Signal Definition and 990 Threads

Hi guys. Let's say we put a satellite on a geosynchronous orbit over the earth. The signal transmitted by the satellite does not reach the exact half of the Earth as much as you can intuitively try but is a portion formed by the two tangents from the point the satellite is on. The problem is to...

GPS modules produce a very accurate 1 second timebase signal, rms differency of about 20nS. How do you suggest of using that to split it into a 1000 pieces = 1000Hz = 1000ms ? My idea is to make a generator with a quartz chrystal and drive it into a counter module, carefully selected divide...

I have investigation on measuring the factors the signal strength from the transmitting antenna. I have some idea about measuring the signal strength. Is it true to use field intensity meter to measure signal strength with the unit of volts per metre? Thank you for helping out.

Hi all, I want to detect a 50 uV (microvolts) signal from a sensor. I was wondering what's the minimal detectable signal from the circuitry on the market/in the industry now? I know that if I have a humongous setup for noise supression, I can detect 1 uV even, but I do have a size...

I have a digital signal from EEG recording. I need to filter 50 Hz frequencies and 0.5 to 120 Hz, so I've tried this: 1. I designed a notch filter with Matlab. 2. I used fft to transform the signal to frecuency domain. 3. I applied the notch filter. 4. I used ifft to get back to time domain...

hey, i wrote this design in Xilinx of a traffic signal with pedestrain crossing. I am getting this error and have no clue as to what it is... ========================================================================= * HDL Compilation...

Hi,I am a graduate student, want to transfer from physics to electrical engineering to study communication and digital signal processing , till now I don't know so much about that. Next semester, I will be a Teaching Assistant in Electrical engineering for the first year.each semester I must...

When they say it takes about 5-6 mins to send radio signal back to earth, what kind radio signal are they talking about? Not FM/AM signal right?

This poll is a companion to the one Wallace posted recently: https://www.physicsforums.com/showthread.php?t=168166" Just as there is a certain ambiguity in that poll, so too there is ambiguity in this one. For example, you may feel that the relevant astronomical data themselves are clear -...

Hi All I would like to build a synchronous detection circuit for detecting the real and imaginary part of the signal (I and Q value), the operating frequency for the system is 20 MHz...I would like to know is there any existing chip that can generate the quadrature signal for me (cos wave and...

First of all I am not really that far into my physics knowledge (I'm still in high school). I have a projct to design an instrument and explain how is sound produced by my instrument. I was planning to make an electric instrument such as a synthesizer using my computer engineering course...

I have a problem where I have digital information on my computer and want to send it to thousands of receivers across a city that would then turn the signal into another digital signal ultimately to be displayed on a digital clock display which is already attached to another timing device. I...

Hello i need some help with a postgradyuate lesson we have. It is called signal and systems and basically starts with some introduction for signals and systems and after that basic principles we learn about Fourier and Laplace transformattions. Unfortunately i don't have any time at all to...

I am controlling a device with a 3-5kHz square wave. The device will attenuate an optical signal based on the voltage given to it, which should range from 0-5V (maximum of 20 V, but most extinction happens at 5V). I am wondering what the best way to go about doing this would be. I was...

Hello! I´m new here and need a little help with some electronics. I have signals with information in the 0.2Hz - 5 Hz range (breath signal) with a DC offset of about 3V (not constant). I want to eliminate this offset voltage but still don´t change the original information. What type of...

Hey guys, I am using the sptool GUI to design and apply filters to noisy ECG signals. I understand the concepts behind lowpass, highpass, and bandpass filters. But I'm confused with the parameters of FDA tool. Here are my questions: 1) In the FDA tool, there is a bandstop filter. what is...

i need to apply a low pass and high pass filter, as well as a band pass filter, to a plot I've made using MATLAB does anyone know how i can do this?

Will the spectra of the transmitted and received signal be different as a result of multipath reflection and noise?

i am taking a +/-5 voltage signal is supposed coming from a torque sensor. this is supposed to be equal to 100 N*m. However, -5.04 volts is actually equal to 100 N*m and 4.85 volts is actually equal to 100 N*m. I need to scale this signal to a maximum input of 200 mV for display on a panel...

A spin zero particle decays into a pair of spin 1/2 particles, each particle in a superposition state of up and down. The pair of particles head off in two opposite directions. One of them enters an apparatus that will collapse its wave function and decide the life and death of a cat based on...

Homework Statement You need to design a diffraction grating that will disperse the visible spectrum (400-700nm) over 30.0 degree in first order. a) How many lines per millimeter does your grating need? b) What is the first-order diffraction angle of light from a sodium lamp (wavelength =...

This is a question for a piece of fiction I am writing. If a some kind of transmission signal, say radio, microwave, or laser, was transmitted from a planet, could you detect where that signal was being directed to? Say, for example, you picked up a signal coming from another solar system...

I don't understand why my book is saying that this system is not invertible. y(t) = cos(x(t)) ? Wouldn't, arccos{ y(t) } = x(t) and therefore be an inverse system?

Ok I have this really simple question that is bugging me. Lets say you have the signal: y(t) = x(t-4) where y(t) corresponds to the output, and x(t) the input. I know this system is invertible, but I don't really know how to show that this is the case. I see that the output is x(t)...

Sorry, but I don't know where the topic about signal analysis should go..? ---------------------------------------------------------------------- I'm doing research about quantifying blood flow in the brain. Basically I need to know how to perform deconvolution (I think.) I have two...

Digital Cable seems to be a newer thing, which would imply cable TV up to this point has been analog. How? How can a cable accurately carry an analog signal, probably based on voltage, if cable length greatly affects voltage? Wouldn't that cause all sorts of crazy problems such as things...

Is it possible that a faulty AC power source could have an effect on receiving a sattelite signal? I had posted earlier asking what could cause me not to pick up a signal after I had moved a TV system on to my boat in the marina. I have also moved this entire system off of the boat to...

I've got a simple audio circuit that I wouldn't expect to have any signal coming out of it (the resistor at the input is a pot and is being grounded out). But the previous stage's signal is still coming through: http://img399.imageshack.us/img399/5804/opampinterferenceaz8.png * It's...

hello everyone, what stuff can i tackle on my own to learn dsp? complex variables and Fourier transforms to begin with - but what else? how do other aspects of EE play into dsp? how do i get functionality fastest!?

I moved a sattelite TV dish from my house to my boat. Set everything up as it should be but cannot receive a signal. Everyone around me is receiveing just fine. Took everything down and hooked it up at a different location and get a signal with no problem. Cannot figure out why the is no signal...

Can anybody tell a few good sources for 1dimentional signal decimation? Either books or URLs? I know how to use the "decimate" function in MATLAB thus perform decimation, but my goal is to code a function in MATLAB (or C) to perform the same process. That is why I need the theory behind...

Im trying to record about 1 second of a page signal from a cordless phone (later I might need to do this to the DTMF tones as well) so I can play it back and send it to a signal generator. I am using a VSA from Agilent, but I am not sure if it can record a full second with the bandwidths I am...

Hi I am looking for the solution manual for Fundamentals of Signals and Systems Using the Web and MATLAB (2nd Edition) by Ed Kamen, Bonnie Heck I need most of the solutions. If you could help it would be greatly appreciated. I will do anything to get the solutions. Please HELP.

Is there any kind of signal meter that can take an analog output of rotational velocity, angle etc. and show it in its full form. If there is meters like this could you recommend a few? Thanks

Algebraically calculate the Rise Time value for the sinusoidal signal at an arbitrary frequency f_0 (expressed in Hz). Assume that the signal has zero average, that is V_{min}\,=\,-V_{max} Express the Rise Time in units of the period T\,=\,\frac{1}{f_0}. MY WORK SO FAR...

Why does my phone get a signal in a metal box?? Hi guys, Earlier today I was telling someone about how EM radiation of low wavelength would have trouble passing through a cold plasma. I gave the example of the metal mesh in front of a microwave (as metal can be treated like a plasma)...

I am troubled by this question. The book for this new course seems to have different terminology then what I am accustom to. I'm stuck on this question, because I don't understand what it is asking. question) A particular signal source produces an output voltage of 30\,mV when loaded by a...

I was wondering,how do I represent graphically an analog signal components in time and frequency using an equation for example like this: v(t)=3 + 1.414cos(w0t) - 1.414sin (w0t) + 2cos(2w0t + 5pi/2) Thanks in advance for the reply!

I am interested in DSP, for the coming semester, I can only take one signal processing class, and I have two choices that I am not exactly sure what they really are: 1) Statistical Signal Processing: Detection theory and hypothesis testing. Introduction to estimation theory. Properties of...

Hello Genius guys, I am beginner in the field of electronics engineering.Well i am planning to make LED TRAFFIC SIGNAL /i know the wroking of 555 timer ic iknow the working of Multiplexer,Demultiplexer,encoder ,decoder. well can u tell me the circuit diagram of LED TRAFFIC signal 4 way...

Hey guys, I'd like to build a 400W powered amplifier for small signal input from a microphone source to amplify vocals out of PA speakers. I have found the following schematic and I have two questions for whomever is willing to help: 1) Is this circuit adequate for the application? 2)...

A spacecraft (Lo = 80 m) travels past a space station at speed 0.7c. Its radio receiver is on the tip of its nose. The space station sends a radio signal the instant the tail of the spacecraft passes the space station. (a) What is the length of the spacecraft in the reference frame...

Hello there, if I have a impulse train as f(t) with a frequency of 100 khz, and cos(w_0*t) = g(t) with frequency of 10 khz, how do I go about determining the signal spectra, (i.e. harmonics n = 1,2,3...)? I determined the Fourier transform, but I get stuck as to what to do with it. :confused...

Hello guys. I was thinking of making a project in which i convert sound signal to electrical signal which can be put to use for proper electrical work like lighting a light bulb. Can anyone help me on this issue. Like if it is already in practice and feasiblity of such project and how can i go...

let us asuume this discrete signal: f(n)=a^n * u(n) ; where u(n) is unit step function ; u(n)=1 where n>=0 u(n)=0 where n<0 ;0=<a<1 and the foruier transform for discrete signals is defined as : F(i)=sum (...

I would like to pose the question of weather or not it is feasible to extend a wireless routers signal over an extended antena which could thread through the cealing of a building to alow a signal to be used from room to room. The building in question predates wireless networking and was...

http://www.damninteresting.com/?p=318 :approve: :approve: Don't execpt to be aliens.I'am hoping it is but stuff like this could an error or a bad joke.:wink: :bugeye: Let's hope they have highly advance Universial translaters Never mind it happened a long time ago.I got to exicted sorry.

what does the classification of a signal into energy or power mean, can someone please explain the physical meaning of this, not just mathematical formulas.

Hi, Still trying to figure out things with signals and systems... It doesn't go as well as I hoped so please help me... I was checking out a computer program which allows you to specify the parameters of any kind of signal going through any kind of system and then provides you with the...

A FM radio station has a frequency of 106.5MHz. Find its signal wavelength. I am guessing that you would use the speed of sound in this problem correct me if I am wrong. So Wavelength=v/f =343/1.065*10^8 =3.22*10^-6m Is this right?