Questions tagged [signal-processing]

the analysis, interpretation and manipulation of signals

Filter by
Sorted by
Tagged with
-3
votes
0answers
47 views
0
votes
1answer
81 views

Need help for the signals question

Assuming that the signal x(t) is an energy-type signal and its energy is Ex= 2, what is the energy of signal -2x (t - 1)? My step was to find the x(t) graph, the amplitude would be 2 due to the energy ...
5
votes
5answers
879 views

Half wave rectifier query

This is an ASK asynchronous demodulator In the circuit, we can see 3 differentiated parts: One half-wave rectifier, one envelop detector and a comparator. The circuit receives SIG which is a ASK ...
-3
votes
2answers
108 views

Can we say that this system has a memory? [closed]

This unit step response has a memory because of (n+1) but can we say that whole system is not memoryless? If we can, why?
1
vote
1answer
62 views

Nyquist's theorem misunderstanding

I have been assigned the following question: From what I understood of Nyquist's theorem for a signal that contains power over a range of frequencies that does not include 0 Hz i.e. over a known ...
-1
votes
1answer
111 views

Thévenin equivalent: is this resistor useless?

I am doing a lab project that includes a sensor connected to a signal conditioning module. I am analyzing the circuit to understand more about how it works and I came across this: That voltage source ...
3
votes
1answer
66 views

Understanding Euler's formula in different forms

I am a little confused on the form of Euler's formula. I'm taking a signal and signals class where the book uses Euler's formula as: $$e^{j\theta} = cos\theta +jsin\theta$$ $$e^{-j\theta}=cos\theta -...
0
votes
1answer
53 views

Using the autocorrelation of a signal \$f(t)\$ to identify its (longest) period?

Brad Osgood's book on Fourier Transforms defines the autocorrelation of a real signal \$f\$ of period \$T\$ with itself to be $$(f \star f)(x) = \int_0^T f(y)f(y+x)\ dy$$ We can show that \$(f \star f)...
0
votes
0answers
97 views

Why would an ADC produce square wave data from a sine wave signal?

I have a device that produces a 200Hz analog sine wave signal and reads the data in a time delay from the peak of the signal after X microseconds. When using an ADS1015 ADC to read the data at 100us ...
0
votes
0answers
47 views

How do you generate an impulse signal in a mechatronic system?

Background: I have a piezoelectric force transducer that I am using to measure the force produced by a combustion reaction in a tube. The issue is that there is a lot of ringing that occurs during the ...
0
votes
3answers
76 views

How does the author get to his equation for the ellipse and the antenna's beam?

I am trying to understand how the author of this textbook (Basic Radar Analysis by Mervin C. Budge) realizes the equation for the ellipse shown in the image attached labeled Figure 2.3 (found in ...
2
votes
1answer
81 views

How can we determine if a system is time invariant or not?

I am trying to figure out if the system in the diagram (part a) is time knvariant or not. When the input is shifted the output is shifted as well, so I am thinking the system is time invariant, but I ...
0
votes
0answers
33 views

Why do we have two separate transforms for transforming a time domain signal to the frequency domain? [duplicate]

I know that Laplace transform and Fourier transform are not exactly equal; they will be equal when alpha = jω. But according to my understanding, both transforms convert a time domain signal to the ...
1
vote
2answers
78 views

Optocoupler circuit to shift from 3.3V to 15V

I am trying to use the circuit below to shift a squared wave form (2kHz) with a peak of 3.3VDC to one with a peak at 15VDC. I am trying to do that with the circuit below, I am using the optocoupler ...
0
votes
1answer
116 views

How to turn a short voltage pulse into a long voltage pulse or increase bandpass

First I am not an electrical engineer, but I am on a mission, so please forgive my lack of resources and ability to explain my concepts. I am designing a device for people with blindness. Currently it ...
0
votes
2answers
68 views

Change range of a DC signal without changing the offset with op amps

I have a voltage signal with the following range: low - 2.5VDC middle point - 2.725VDC high - 2.95VDC I would like to condition this signal to: low - 0.4VDC middle point - 1.65VDC high - 2.9VDC I have ...
0
votes
4answers
117 views

Approximating a transfer function

Given the following transfer function: $$H(s) = \frac{20ks + 1200k}{s^3 + 98s^2 + (20k - 191)s +900 + 1200k}$$ I'm asked to reduce this transfer function to a regular second order transfer function as ...
0
votes
1answer
27 views

Calculating error of estimation of signal from noisy data (Explanation of result)

Given random varaible X with distribution $$ \begin{cases} \mathbb{P}\left(X=1\right)=\alpha\\ \mathbb{P}\left(X=-1\right)=1-\alpha \end{cases} $$ Where \$ \alpha \$ is a given parameter(\$X\$ is a ...
0
votes
2answers
92 views

How come two DFF can avoid metastability? [duplicate]

In my signal processing class, my professor said using TWO flip flop can avoid metastability. But he didn't explain it well. I wonder if anyone could enlighten me here? Thanks in advance!
0
votes
5answers
164 views

Huge difference between oscilloscope and multimeter

I am quite novice in electronics, but I have a great interest. I am analyzing an analog signal coming as input to a speaker. The purpose is to introduce that signal (after its corresponding leveling) ...
27
votes
4answers
2k views

How much data could be stored on a standard compact cassette using modern encoding?

My father and I recently dug out his old Commodore 64 from his basement and tried to revive it. Among other accessories, we also found his old Datasette drive, which is essentially a normal tape drive ...
0
votes
0answers
32 views

Trying to prove a property for the region of convergence of a Laplace transform

I've been studying Schaum's outlines for Signals and Systems, and came across this: And I understood the part until $$ \int_{t_{1}}^{t_{2}} |x(t)|e^{-\sigma_{0}}e^{-(\sigma_{1}-\sigma_{0})t}\,dt $$ ...
0
votes
0answers
54 views

Sampling a continuous time signal in a DSP

We are tasked with sampling a continuous time signal in a DSP. Before sampling, the signal goes through an analog filter of which I know the continuous frequency function H(ω). I also know the Fourier ...
0
votes
1answer
85 views

phase of Fourier transform when arrives at \$ \pi \$

I'm trying to calculate Phase of "rect" which is like below \begin{equation} f(x)=\begin{cases} 1 & \text{if }256<x<768,\\ 0 & \text{otherwise}. \end{cases} \end{...
-1
votes
1answer
36 views

Generate Chirp Signal using Arduino & Si5351

I allow myself to join you to know if it would be possible to have additional information concerning the Si5351 module. My need would be to use this module to emit a pseudo-periodic signal (aka chirp) ...
0
votes
0answers
42 views

Linearity and how it affects the response of a system

I've been reading Schaum's outlines for Signals and Systems, and stumbled across the beginning of impulse responses. However, I saw this: Which I understood as the impulse response being "what ...
0
votes
2answers
90 views

Is it possible to create a device that can decode the EM waves generated from an electronic machine?

I recently watched a movie in which the hero (a robber) invents a device that can capture and decode the EM waves generated from an Automated Teller Machine (ATM) during its use. The movie claims that ...
3
votes
3answers
118 views

Downsampling an audio signal, removing outlier values due to transistional spikes in the signal

I have an audio signal as following: I'm looking for a way to extract only the constant parts (in red,) or in other words, remove the outliers (in green.) I have very little knowledge in signal ...
0
votes
1answer
47 views

Causality on an accumulator system

Can anybody explain why is this system not causal. $$T[x[n]] = \sum_{k=n_0}^{n} x[k]]$$ How does it depend from future inputs when $$n < n_0$$. From what i've searched if \$n_0\$ was \$-\infty\$ it ...
0
votes
3answers
81 views

Lowpass filter (LPF) for ADC with cutoff frequency much lower than fs/2?

I was reading the datasheet from the ADS868x ADCs and it seems that in its internal circuit schematic it uses a 2nd Order LPF before the ADC driver, as the picture shows. According to the datasheet, ...
1
vote
0answers
38 views

Frequency domain analysis when sampling a switched (gated) integrator

I would like to use AC analysis (e.g. in spice) on a non-ideal op-amp integrator where the reset switch is open, and then apply a shaping function to the result of the AC simulation (in the frequency ...
0
votes
1answer
81 views

Signal to Noise Ratio Vs Signal to Distortion Ratio

I am a bit new to this field and I was reviewing some speech enhancement papers. These two terms keep popping up every once in a while so I was very confused as to what the difference between these ...
0
votes
0answers
37 views

Autocorrelation function of discrete time sequence

Say you have 2 discrete information sources each one being represented by a Gaussian random variable. This is the idea. Say I want to find the correlation of the 2 to know whether they are stationary....
1
vote
0answers
22 views

How to find priori information in Cramer Rao Lower Bound when the pdf of the parameter is unkown

In order to compute a Bayesian Cramer Rao Lower bound, we need to find the prior information of a random parameter "theta" which is a complex scalar parameter. The pdf of "theta" ...
1
vote
1answer
129 views

Estimating shot noise - what's the origin?

If I have some photon detector, say a CCD, how do I estimate the error introduced by shot noise correctly? Typically, sources found on the internet say that the shot noise is the square root of the ...
0
votes
2answers
79 views

Is there an analog method to compress the fequency range of an audio signal?

What I'd like to do is create headphones that record external audio with a wide frequency range, and remap that range into a range that's human audible. The only way I can think to do this is to do a ...
0
votes
1answer
47 views

What is 'mis-registration' and 'mis-collimation' of television signals?

I was reading about early televisions and television cameras, and I came across these terms with no explanation.... They appear on Google on a few pages, but again I cannot find a definition....
0
votes
0answers
41 views

FMCW radar sensor for vital sign signal processing

In order to get started with radar signal processing in MATLAB, I want to capture the heart frequency and respiration of a person with a FMCW radar. I only want to do post signal processing in MATLAB, ...
0
votes
5answers
100 views

Discrete time signal with continuous output = analog system?

This was a bit of a topic of debate in my class today. "A system measures the speed of the wind and provides voltage values proportional to the speed of the wind every 2 seconds." Is this ...
0
votes
1answer
35 views

AX5043 RF XCVR, problem making the automatic frequency control work in GMSK

I am working with the AX5043 RF transceiver from OnSemi. I am using GMSK, and I am unable to make the automatic frequency control (AFC) work properly. I am using a bitrate of 2400 bps. To be sure to ...
0
votes
1answer
52 views

Minimum sampling duration of beats

Let's take the signal to be sampled to be made up of several sine waves close to one another in frequency, e.g. 1MHz, 1.001MHz, 1.002MHz,... 1.005MHz I assume in the time domain we would see beats 1ms ...
0
votes
1answer
35 views

Minimum Detectable Signal of Camera and Improvements to Minimum Detectable Signal through pulsing

My goal is to determine for specific signal measSig, what is the largest background signal backSig I could receive and still be able to detect my measurement Signal? I know that camera modules ...
1
vote
2answers
609 views

Help discovering communication protocol used on faulty LCD matrix display

I own a device that has faulty 256 x 64 dot matrix display (flat cable damage + some bug infestation). After a disassembly I discovered that display is connected via 20-pin connect (soldered pins). I ...
0
votes
1answer
66 views

Fourier Series - Double Check Work

I was solving this Fourier series problem from my book, but was not able to find a solution to it to double-check my work. This is the problem: My work: \$T=4+2=6 sec\$ \$C_{n}=(\frac{1}{T})(\int_{t_{...
2
votes
5answers
2k views

Does the DC component of any signal also carry information?

Every signal carries some types of information in it. Mathematically we Know from Fourier series that these signals can be represented as a sum of its DC component and all the harmonics of fundamental ...
0
votes
0answers
47 views

Uniform circular array (UCA) beamforming using FFT

As far as I know, conventional beamforming using FFT can return a range-angle map. However, this only works with a uniform linear array (ULA). I'm wondering if the same approach works for UCA. I guess ...
0
votes
0answers
35 views

What can we conclude about 2 discrete signal which agrees on one period

Let \$x[n]\$ be a discrete signal. Now let \$ \tilde{x}[n] \$ be a periodic discrete signal, which agrees with \$x[n]\$ only on one period. The period of \$\tilde{x}[n]\$ is \$5\$ and according to ...
0
votes
1answer
54 views

Identifying transfer function by its approximated graph

Consider the transfer function which is approximated graph is: I want to identify this function. As far as I can tell, since we see decreasing by \$-20db/dec \$ at \$10^{-1}\$, we can conclude that ...
13
votes
1answer
1k views

How do receivers decode multiple GPS signals on the same carrier frequency?

I'm currently researching GPS signals and am trying to fully understand the path of a signal from satellite to receiver. I understand that mixed into the GPS signal is a C/A code as well as a PRN ...
1
vote
0answers
38 views

What can I conclude about the ROC of a transfer function in discrete time

I have a discrete system with transfer function $$ H\left(z\right)=\frac{a_{2}b_{2}z^{-2}+\left(b_{2}a_{1}+b_{1}\right)z^{-1}+\left(b_{0}+b_{2}\right)}{a_{2}z^{-2}+a_{1}z^{-1}+1} $$ Where \$ a_1,a_2,...

1
2 3 4 5
17