Signal Definition and 989 Threads

Is usual cell phone capable to be programmed to produce pulsed modulated signal? For example having repetition rate 60 Hz with pulse width 30 microseconds?

hi I would like to ask, what is all about a "signal injection test" ? How is it done and what one expects to see ? I ve read about it in some Higgs study/plots CERN has published thanks Alex

Hi, For any biomedical applications, the sensor output has to be amplified and digitized. For amplification, we use Instrumentation amplifier. But the output of IA has some dc voltage. So, how to suppress the dc voltage. At the same time, all biomedical signals are low frequency signals in...

Homework Statement Hi, for a project for school, I need to implement the Discrete Haar Wavelet Transform to compress an audio signal. This would be fine and dandy, but I do not really understand how to use the the DHWT. Could anyone direct me towards some resources that would be very helpful...

Homework Statement Design the following circuit, common source with source resistance, in fig. (1). It uses the MOSFET (irfp244) where Vt= 4.15V, KN = Kn(W/L)= 2.87 A/V2. Assume vin = +/- 100 mV, DC offset = 5 V, and the frequency = 1 K Hz. a) Design R1 and R2 so that the small signal output...

Hello, I've got a modulated signal - Y(f) (the question doesn't say if AM or DSB or whatever) which it's spectral modulted signal is shown(in the file I've uploaded).its is modulated by a carrier of sum of several COS. It asks what is the average energy or power( I should decide) of the...

A 200mv peak to peak sinusoidal signal is applied to an ideal 12 bit A/D converter, for which Vref(v p-p full scale) is 5v. Find signal to noise ratio. This is a problem worked out by one of my lecturer and the answer seems to be 46dB. But I am confused on his method. Is there anyone who...

I've been reading on how the distance to the moon is calculated by bouncing a laser signal on the retro-reflectors and measuring the time it takes the light to return to Earth, but what I've seen is that the retro-reflectors do a good job of minimizing scattering by returning the signal along...

Hello everyone, I'm currently working on a RF energy harvesting system. I need a transceiver like characteristic. But instead of transmitting and receiving into the same plane. I need the energy to be received on one side and then transmit on another side. Basically follow the diagram...

Hi, I have two ultrasonic transducers and a pulser-receiver(5072PR). One is the contact transducer, A120S (6MHz), from Olympus and the other is also contact mode transducer, but it is a customized ring-type transducer (2.X MHz) (like doughnut). I have two questions. First, when I turn on...

Hi, I've been trying to understand DSSS, but I'm not an engineer and have trouble with one point. I get the fact that multiplying the user signal with the chip sequence is what spreads the signal. My question is, why is this? If the data rate is, say, 1 bps, and the chip sequence 1000 bits...

Hiyo, Could someone please explain to me how exactly, or why, does the ground electrode in ECG minimize the interference? And, also, why is it said that the patient could be at risk because of the ground electrode? I really don't get it, so if there's anyone here who could clarify this...

I can't understand why you can remove T2 from this circuit when you make the low signal analysis. Can anybody explain me please ? https://www.physicsforums.com/attachment.php?attachmentid=57825&stc=1&d=1365838694

Let, x(n) = 3.9 cos(0.80πn + 0.2π) be the discrete-time signal obtained by sampling a continuous-time signal x(t) at a sampling rate of 578.4 samples/sec. Find possible expressions for x(t). Hey all, I am quiet unfamiliar with this type of question, and haven't been able to put anything...

Hello i have a question about Random Signal Processing and the frequency domain. If i understand correctly one cannot use the Fourier transform to represent a stochastic process in the frequency domain. What is therefore used is the Power Spectral Density: S_X(f)=F\{R_X(\tau)\} Were F...

I'm a junior electrical engineer at a NY state school I'm looking to get my masters in EE with a specialization in signal processing. What are the best graduate schools for this? Thanks

Homework Statement Alpha=0.91 ,beta=2.92, T0=0.91 Homework Equations The value of a0 for the square waveform The Attempt at a Solution 1/T0 * area = 1/0.91*(2.92-0.91)*0.91

What is a difference between sine Signal Generator and AC power supply?

Hi All, Since I myself hate reading long posts I will cut to the chase. I graduate in June with a B.Sc in electrical engineering and am hoping to go for graduate studies. During the last four years I took courses in almost all areas of electrical engineering. The only field I liked AND...

The circuit above uses a voltmeter to measure the voltage allotted to it through a potentiometer and the varying voltage acts as a signal. Could this signal system also work by measuring the current allotted to a load based off the position of the potentiometer (i.e. higher voltage = higher...

Compute the power contained in the periodic signal x(t) = 10.0[cos(160.7πt)]^4 The problem I have is I end up with a constant value for ak for all values of k -I start by using inverse Euler formula -Do the appropriate integration -Then consider k for odd and even values My working is...

How does a modern clock signal sychronize a computer command? What does pipeline mean? Lets say that the cpu being considered is an intel product.

Homework Statement Base station transmits signal t which is received by two antennas such that: x = h1t + n1 y = h2t + n2 where n1 and n2 are independent additive white Gaussian noise with variances σ21 and σ22 respectively. h1 is the channel gain between the base station and receive antenna...

I have sought information about different approaches(fields) to neuroscience and how they differ in terms of understanding how the brain works. I'm interested to learn more about neurobiophysics, computational neuroscience and engineering perspectives. In engineering especially about brain...

I have designed a common emitter amplifier using a BJT and I need to perform a DC analysis, followed by a small signal AC analysis, on it. Before I continue, I will admit that this is homework, but please don't stop reading yet. I am not looking for anyone to do these analyses for me, but I...

I always record all my tv programs and watch it in much later time. I am actually like a year and half behind the current schedules ( I just started the 2011-2012 season!). The advantages are I can skip commercials and the most important thing, I can watch the coat hanger season finale and...

I have given the question and my attempt in the image that i have loaded please tell me that am i doing it right ?

1)A note consists of a fundamental frequency and the multiples of that frequency called harmonics. Peak frequency means that one that contributes most to the note. Is the fundamental frequency always the peak frequency? Since the frequencies die out very quickly as the value of n increases...

Reconstructing a signal using an equilizer "filter" function Homework Statement A low pass signal g(t) is sampled at a rate of ##f_{s} > 2B## needs to be reconstructed. Sampling interval is ##T_s=\frac{1}{f_s}## The reconstruction pulse to be used is $$p(t)=∏(\frac{t}{T_s}-\frac{1}{2})$$...

Homework Statement The signal g(t) is band limited to B Hz and is sampled by a periodic pulse train ##PT_{s}(t)## made up of a rectangular pulse of width ##1/8B## second (centered at the origin) repeating at the nyquist rate (2B pulses per second). Show that the sampled signal ##\bar{g}(t)##...

Hi PF, I have a signal which is sum of 2 sinusoids having frequencies 6KHz and 12KHz. Now if I sample it at a rate of 16KHz and pass it through a ideal Low pass filter having 16KHz cutoff frequency, what is the signal I obtain. What frequency contents does it have. Please help me...

How does body motion control occur? For example, walking on high heels during a strong wind is pretty hard. There is a compressible fluid flow across the body, the center of mass is changing all the time, you have to balance on a tiny surface area, sensor data from the skin, eyes, ears, etc...

hi i want to to create a small robot controlled by Bluetooth of cell phone but i wondered about how the robot can receive this signal ? what is the technique i should use in my tiny robot so i can control it ?

Can anyone help my to see why my solution is wrong because the in the solutions it says that it is not time invariant

Discrete signal x[n] is shown in the first picture. Sketch x[2n] Answer Can anyone ecplain why x[2n] is like that. I can understand how to plot it if i have a continuous time signal

Hi, I'm an A Level student at college (take it easy, I'm still very much learning) and I'm currently looking into a small demonstration of resonant inductive coupling, or "Wireless Electricity".. I'm fairly confident with the theory behind it and the majority of the build for it. However, one...

I'm doing some research with MATLAB, where i have a simple chirp. y = sin(x.^2) i take the FFT of the chirp, set the upper half of the FT of the signal to 0, and take the IFFT of this to recover the original chirp y with real and imaginary parts. then i use the formula for calculation of the...

I have problem in building my mini-project as stated in the topic.I am actually confused how the robot will follow a signal like micro wave or radio wave, this kind of wave just spreads and the robot will get confused where to go.I just want opinion what shall i do that the robot will come to...

I have just started a course on signals and systems and am finding the subject confusing. This question pertains to the transformations of the independent variable which is time in this case. I don't know why it is transformation of the "independent variable" as the time axis is the same as it...

Hello all. I have a data signal that I'm looking to reduce the noise in. I'm recording voltage at 12000hz and am getting high frequency noise induced by nearby power supplies in the lines that I am using. The noise amplitude is approximately .2-.3 Volts and the signal I am trying to get out...

Hi: when using op amp as differential amplifier, can it used for input signal isolated from power supply of that op amp? as this figure: http://uploadpic.org/storage/2011/k9bEue1EtqkWGlH5yTDN3198.jpg so if the input signal is sinewave 5 Vp.p, will be the output of this op amp...

We have a PC with digital-to-analog converter. With help of this converter we generate “pure” sine: y(t)=A*sin(2π*f*t+ ψ) with industrial frequency 50 Hz. This signal goes as input to electricity generating plant which has a goal to raise this signal and give to its own output. During this...

is it true that analog signals are the logarithmic version of the natural signals... and hence the name a-na -log.? what is the meaning of infinite information contained in analog or continuous valued signal? please elaborate

hi , does input light signal for laser amplification has to be provided by the external source or it is created by lasing material itself?

http://arxiv.org/abs/1206.1616 Strong Evidence for Gamma-ray Line Emission from the Inner Galaxy - Meng Su, Douglas P. Finkbeiner Analysis of data from the Fermi telescope shows "monochromatic" gamma ray emission at 130 GeV from the centre of the galaxy. This paper is generating a lot...

Alice is transmitting an electromagnetic beam to Bob. Assume it is a well collimated beam, like a laser beam, or a maser beam. As Bob's distance from Alice increases, his signal strength decreases according to the well known inverse square law. Eve, the eavesdropper, is beside the beam, not...

Hi: when we use Limb lead placement(RL,LL,RA and LA electrodes) we can obtain six signal: I,II,III,aVR,aVL and aVF The question is: Are These six signals shown(on paper or screen) individually? or there is another method?

Homework Statement I'm stuck on the following problem: A linear system has an output of G(\omega ) e^{-i \omega t} to an input signal of e^{-i\omega t} where omega is arbitrary. If the input signal has the form f(t) = \begin{cases} 0 \\ e^{-\lambda t} \end{cases} where lambda is a constant...

Homework Statement You observe a star with a count rate of 0.1 counts per second and the background is 0.05 counts per second. (a) How long do you need to observe for in order to detect 100 counts from the star? [2] - 1000 seconds (b) Estimate the signal-to-noise reached in the exposure...

Homework Statement 1. We need to design a low pass analog filter using anyone of the MATLAB routines: buttap,cheb1ap, cheb2ap,ellipap. Find analog filter's poles, zeros, and gain. Which would be the best to use and why? 2. Design a digital IIR from the analog filter with the following specs ...