Signal Definition and 990 Threads

Homework Statement For my physics project I decided to make a Faraday cage to cancel out cell phone signal. Homework Equations The Attempt at a Solution For my first attempts at making a successful project I used chicken wire and wire mesh to make a cylindrical cage. Our goal was...

Right now I am working with: PMT: Hamamatsu R928/0115/0381 PMT Power Supply: McPherson PMT Power Supply Model # 7640 O-Scope: Tektronix TDS 5104 Oscilloscope PMT Housing: PhotoCool Housing PMT Housing Power Supply: PhotoCool Power Supply Input: 200 mW 532 nm ND:YAG laser I have...

Hello everybody. I'm trying to build a sound direction localising subsystem for a robot. I have two microphones placed a distance apart. I'm not worried about sounds behind or the distance, just the direction. I see two choices. Phase shift detection or a neural sim of interaural time...

I'm pretty new in MATLAB, and I can't seem to get it to display a signal. I have the following: t=1:1:100; s= 2*sin(2*pi*.05*t)*5*sin(2*pi*2*t)+.75*randn; plot(t,s) But i keeps giving me the following error: ? Error using ==> mtimes Inner matrix dimensions must agree. Error in...

I've got a signal and I would like to find the 3 dB bandwidth. The signal has a center frequency of f_{c} and a has a bandwidth shaping filter applied to it (ie, a root raised cosine filter). The problem with finding the bandwidth, is that I have no equation for representing a PSK signal...

Hi. I am study in electronic engineering. I want to learn about signal & system. Please introduce to me books in signal & system field. thanks alot. bye

In the interest of science you give your roommate a flashing light signal beacon and toss him/her into a supermassive galactic black hole. Describe what you see as you observe the fall from far away, stationary relative to the black hole. Explain your reasoning in each of the following...

I have two overlapping Gaussian distributions. One for probability of a noise event, one for probability of a signal event. My noise distribution has mean = 0, variance = 1, and standard deviation = 1. My signal distribution has mean = .80, variance = 3, and standard deviation = √3. My...

Hi, I'm new to the forum, as well as DSP. I am currently doing a project which involves filtering a square wave signal with a heavily skewed duty cycle which is going to have all sorts of noise imparted onto it. The basics of the project are such that this square wave is to be propogated...

I have a data acquisition device that outputs 3 volts if the sensor is activated. My relay only activates when a 5 volt source is put across the coil. What is the easiest way to step up the 3 volt control signal.

Hello all. I am working on a problem for class that is taking some time data and changing it to frequency data. I am using excel and the fast Fourier transform(fft). I am having a problem graphing the results. I am very new to signal processing. I am only given the data which is 1024...

This is probably a complete noob question, but due to my general lack of experience in this area I wasn't able to find the answer on my own. When you want to reroute a signal on the PCB to an external location, or replace a signal with one of your own, what situations do you need to cut the...

A causal LTI filter has the frequency response H(jw) shown in the graph. For each of these input signals, determine the filtered output signal y(t). 1) x(t)=exp(jt) 2) x(t)=(sin(wt))u(t) 3) X(jw)= 1 / ((jw)(6+jw)) 4) X(jw)= 1 / (2+jw) I don't understand what I have to do to find...

I have been trying to study special relativity by looking through various websites and internet resources. Here and there I saw some vague references to the fact that there should be a distinction made by the student between signal latency and actual relativity. I had always assumed that signal...

Hello everyone, this is my first thread :) It all started from the perfectly rigid rod connected from Earth to the moon and how fast the signal would get there if I pushed it. I understand the signal can't get there instantaneously because the inner structure of the atoms of the rod has a...

Hi, I have a sine-wave that has an AC component (that's very small -- mV range) and a DC offset (few volts). Can someone point me in the right direction as far as amplifying only the AC component? Also, does anyone know an alternative to PSpice Student... I get max'd out at 64 nodes, so I...

[SOLVED] Significance of Average value of a AC signal Hello, I would like to know the significance of average value in a AC circuit. Let's consider a sinusoidal ac source with only a resistor in the circuit. The rms value of voltage and current indicate the equivalent DC value which would...

Hi, I'm looking for an efficient algorithm to solve this kind of equation : S = (1-\nabla^2)B where both S(x,y) and B(x,y) can both be non-periodic functions. We know S and want to find out what is B. I was wondering if there was a 'well known' method to solve this kind or problem in the...

Homework Statement Generate ideas for adding two signals together. Homework Equations The Attempt at a Solution One way I've thought is to use a summing amplifier op amp circuit config to generate the sum of the signals. Are there any other configurations that will do this?

digital and quantized signal, are one same thing?

In question 1b of the midterm in the pdf attached below, I don't understand why the solution should be what it stated in the other pdf attached rather than what I did in the picture, which basically flips 1a along y-axis.

For the question (problem 2.39a) stated in the picture attached to this message, I don't understand why integrators should be used in favour of differentiator for the block diagram representing the differential equation system. Is this b/c of the nature of the differentiator electronics too...

In engineering we're always taught block diagrams in communication systems, specifically multiplying two signals... How exactly do you multiply 2 separate signals electronically? What does the circuit diagram look like?

What is Vrms value. How can i measure it practically with whatever instruments (read voltmeter, oscilloscope). is it some mathematical stuff or we can measure it directly as voltage is measured. so please tell me the difference between rms value and ac value of a...

Inverting a 130 Vrms, 40-45 kHz Signal?? Hello everyone, I was wondering if anyone might be willing to help me out on a little problem I am having: I have an amplifier output of 130*sin(f*t), f = [40 - 45 kHz], and I need to run this into two parallel lines such that initially, line 1...

Hello! Can someone explain why a signal with a higher frequency carries more data that one with lower frequency, namely in WiFi comunications? Thanks in advance.

Homework Statement If a(t) is periodic and is composition of two signals such that a(t) = b(t) + c(t), then are b(t) and c(t) necessarily periodic? 2. The attempt at a solution I think that b(t) and c(t) must be! Is this correct?

I have three courses that I can choose from: Electromagnetics or Digital Signal Processing II or Semiconductor Physics and Theory for my spring? Which do you suggest?

Homework Statement We will make a Spin-Echo experiment, and we know \rho_{w}, T1_{w},T2_{w}, \rho_{g},T1_{g},T2_{g}, where T1 and T2 are relaxation time,\rho is a proton density, and g mean gray matter, w mean white matter. We search TR and TE, TR is a repetition time, TE is an echo time. We...

Hi, I am pretty new to Matlab and am trying to reduce the noise of a particular signal. I found this pdf online and found it to be helpful. However, I am having trouble figuring out what the freq=(0:79)/(2*n*dt) means. More specifically the 0:79 bit. Any help would be much appreciated...

Sorry.. I know this is really simple.. I have 3 composite video signals, and switches to select between them. The switches I have are SPCO, so I can't just use another pole for the switch voltage. So, I need a way of detecting the video, and this switching on and LED. At first I...

Suppose I have 2 input signals V1 and V2, And I want my output signal to alternate from V1 to V2 and so on at a particular frequency. Any idea what components can help me to achieve this goal?? Thank you

Help. My @#$&!& Made in China %*@$*%# flatscreen has died, forcing me to go back to my vanilla Trinitron 15" monitor. The old monitor is giving me a "Signal out of range" error when Windows XP is about to finish loading (which is about when the monitor settings are kicking in). Sooo, I...

Hey i need help configuring a CD4059A cmos made by Texas Instruments to divide an input signal by 100x. any Tips or schematics would be awsome here's a link to the data sheet of the CD4059 http://www.ortodoxism.ro/datasheets2/4/08zpgqfhxjjawz4y7id14ph596py.pdf Thanks steelaustin

Is it possible to perform some form of data correction by finding the variance/std dev and covariance? I have a bunch data all related to a specific observation. For test purposes, i have 1000 samples of each data for certain condition. I can find the covariance between each data under this...

I am currently working on a project to build a barcode scanner. I have built the apparatus to detect a signal and am able to view this signal on an oscilloscope, however I am wondering if it is possible to build a circuit to output this signal as a binary code on a series of LED's (or something...

>Hii everybody Am having some problems and facing some dificulties concerning, the topic of operational amplifiers. More precisly: - feeding back with the inverting and non inverting terminlas, to get a ten times amplification for my input signal(DC coupled). - feed back to get an...

Hi. I have a question regarding the continuous time Fourier Transform of an input signal: x(t) \rightarrow X(j\omega) then \int_{-\infty}^{t}x(\tau)d\tau \rightarrow \frac{X(j\omega)}{j\omega} + \pi X(0)\delta(\omega) but if I want to write it in terms of f = \frac{\omega}{2\pi}...

One electromotor serviceman who worked in a small workshop needed an ac power supply with 100HZ frequency. He knew that in synchronous generator, if the magnetic flux of the field system is distributed perfectly sinusoidal around the air gap, then e.m.f generated in each full-pitched armature...

Given Klein-Gordon equation for a particle of mass m in covariant notation \left[ \partial_{\mu} \partial^{\mu} + \frac{m_0^2 c^2}{\hbar^2} \right] \phi = 0 show that the solution preserves causality, i.e. signals have a velocity not higher than c. HINT: You can build up a quantity...

Hi, I'm designing an amplifier and need help with some basic ideas (Filtering is already taken care of). My main question is bolded. The output is an audio signal, and it drives an 8 ohm speaker. The power is 1 watt through this speaker. The input signal is coming from another amplifier...

Hi, Could someone please help me with something i need to know to complete my college course? The question says: 'Show with the aid of a circuit diagram and input/output waveforms how and NPN transistor can be used as a small signal amplifier, when operating in a common emitter...

Homework Statement I need to simulate a certain circuit in p-spice, and get the transient response of a capacitor and a zener diode. I know how to do everything, except for the source voltage. The requirement is that the voltage has to be: V_{in} = 10 sin (2\pi\times 50 t) I don't know...

Homework Statement Is the system y[n] = x[n] - x[n-1] time invariant? Homework Equations The Attempt at a Solution I say no, but there's one thing I don't understand. I think if you shifted the input, and then ran those samples through the system, you'd get x[n-n0] - x[n-1]...

Homework Statement For the periodic signal x(t)\,=\,2\,+\,\frac{1}{2}\,cos\left(t\,+\,45^{\circ}\right)\,+\,2\,cos\left(3\,t\right)\,-\,2\,sin\left(4\,t\,+\,30^{\circ}\right) Find the exponential Fourier series.Homework Equations Euler’s Formula...

Hey all.. Anybody worked on an ADC ic capable of converting an analogue signal with 1GHz frequency or more to Digital signal of say 10 bits or more ?? Thanks for you time SCHNiTZER

Homework Statement If x(t) is a periodic signal with period T, show that x(at), a > 0, is a periodic signal with period \frac{T}{a}, and x\left(\frac{t}{b}\right), b > 0, is a periodic signal with period bT. Homework Equations HINT: Define x_a(t)\,=\,x(at) and...

Hi everyone, software engineer here that needs help with a basic EE project for an automotive application. I have a digital hall sensor that goes high (+2v) once per engine revolution. This high signal is used to time the ignition spark, and its frequency is used to determine the engine RPM...

I have a graph of "dBm vs Wavelength". I want the total Power in a certain area of the graph. Do I convert the graph to: "Power (Watts) vs Wavelength" then just Integrate within the required wavelength region? ie. \int_{\lambda_1}^{\lambda_2} Power d\lambda = Total Power

I'm trying to connect a signal generator as in the following configuration, my signal generator has an output port that i can connect to the capacitor in the diagram on a prorotype breadboard but what about the connection to the 3R3 resistor and DC supply? is there a special wire that goes from...