb cooling光、K cooling光和K repump光再同时注入半导体激光放大器进行放大。

We use semiduplex sending-receiving incorporating RF electrocircuit and FSK modulating in data sending-receiving system.

数字信号发送与接收电路采用半双工收发一体RF数传模块，采用FSK调制方式，具有良好的频率稳定性以及抗干扰能力。

It includes: Voice morpher to change singer voice in two dimensions, voice pitch and voice timbre, to be either man, woman, young, old, or characterized; Tempo morpher change tempo to faster or slower; Beat tracking with various preset beats, bongos and drum loops; Cher modulation to create cher effect; 31 realtime single effects which can be combined up to 4 layers; and other audio optimizing tools: advanced tune, beat tracking quality controller, frequency morpher, equalizer.

它包括：语音morpher改变歌手的声音在两个方面，语调和语音音色，无论是男人，女人，年轻的，年老，或特徵；节奏morpher变化速度更快或更慢；禁毒跟踪各种预设的节拍，邦戈鼓鼓循环；雪儿调制创造谢尔的影响； 31实时单效应，可组合多达4层；和其他音频优化工具：先进的调，击败质量跟踪控制，频率morpher，均衡器。

It includes: Voice morpher to change singer voice in two dimensions, voice pitch and voice timbre, to be either man, woman, young, old, or characterized; Tempo morpher change tempo to faster or slower; Beat tracking with various preset beats, bongos and drum loops; Cher modulation to create cher effect; 31 realtime single effects which can be combined up to 4 layers; and other audio optimizing tools: advanced tune, beat tracking quality controller, frequency morpher, equalizer.

它包括：语音morpher改变歌手的声音在两个方面，语音音调和音色的声音，不是男人，妇女，青年，老人，或特点；节奏morpher变化的节奏更快或更慢；巡逻跟踪与各预设节拍， bongos和鼓声循环；谢尔调制创造谢尔效应； 31实时单一的影响，可以结合多达4层；和其他音频优化工具：先进的调重弹，击败跟踪质量控制器，频率morpher ，均衡。

Then, based on the properties of DSTM signals, the new algorithm analyzes the demodulated signals and finishes fine-grained CFO estimation.

并且鉴于差分空时调制信号的特点，对解调后的信号进行分析，估计出残余的载波频率偏差。

On the basis of analyzing the oscillatory frequency of crystal oscillator , the general expression of the frequency deviation of crystal frequency modulation oscillator is de rived .

本文在分析晶体调频振荡器振荡频率的基础上，得出了晶体调频振荡器频偏的一般表示式，最佳负载条件下的频偏设计公式和调制级有电流串联负反馈时的频偏设计关系式。

The F1,F2 absorption double lines, which is composed of two lines 6MHz apart, was high sensitively detected by use of the wavelength modulation and harmonic detection techniques.

利用波长调制和谐波探测技术对频率位于6105.626cm~(-1)附近的两条间隔仅6MHz的F1、F2吸收双线进行高灵敏检测，从理论和实验上同时分析了影响本实验灵敏度主要噪声原因。

The filters require close component matching to guarantee that carrier and single-sideband suppression—key measures of quadrature-modulator ideality—do not degrade as a function of baseband frequency.

滤波器需要匹配精密器件，确保载波和单边频带抑制——理想积分调制器的关键——作为基带频率不能降级。

Recent progress in radio prototype has extended the horizons of radio technology by liberating chronics dependence on hard-wired characteristics including frequency band, channel bandwidth, and channel coding. These efforts have led us to the feasibility of dynamically programmable receivers system of software radio.

软件无线电系统的硬件结构与功能相对独立，这样就可以基于相对通用的硬件平台，通过软件实现不同的通信功能，并可对工作频率、系统频带、调制方式等进行编程控制，系统的灵活性大大增加。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。