Questions tagged [signal-processing]

the analysis, interpretation and manipulation of signals

Filter by
Sorted by
Tagged with
0
votes
0answers
26 views

partially periodic function and fourier series representation

I am thinking about this for a while but I could not reach a conclusion. If I have a periodic signal let's say a square wave but it is only non-zero for t<100 and t>-100. the function is ...
0
votes
0answers
19 views

Probability and Stochastic Processes for Engineers Helstrom Solution Manual [closed]

Does anyone know if there was ever a solution manual published for Probability and Stochastic Processes for Engineers by Carl W. Helstrom ISBN 0-02-353560-1. thanks
0
votes
1answer
46 views

What are the different types of digital signals

In a digital logic class I was taught that a digital signal is one whose y-component, voltage, is discretized but whose time domain is continuous. In a signal processing class, we worked with digital ...
1
vote
1answer
54 views

How to ensure signals from multiple different clocks are in phase?

I am designing a pcb where I have a signal of 10 MHz logic signal with 50% duty cycle that might be coming from different clocks. I will be using a pll frequency synthesizer to turn this into a 50% ...
0
votes
1answer
53 views

Why X0 equals zero?

The question is as shown below: The answer is as shown below: Everything is clear except based on what did he assume that X0 = 0? Below are the reference for formulas Below is my trial:
0
votes
1answer
63 views

What is the stability of a digital signal processed by a filter with z-transform?

I have a question from the book FE Electrical and Computer Review Manual by Michael R. Lindeburg page# DE X-1 with its answer as follows: I tried to solve it as follows: I don't understand why is it ...
0
votes
1answer
33 views

Connecting Geiger Counters in Coincidence

So for this Geiger Counter kit from mightohm (https://mightyohm.com/blog/products/geiger-counter/), does any one have any suggestions for what circuits to build to connect two detectors in coincidence?...
-2
votes
1answer
50 views

How does signal aggregation work? [closed]

I just wanna know how signal aggregation works. For example, there is an IC which can aggregate more than two interfaces(I2C, SPI .etc). Thanks.
0
votes
0answers
26 views

Advice on Noise in Square Input Signal

I am reading the following signal from an open drain output, and trying to read the signal frequency. However, I am getting short spikes in the wave as seen below, and this is messing with the reading ...
0
votes
1answer
50 views

Phase-shift a Broadband Time-Domain Function

Suppose we have an operator \$A_\phi\$ which phase-shifts a sinusoid by \$\phi\$: $$A_\phi[\cos(\omega t)] = \cos(\omega t + \phi)$$ In phasor domain, \$A_\phi = e^{+j\phi}\$ is a complex constant. I ...
1
vote
1answer
45 views

Total noise in an amplifier with multiple noise sources

I have some doubts about how to evaluate the total noise in a circuit. The noise evaluation theory is well explained on the web, there are not specific practical examples similar to that I need. I'll ...
0
votes
1answer
67 views

Selecting a low cost, compact controller/processor for a custom sensor device [closed]

I'm a phd student in aeronautical engineering, and I'm designing a custom sensor device for my research. I've figured out the initial stage of the device, which involves converting the analog signal ...
0
votes
0answers
16 views

Parseval Theorem and RMS

I was just thinking that when we have $$ \overline{|v(t)|^2}=\frac{1}{2t}\int_{-t}^{t}|v(\tau)|^2 d\tau $$ we couldn't apply Parseval theorem, for it is normalized. For applying Parseval Theorem, we ...
3
votes
1answer
47 views

THD calculated with amplitude instead of RMS

I have a digitized sinewave, and want to determine the THD of this waveform. This is the equation I am familiar with for calculating THD: $$ THD=\frac{\sqrt{\sum_{n=2}^{\infty}V_{n_{rms}}^2}}{V_{fund_{...
0
votes
0answers
16 views

Why use both packet detection and symbol time estimation in the receiver of WLAN(WIFI) in 802.11

n IEEE 802.11 Wlan, at the receiver side, we first use packets detection algorithm to detect the start of the packets, and then uses fine symbol timing estimation algorithm to find the start of the ...
0
votes
2answers
37 views

How to get USB-mouse output from capacitive touch panel?

I have this 7" capacitive touch panel overlay that I want to attach to my Raspberry Pi 4B. I don't know what kind of data comes out of that FPC cable, or even what its pinout is. Is there a well-...
1
vote
2answers
92 views

Small signal digram

According to this figure how to get qeuation(7)and(8)
0
votes
1answer
66 views

Noise as a source of information?

I was studying a book on signals and systems where it says that noise disturbances which interfere with the transmitted signals are a source of information. And the original signals are not. It ...
0
votes
3answers
70 views

How to overdrive a signal?

I am planning to build this circuit below as a electric guitar amplifier. Source And I also would like to add gain control overdrive channel to existing design. I have simulated this circuit on ...
0
votes
0answers
36 views

how to apply frequency-dependent attenuation to a signal

Let's suppose a signal like this: the frequency domain plot of such a signal is: Now, What I intend to do is to apply a frequency-dependent correction to the signal. For example, the attenuation ...
-1
votes
2answers
85 views

the idea behind signal processing [closed]

Is how we detect signals that we start the transceiver in a sampling period at a certain frequency and we take the convolution of it and all incoming signals during that period? When we transform we ...
-1
votes
1answer
56 views

why should I use NYQ(Nyquist Frequency) to get the propoer value of the cutting frequency in high or low pass filter? [closed]

I am working on signal processing using filters (basic,IIR,FIR) but I didn't quite got the intuition behind the next operation when I am performing a high pass filter with the cut frequency defined as ...
0
votes
1answer
29 views

About discrete time model for wireless channel

I am trying to understand Section 2.2.3 of the book "Fundementals of wireless communication" by Tse and Viswanath. In this section the authors explain how to go from the continuous time ...
1
vote
1answer
84 views

Using FFT to calculate derivatives of polynomial

I know that there are several posts about FFT and derivatives, but I don't get it. I also tried in mathematics but no answer. The formula is: $$ f(t)→\hat{f}(ξ),f′(t)→2πiξ\hat{f}(ξ) $$ First, I don't ...
0
votes
2answers
49 views

Complex signals is the same as natural signal [closed]

I am working using a sinuasidal signal along with the complex signal derived form it and when I plot the signals spectrum using FFT I got the same spectrum and it turns out that the signals are the ...
1
vote
0answers
33 views

DTV Data from IEEE 802.22 Meeting in May 2006

I am currently working on some signal sensing algorithms. In various papers I have come across the reference to DTV signal data that they used for their simulations, amongst others: Reference number ...
6
votes
5answers
1k views

Does “a signal is buried in noise” mean that the noise amplitude is still smaller than the signal amplitude? (Special case: Lock-in amplification)

I heard that Lock-in amplifiers (LIAs) especially play to their strengths when the signals are weak compared to the noise level. But then I talked with someone about it, who understands the principles ...
0
votes
0answers
25 views

Lock-in sensitivity and output signal

I am measuring a signal with a lock-in amplifier (SR830) and sending this signal through a GPIB connection to a LabView VI. Should there be a coefficient on the voltage I receive in my VI to read the ...
1
vote
1answer
54 views

Fourier Transform Time Scaling Property using f (frequency) or w (omega - angular frequency)

The time scaling property for a fourier transform is as follows: My book shows this property in terms of \$f\$; however, my instructor likes to use \$\omega\$. I have also seen this property written ...
0
votes
1answer
69 views

Using Window Function to calculate RMS

The code below is from this site: https://community.cypress.com/thread/51426 I'm trying to understand what is happening in that code. Do I really need double type variables? This code is implemented ...
3
votes
1answer
72 views

How to modify zeros and poles in a delta-sigma modulator loop?

In this specific case, I am modelling a delta-sigma analog-to-digital converter with a basic loop in which the output V is fed back with unity gain to be subtracted from the previously sampled input U ...
0
votes
0answers
25 views

SIMULINK :Frequency Multiplier

I'm working on implementing Armstrong Modulator . I successfully implement the narrow band block but I'm struggling into finding a solution to multiply the frequency of my modulated signal . Any ideas ...
4
votes
1answer
131 views

FFT of time-compressed signal not outputting correct amplitude spectrum

Given a signal g(t) <--> G(f), a time-compression g(at) <--> 1/(abs(a)) * G(f/abs(a)), but not with the FFT as I've found out. Performing the FFT on g(a*t) doesn't scale the amplitude of ...
3
votes
1answer
33 views

ENOB and oversampling ratios for delta-sigma ADCs (in relation to CS5343)

I came across the CS5343 ADC the other day and was impressed with its specs (relative to its cost) but then became confused when I dug deeper and read the datasheet. It's nominally a 24-bit 96 kHz ADC,...
1
vote
2answers
77 views

Which is more efficient: every loop or afterwards?

Planning to collect some sensor data with an Arduino (or ESP32) and looking through other people's code I noticed two variants, generally, to process sensor data. Collect, average and subtract some ...
0
votes
0answers
35 views

Calculate bandwidth of wide-band FM from spectrum graph

I want to calculate the bandwidth of my signal output from the graph it results from application of the FFT. I can apply the Carlson formula knowing that I have all the parameters :$$B = 2(\beta +1 ...
3
votes
2answers
191 views

Does the bandwidth of an NBFM modulation change depending with the modulation index?

Hello electrical community ! I'm learning about FM Modulation ,especially with narrow Band FM.And I was wondering if the index of modulation BETA affect the bandwidth of the modulated signal. In fact ...
3
votes
1answer
41 views

SIMULINK: The spectrum of the modulated signal remains unchanged despite modification of the modulation index

I try to implement a frequency modulator. From what I know, the more I vary the modulation index (which is set by the gain block here,) the more the spectral lines should increase in number. When I ...
0
votes
1answer
52 views

Can LTSpice waveforms be exported for further processing?

The following LTSpice temporal domain output is taken from https://electronics.stackexchange.com/a/55256/56469. Thanks @Oli. Is it possible to acquire the underlying data that generated V(noise+sig) ...
0
votes
1answer
30 views

Processing the signals generated by the sensor at the expense of sensitivity / selectivity

I'm having trouble finding study material or subject. Theme: Emphasize the processing of signals generated by the sensor at the expense of sensitivity / selectivity. I can find material related to ...
0
votes
0answers
40 views

Find the 4 pins for i2c on printer consumables' chip - konica minolta

I just saw this video https://www.youtube.com/watch?v=Wwd5UCi9Huw about forcing an OEM (= original) printer consumable chip to reset its lifespan counter. However the chip on that vid has 4 ...
-1
votes
1answer
91 views

WIFI over wires [closed]

So, guys I have made wifi gun a but it seems not working as there are a lot of trees between my friend's wifi and my home ( 1km distance ), So is there a method to convert wifi to wire and transmit ...
3
votes
2answers
80 views

Does the concept of damping apply to 1st order systems?

I'm just learning control systems. Today I learnt about 1st order and second order systems. I understood Damping, Critically damped, over-damped and under-damped systems. So a question arises in my ...
0
votes
0answers
23 views

Calculating the Running Corrleation of two signals in Matlab

I am currently using https://www.eecs.umich.edu/courses/eecs206/public/lab/ to advance my matlab skills. Sadly I am stuck at lab2 task 2. First, i cant run the pcode file to get the proper solution ...
5
votes
1answer
161 views

Why does medical ultrasound use pulses instead of chirps?

My background is in radar where it's quite common to use chirped excitation signals (i.e. pulse compression). I have noticed that this method seems to not be used in medical ultrasound. Why not?
1
vote
1answer
42 views

How to calculate the maximum voltage of square signal from Erms?

How do you calculate the maximum oltage from Erms when you have dc and ac component?
0
votes
0answers
52 views

Restoration of time-shifted audio file using matlab

The two stereo channels of audio file are time shifted. Which is the easy model to restore the file to the original? I have a partial solution something like: Loading file like, ...
0
votes
2answers
52 views

How to calculate noise voltage after amplification?

I'm simulating the thermal noise experienced by some instrument, outputted as a voltage vs time plot. To calculate the "power" of this noise, I'm using: P = 4kTB (k = Boltzmann's constant, T ...
3
votes
3answers
96 views

Location of input for negative feeback bandpass filter

I came across a reference design on a TI application imaged here: It is clear to me that there is a bandpass filter on the negative loopback branch of the amplier. However, from the few electronics ...
0
votes
1answer
47 views

How to calculate thermal noise contributed by an LNA?

I've written a thermal noise simulation for a piece of equipment which produces the oscilloscope trace one would expect to see coming out of the instrument. Now, I'd like to take into consideration ...

1
2 3 4 5
15