Signal Definition and 989 Threads

Homework Statement By using Fourier transform, I want to calculate power of signal. I confuse that f(x) in attached equation represents voltage or power. Is that possible when f(x) means power to use Fourier transform. Homework Equations The Attempt at a Solution

If a carrier signal is 1000 Hz, and my message signal has a bandwidth of 100 Hz. Is there any change in frequency of the modulated signal? Why is it said that the message signal is now operating between 1000hz +/- 100Hz? I thought the original message signal frequency remains unchanged...

I'm going into my sr. year in EE and I want to focus as much as I can on signal engineering for my technical electives(digital filter deisgn, digital signal processing, comm. systems, antenna theory etc.) and I was curious where a path in that field would take me if i decided to go to graduate...

Hello I'm working on project for "design & implementation of EMG data acquisition" for now I completed the design and connected the output of the system to arduino uno to read the emg signal in real time with MATLAB 2017b using arduino support package. the problem is that the signal looks as...

In my quest to build better AI, I've been researching a lot on how the human brain works. I understand the overall structure of the neuron and how it communicates with other neurons. The only thing I don't understand is how a neuron decides when to send out a signal/response to other neurons...

Homework Statement I am suppose to write a program that compares the FFT (Fast Fourier Transform Diagrams) of a sampled signal without the use of a window function and with it. The window function should be as long as the signal and the signal should have N points, N chosen as to not cause...

Hello, I have a very specific problem and didn't find any way to solve it. My signal is very slow changing at 5V +-100mV When I want to display this signal on my RIGOL Oscilloscope, the problem is, that with AC-mode I don't see those slow changes and in DC-mode the offset range is limited to...

Good day. Resently, I bought the Hamamatsu R928. But when I connect to power suply and connect output to the osciloscope I have strange signal. Maybe someone know the origin of this signal?

Hello, This problem is about a.c. I am used to simply using basic a.c. supply symbol in circuit diagrams. Here, I need to draw the set-up for an experiment where I can change the frequency of the supply (not the voltage) and see how this affect the peak current through a coil. how can i...

I need two synchronously flashing LEDS (as if they were connected together), but if possible I prefer to avoid connecting them with a wire. No problem with each one having its own battery and a driver. They will be about 2m apart without anything that could stop RF in between. I find it hard to...

Greetings. I have a system that is powered by 5V . You will see below in the image. The system displays the difference between the Hi and Lo signal digitally, on the display which the board is plugged into. However. I want to store the data maybe in a SD card? Using Arduino? How do I harness the...

What are the different signals we obtain from TEM and How can we distinguish between them? what are the significances of those signals?

i have a drawing of a circuit that converts a signal in range [-5,5] V to a range [0,1.2]V . i wish to understand how it works.. i have basic knowledge of electricity as an undergraduate in general physics but a bit rusty , thus i am here looking for answers...

Hello everyone! It seems to me that there are many ways of calculating SNR depending on the type of signal and the nature of problems. I was able to get a decent amount of information for electrical signals but couldn't find resources which discuss the topic in a more generalized manner. I was...

Greetings, In the first picture below, I create a 5 volts sine amplitude signal with a frequency of about 100 Hertz. The 3 Ohm, 400 turn coil (that will eventually be part of a transformer) is not initially connected. The output waveform from my function generator completely matches my input...

Hello everyone, I have a question regarding data reconstruction over RF, especially in the case of FM. Let us say I have a trivial case where I have a carrier frequency of fo and a bandwidth of fbw. I want to setup a scheme such that fo + fbw is a 1 and fo - fbw is a 0. (I'm naively under...

Hello! (Wave) We consider a long country road with $n$ houses placed along of it (we think of the road as a big line segment). We want to put antenna of wireless internet in some places of the road so that we cover with signal all the houses. Each antenna has a range of $k$ meters and can cover...

Dear sir. I want to test my valve amplifier, to do so I need a signal generator, I do not want to buy a kit I want a cheap ready made one , can any of you guys tell me where to buy such a thing? thanks.

I wasn't sure if I should post this here or academic guidance but given the career factor in this question I will post it here: I am doing a masters in electrical engineering with a focus on signal processing but I am also interested in others areas such as machine learning and robotics. I need...

We have a question we cannot understand… We are university students working on a pet project, we are trying to pick up an electrical current passing through a conductor via a capacitive sensor (i.e. attached to a charge amplifier with filters) that is not in direct contact with the circuit...

Homework Statement A radio transmitter is located 17.5 km away. The broadcast signals travel at the speed of light (c = 3.00 x 108 m.s-1) through the air towards a radio receiver. Calculate the time it takes the radio signal to travel from the transmitter to the receiver. Homework Equations...

Hi all, I performed a resonance experiment over the past two weeks, in which I collected the intensity of a Fabry-Perot cavity whilst adjusting the mirror distance with a piezo-element (the specific setup of the experiment is fairly detached from the question I will ask). My raw data is...

Hope, I do not violate any forum rules here, this is not a discussion topic, mostly. I am just asking for help looking for a specific article/work. I just remember reading somewhere that there is a QM theorem or article saying smth. in a sort that if the same physical "ontic" state would be...

http://www.seas.ucla.edu/dsplab/sqc/over.html It says we have to normalize a signal before it is fed to a compander which reduces its dynamic range. But why don't we directly feed the compander block without normalizing the function first? Help Required.

[Moderator's note: This discussion has been spun off from another thread since it was getting into a more technical area only tangentially related to the original thread's topic. Some posts have been edited slightly for the new context.] They're too technical for the question here, and only...

https://en.wikipedia.org/wiki/Discrete_Fourier_transform Why is the signal obtained from a DFT periodic? The time signal x[n] is finite and the number of sinusoids being correlated with it is finite, yet its said the frequency spectrum obtained after the DFT is periodic. I've also read the...

Hi there! i have a question regarding signal and hope someone can help me out. Currently, i have a system that outputs synchro signal to other system. Apparently when the cables are connected to the system, the frequency of the synchro signal changes. From around 400KHz, it became around 1.2KHz...

Homework Statement I am giving the following signal: and asked to get the DSB-SC signal of this Homework Equations 3. The Attempt at a Solution [/B] So, I know a few things. My prof writes that I would have to multiply my original signal out and then take the Fourier transforms...

I am looking for a signal processing textbook that uses real, complex, and functional analysis with measure theory. In other words, mathematically rigorous signal processing. Specifically, I prefer the kind that takes time to review all the topics from mathematical analysis before jumping into...

Hi, I am currently having an issue and hope someone can help me out! I have a Digital to Synchro card on my server that will transmit the synchro signal voltage to various component. For this issue in facing, System A takes in 4 sets of data. Thus, there will be 4 sets of S1 S2 S3. At System A...

Homework Statement Hi, So we started sampling/sampling theorem, dirac delta, DTFT in a digital signal processing module and I'm kinda confused. I understand how to derive the following formulae but these two formulae are so different to each other that I don't understand why? We are first...

Homework Statement Hi, I'm just trying to derive the small-signal model of the cascode MOSFET amplifier circuit. In the lectures, we were just given the small-signal model directly. I'm trying to derive it. I have almost the exact same thing except where I put the output voltage. In the...

I've been using DC motors with magnetic hall effect encoders on them to measure position control. It's basically a feedback servomotor system. i've so far been feeding the signal into my microcontroller's interrupts. This has been causing some problems with my timers and program. Let's say the...

I'm trying to measure high voltages with a DAQ card. Obviously I'm going to have to attenuate the voltage, but I need to make sure that I can measure accurately (within 1%) The code width of the DAQ is Vcw = 20Vpp/2^16 = 305.176uV For this code width to be within 1%, the minimum voltage I...

I'm currently working with the 1d DEEP2 DEIMOS fits files (see http://deep.ps.uci.edu/deep3/specprimer.html) and am trying to define some exclusion criteria in Python 2.7 for the data based on the noise. What's the best way to quantify the noise in order to do this? Thank you!

Like we write "R+jX" where jX is considered to be imaginary term and it said to have 90 degree phase shift.

Hi All, An observer, F, stands on Earth. A spaceship, F', is also on Earth. Their clocks are set at 0. The spaceship then leaves Earth at .5c. After 10 seconds, F sends a light signal to F'. As soon as F' receives the signal, F' sends a light signal back. When does F receive this signal from...

I'm starting a new job search where I'm interested in getting an entry level engineering position so I'm trying to figure out the industries where I would realistically be able to obtain a job as an engineer. I obtained my A.S in Engineering Science, my B.S in Physics, and my M.S in Biomedical...

Homework Statement So let's say that I have a signal of fundamental frequency 50Hz. I then have a band-pass filter that passes the band between 800 and 1000 Hz of my signal. I don't know the expression of the signals I just know the graphics: [![enter image description here][1]][1] [1]...

Hi, everyone. I'm working on a project right now where I need to amplify an AC signal to create as much current as possible in a solenoid to generate as strong a magnetic field as I can. I'm likely dealing with a maximum of 10 V and 10 mA from my signal generator, but I ideally need a peak...

Homework Statement Consider the Fourier series of a signal given by $$x(t)=\sum_{k=-\infty}^{\infty} a_ke^{jk\omega_0t}$$ Let's consider an approaches to this series given by the truncated series. $$x_N(t)=\sum_{k=-N}^{N} a_ke^{jk\omega_0t}$$ a- Show that if $x(t)$ is real then the series...

Hi, a very basic question: what is a good intuitive way to understand the importance of a reference prior? In the context of a signal search. Bellow, I also try to give the way I understand the approach in a Bayesian analysis (roughly): 1. You have your likelihood model L = p(x_{obs} | \lambda...

Hi all, I have just measured the pressure on a point of a tillage tool and the resulting signals is reported in the following link. In literature, tillage tool are modeled with a constant pressure, but i reality the pressure changes over time and I would like to model the pressure...

Hi, I am keen to know how the photoelectron counts (or count rate) is determined from the measured ARPES signal in the detectors used by ScientaOmicron Hemispherical electron energy analyzers? These detectors consist of Micrchannel Plates (MCP)- Phosphor screen (PS)- CCD Camera setup. The...

I'm completely new to transmitting/receiving signals, but I wanted to get a scope of what kind of components are out there that I could use to build this system. I wanted to read the voltage drop across a resistance thermometer (Vt) and send this signal wirelessly to another circuit, where I...

Homework Statement Homework EquationsThe Attempt at a Solution Now, the input circuit is also biased as the transistor to work in the active region and without the biasing of the input circuit , the input circuit may get reversed biased during the negative half cycle of the signal voltage...

I'm new to electronics, and using my new equiptment I would like to generate a sine signal on my function generator and display it on my oscilloscope. Equipment: * The scope is Rigol DS1054Z * Function generator is a $60 digital chinese. My problem is: When I plug connect the function...

Hello everyone. Iam about to read a course in DSP and I can't get my head why complex exponentials are used as input signals that often? Is it just to simplify the math? If not, what exactly is the imaginary part of a complex exponential? Does it "do" anything special compared to a real valued...

Hi,what does it mean by „cryptographic GPS signal“? P code of military GPS signal?Senmeis

Ok, so i have a picaxe microcontroller putting out a pwm signal to the gate of an irlb3034 "logic level" n-channel mosfet. The mosfet is for grounding on and off about 8v of 20 to 40 amps. When i take my circuit and jump 8v directly to the gate of my mosfet everything works perfectly...