What is Digital: Definition and 491 Discussions

Digital electronics is a field of electronics involving the study of digital signals and the engineering of devices that use or produce them. This is in contrast to analog electronics and analog signals.
Digital electronic circuits are usually made from large assemblies of logic gates, often packaged in integrated circuits. Complex devices may have simple electronic representations of Boolean logic functions.

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  1. B

    Using a 8-1 MUX only (no external gates) to perform digital logic

    Homework Statement Assuming the existence of 6 digital inputs and 1 digital output, design a schematic circuit diagram using any number of 8-1 muxs (i.e. no external gates) to satisfy the following requirements:  The output is true (1) when (inputs 1 and 2 are not the same) and at least 2...
  2. I

    Equalizing a digital signal, involving Matlab

    Homework Statement A signal goes through a black box and out comes another signal. Now I have the signal that came out and need to find the signal that went into the black box. This by analyzing a test signal and the output of that test signal. The analysis is done in the frequency domain...
  3. E

    Digital Design Realising Function

    [PLAIN]http://img11.imageshack.us/img11/9320/sekv505.jpg how many gates are created for Q+ using all original and inverted variables? dont want the answer, but a way of solving it? i know it has 3 flipflops and 8states.
  4. P

    Find 4th Edition of B P Lathi's Digital, Analog Communication Systems

    hi everybody..i do need the 4TH EDITION of b p lathi"digital,analog communication systems"..can anyone help me?
  5. E

    Reliable digital data communication

    What are the parameters for reliable digital data communication ??
  6. E

    How exactly is digital information sent with radio waves?

    What I am interested in here specifically is - how are bits represented? Is it as "1" is represented with a sent photon [at those specific frequencies] and "0" with a .. silence (no photon sent) ? ... but this, in that case, would get really complicated, because other photons from other...
  7. F

    Digital vs Analog - Noise Distortion

    In my textbook it says this: "Digital communication, which can withstand channel noise and distortion much better than analog as long as the noise and the distortion are within limits, is more rugged than analog communication. With analog messages, on the other hand, any distortion or noise, no...
  8. T

    Determine the number of N of digital bits

    On an audio compact disc (CD), digital bits of information are encoded sequentially along a spiral path. Each bit occupies about 0.28 um. A CD player's readout laser scans along the spiral's sequence of bits at a constant speed of about 1.2 m/s as the CD spins. Determine the number N of...
  9. T

    A digital clock shows the time from 00:00 to 23:59 as a string of four digits?

    a digital clock shows the time from 00:00 to 23:59 as a string of four digits 1) how many contain for different strings 4 values e.g. 02:43 i got is as 290 don't think its right since there are 01,02,03,04,05,06,07,08,09,12 = 10 then there are...
  10. S

    Digital to analogue converter(DAC) using op-amp

    Hello experts! Here is 3-bit digital to analogue converter. I have a question related to this. 1)What does it mean if you have to say to perform operation on it with 101? 2)And we can obviously conclude and see output voltage on oscilloscope. But by calculation how can you predict...
  11. B

    How much of analog circuits before digital circuits?

    Hi pf, first time poster, long time lurker. The question that I have is: how much of analog electronic circuits must you know about before digital electronic circuits (I'm talking about the introductory level for both of these subjects). At my school, they offer a 2-part course in analog...
  12. A

    Building a Digital Goniometer with 2 Seven Segment Displays

    Hi guys, I am a student of Biomedical Engineering and am in my 2nd year. I am supposed to make a Digital Goniometer, for those who want to know what Goniometer is: http://en.wikipedia.org/wiki/Goniometer Now mostly there are mechanical types of goniometer and we make them electrical by...
  13. N

    Digital Communications : Distortion signal

    hey there.. i just don't know how to start answering this question.. please help me get through this question.. thanks.. A channel has amplitude response and phase shift shown in the link below. State what type of distortion is imposed for each of the inputs given below: i) (cos 20 pi t) +...
  14. M

    How does digital multimeter work?

    Homework Statement If I had two DMM's, how would I use one of them to measure the current that another DMM uses to measure the resistance of a circuit element. How would I use a DMM to measure the resistance of a shunt resistor that another DMM uses to measure current in a circuit?Homework...
  15. A

    Digital Communications: Reconstructing a 6kHz Speech Signal

    Homework Statement Consider a speech signal with a maximum frequency of 6kHz. It is sampled at 10kHz and stored. Suggest a scheme to reconstruct the toll-quality speech signal as close to the original signal as possible. Homework Equations The Attempt at a Solution
  16. N

    Digital Communications System : Ideal Communication System

    Hey there.. Got couple of questions that i hope u guys can help clarify my answer.. 1)Is it possible to design system with infinite signal to noise ratio SNR at the output when the noise is introduced by the channel? answer:No, because as long as there is noise at the channel. formula SNR...
  17. M

    Designing a digital eyepiece camera

    I have an optical design question - hopefully this is the right forum in which to ask. It is "engineer", but it's really optical engineering... --------------------------------------------------------------------------------- I am wondering if someone can help me out here with a few...
  18. S

    Is Conservation of Energy or Charge Correct in Superconducting Digital Circuits?

    Homework Statement The fundamental concept of charge and energy governs CMOS digital circuits. Your company is excited about the possibility of a truly superconducting three terminal device (i.e. a MOS device with zero on-resistance) to make logic circuits. The argument is that such a device...
  19. S

    How can a digital to analogue converter be designed to produce a squared output?

    How can you design a digital to analogue converter such that it has a squared output. i.e. the analog equivalent of the digital step is smaller at the lower voltage levels than at the higher voltage levels
  20. J

    Investigating Erratic 555 Timer Behaviour with Digital ICs

    Since I don't have a function generator, for some experiments at home with digital ICs I've used a 555 timer with 5V Vcc as the clock, and I noticed something problematic. It behaves rather erratically. I've mostly been using it to trigger a 74LS90 asynchronous 4-bit counter. Sometime it works...
  21. P

    How Can Digital Cameras Possibly Capture Violet Light?

    First, I am curious about why CCDs need color filters in the first place. It is said that they are necessary because digital camera sensors can only sense intensity of light, but not wavelength (color), which makes sense initially... except that CCD sensors operate by utilizing the photoelectric...
  22. J

    Is there a digital potentiometer that can handle higher voltage/current?

    I was using a digital rheostat to control a certain device. However, the current seemed to be a bit too much for the rheostat. All was working fine for about 5 minutes until the resistance started to fluctuate a little bit and a few minutes later, the digital rheostat became an open circuit...
  23. F

    DAC based digital potentiometer

    http://img851.imageshack.us/img851/2991/captureyd.jpg To start off, I understand that I can compute the current flowing through each of the ladder rungs, as I = Vin/((2^n)*100k), where n is the terminal ladder interested in. Doing so, I solved part a of the question for when the digital...
  24. DaveC426913

    Researching a digital photo frame

    I have a digital photo frame that's pooped out on me. In attempting to replace it, I am really disappointed with the digital photo frames I've looked at at Best Buy. Half of them did not work and the other half were so unintuitive that I could not figure out how to operate them without the...
  25. T

    Difference between analog and digital frequencies

    Homework Statement in the 1st lecture of DSP in the college the prof. tells us that in sinusoidal signals such as sin (wt) the (w) is the analog freq. in time domain but if it was a discrete signal (not continuous) such as sin (wTn).. wT will be the digital freq. I'm really confused and...
  26. P

    Digital vs. Analogue Signal Definition

    Dear all I am slightly confused over the definitions of digital and analogue signals. Is a digital signal discrete in time AND voltage or just discrete in voltage. For example, could a square wave that is continuous in time, but has discrete voltage levels be considered a digital signal...
  27. S

    Digital Design Career: Advice on Skills & Knowledge Needed

    Hey everyone, I'm currently going on my last year for my associates degree in electronics and will commence electrical/computer engineering next year. I just want to ask for any advice on digital designing (embedded systems design) careers and info. What skills are useful to have? What do...
  28. S

    Analog and Digital; Continuous and Discrete

    Is it possible to have the following signal: 1) Discrete and analog 2) Discrete and digital (I believe this one is true and very common in man made product) 3) Continuous and analog (I believe this one is also true and very common in nature) 4) Continuous and digital If a picture...
  29. B

    Changes in AC Signal Frequency with Coupling Changes on Digital Oscilloscopes

    im using digital storage oscilloscope to measure the frequency of ac signal wat will happen to the frequency of ac signal if i change the coupling from ac to dc?? will there be any changes? how to explain the changes?
  30. S

    Digital Combination Lock using simple gates and flipflops

    Homework Statement Digital Combination Lock: To create a circuit that verifies the input from a hexadecimal as 5-A-7 and then lights up an 'Unlocked' LED. (DONE) Bonus Points for: The obvious limitation of this circuit is that the combination cannot be changed. This limitation can be...
  31. D

    Courses Help Course Selection: Analogue Electronics versus Digital Electronics

    Hi, I am a student at the University of Waterloo and am entering my 3rd year of my BSc. I have an elective this semester and I thought I would take an electronics course. I feel like it would be useful for a bunch of things. In terms of my future career, and what skills would be...
  32. K

    Digital Electronics: BJT Flip Flop Circuit Diagram

    I want to know the BJT implementation of flip flop with the help of proper circuit diagram..
  33. D

    Analog to digital conversion for a project

    Hey guys, I am trying to do analog to digital conversion for a project. I don't want to use the digital chip, but want to do it in analog. I need 8-bit resolution. I found one approach: string resistor ladder. It uses 2^n-1 resistors. For 8-bit conversion I will have to use 255 resistors...
  34. K

    Meter used before digital meter?

    I didn't know where to post this question which is: What type of meter, which had very good loading characteristics, were used to measure voltages before digital meters were produced? I tried googling but it's all a jumble. can anyone guide me? thanks. Edit: is it a voltmeter?
  35. Andy Resnick

    Insights Digital Camera Buyer's Guide Introduction - Comments

    Andy Resnick submitted a new PF Insights post Digital Camera Buyer's Guide Introduction Continue reading the Original PF Insights Post.
  36. J

    Digital Ramp ADC Analysis difficulty

    I'm trying this problem on allaboutcircuits too. However they havn't been as helpful as this board is for other problems (mostly mathematics). Homework Statement I have been given an assignment which is part of, what I consider, the most difficult part of electronics engineering. Circuit...
  37. S

    Linear Algebra for Digital Image Processing

    Hello all, I am taking a course on Digital Image Processing that starts in a week. I do not know linear algebra very well and am concerned this will be a problem. I understand the stuff that is taught at the beginning of a linear algebra course, which I guess is better called Matrix...
  38. J

    How do digital cameras capture images using the photoelectric effect?

    So they use the photoelectric effect right? Does that mean when the camera takes a picture it allows photons of light to interact with a sensor for a certain period of time? How does that create the picture? If i understand it correctly the different photons have different frequencies and their...
  39. J

    Analog volume control, digital volume control

    I'm not a science student; have some basic knowledge of it. So, please explain in as much detail as possible. Thanks. I have seen some old TV sets with a round knob to adjust volume. A guy told me that it's an analog volume control while the new TVs come with digital volume control where you...
  40. chronon

    New FQXI essay contest Is Reality Digital or Analog?

    New FQXI essay contest "Is Reality Digital or Analog?" It's been a long wait but it's here at last http://www.fqxi.org/community/essay (It was actually launched 4 days ago - they seem to keep it pretty quiet)
  41. S

    Is Digital Image Processing practical outside academia

    I need to take one more course for my EE Bachelors degree in one of three specialized areas: Signal Processing, Controls, or Communications. I know all three of these are very much related, but I am finding Signal Processing by far the most fascinating field out of the three. The problem is...
  42. S

    TV Digital aerial with Tin foil to improve signal.

    Hello! This is my first post here! :) I was just wondering, after experimenting with an indoor TV aerial, Wrapping Tin foil around the base, ensuring contact with the main metal conductor, I found that it improves the signal by around 5 times! (Positioned correctly of course). I was just...
  43. J

    Networking Primer for Digital Devices - Get Advice and Resources

    I work in controls and see a trend that more and more of my work is going to be dealing with networked digital devices, can anyone recommend a good networking primer, or point me at online resources? Many thanks.
  44. J

    FFT? Digital Filter? Problem Exactly Defined

    Hello, Please help me with the following problem. Given a measured signal which has to be smoothed. A lowpass filter has to be applied. The signal is available as measured data (a data file on the hard disk, numerical, not real-time) ( it has to be applied in C or C++). The filter...
  45. D

    Using Sloan Digital Sky Survey to find Planets

    I was wondering if anyone here had experience using the image dataset of the Sloan Digital Sky Survey. Specifically, I want to find images of Mars from within their data. However, because they take one picture of the sky a night, and at a very small section of the sky, it's hard to predict...
  46. N

    Digital imaging: first down line in football

    I was asked how the artifical colored line now used in pro football games to mark the first down line is placed behind players and other images. And could not. In other words, print overlays, say with team names and scores, block the underlying field images...but somehow the artifical first...
  47. T

    Help, 2 in 5 digital error detecting question (M in N)

    Help, "2 in 5" digital error detecting question (M in N) Homework Statement Explain how a "2 in 5" code can detect all single bit errors but only some double errors in the 5-bit coding of a single digit. give an example where, in one 5-bit code of a single decimal digit a) Two errors...
  48. C

    What Are the Color Codes Used in Computers for Outputting Videos?

    Hi! I am so fascinating about the computers and digital technology... If we consider a number or a letter they have specific digital codes and compilers convert them into numbers or letters for humans... In computers each and every signal is digitalized,in that case videos are also...
  49. M

    Digital signal interface to computer

    I'm setting out on a project, and I need some basic direction. I am a programmer by trade; my father is a mechanical engineer who is pretty good at electrical circuit design as well---together we want to control a pipe organ by computer. The organ is already operated by electrical solenoids...
  50. L

    Probing high speed digital circuits

    I have a 100MHz bus going from CPU to Memory. The routing length is about 2inches. So there is no termination. When I hook up the bus to a Logic analyzer, how do I know the Logic analyzer probes are not causing any reflection and messing up the bus signals. The length of the probe is about...
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