# Questions tagged [fourier]

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

252 questions
Filter by
Sorted by
Tagged with
69 views

### What is the physical meaning of reactive power in non-sinusoidal steady-state (with harmonics)?

In sinusoidal steady-state (linear loads, no harmonics), I understand what is reactive power $Q = V_{\text{rms}} I_{\text{rms}} \sin{(\theta)}$ where $\theta = \theta_v - \theta_i$: its absolute ...
29 views

### Equation for square law circuit modulator

For DSBFC AM (double side band full carrier amplitude modulation ) the message signal m(t) must be multiplied by carrier maybe $$Ac*cos(\omega_c(t))$$ (For modulation) This modulation is done in ...
33 views

### Why is there a low pass filter in a DSBSC demodulator?

In analog communication, DSBSC (double side band suppressed carrier) is way of modulating signal. In this the carrier is simply multiplied with the message signal. At the demodulator, the carrier is ...
34 views

### Why do sampled signals repeat in the frequency domain?

I do understand it mathematically, that multiplying a signal with a Kronecker(T) is the same as convolving it with Kronecker(1/T) in the frequency domain, and that makes sense. But is there an ...
46 views

### If interharmonics are defined for periodic signals, aren't interharmonics misleading?

Before explaining my question, I'm going to assume that 1) interharmonics, just like harmonics, are sinusoids; and 2) to analytically represent the interharmonics of a signal, we sum them to the ...
35 views

### Absolute values of fourier transform of noise-charged RLC circuit

I am doing time-domain simulations of currents in a parallel RLC circuit charged by thermal noise. In detail in pseudo-code: ...
108 views

### When a signal has an interharmonic, is the signal periodic or non-periodic?

I have some questions regarding interharmonics. What I'm going to do is first ask just a few, and then as people answer them I would expand this post or create a new question. Harmonics are sinusoids ...
39 views

### How to isolate coefficiets from complex fourier series?

I have to find yn/xn ratio. From the circuit analysis i found out transfer function Uout//Uin = . I am having hard time trying to isolate two coefficients of two complex fourier Series. Any help is ...
34 views

### Validity of superposition when summing powers from each harmonic

In Boylestad's Introductory Circuit Analysis 13th edition page 1176, there's an example about working out the total power dissipated by a circuit fed a nonsinusoidal signal. The signal is decomposed ...
42 views

### Why do we use a wide-band amplification in order to reproduce a sharp pulse without distortion?

I was reading some content with regards to the Fourier Transform and the uncertainty principle. In the book I was reading that Due to the uncertainty principle, in electronics we use a wide-band ...
83 views

### Generation of triangular wave from passive networks

I wanted to generate a triangular wave from a pure sine wave using only passive networks (RLC circuit only.) I wanted to realize such a network and at first I thought maybe the Fourier transform (of ...
70 views

45 views

### Interpreting Fourier transform of Images

I'm new to image processing and am learning about the Fourier transform. I've read that FT decomposes a function to its constituent frequencies. However, I'm not sure how to tell which is a low ...
73 views

### Relationship between harmonic's amplitude and square wave's Tr and Pw

I started reading this TI guide on high speed layout guidelines and had some question on the theory of clock signals (pages 2 and 3). From the image below it's clear that the amplitude of the first ...
81 views