Questions tagged [computer-engineering]

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15
votes
3answers
2k views

Why is it more reliable to use the land/pit transition in a CD-ROM?

I was reading about how CD-ROMs work and I came to this: Although it might seem simplest to use a pit to record a 0 and a land to record a 1, it is more reliable to use a pit/land or land/pit ...
11
votes
1answer
5k views

How do Thumb instructions compare to ARM instructions for performance?

A colleague mentioned that Thumb instructions were significantly slower than ARM instructions (this was for an AT91SAM7S32 processor). Is this true? What are the performance benefits of one ...
5
votes
2answers
156 views

What is the significance of a processors bit capacity?

I'm learning about how processors send an address to ram through the address bus, and receive and send data from ram through the data bus. In the videos I have watched, the processor was an 8 bit ...
5
votes
1answer
883 views

Byte organized and Word organized memory using memory modules

I'm currently learning about how a CPU works on the hardware level and something that keeps coming up is memory organization. From what I've learned (and please, do correct me on anything that is not ...
5
votes
1answer
149 views

Explanation of network interdiction in layman terms

I am trying to understand network interdiction. I have read these papers, but it is still hard to get a clear understanding of what it exactly means: Blind Network Interdiction Strategies - A ...
4
votes
1answer
832 views

How do products like the overheating Snapdragon CPU make it through quality control?

Almost all of the new Snapdragon CPU series (610, 810) have an overheating problem. This overheating problem may occur in the first few hours of using mobile phones that are equipped with the CPU, as ...
4
votes
0answers
29 views

Why are the outter tracks of a magnetic disks more stable?

In our digital computers class, the professor mentioned that the outter tracks of a magnetic disk is more reliable because the outter bit are "bigger". Isn't the packing density of a magnetic disk ...
3
votes
2answers
1k views

Use two passive CPU coolers on one single CPU?

I aim on building a silent, completely passively cooled PC, with no moving parts at all (I am aware that it is cheaper to go for an inaudible computer instead, using low speed fans. This is not the ...
3
votes
0answers
26 views

Is there a solution for USB Multiplexing, i.e. passing data between different devices by sharing/splitting a USB connection?

Forgive me if my title is vague, I will attempt to explain my issue. I don't know if such a solution exists and I have tried searching without any luck. I would like to utilize a passive USB protocol ...
3
votes
0answers
94 views

What is the proper way to handle string-to-float decimal truncation in IEEE 754? [closed]

This is not a StackOverflow question because the software engineers do not have appropriate math skills to answer an IEEE 754 question and thus must be answered by an IEEE tutor. I had to implement ...
3
votes
1answer
2k views

How to create a logic circuit that multiplies two 4 bit numbers, using only 16 2-input AND gates and 3 4-bit adders?

"Sketch a combinational circuit which takes as input, two 4-bit binary numbers, A3A2A1A0 and B3B2B1B0, and which outputs the 8-bit product P7P6P5P4P3P2P1P0. Assume that you have available sixteen 2-...
2
votes
5answers
113 views

What sensors/methods can be used from the roadside to determine if a truck is loaded or empty - without weighing it?

What sensor, using what physical principle, can penetrate a closed rectangular object like the trailer of a truck and tell if the space is empty or loaded? Why is this question relevant? One of the ...
2
votes
2answers
63 views

Screw type associated with COM port/DB-9

DB9 female port often have female slots for two screws to secure the male plug onto it. What is the type of this screw? Word 'screw' is mentioned 7 times in Wikipedia DB-9 article but not the type. ...
2
votes
3answers
131 views

Memory and Transistors

I'm asking this question as an early computer science student who is beginning to get way more interested in really low level stuff/computer/electrical engineering. I am very unfamiliar with hardware, ...
2
votes
1answer
82 views

Why laptop keyboard has so many bus lines?

I changed one laptop keyboard on the new one and while changing it I noticed that it has 30 line bus. But from my VLSI practice, I know that keyboard can use only 1 data line and 1 clock line (PS/2) ...
2
votes
1answer
171 views

How can I calculate overcurrent from over voltage for the AP9101C IC

I designed a battery charging, protection, and boost circuit for a project I am working on. However, I made a complete noob mistake and forgot to find the overcurrent value for the battery protection ...
2
votes
1answer
45 views

Computer “Ports”, port scans and daemons

If I do a port scan from the internet, do I hit a bundle of wires that are physical ports into the motherboard (like a PCE port)? Or do I actually go into the operating system and interact with the ...
2
votes
1answer
267 views

MSP430 - Semaphore - C language

I'm dealing a C code here which is run on MSP430 LaunchPad. What I need to do here is modifying the program, so that at the push of the button, the micro cycles through 4 different modes: LED1 ...
2
votes
1answer
88 views

How do I hook these components together to get my desired functionality?

I have a big button http://store.2xlnetworks.com/thebigbutton/ and a display counter Microframe Model 265 https://www.microframecorp.com/d0265-6-digit-rugged-computer-controlled-display . I want the ...
2
votes
1answer
198 views

Difference Latches and Flip-Flops [closed]

I am trying to understand the difference between Latches and Flip-Flops, as an example: RS-Latch and RS-Flip-Flop. In my lecture script the only difference is that latches are level triggered and Flip-...
2
votes
0answers
83 views

Connect a GPU to a mobile FPGA using

Please indicate if this question would be better asked on other fora, I'm not an engineer but computer scientist, and have very little experience with FPGA's / ASICs. As far as I understand from ...
2
votes
0answers
463 views

What optics and display are used in Microsoft HoloLens?

How does Microsoft project an image so close to the eye yet understandable by the brain? How is the display transparent? This link has good information but is speculative. https://www.reddit.com/r/...
2
votes
0answers
133 views

Using magnetic field readings for linear gesture recognition

I am thinking about using a permanent magnet as an input device for my smartphone. I have been reading some papers about it, but I really want to understand how things work. Using the integrated ...
1
vote
2answers
441 views

How can I vaporize metals?

What are some common ways that I can vaporize Metals into a vacuum chamber? How can I keep these Metals in a gaseous state?
1
vote
3answers
37 views

Placing an accelerometer on arbitrary position and define this as the new coordinate system

I'm working on a small home project and I'm looking to use an accelerometer for tilt sensing. I would like to be able to place it anywhere on the object. If I place it in a way that the coordinate ...
1
vote
1answer
93 views

How to introduce the CONSTITUTIVE equation into structure mechanics [closed]

Suppose I have stress and strain relationship and it can be simplified to the equation $\sigma=Function(\epsilon)$. This is the CONSTITUTIVE equation of the material I want to do research. Assume ...
1
vote
1answer
137 views

Relation between residual stress and von mises stress calculated by FEA in comercial software

Suppose we do nonlinear structure mechanics computation. In each time step, we can get the results and can get Von Mises Stress at each node of the mesh. Can we say this number also means its ...
1
vote
1answer
181 views

How to find the smallest change in voltage

You are comparing different A/D converters that will have 3.2 V and -3.2 V as their positive and negative reference voltages, respectively. Out of the following, converter _ can resolve the smallest ...
1
vote
1answer
67 views

What can I use to calculate distance? [closed]

Please excuse my ignorance in advance, (I'm in cs not EE), I am trying to figure out how can I get the distance from a car to a wall, what form of technology could I use IR sensors, ultrasound, etc.(...
1
vote
1answer
25 views

If you have a small fan that blows hot air, and a larger fan that blows cold air against it, what happens to the hot air?

For context, I have a laptop that has a fan that sucks in cold air from the top on the left side (for cooling the cpu), and a fan that blows hot air out the bottom on the right side (for cooling the ...
1
vote
1answer
50 views

How did scientists develop the stencils that made even more precise processors than they had previously?

The history of computers seems somewhat pervasive since there are so many steps in modern manufacturing and so many changes in trends with transistors over many years. Grasping how we got to our ...
1
vote
1answer
54 views

Similarities between OBD-II and VGA

I'm working on a project to make a Heads Up Display in my car. I need a way to present my project in front of my class, for I obviously cannot bring my car into the presenting room. My professor ...
1
vote
1answer
50 views

DLX assembly synthax

I see some example of DLX assembly instructions such as: LW Ri, 0 (Rz) but I can't find out why Rz has brackets around it.
1
vote
1answer
1k views

Is it possible to send ESC/POS commands to EPSON TM-T88IV Printer through Windows command line?

I am interested in learning more about ESC/POS commands. I have an EPSON TM-T88IV printer connected to my PC via parallel cable at port LPT1. Connected to this printer is an APG Cash Drawer. The PC is ...
1
vote
1answer
455 views

How to represent floating point numbers using logic gates?

Using the formula given at the start of the question, I had to convert the numbers in part (a) to floating point notation. My answers for part (a) were: (i) 1111.2^11 + 111 (ii) 1111.2^11 + 000 (iii) ...
1
vote
1answer
245 views

How to get similart Geomagic two stl file deviation in free Cloudcompare software?

I need to compare two STL (Dental model Scanned) files and find the deviation between their points, SO this two STL files have different boundary, so i already used the GEOMAGIC Control software for ...
1
vote
1answer
6k views

How to detect what wattage that my Windows laptop is receiving via USB-PD?

I don't know too much about USB-PD. I understood that USB-PD requires negotiation between the charger and the receiver. So probably my Windows laptop (Dell XPS 9570) should be able to know the current ...
1
vote
0answers
17 views

motion gesture and axis definition

I read something about defining hand gesture, which include mid-air hand gesture (e.g a peace sign with the two fingers moving one after another), touch-based gesture (e.g. on touch screen), and ...
1
vote
0answers
148 views

Multiple sensor data to WiFi visualized on React Native app: Guidance [closed]

Objective: I want to connect multiple sensors to an item of equipment and visualize the data real-time on an iPad. Mock of Desired Output: Question: I need advice on the best methods to use to ...
1
vote
0answers
22 views

Confused about information on a state transition table

I'm working with a State Transition table with a variable I can't identify. Here's the table: I'm pretty sure "a" is the present state. "b" is the next state and Sx and Sx+ are the inputs. ...
1
vote
0answers
32 views

MIPS Assembly stalls and forwarding when a register's value isn't modified in previous step

I'm going over pipelining and stalls and forwards with MIPS architecture, and there's a couple things I'm uncertain about. If two adjacent instructions, such as the first two of each set bellow, both ...
0
votes
2answers
78 views

Computer engineers — do computers use varying amounts of power? [closed]

My friends and I are trying to hypothesize how computers use energy. Please settle the debate. Do computers, or any other electrical device of the sort, e.g. 3d printers, use different levels of power ...
0
votes
1answer
30 views

Can you perceive similar kind of “humanizing” of technology in other fields of engineering than computer science?

So I've noticed that computer science has actually been developed so that it has become more human and less technological in the sense that development has raised the abstraction level up to a "more ...
0
votes
1answer
25 views

How is the most basic display driven?

I am curious how taking the most basic display such as this OLED one that works with the ardunio is driven: i.e. We are using just a clock and data line to drive a 128x64 pixel display. The pixels ...
0
votes
1answer
50 views

How exactly do noise canceling headphones work?

I purchased a pair of noise canceling headphones today and I was just wondering how exactly they are able to cancel out background noise?
0
votes
1answer
21 views

What is the mechanism of transition in applications of finite state automata?

Just began studying automata. I've already seen several examples of the applications of finite automata: pattern matching, automatic doors, etc. And so far, I understand the logical connection between ...
0
votes
1answer
3k views

BTech or BSc engineering [duplicate]

My question has two parts. What is BSc engineering and Btech engineering ? Which has the highest validity in electronic and computer fields? PS : Specially in North American region.
0
votes
1answer
27 views

How can I transmit signals from pre-amplifiers to a laptop nearby using bluetooth?

I am trying to collect signals from preamplifiers (Aquarian Audio preamps, PA-4) and have them sent to a laptop nearby wirelessly, I have not found a dedicated device for this process, and the ...
0
votes
1answer
152 views

How does punched card computer circuit design work?

I am trying to understand the underlying process of computer circuits from the beginning. I am reading about punch cards. I have come across several youtube videos and articles which are useful. ...
0
votes
1answer
27 views

Deep out-of-order buffers

I was reading about the new Intel Xeon Phi processor on Intel's site https://software.intel.com/xeon-phi/x200-processor/remote-access and ones of its features is: Highly-parallel performance: ...