# Questions tagged [fourier]

Anything related to Fourier series, Fourier transform and similar mathematical tools used to analyze the frequency content of a signal.

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### Confusions regarding Laplace transform

We know that Laplace transform has two parts, $\sigma$ and $j\omega$. $\sigma$ is the real part while $j\omega$ is the imaginary part. Is it okay to say that the term $\sigma$ is a ...
• 41
128 views

### Mathematical difference between FFT and STFT

Can a FFT be recreated by performing STFT on the smaller time intervals and then summing them up. My doubt is that FFT is a usually a amplitude vs frequency data and STFT has a x-axis in units of time....
49 views

### Transfer function of two frequency spectra

When you have two amplitude frequency spectra (fourier spectrum), in this case of a torque ripple, how do you define the transfer function (or the ratio) between both? How do you "divide" ...
310 views

### How does this modulation cause sidebands?

The following figure is an excerpt from this paper: Input Differential-Mode EMI of CRM BoostPFC Converter by Fei Yang. Q#1 (first highlighted sentence): How does the modulation line frequency cause ...
• 669
80 views

### A half-wave rectified sinusoidal waveform has a peak voltage of 10V. What are its average value and the peak value of the fundamental component?

I know to to find average value: 10/pi What does "peak value of fundamental component" mean?
1 vote
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### Signal Dimensions in Simulink

I'm using R2022a, in Simulink I can not find the Display tab to access Signals & Ports>Signal Dimensions. Could someone point me in the right direction please?. Also, in the figure below the ...
• 173
1 vote
54 views

### Downconversion Intermodulation Frequencies - Where do they come from?

I recently came across this video which discusses the downconversion of a signal (referred to as IN) to an Intermediate Frequency (IF) using a Local Oscillator (LO). I'm assuming that all of these ...
• 41
1 vote
105 views

### Confused about the similarities between Fourier Series and Fourier Transform

My understanding of Fourier Series was, it is a method that decomposes a periodic signal into sum of signal given by infinite number of sines and cosines. And in case of Fourier Transform it was, that ...
66 views

### Why does a cosine function have a non-infinite Fourier coefficient?

I took my signals class a long time ago and have gotten used to using Fourier tables for a lot of things. I'm reading a textbook on communications and I stared at the Fourier transform equation for a ...
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