Signals Definition and 434 Threads

I'm a math major having taken 1st yr physics, programming, lab electronics, and a EE minor of 4-5 courses on signal processing and linear systems (including couple grad courses). I'm also doing medical imaging research w/ the EE dept this summer. I didn't major in EE b/c I've no interest in...

hi yea umm is there any research/thinking regarding carrier wave signals being transmited vocally? jb

I'm logging the RPM of a scaled wind turbine using a laser and modified microphone (with a photocell instead of a coil). The signal is recorded using Audacity and is a series of troughs separated by the time it takes for one blade to pass through the beam (please see attached image below)...

Homework Statement No problem statement - just the following questions. Homework Equations 1.Display on a CRT is most similar to what reconstruction filter? 2.How many samples are required to represent a given signal without loss of information? 3.What signals can be reconstructed...

Homework Statement Suppose rocket traveler Amelia has a clock made on Earth. She flies to and back from a planet 12 light-years away (as measured from rest with respect to Earth) from Earth at a speed of 0.6c. Every year she sends a signal to Earth. How many signals does Earth receive by...

Hello all. I have two functions in time f_1(t) and f_2(t) composed of the same set of frequencies such that, say, f_1(t) = \sum a_n \cos(\omega t + d_1(t)) and f_2(t) = \sum b_n cos(\omega t) and I would like to find out the value of the phase difference (I've set the phase in f_2 equal...

Hi all, I am enrolled in an introductory signals and systems course at my university. I don't like talking down on my professors but in this case I can't help it. He is one of the worst teachers I have had in my life. I have visited his office hours but he's not really helpful in there...

Homework Statement Questions We ¯rst model the vocal tract by a simple second-order di®erential equation: d2y(t)/dt2 + B1dy(t)/dt+ C1y(t) = A1x(t); where A1 = 3:8469 £ 106, B1 = 325:6907, and C1 = 3:8469 . We denote this system by H1. Here, t is in seconds. Step 1.) Use MATLAB to...

Hi all! I wanted to have a little clarification about this line in relation to Fourier Series: (It's about a periodic and symmetrical signal) "x(t) is a periodic signal. As cos nwt is an even function and sin nwt is an odd function. So, if x(t) is an even function of t, then x(t) cos nwt...

can we obtain electrical energy from sound signals?? hello everyone.. i want to know that is there ny method or any apparatus to convert the sound signals into electrical energy efficiently such that it will glow a led or can acticate a buzzer! well i know about sound detector circuits...

How "bright" are radio and other EM signals? Greetings, I am wondering how "bright" man made EM signals such as radio are. That is, if they were in the visible range, how would they compare to visible light sources? Would they be barely visible? Would they be daytime sky bright in every...

Could anyone help me to understand the working of a antenna? In antenna, we are using voltage or current as signal input and how this could be converted into em waves and vice verse in receiver side?

The Question I want to understand how a sound wave changes in the form of its signal into the brain. I don't know the terminologies. I don't know what this subject is called. If you know the right terms or know where I should look, please fill me in. My question is: What is the form of...

Hey Guys, I'm a mechanical engineer (please forgive my ignorance) with an electrical engineering problem. I'm trying to control a small DC motor with speed and duration controls using a remote cell phone. I might also like the ability to receive temperature data from the motor back at the...

I will make this my discussion thread. I have many questions to ask which I will post here. Please keep checking. All help will be appreciated. My first question is: For discrete signal, we use variable 'n' and for continuous signal, we use variable 't'. But is the convolution integral valid...

Homework Statement Regulations require that licensed radio stations have limits on their broadcast power so as to avoid interference with signals from distant stations. You are in charge of checking compliance with the law. At a distance of 25 km from a radio station that broadcasts from a...

I'm looking to create a radar in the public band (2.4GHz) to detect oncoming cars from a relatively short distance (around 9 meters). I have access to a signal generator which can generate the 2.4 GHz signal, as well as another generator to create a pulse train of around 3MHz. I also have all...

Is it possible to combine two AC signals that are slightly out of phase, but have the same frequency, voltage and current through an inductor, resistor series network.

The idea has been bounced around, and i thought to see if anyone here had any guidance before i tear into the literature. What kind of circuit is necessary to determine the frequency of an rf signal? The situation: An rf transmitter is pumping out waves (no modulation or data to be decoded)...

I've been working on this problem for around three hours, and I'm getting nowhere... I think it may be that I don't have even the most basic grasp of the material to even get a decent start on the problem, but hopefully someone here will be able to help me... Homework Statement Calculate...

Is there any other way to send signals a significant distance other than with EM radiation or (doubtfully) gravity? By signal I mean the complex information that we are able to send via radio or other EM transmission. I don't think there is any other way other than EM radiation but I cannot...

Can the aggregate brain waves from a stadium crowd register on a state-of-the-art EEG at midfield?

How do you "read" the flirting traffic signals women send men? Have you noticed that when you're around someone you feel attracted to, you feel different on the inside than you do when you're around someone you aren't attracted to? Well, apparently we send off subtle body language signals when...

Homework Statement Consider the block diagram below. Find the differential equation of the system. Homework Equations None, other than understanding how block diagrams work. The Attempt at a Solution My attempt is posted below, as an image. The reason I am having such trouble is...

This suddenly came up in a MRI class. I kinda understand IQ modulation (both amplitude and phase are modulated). But how does IQ demodulating a signal help, specially MRI signal. In case you don't know a MRI signal, its just a exponentially decaying sine.

The other day, I was sitting down watching TV, then I turned the TV off, and the DTV, and I noticed a sort of ringing high frequency humming in my brain. But the strange part was that when I turned my head 90 degrees, it stopped or got really quiet. Turned my had back to normal position sound...

what are the preprocessing steps to be performed on a speech signal in order to extract its fundamental frequency accurately? which sampling frequencies and cut off frequencies are to selected to get a better result?

Can a generic, not necessarily harmonic, signal of time be represented as a complex signal with a real and imaginary part? Usually the complex rappresentation is used for time harmonic signals and linear systems. The "real" time signal is transformed into a complex signal. At the end of the...

Could someone explain to me the meaning of the following concepts: 1. Filtering out AC: is used to reduce the ripple of a DC power supply. 2. Filtering out DC: Only time-varying signal will pass through a capacitor. The circuit on either side of the capacitor can be at different DC...

As stated in title: I have full knowledge of the 2 signals. They have the same Power Spectral Density. However, only certain components of the 2 signals have the same phase. Is there any way of extracting these components, or at least their PSD functions? Is this doable at all? The phase I...

Ok I've got an output from a mp3 player which has two channels (L & R) however the device I'm connecting it to can only output mono sound, so what I did was merely connect the left and right channel wires together but what I'm wondering is AC signals are not so clear cut to me, I'm currently...

I know that y(t) = t x(t) is unstable, for bounded inputs yielding unbounded outputs, but would y(t) = x(t)/ t also be unstable? when t is going in the negative direction? please help. test Monday.

I was wondering what kind of things you would need to transmit to a satellite or something on Mars and get video and whatever other signals back from there. Like transmit controls there for a rover to take and possibly to bring it back. So for the journey there and back.

I want to transmit digital signals over an existing electrical network. Can someone give me an idea of how to go about it?

I know what complex numbers are, but what actually is a complex signal as opposed to a real signal? I know a little Fourier Transform and in that context it is described as the difference between a cos wave and sin wave signals. But when I read about it in mobile communications it is described...

Need help! Digital signals. Energy and power Homework Statement ∞ ∑ (3)^2n n=0 FInd the energy of the signal Find the power of the signal The Attempt at a Solution Energy: (3)2n = 32+34+36+...=9+81+...= ∞ N Power: lim (1/(2N+1)) * ∑...

O.k., I'm not sure how to phrase this, but I'm going to try. If I'm confusing in my question, just ask for a clarification. I want to know how detecting the source (or direction) of an interstellar signal works? Specifically, a theoretical signal sent from an alien civilization at us. For...

Hi guys..how do u generate two identical voltage signals using the simplest BJT circuit?appreciate any help...

Why is it that very low frequency signals cannot be transmitted by antennas? (Or why is it inefficient?) Thanks!

Dear All: Any idea for the following interesting question: As we know we can calculate inner product of two wave functions A and B as <A|B>. here both A and B are vector in hilbert space. here we may use fourier transform to get momentum representation of A and B, and get same...

how does one calculate a gain in signal e.g sine wave. do we take peak-to-peak (or peak) of the output divided by peak-to-peak(or peak) of the input?

When someone gets hurt or infected, its usually very painful when the doctor works on that exposed area. The only reason why you feel the pain is because the nerve ending shoot electrical signals to your brain. Would it be possible to devise an electromagenetic collar that goes around the arm or...

Hello there, My project is a Smith Chart calculator/simulator that takes the Zo and ZL of a transmission line and calculates various data like SWR, SWR(dB), return loss, coeff I, E, P, etc. It also constructs and plots on a graphical Smith Chart. I want to take this one step further and...

Homework Statement a) Write a Matlab function, which accepts the following inputs -a finite set of Fourier series coefficients -the fundamental period T of the signal to be reconstructed -a vector t representing the times for which the signal will be reconstructed Homework...

I ran a time-domain simulation in HSPICE & I am trying to analyze the frequency content of the transient current draw...(FYI- I have the power systems "impedance vs. frequency" curve, and my aim is to determine the noise voltage on my power rail given its impedance now) So I run FFT...

Would there be paradoxes arise if information could pass instantaneously? If there where no limit how fast things can move. I know that in SR when faster then light travel is allowed, the casual order differ for different observers. Are there paradoxes in the classical Galilean space-time...

Is it possible to separate a specific frequency signal from a wide range of signals from a decoder/demux. For an example if you had a frequency range from 1 hertz to 100 KHz, is it possible to separate a signal of let's say 60Hz from the other signals.

Hihi, I don't understand what is the meaning that BNC cable transfer high frequency signal? For example, I use BNC cable for the connection between my diode controller to the diode laser. I also use BNC cable to connect my photodiode to the oscilloscope. I'm not sure what is the...

I was wondering, If we had a system in which we limited the stray capacitance by shortening the cable (standard co-ax) to about 1 foot, and we put a REALLY fast signal down there, say of the order of fs. Would we see a sharp spike which was of the order of the RC time constant (capacitance...

Group, I am a novice on learning Signals and Systems on my own . Got hold of Schaum Series on Signals and Systems after reading its reviews. I got confused in the "response of a LTC(Continuous-time LTI system) to an arbitrary input" Can somebody give me an idea about this? Also...