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你好我有一个振幅为1.4Vpp的正弦波。
现在我想为它添加140 mVrms噪声。 我如何进行调整? 由于使用SUM函数,我不能说我想要140 mVrms噪声,但只能定义载波的百分比分数。 但是载波在Vpp中定义,而噪声以mVrms定义。 那么我该如何解决这个问题呢?谢谢 以上来自于谷歌翻译 以下为原文 Hello I have a sine with an amplitude of 1.4Vpp. Now I want to add 140 mVrms Noise to it. How do I make the adjustmentss? Since with the SUM function I can not say I want 140 mVrms noise, but can only define a percental fraction of the carrier. But the carrier is defined in Vpp whereas the noise is defined in mVrms. So how do I resolve the issue? Thank you |
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您好,问题是噪声幅度取决于载波幅度的设置,并且以%表示,并随信号的幅度而变化,并且不会保持固定在xxx Vrms或yyy Vpp(一旦
用户旋钮主振幅SUM信号的“电压”按比例变化。)现在解决你的问题。 首先将振幅设置为1.4VPP,现在按下前面板上的单位按钮,屏幕底部有一些软键,左边第三个显示“Ampl as”。 按蓝色软键并将其从VPP更改为VRMS。 现在应将振幅转换为VRMS,并应显示495 mVRMS。 您想要添加140mVRMS的噪声:140mVRMS / 495mVRMS = 28.28%,因此当您进入调制菜单时,将Sum Amplitude设置为28.28% 以上来自于谷歌翻译 以下为原文 Hello, The problem is that the noise amplitude depends upon the setting of the carrier amplitude, and is added as a %, and will vary as amplitude with the signal, and not remain fixed at xxx Vrms or yyy Vpp, (as soon as the user knobs the main amplitude the “voltage” of the SUM signal changes in proportion). Now to fix your problem. First set your amplitude to 1.4VPP, now press the units button on the front panel, at the bottom of the screen there is some soft keys, the third one from the left says "Ampl as". Press the blue softkey and change it from VPP to VRMS. The amplitude should now be converted to VRMS and should show 495 mVRMS. You want to add 140mVRMS of noise: 140mVRMS/495mVRMS = 28.28%, so when you go into the modulate menu set the Sum Amplitude to 28.28% |
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你好,我研究了SUM对噪声和正弦的运算,结果是一样的,噪声的处理方式与SINE无异。
以下是操作摘要:1。 SUM信号以数字方式添加到FPGA信号发生器中的载波信号中。 输出信号的幅度将增加,以处理载波+和信号幅度。 (载波不减小以保持相同的输出信号幅度)3。 加法是线性单位,没有转换为Vrms,因此使用Vpp单位是量化载波和和信号的不同幅度的最佳方法。例如,如果载波为1.0 Vpp正弦波,则在 和振幅为100%,得到的输出波形的最大振幅为2.0 Vpp。(由于噪声的性质以及示波器的带宽限制和采样,显示的Vpp会有所不同,通常不会达到峰值 2.0 Vpp,但通过添加两个相似频率的正弦波(如1000 Hz和100 Hz)可以更容易地看到这一点。 以上来自于谷歌翻译 以下为原文 Hello, I investigated the operation of SUM for both noise and Sine, and the results are the same, noise is handled no differently than SINE. Here is the summary of operation: 1. The SUM signal is added numerically to the Carrier signal in the FPGA signal generators. 2. The Output signal will increase in amplitude to handle the Carrier + Sum signal amplitudes. (carrier is not reduced to keep the same output signal amplitude) 3. The adding is in linear units, with no conversion to Vrms, so using units of Vpp is the best way to quantify the different amplitudes of carrier and sum signal. For example, if the carrier is 1.0 Vpp Sine wave, and you add Noise at Sum Amplitude of 100%, the resulting output waveform will have a maximum amplitude of 2.0 Vpp. (Due to the nature of noise and the bandwidth limits and sampling of the oscilloscope, the Vpp displayed will vary and usually not appear to reach a peak of 2.0 Vpp, but this is more easily seen by adding two Sine waves of similar frequency, like 1000 Hz and 100 Hz). |
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