Digital Definition and 474 Threads

Hello All, I'm still working on my experimental control board and up to this point have been determining the best way to do the phase shifting of the input signal onto three output channels. After doing some experiments, I realized that a simple 120 degree phase shift between the three...

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...

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...

I had electronics last semester, and we went over some digital briefly at the end. I think we learned a bit about digital circuits using diodes and something about transitor-transitor logic? Anyway, at the time I was wondering if there was a way to use Op Amps to create digital circuits.

Hi Guys, I was hoping someone could explain why commercial satellite uplinks (like those used in TV broadcast) are able to achieve such high bandwidth rates vs. radio uplinks like HAM OSCAR uplinks. I don’t completely understand how digital modulation is done onto radio wave, but at 1st...

I've got a sequence of pictures from my camera of some very distant buildings (~20mi) that I'd like to digitally enhance. I took about 20 shots in rapid succession in the hopes that I can combine them to produce a better image. My first attempt will simply be to overlay them in PhotoShop and...

Are busses mostly used to carry digital signals? If yes, then why so? Why aren't buses a popular means of carrying an analog signals?

Which has a higher demand in computer engineering today? And why? i am stuck in choosing what it would be... i just can't get what these two mean... so it would be better if u please provide explanation for these two courses? And sorry if this is already been posted before... please give a link

When taking photos with a digital camera there is usually a burst of light before the photon is taken. Why is this? Is it because there is usually not enough light reflecting off the object being photographed. It is this reflected light that is what is being recorded on the film inside.

Does anybody know where i can find the Digital Circuit for an ATM Device in .ewb format??

Im not sure if this is the right place to post this but here's my question. I have to create a counter that outputs a 1 every 4th clock cycle. I can't make a truth table because it doesn't really make sense. I am a newb to digital logic and suck at it. Any one have any help. Thanks Jason

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!?

first off I'm not looking for ANYONE to do the work for me, I have already spent 3-4 hours a day for the last 6 days on this and I'm stuck. It should be easy but something screwy is going on... Here are the project specifications: Using a SN74LS193 TTL IC, (an up/down counter with a dual...

Hi, I am trying to filter noise out of data gathered from an analog to digital converter. I've looked at averaging techniques but I fear that they cause too much data loss. Can anybody recommend other smoothing/filtering techniques that might result in less data loss and can be done...

Hi, I have a electronics problem (surprise surprise) This is my problem Current system consists of a sensor which outputs a variable frequency (square wave say between 0Hz and 5000Hz, 0-5V signal) This frequency is read by a computer, which does stuff based on what the current frequency is...

I need some help designing a Digital elevator simulation using multi media logics. I need some help and guidelines as to how I should get the thruth diagrams, kmaps and the circuit going. I am required to design a digital circuit which has applications in elevator style controls. My circuit...

Hi! I have to use a Honeywell-Mellen controller UDC 3200. To heat up to 1000°C with 5°/C min. I was programming as follwing: SRAMP Time:250 EU/HR: 8500 GAIN: 60.0 but is is still fast heating ? Have you any idea how to do it? Thank you in advance!

Hi Guys, Quick question. If all I have is a 7486IC and I want to use it to make an AND gate, how woud I hook it up? Thanks, Jason O

Okie doke, I need someone here (or a collection of people working in some sort of synchronized fashion) to write for me a 1500 word assignment on the difference physics wise between analogue and digital tv broadcasting. Have fun doing it. :D

Hello, I am not an student, engineer or businessman, just a digital video hobbyist/wannabe filmmaker with an idea for a digital video product, that in my uneducated opinion, would be easy to engineer. I am looking for a person (student or otherwise) with decent knowledge of the U.S. version...

Hey guys, I'm taking a Digital Communications class and we are using the book "Digital Communications" by Bernard Sklar. I have heard from a few people that this book is not as mathematically rigorous as some of the other books in the field and therefore does not provide a deep understanding of...

I will be taking Modern Digital System Design during the Fall 2006 semester at Texas Tech University. As I am an incoming freshman, I have nobody to consult about this class. If someone could please tell me what this class is about, what I should be expecting, and/or what I can do to prepare for...

http://www.gatech.edu/news-room/release.php?id=1017 Also, regarding the recent conversations about text messaging and cheating on tests, there are cell phone neutralizers as well. They are or will soon be in theaters, restaurants, etc.

How to draw signal waveform for this digital word {11001011} ,using these codes: -OOK(ON-OFF Keying) -PSK(phase shift keying) -ASK (amplitude shift keying) -FSK(frequency shift keying) I need the guide to go through this problem or at least a useful link.

after applying Fourier transform on the interference picture i get from the object ray and the reference ray (which i captured with a high definition CCD), i can see the object again... but it doesn't look like a hologram to me... its pretty 2d dimensional looking... my guess is that my...

Which command in Mathematica will give me the sum of the digits of a number in base 10? Thanks.

This is a homework question. However, here is what I have thought about. Here is my formula for the output filtered signal: Yk = a*Uk + (1-a)Yk-1 Where "a" is coeffiecient that "weights" the current value of the unfiltered signal. And Yk-1 is the previous output signal. For some reason...

Good morning to all. By laboral reasons I am reading about digital signatures and "public key" cryptography. The most popular of the cryptographic methods related to digital signatures (RSA) is only an application of the "little Fermat theorem". This theorem belongs to "baby" number theory...

I wasn't sure where to drop this topic, so I figured General would be the best place. Anyway, here goes. I'm majoring in Physics/Mathematics and I need to begin work on my thesis soon. Only problem is I don’t have a topic. Whilst trying to find some problems and areas that link automata and...

This project brings up an interesting legal dilemma with basic public key encryption and sharing digital copyrighted material: http://monolith.sourceforge.net/ ---------- Here is the basic gist: Let's say I have a copyrighted file that is represented by the following bit sequence...

I am building an autoranging digital voltmeter as the subject line suggests and am having a problem with the ICL7107 chip that I am using. Looking at figure 15 on: http://www.intersil.com/data/fn/fn3082.pdf specifically RefHI and RefLO, with a 2V max input difference between the pos and neg...

This semester, I have a course which is a basic introduction to digital technology. I want to start a general discussion/tutorial on this subject. More specifically, some topics which I would like to cover in this discussion are, Uniform Quantisation Sampling Signal-to-noise ratio (SNR) Analog...

one of my (former) profs mentioned why the sound quality of an analog recording is better than the sound on a digital recording but i can't remember what he said. can anyone explain to me the difference, or tell me where i can find out for myself?

Hello, I am currently working on a Design Project for my Senior project, and the aim of this project is the development and construction of an interface between a CMOS camera and a computer. This interface allows a user to get images from the camera, to change some of the properties of the...

Hi all, I have a digital voice recorder from Memorex, the only problem being it doesn't hook up to the computer. It does have a earphone jack, though...through which it must output an electrical signal, which reaches the earphone and is converted to sound waves. But, is it possible to have...

"Design a digital circuit that multiplies two binary numbers by the repeated addition method (to mult. 5x4, the digi system evaluates the product by adding the multiplicand fours times: 5+5+5+5=20). Let the multiplicand be in register BR, the multiplier in reg AR, the product in reg PR. An adder...

can someone please explain how a digital to analog converter works if say your equipment includes a computer with a software like Labview, a Lab-NB board, a terminal block (USB) and an oscilloscope. what is each component doing and what is being transferred between them? thanks.

I am going be so pleased i f anyone can suggest a website where i can find information regarding the following topic: Digital video camera lens.do anyone know a website where i can download a short video regarding fiber optics.

I want to control the rpm of a brushless motor with ESC(Electronic speed controller) using PID control. Suppose my motor is rotating at 2000 rpm detecting using hall sensor setup.Now I want it to run at 5000 rpm.The speed will be controlled by PWM signals generated by PWM module( 16-bit i.e...

what would happen if u input a signal into an output pin of a chip?

The digital logic of the GPIB

My Fuji FinePix S7000 is sometimes showing lines, or purple streaks on the LCD when I take a picture. These lines and streaks are also on the downloaded photo. Is this something that can be fixed, or do I need a new camera? :cry:

Hi everyone, i am taking digital system design this coming semester, but they also call it digital logic. It has a lab, what kind of stuff would the lab be about? I scanned the textbook and it looks awfully mathematical rather than engineering. Anybody have taken this course? I did well in...

I found the following on the Edexcel Website: GCSE Specimen Paper Paper 4H Physics A [1540] URL http://www.edexcel.org.uk/VirtualContent/18085.pdf Question 1(b)(ii) “Digital signals have an advantage over analogue signals since more information can be sent over the cable. Explain...

hello everyone ... i just need a guidance to the best digital camera for normal uses ( not profssional) .. is it sony ? please specify the model also my budget is around 450 any help will gr8ly b appreciated cheers :smile:

Could anyone suggest good equipment for astrophotography? What is the most cost-effective digital camera and (digital camera compatible) telescope?

Hi everyone, I am going to take a digital electronics course next sesmester. But, I know nothing about Digital Electronics. What books do you recommand for introduction to Digital Electronics? And, any website for this course? Thanks.

This is one of the problems I have for homework: Consider a BCD-to-seven-segment decoder and suppose that the BCD data are represented by the logic variables B8, B4, B2, and B1. For example, the decimal number 7 is represented in BCD by the word 0111 in which the leftmost bit is B8=0, the...

What is the basic difference between analog and digital devices? What is the technical explanation for it?

Just noticed this site: http://www.archivefreedom.org/casehistories.htm hmm