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. E

    Where can I find active forums for advanced Digital Communications topics?

    Hello all, I have noticed that most of the posts here are not related to Digital Communications, a branch of Electrical Engineering. I search the Internet for Forums to discuss different topics on Digital Communications and I found EDAboard forums, with one forum to Digital Communications...
  2. pvvijaykumar

    Difference between digital and discrete signal

    what is difference discrete and digital signal
  3. L

    Physics and Digital Product Management jobs?

    Long story short, I currently work in digital product management, I am successful and it is lucrative. However, I never finished my college degree (originally business focused), and at 34 years old I would be starting over at this point. I was widowed a few years ago and am a single mom to a...
  4. J

    Digital control: Z transform

    Homework Statement The Plots bellow show two discrete time signals, in the plots only the initial proportion is shown. Then the signals remain constant and equal to the last value shown. Derive the Z transform of each Signal. The attempt at a solution I can get part A, giving an answer of...
  5. S

    Microwave vs Radiowave communications & analogue and digital

    Why are raidowaves used for Wifi and Bluetooth but microwaves for satellite communication among other things. I was under the assumption that radiowaves are used for communication only. What are the factors which play into this decision. Also, is there a link between frequency of a wave and the...
  6. J

    Wireless Digital Transmission

    For some reason I can't find any satisfying answers to my questions on the internet. 1. Are mostly all remotes, phones, wifi, etc. using wireless digital transmission? If so, why does a wifi signal get weaker when you move further away? The inverse square law shouldn't apply to a digital signal...
  7. G

    Morse Code Project: Building Circuit for 7 Segment Display

    Homework Statement Hi everyone. I am currently embarking on a Morse Code project which involves building a circuit to display Morse codes, eventually displaying the Morse code with a 7 segment display. I am currently stuck at the first stage as I am not sure of what to do, i.e. what chips to...
  8. Eltahawy

    Engineering Where Can I Find Good Digital Electronics Books for My Course?

    I'm in a digital electronics course studying memories and latches and flip flops and need some good books I can study from them
  9. G

    Digital Transmission and Twisted Wires

    Homework Statement I am currently embarking on a project where I have to build a communications system which can take in an analog voice signal, translate it into digital signal, and send it across to the receiver where the original voice gets recovered and it can be played back using a...
  10. H

    Circuit to control the pulse width of digital signals

    Hi all, I am looking for circuits that control the pulse widths of digital signals and their applications. Specifically, I am looking for circuits that map and a single input pulse width x to a single output pulse width y through function f(x)=y. Thoughts?
  11. fluidistic

    Bonsai shaper program, .raw from digital camera

    Hi people, I would like to create a sophisticated program that takes care of a bonsai. For simplicity let's assume that the bonsai is put into a cubic box with white walls, a digital camera able to produce .raw files and is under a compact fluorescent lamp. I want to define what I'd call the...
  12. A

    Optics: Working out distance of an object from single digital camera using the captured image

    Hi, I'm working on a project to determine the distance a pedestrian is away from a single digital camera but having never done optics before I'm struggling to find the right equation to use. I'd really appreciate any help! The method I am trying to use assumes you know the height of the camera...
  13. S

    Rf basics, digital vs analog info tx

    Sir, i need some basic information about analog vs digital signal/information transmission. i have few Questions and and idea to discuss weather its feasible or not. [Q1] can digital data requires same bandwidth as analog data contains as if i convert analog information to digital using DAC and...
  14. Giant

    How to think digital electronics?

    I'm having difficulty grasping digital circuits. I'm not even sure how to think of it.. For eg. In analog electronics when it comes to transistors I can clearly and perfectly visualize how current amplification or power amplification occurs. To further elaborate my problem,, I recently learned...
  15. E

    Signals Description (Digital, Analog, Discrete-time, etc)

    I really hope you guys can help me. On the picture below we have 2 signals. Let's call signal X the one that is drawn with a dotted line. The other one we will call signal Y. Now given the 5 options below, where one and only one can be correct, which one would you choose? A) Signal X is...
  16. ShayanJ

    Digital Pen Guide for Lenovo Ideapad S510p Ubuntu 14.04 Users

    My laptop is Lenovo ideapad S510p(no touch-screen!) and my OS is Ubuntu 14.04. I want to buy a digital pen but there are things that make me doubt it. 1)Can I find models that have no problem with linux? Which models? 2)I want to buy something cheap because I don't need high sensitivities or any...
  17. W

    Digital Root: A Strangely Interesting Operation

    Digital root (adding a number's digits together repeatedly until a single digit answer is obtained) doesn't seem like a very interesting operation, but it has some weird properties. One of the first someone might notice is that dr(n) = dr(n+9) This is fairly easy to demonstrate. But after...
  18. G

    Digital Communication Systems - Autocorrelation

    Homework Statement A white noise process W(t) with unity (N_0/2 = 1) power spectral density is input to a linear system. The output of the linear system is X(t), where X(t) = W(t) - W(t - 1) Determine the autocorrelation of X(t) and sketch it. Homework Equations Let τ denote a time...
  19. O

    Confused about declaring digital design variables?

    An example: A car that senses if you have your seat belt on and the door is closed I can declare: D - for door S - for seat belt D is 1 is door is open, 0 if door is closed S is 1 if seat belt is on, 0 if it's off This is all very straight forward and can be implemented with combinational...
  20. B

    Digital design code converter help

    Homework Statement design a code converter that converts a decimal digit from the 8 4 -2 -1 code to BCD. Homework EquationsThe Attempt at a Solution so i listed out the BCD order from 0 to 9 and listed the weighted 8 4 -2 -1 code so that the weights would equal to the BCD equivalent. 8 4 -2...
  21. Ramana

    Constant current source using digital potentiometer

    Hello Everyone, Best wishes Am new to this forum. Please need a brand new suggestion for digitally controlled constant current source. I am designing this circuit for Plating thickness measurement. I have tried a several circuits based on Analog pot but would be helpful if i get with Digital...
  22. B

    How Can You Simplify Boolean Expressions Using Only NOR Gates?

    Homework Statement Hi everyone, i am currently struggling in my digital design and logic class that includes boolean simplifications and whatnot. I seem to understand how to simplify and am able to comprehend how the karnaugh maps work but what i do not understand is for example, on our...
  23. V

    Engineering Optimizing Digital Circuit Design with Radix Four Addition

    Homework Statement Homework EquationsThe Attempt at a Solution [/B] Is there any more efficient way to solve this problem? The resultant functions are quite complicated and I was wondering if there is any way to make them simpler so it would be easier to draw the circuit.
  24. V

    Understanding Analog Signals & AC

    Also can we have an analog signal in alternating current?
  25. K

    Engineering Electrical Engineering and Digital Night Vision

    Hello, I am an Electrical Engineering student at the University of Georgia and will have to give a presentation on my dream job. I have to give specifics on what I would need to know. If I could get some input or maybe a job application that states the requirements. I know Electrical...
  26. A

    Digital Electronics- logic gates problem

    A bulb in a staircase has two switches , one at the ground floor and the other one at the first floor. The bulb can be turn ON and also OFF by any of the two switches irrespective of the state of the other switches, then what is the logic of switching of the bulbs
  27. T

    Digital scale > laptop data transfer help?

    I wonder how can I get the data recorded on a scale be transferred onto a laptop directly? forexample, I need a curve in the change in weight of something in the past minute, I am looking forward to at least one measurement per second, preferably 10 per second or much higher. The recorded data...
  28. C

    Digital Electronics Homework Help

    I need help in creating a weighted timing controller that uses 4-bit DIP switch (Weight), 1-bit DIP switch (Fast/Slow operation) and etc. The question is shown below. Creating a Weighted Timing Controller: A simple microwave oven has two cooking modes: a "Slow cooking" mode that operates on...
  29. O

    Is this a typo? Analog to digital sensor

    Homework Statement See picture. The Attempt at a Solution So, based on the two questions I looked at the graph and calculated the corresponding values a) 40 cm b) 200 I checked the solutions which say: a) 40 cm b) 20 cm Is their answer for b) a typo, or am I reading it incorrectly?
  30. O

    Analog to digital temperature sensor

    Homework Statement A temperature sensor has a full scale output of 0 to 5 volts which corresponds to a temperature range of 0 to 100ºC. If the sensor is interfaced to a 12 bit Analog‐to‐Digital Converter (ADC) with a full‐scale output range of 0 to 10.0 volts, what decimal value will the ADC...
  31. J

    Transmitting digital information

    Hi pf, please could someone explain in detail how binary information is physically transmitted. For example, consider an analogue to digital converter which is sampling a sine wave representing a voice. The sampling is using 8 bits. At a certain time let's say the sine wave is at its peak...
  32. 9

    Need digital root calculation for large numbers

    for about first 429407636 pi digits where can i get such software or how can i calculate it? (i have 1b pi digits)
  33. G

    Finite state machine (Digital) Sequence

    Hello, here is the problem that I have: Can you please tell me how to determine what is the sequence of the output. I can see it misses 101 and 010 and it repeats 000 and 100. I think both 101 and 010 are initial states. The answer I have for repeated sequence is 011, 111, 110, 100...
  34. bibo_dvd

    Engineering [Help] with Numbering System Digital Circuit

    [Help] with Numbering System "Digital Circuit" Hello Guys .. iam having an exam on digital circuits and i try to work on some problems about numbering systems and i found this problems but i couldn't solve it .. i said that (x-3)(x-6)=x^2-11x+22 then i said that...
  35. A

    Digital signal processing, linear time invariant system,

    I really confused, I found in a book that the following system, y[n]= x[n+1]-x[n], is not causal! But from the definition of causality that the output y[n0] depends only on the input samples x[n] for n<=n0,,, So I think that this system is causal... If you agree with me please tell me that...
  36. T

    RC circuit, discharge with digital signal from FPGA

    Hi all, my task is to measure the charge time of an RC circuit with a counter using FPGA, once the cap is charged, i must discharge it again for next input. Idea is to discharge it with a signal from FPGA, but what sort of circuit would allow this without discharging the cap prematurely...
  37. C

    Why does more bandwidth means higher bit rate in digital transmission?

    I'll start with what I do know: Shannon Law gives the theoretical upper limit C_{noisy}=B*log_{2}(1+\frac{S}{N}) if S = N, then C = B As N→∞, C→0 As N→0, C→∞ Nyquist Formula says approximately how many levels are needed to achieve this limit C_{noiseless}=2*B*log_{2}M (If you do not use enough...
  38. timthereaper

    What is the difference between digital controls and digital control systems?

    "Digital" Control Systems I recently took a control theory class at my local university and we learned about PID, loopshaping, and state-space methods and implemented them in MATLAB/Simulink and used an Arduino for some projects. However, I was talking with some EEs (I'm an ME) and they were...
  39. P

    Can a State Diagram Repeat a State Twice in a Sequence?

    Hi, I am designing a system to run a certain sequence when the control input is off, and then run a different sequence when the control input is on. When drawing a state diagram, for the loop where the control input is on, can the system repeat the same state twice throughout its sequence and...
  40. D

    Simultaneity & Digital Clockfaces: Understanding Relativistic Time Syncing

    I am having a hard time understanding a scenario that I have not found discussed elsewhere. It has to do with simultaneity and information content. There are two digital clocks on either end of a spaceship. Clock L on the left, Clock R on the right. They have digital displays, showing time...
  41. J

    Digital PID Controller: Windows OS, Processor Config/Software?

    I am trying to understand the process of a digital pid controller that operates with/in a Windows operating system. By process I mean the sequence of steps a computer software system takes to adjust the output of the system whether the process be cruise control, temperature, pressure etc. So I'm...
  42. Choisai

    SLMS: Liquid crystal vs Digital micromirror devices

    Hi there! I'm interested in Spatial Light Modulators for my project and I was hoping you (whoever you are) could help me. I try to explain everything as compact as possible but it's still quite a story. Sorry for that! For spatial modulation of light, a 'spatial light modulator' is needed...
  43. T

    Simplifying Digital Logic Equations: Using Karnaugh Maps and 2x2 Method

    1. Homework Statement and 3. The Attempt at a Solution Simplify the equation in the following picture using karnaugh. http://i.imgur.com/1T2HKpF.jpg I divided it into two cases, one I used the square and the other I used the 2x1. Will either method work to get the solution, or is the 2x2...
  44. T

    Digital logic - Boolean algebra simplification problem

    Homework Statement Simplify (A+B')(B+C) The Attempt at a Solution I first expanded it and got = AB + AC + B'B + B'C = AB + AC + B'C Turns out the solution is AB + B'C (according to an online source). How do we get rid of the AC term?
  45. T

    What the name of old system before digital system for record songs

    what the name of old system before digital system for record songs...
  46. T

    What is measurement unit of digital clear sound for devices

    like for example digital unit measurement for clear images in devices is ...pixel
  47. J

    Filtering Noise in Digital PID Controllers: Exploring the Electrical Components

    When speaking of filtering noise of an input or output, are the texts referring to the actual electrical components of a digital pid controller? Capacitors, resistors etc...
  48. G

    Digital Logic - Tri State Buffers

    Homework Statement I'm trying to implement the function F = A'BC+ABD+AB'D' using 3 tri-state buffers. Apparently I'm supposed to connect the buffers together and use C, D, and D' as inputs to buffers. I'm supposed to pass A and B through logic to get the input signals. I'm supposed to...
  49. N

    Digital signal processing - Pseudo Inverse Method

    Digital signal processing -- Pseudo Inverse Method Homework Statement The Attempt at a Solution (a) A =the matrix with [ .4 0 0 0 0 0 0 0 0 0 0 0; .7 .4 0 0 0 0 0 0 0 0 0; -.1 .7 .4 0 0 0 0 0 0 0 0;... all the way down to 0 0 0 0 0 0 0 0 0 0 -.1] so it is 11 x9 . w=[w0 w1 ... w8]'...
  50. fsonnichsen

    Are Digital Tablets Suitable for Math Notetaking?

    A little OT perhaps, but I have been considering using a "digital tablet" as my math scratch pad. For years I have used "marble notebooks" but it would be nice to just load my scratchings to my PC so I can email, store them etc. So-the question is-are digital tablets fine enough for this? I...
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