总谐波失真

我们使用讯号对杂讯和失真比当作设计规格而非讯号杂讯比是因为，讯号对杂讯和失真比是讯号杂讯比和总谐波失真的集合，也是类比数位转换器动态效能完整的测量。

We use SNDR instead of SNR as our specification because SNDR is a combination of the SNR and the THD specifications and it is an overall measure of ADC dynamic performance .

在给出了这种逆变器的数学模型之后，详细分析了相角调制的三级阶梯波逆变器的各主要参数如导通角、失真指数和总谐波失真度之间的关系。

Based on the mathematical model of the phase modulation inverters , the relations among the major parameters such as switching-angles , DF , and THD in the 3 step level voltage source inverters are analyzed in detail .

方波型逆变器总谐波失真度（THD）与其负载Q值的关系

Relations between total harmonic distortion ( THD ) and load quality ( Q ) in square wave VSIs

分析了这种电压源逆变器的主要参数，如总谐波失真度（THD）和失真指数（DF）。

The major parameters such as THD and DF of this VSI are analyzed .

xDSL调制解调器变压器总谐波失真的影响因素分析

Analysis of Factors Affecting Total Harmonic Distortion of Modem Transformer for xDSL Telecommunication

内部的功率因数校正（PFC）电路以临界导通模式（CCM）工作，可获得高功率因数、低总谐波失真（THD）及直流电压调整。

PFC circuitry operates in critical conduction mode ( CCM ) and provides for high PF , low THD and DC bus regulation .

运用了数字信号处理技术，可以得到测试非线性器件总谐波失真（THD）的方法。

Using the digital signal techniques , we can get the model of total harmonic distortion ( i.e. THD ) of the nonlinearity device .

由于前置了功率因数调整器，使系统的功率因数和总谐波失真表现良好，而基于原边控制的控制器能够精确的控制LED电流，并且省去了光耦和二次测控电路，有效的减小了体积。

The power factor correction makes the system power factor and total harmonic distortion performance well . Controller can precisely control the LED current upon primary side regulated ( PSR ) . It spare optocoupler and secondary side regulated control circuit .

对于方波型逆变器，总谐波失真度（THD）不仅仅随占空比变化，而且受负载类型的影响。

In square wave voltage source inverter , total harmonic distortion ( THD ) is not only the function of duty cycle , but also with response to load 's type .

正弦脉宽调制（SPWM）和空间矢量脉宽调制（SVPWM）由于具有总谐波失真度（THD）小、开关频率恒定、实现方便等优点而在传统逆变器中得到了最为广泛的应用。

Sinusoidal pulse width modulation ( SPWM ) and space vector pulse width modulation ( SVPWM ) techniques are widely used in traditional inverters for low THD , constant switching frequency , convenient realizations etc.

在SPEC-4实际上有较低的总谐波失真低于其更昂贵的兄弟互调失真。

The SPEC-4 actually had lower total harmonic distortion and lower intermodulation distortion than its more expensive brother .

有源PFC可以得到较高的功率因数，总谐波失真（THD）小，可以在较大电压范围内工作，已经成为提高电源功率因数的最主要方法。

However , APFC is a dominating method of improving the power factor , for APFC , within the vast voltage range , can gain the higher power factor and less Total Harmonic Distortion ( THD ) .

实验结果表明，该逆变电源控制系统设计合理，在电梯能量回馈系统中采用SVPWM技术，既能提高能量回馈逆变电路对直流电压的利用率，又能减少逆变电能总谐波失真。

Experimental results show that the inverter control system is designed reasonably . SVPWM technique which is adopted in the elevator with energy feedback system can raise the energy utilization of the DC voltage for inverter circuit feedback , and reducing the total harmonic distortion of the inverter power .

结果显示总谐波失真小于9%。

Total harmonic distortion below 9 % is obtained .

数字录放音系统的总谐波失真与动态范围及测量

Total Harmonic Distortion and Dynamic Range of Digital Recording System and their Measurement

数字录放音系统的动态范围和总谐波失真与模拟录放音系统相比是有差别的。

The dynamic range and total harmonic distortion of digital recording system are different from analog recording system .

棒棒赛车总谐波失真是一种乐趣，动感十足的赛车游戏，有凉爽的视觉效果和抽水了跑车。

Bang Bang Racing THD is a fun , action-packed racing game that has cool visuals and pumped-up sports cars .

本文讨论了数字录放音系统的动态范围和总谐波失真的意义及其测量原理。

In this paper , the meanings of dynamic range and total harmonic distortion of digital recording system and their measurement principles are discussed .

模拟结果表明：跨导器总谐波失真可达到-59.2dB，输出失调电流136nA。

The stimulating results show that the THD ( Total Harmonic Distortion ) of the transconductor is-59.2 dB and the output offset current is 136 nA .

给出主要的实验结果，对样机网侧功率因数、总谐波失真和效率进行测试分析。

The primary experiment result is given , and the power factor in network side , the total harmonic distortion and the efficiency are tested and analyzed .

给出了详细的功率分配和功率损耗分析，实验和理论结果均表明，这种电压源逆变器具有低开关损耗和低总谐波失真度的特点。

Detailed power distribution and power loss analyses were given . Experimental and theoretical results show that this VSI has lower switching loss and lower Total Harmonic Distortion ( THD ) .

仿真结果表明，在供电电压为5伏，输人差分信号峰峰值为2.3伏的情况下，可以达到小于0.5%的总谐波失真。

Simulation results show that the total harmonic distortion ( THD ) of the output current is less than 0.5 % for the differential input signal of 2.3V ( peak-to-peak ) when the supply voltages are 5V .

然后使用不同的调制方法对逆变器进行调制，并比较两种方法的优缺点，包括输出电压以及电流的总的谐波失真比率。

Two different modulation methods are used to modulate the inverter and their advantages and disadvantages are compared , including total harmonic distortion ( THD ) of voltage and current .