查询词典 frequency

The channel property of frequency selective fading and Doppler frequency shift are the biggest challenge to the broadband mobile communication service.

在信道的衰落特性中，对宽带无线移动业务影响最大的是多径衰落和多普勒频移。

This paper develops a high-frequency welding power source with double-ended flyback topology.based on SG3525 a new type of control program is designed which with controlled pulse energy output characteristics, pulse width and frequency can be controlled, to control output energy.

本文给出一种基于双端反激式主电路拓扑和SG3525 PWM控制芯片，研制了一台高频脉冲能量可控式焊接电源，该电源通过对输出电流的脉宽和频率单独控制，从而控制输出能量。

In this paper, a kind of 300MHz frequency source is designed by means of combining DDS with analog frequency doubler.

本文提出了一种DDS和模拟倍频器相结合的方法，用来产生300MHz核磁共振实验所需要的射频频率。

The system is comprised of a 12 low frequency driver and a large-format, high frequency compression driver, coupled to a constant-directivity 90° x 40° horn.

该系统是由一个12低频驱动器和一个大型的格式，高频压缩驱动器，加上一个恒定指向90 °× 40 °角。

Nowadays, the high voltage output frequency of PDP driver ICs is improved year by year, as for the increase of the panel size and the requirement of high definition image. Because the power consumption is in direct ratio to the output frequency, the significance of low power consumption design is more and more obvious

特别是随着显示图像质量的提高，以及平板显示器尺寸的增大，使得驱动芯片的工作频率不断提高，功耗也就随之增大，低功耗方面的设计就显得尤为重要。

A spinning machine, especially a ring spinning frame, includes at least one driver started via one frequency converter and one central control unit for starting the frequency converter.

一种纺纱机，特别是一种环锭细纱机，包括至少一个能通过一变频器启动的驱动和一用来启动变频器的机器中央控制单元。

DTV frequency includes in overall semiconductor sale / the chip on video board, and the chip in other type TV, include an input / output circuit, driver, frequency and power source.

总体半导体发卖额中包括DTV音频/视频板上的芯片，以及其它类型电视中的芯片，包括输入/输出电路、驱动器、音频与电源。

We started with a powerful 12", long-excursion low frequency driver for abundant bass punch and accurate low midrange. Next we joined a high-resolution 1" HF driver for clarity and brilliance with a groundbreaking horn design, ensuring smooth frequency response and ultra-wide sound dispersion so you can move around the stage.

这款产品配有功率强大的 12 英寸长冲程低频驱动器，提供铿锵有力的低音和精准的中低频；高解析度 1 英寸高频驱动器和设计新颖的号筒，提供明亮通透的高音，确保平滑的频率响应和极大的声音扩散角度，使你能在舞台上自由跑动。

Moreover, the IGBT radio frequency amplification phenomena, can become relevant if the driver circuit generates high frequency conducted noise components, that can be transferred to the final stage and amplified, generating very high EMI levels.

此外，如果驱动电路产生的高频传导噪音被放大传递到末级，相应的IGBT射频放大现象可以产生更高的EMI。

Comparing with the equation of common machine tools, this equation has three characteristics: It includes the variable frequency driver's energy loss;The variable frequency driver's no-sine voltage wave causes mechanical pulse losses in mechanical driving system;Equivalent palstance of main driving system is of uniform continuity.

该方程相对于普通机床功率平衡方程，具有变频器自身存在较大的能量损耗、变频器输出的非正弦波形电压带来的电气谐波损耗和机械传动系统的机械脉动损耗、主传动系统当量角速度具有一致连续性等三个重要特点。

It was just a normal day of school

那只是上学的普通一天

Which is a very good reference in this issue.

这是一个在这个问题上很好的参考。