low frequency modulation
英 [ləʊ ˈfriːkwənsi ˌmɒdjʊˈleɪʃən]
美 [loʊ ˈfriːkwənsi ˌmɑdʒəˈleɪʃən]
低频调制
双语例句
- The low jitter transmission of pulse signals is realized by direct RF-modulation based on PLL frequency modulation.
介绍了锁相调频的基本原理，用锁相调频的射频直接调制方法实现了脉冲信号的低抖动传输。 - This sensor featuring plane-convex lens collimator for expanding beam and coupling, and a low frequency for light pulse modulation is introduced.
利用平-凸透镜准直器作扩束耦合光学系统，采用低频斩光器实现光调制。 - Then high frequency distinguished rate and much low spurs could be realized in a single loop PLL frequency synthesizer to carry out many kinds of digital modulation and predigest the structure of many signal generators.
并能方便实现各种数字调制，大大简化各种信号发生器的结构，成为一种先进的锁相频率合成方式，得到广泛的应用。 - Choosing proper orthogonal wavelet function, the low frequency sub-band was enhanced obviously and the high frequency sub-band was restrained moderately to realize image enhancing via the modulation of information entropy window.
选择适合的正交小波函数，可使图像的低频子带大幅度提升，对高频子带适度抑制，在信息熵窗系数的调配下实现了图像的增强处理。 - For the weak interaction and the extremely low Alfv é n frequency, it is usually hard to observe the cross modulation between IAR and HF waves.
由于这种调制作用比较微弱以及阿尔芬波频率极低，从而导致ULF磁流体波对高频波的调制效果不易观测到。 - To explain the peaks observed in the low frequency range of the modulation response of the integrated light sources, we measured the relative intensity noise spectra of the DFB LD and the modulation response of the EA modulator at different reverse biases.
针对在DFB-LD/EA集成光源小信号调制响应曲线低频段观察到的异常起伏，测量了DFB-LD的强度噪声谱，比较了不同反向偏压下EA调制器的调制响应。 - The control scheme is easily realized, and the algorithm for it is simple. It has a low switching frequency and a high voltage modulation coefficient.
这种方法算法简单，容易实现，开关频率低，电压调制系数高。 - Speedy calibration of low frequency vibration transducer by using linear frequency modulation signal
利用调频信号实现低频振动传感器的快速校准 - The phenomenon that the effect of the high frequency modulation is better than that of the low frequency modulation is explained, and general rules of choosing modulator parameters are also presented.
解释了高频调制效果比低频调制好的实验现象，并且给出了确定调制器参数的一般原则。 - A New Type Metering Pump with Low Flow Volume Design on Topping up Pump in Aerodynamic Frequency Modulation
一种新型小流量计量泵&气动调频注液泵的研究 - Due to the low PAPR, single-carrier systems based on orthogonal frequency division multiplexing ( OFDM) modulation is a promising technique for the uplink of the 3GPP LTE.
在3GPPLTE的上行方案中，基于OFDM的单载波系统因为其PAPR比较低的优势，成为最有竞争力的备选方案。 - Its control method is PWM and PFM modulation. The adoption of PFM decreasing frequency modulation and touch starting arc is safe and reliable. Linear energy can be controlled by low frequency modulation to high frequency pulse.
该电源采用PWM和PFM混合调制的控制方式，引弧为PFM降频调制的小电流接触引弧方式，引弧过程安全可靠，通过对高频脉冲的低频调制达到控制线能量的目的。 - A kind of Laser source with APC, ATC and modulation interface is introduced and It's low-( frequency) modulation characteristics are deeply studied.
介绍了一种具有自动功率控制（APC）、自动温度控制（ATC）及调制输入接口的半导体激光光源，并对其低频调制特性进行了深入的实验研究。 - A low frequency wavelength modulation spectroscopy is acquired with an external cavity tunable diode laser. The wavelength modulation is achieved using the voltage tuning by scanning the piezoelectric stepper motor with rotating of the end mirror in the laser cavity.
对单模、可调谐外腔式二极管激光器采用调节激光外腔压电电压的方法实现波长调制，利用数字锁相放大器处理光谱信号的高次谐波。 - This thesis introduces a series of low cost high precision Linear Frequency Modulation Continuous Wave ( LFMCW) ranging radar.
本文介绍一种低成本、高精度线性调频连续波（LFMCW）测距雷达。 - A Low Power Frequency Modulation Transmitter Circuit
一种低功耗调频发射电路 - At the same time the lamp current is keeps a perfect sine wave, which means low lamp current crest factor is achieved. Frequency modulation with power control is implemented.
T型滤波器可以实现很窄频率范围的深度调光，同时实现低的灯电流波峰因数，保持灯电流呈完美的正弦波。 - First, a low frequency tone is up-converted to the needed frequency range by means of SSB ( single side band modulation).
其思路是将信号先通过单边带调制，将较低频率调制到需要的频率范围； - According to the low resolution of significantly time-varying signal analyzed by conventional STFT ( Short Time Fourier Transform), this paper introduces an improved algorithm that considers coefficient of frequency modulation into window function.
针对传统短时傅里叶变换（STFT）对时变显著信号分辨率不高的缺点，提出了一种对窗函数加调频系数的改进算法，用VC程序予以实现； - Due to low amplitude fluctuation and excellent frequency and amplitude modulation capability, diode lasers have been excellent light sources for investigating absorption spectra of atoms and molecules especially in the wavelength region of the near infrared, which coincides with most atomic and molecular transitions.
由于半导体激光器功率稳定、波长连续可调，尤其在近红外波段，其波长覆盖了大多数原子／分子的跃迁谱线，因此半导体激光器已成为原子／分子吸收光谱测量中的一种很好的光源。 - As we know, Σ-Δ modulation technique has the advantage of suppressing the low frequency quantization noise, so it is frequently applied in the modulation circuit of class D.
众所周知，∑-Δ调制技术由于其具有抑制低频量化噪声的优点，因此在D类放大器的调制电路中得到广泛应用。 - After research the low speed signal based on the way of modulation signal top load in original signal, the frequency modulation and the depth of the change cause 10 G and 40 G optical fiber communication system OSNR and nonlinear price.
研究此基于调顶方式的低速随路信号加载后，其频率和调制深度的改变引起10G和40G光纤通信系统OSNR以及非线性代价。 - A modulation structure is proposed, which gets low gain mismatch by reducing the mismatch of varactors and improving the linearity of frequency modulation gain. Compared to other solutions, the proposed technique does not require additional calibration circuits, thus complexity and power is reduced.
本文提出一种减小失配的结构，通过减小可变电容失配和提高调制增益线性度实现，相比其他方案，不需要使用校正电路，实现低功耗和低复杂度设计。 - Using hydro energy to generate power is generally considered as one of economic energy converting ways. Compared to thermal power generation and nuclear power generation, it has merits of low cost, easy to administrate, enabling fast, low pollution, peak modulation and frequency modulation.
水能发电是公认的比较经济的能量转化方式之一，它与火力发电与核能发电相比有着成本低、运行管理简单、启动快、污染小、调峰调频等优点。 - To improve the system detection sensitivity, the paper studied the effects of the system detection sensitivity factors. To avoid low frequency noise interference and improve system detection sensitivity, we proposed wavelength modulation and second harmonic detection methods.
为提高系统检测的灵敏度，论文研究了影响该检测系统检测灵敏度的因素，提出了波长调制方法和二次谐波检测方法，以避免低频噪声的干扰并提高系统检测的灵敏度。 - This basic source has both the merit of DDS such as low resolution, easy to realize the frequency modulation and phase modulation, and the narrow-band tracing filter merit of PLL to obtain the low spurious.
这个基本信号源既有DDS的细步进，容易实现数字调频和调相的优点，又能有锁相环良好的窄带跟踪滤波特性相结合的低杂散的优点。