Questions tagged [electrical-signal]

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Doppler shift in police radar

I don't understand how the radar frequency can be extracted from this diagram : (source:https://copradar.com/rdrparts/) and specially i don't understand what is the role of PLL and IF circuits and ...
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1answer
24 views

What does kchip/s datarate mean? [closed]

I am working in w mbus and came across this term kchip/s in datarate like 37.768 kchip/s what does the unit specify?
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1answer
58 views

Nyquist frequency , sampling distance

I have few questions I tried to solve regarding nyquist theorem, and I would like to see your opinion if I'm doing it correctly?(one I know the answer second one not sure). 1.Let $f(x)$ and $g(x)$ be ...
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2answers
76 views

Nyquist sampling

I know that if $f_\mathrm{m}$ is the "Nyquist frequency" (max frequency) and $f_\mathrm{s}$ sampling rate then $f_\mathrm{s}>2f_\mathrm{m}$. Am I correct so far? I have a signal $x(t)$ with max ...
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1answer
373 views

What is the difference between undersampling and oversampling in analog to digital conversion ?

When converting a signal from analog to digital, we observe undersampling and oversampling. Does oversampling means that the sampling frequency is greater that the signal's frequency and does ...
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0answers
354 views

How to envelope a non periodic Impulse signal?

I want to analyse a trc oscilloscope file, find impulses and envelope them. In the end I want to plot the envelope. data file (trc): https://ufile.io/z4m4d Code: (Python) ...
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1answer
65 views

Separating two frequency component

How can we separate two frequency component when they get mixed means when signal get mixed with noise how receiver can judge which part is signal and which is noise ?
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1answer
52 views

Unexpected peaks in power density following downsampling and filtering

I first applied a 100 Hz lowpass filter to my data, which was recorded at 30000 Hz: ...
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0answers
82 views

non-Mel Frequency Cepstral Coefficients

I'm trying to summarize the frequency domain information of an electrical signal as a feature engineering step for a machine learning algorithm. My hypothesis is that an anomaly will appear in the ...
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0answers
24 views

How best to analyse a 130volt +/- 20volt signal?

I want to measure and log a relatively high variable voltage signal, with minimum impact on the original signal. Normally the signal should average 130volts and vary by +/- 20volts at 10Hz. However ...
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1answer
44 views

Time Delay Margin

I have a question regarding the time delay margin. I know the definition of time delay margin now I want to know that for the stability of the system is it good to have large time delay margin or ...
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2answers
261 views

Power Spectrum of the Current of Compact Fluorescent Lamp (CFL) Compared to the AC Input

Is it possible for an AC current (current passing from CFL) to have a harmonic component greater in magnitude than its fundamental? In my country fundamental frequency which carries power is 50 Hz. ...
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2answers
899 views

Problems Using FFT to Compute Impedance in a Model Neuron

I'm a neuroscientist currently investigating the resonance properties of a single neuron model that a colleague and I have constructed. The language we code in is Julia, which I hope is similar enough ...
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2answers
155 views

How to look at Rubidium frequency standard using the oscilloscope?

This question is about the checking hardware, please help if someone who has done it before. I have the Rubidium frequency standard: http://www.thinksrs.com/products/PRS10.htm and the Oscilloscope: ...
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1answer
302 views

How to find analytic description of filtered signal

I am looking for an exact analytic description of a filtered signal. I have an electronic circuit whose input is a monoexponential decay. First (1) the signal gets filtered by a simple RC-Lowpass. ...
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1answer
2k views

Why NRZ-L and NRZ-I line coding have DC component?

I can find the effect of having a DC component in the Internet which is "When the AC waveform has a DC component, the average voltage would be equal to the DC voltage instead". But in my text book, ...