Questions tagged [signal]

signal is a sequence of states in a communication system that encodes a message.

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1answer
43 views

ffmpeg - Encode audio as list of samples

I would like to produce a numeric list of amplitudes from an audio file. I should be able to: Specify the sampling rate (16kHz, 44.1kHz, etc) Specify the data type of the amplitude samples (8 bit ...
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17 views

How to detect a input signal of a non standard keyboard button ? Asus ROG laptop

I am looking for a way to trigger some stuff when I press the 'ROG' key on my keyboard which is Asus specific. When I run showkey it doesn't output any value. Do you have any idea if there's a way ...
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17 views

how to read PWM (pulse width modulation signals)

I am developing embedded Linux driver level program in Toradex Apalis Tk1 development board with IXORA career board, and with operating system is Embedded Linux. I need to know that how to read PWM ...
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2answers
43 views

How can i find out which sort of technology a propriatery wireless device uses to send their signals

Hello I'm a type 1 diabetic and I've been offered what's called a continous glucose monitor. Now I'm also sort of paranoid about having too many signals in my surrounding, I know the consensus is that ...
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56 views

How to remap interrupt signal in zsh

In bash I can remap Ctrl-C or interrupt signal to Ctrl-J by this line stty intr ^J In zsh it doesn't work neither stty intr \^J How to remap interrupt signal to Ctrl-J? OS: Ubuntu 18.04
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1answer
101 views

Bash trap command behaves differently under two terminals

I'm trying to write signal handlers in Bash scripts, testing under a Ubuntu 16.04 machine. Here I'm using the trap command: #!/bin/bash trap "echo hi!" SIGINT SIGTERM echo "pid is $$" while true; ...
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2k views

How does HDMI-to-RCA cables without converters work?

While looking for some HDMI-to-RCA converters I found out that most of them are simple cheap cables from China without any conversion circuits Kebidu 1m Wholesale 1080p HDMI Male to RCA Male Adapter ...
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1answer
25 views

what does an equality inside a plot function in MATLAB mean?

So I´m just new on MATLAB and this may be a very silly doubt but when generating basic signals for signal processing I have this: t = (-1:0.01:1)'; impulse = t==0; plot(t,impulse) (from: https://...
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1answer
34 views

How to split HDMI signal to two displays (not at the same time) [closed]

I would like to run my PC on my monitor (for work) or sometimes on my TV (for gaming), not both at the same time. What kind of adaptor am I looking for? I've tried searching but was unable to find ...
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1answer
55 views

Why does the CPython interpreter ignore TERM when run in container?

If I start a Python process in a container with docker run --name python python python3 -c "import time; time.sleep(3600)" And try to terminate this on another console with docker stop python the ...
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1answer
58 views

Can I receive stronger signals from nearby routers if I get a powerful antenna?

I have a netgear wireless wireless adapter without a antenna which i can receive signals from routers which never appear on my macbook or phone but there is AP rate limiting. Like if my friend lives ...
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2answers
5k views

Using network extender to connect to WiFi network that also requires user name

To connect to my university WiFi, eduroam, I need to type my user name and password into Windows' network configuration app (system tray, no web GUI). The WiFi signal is however weak from my current ...
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1answer
3k views

What does IOT mean in regards to SIGIOT?

I've been looking around and I found that it was related to an abort call, Something to do with an IOT trap, but any resource I find seems to assume you already know what that is. Probably isn't ...
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49 views

DTMB compatible streamer server

I know TvHeadend is an open source streamer server that supports a wide variety of Digital Television standards. TvHeadend doens't supports DTMB according to the official site. Is there any open ...
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1answer
3k views

How to reliably remove all temporary files created in a script?

Is it possible to trap the exit/return of a function? For a program I could do trap -- "clean_this" EXIT That would execute the function clean_this when the program exits. I would like to do ...
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84 views

How to automatically freeze a process when its window is not focused?

I would like to freeze Firefox when I'm not using it. I can manually send SIGSTOP and SIGCONT signals, but obviously this is annoying if not automated. I use the i3 window manager, if relevant. ...
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145 views

tmux status bar keeps echoing on gnome terminal

I'm unable to find the search terms for this problem, so I've attached a screenshot. Every minute, the tmux status bar outputs a new status line instead of updating. This seems to happen mainly on ...
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296 views

Mic signal bleeding into speakers

So this is a very strange problem. Sometimes, pretty rarely whenever I am actively using my mic I can hear myself in the speakers repeat what I've said a couple of seconds ago. I've been trying for a ...
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1answer
2k views

The shape of a Wifi router's broadcast

I'm curious as to the shape of WiFi broadcast. Does it go up, out, and then fall, like an umbrella shape? Or is it imperfectly spherical in shape? I know antenna can shape the signal to a certain ...
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2k views

How to refresh Chrome remotely?

I have Chrome running in kiosk mode (it displays my HTML/CSS/JS application - so I have control over the whole stack). From time to time, I need to refresh its static content, that is reload the HTML,...
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1answer
83 views

Cannot get signal out of GeForce 9800 GTX while installed

I am installing an EVGA GeForce 9800 GTX into one of my PCs but I cannot get a video signal out of it while it is installed. The computer works fine while the graphics card is not in it's PCIe slot, ...
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1answer
63 views

2 routers in the same network - signal issues

I've got a weird issue in my brand new house. Asked few smarter than me people, so far without success. BACKGROUND: My house has got 2 levels (ground and first floor). Internet cable from the very ...
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1answer
1k views

How do I kill a stuck ssh connection without closing the konsole window?

I use KDE (with ubuntu) and love using konsole as my terminal. I ssh a lot and every now and then (from various reasons) my connection dies and the sesson is stuck. I need to send a SIGHUP to the ...
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363 views

Weird issue with usb 3.0 port and keyboard

I bought a new computer and installed Windows 7. As I see and understand I have USB 3.0 drivers already installed. When I tried to install from Intel, I got a message that I already have newer drivers ...
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32 views

What happens when a process ready to execute but out of the CPU receives a signal?

I know pretty well what happens when it is running and when is blocked, but the behaviour when the process is in the ready queue is something unknown for me. Thank you for the time.
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1answer
3k views

Command prompt : Move running process to background

In most Linux shells, you can "stop" a running process foreground with CtrlZ and use bg to move it into the background. What's the Command Prompt equivalent? This should be a duplicate but I couldn'...
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1answer
50 views

Setting up router on wireless network

I am living in an apartment connected to a wireless network. I don't know anything about the physical router. There is no ethernet wall jack. Can I purchase a new router, set it up on this connection, ...
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1answer
869 views

Linux: How does user log out work

I'm new with linux. I've searched about how to safely log out other user and found few solution but I want to know how they work internally. I have few questions: 1. pkill -KILL -u {username} Does it ...
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1answer
2k views

My pc screen keeps starting up with Check signal cable

My pc screen keeps starting up with Check signal cable. What does this mean and What can I do? Thanks Bev
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132 views

Send an electric signal with raspberry PI

i would like to know if it's possible to Start my computer with my Rasp Zero, not with WAKEONLAN or things like that, just an electric signal as if i was pushing the power button. From a internet ...
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1answer
1k views

How to start a Google Crome app from command line?

I installed Signal Private Messenger and it's now in the list of apps at chrome://apps. How can I start the app directly app from the command line?
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1answer
498 views

How to improve wifi coverage when my router needs to be in an awkward place?

I live in a 1100 sq ft (100m²) apartment. I receive internet via an ethernet cable in a small space inside one of the bedrooms, far from the living room and the master bedroom. The router sits in that ...
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34 views

How to duplicate a tag in Signal Data Hub

I have a couple of tags setup in Signal Data Hub and I would like to know, if it is possible to duplicate these tags. Meaning, I want to keep everything about the tags the same except how they are ...
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1answer
695 views

How do I find the SNR of an ethernet connection?

iwconfig reports the signal-to-noise ratio (SNR) of wireless connections, but how do I find the SNR for an ethernet connection? ifconfig does not report it.
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1answer
943 views

ASCII code for Win+R

Is it possible to "emulate" the keystroke Win+R (or more generally speaking: any combination with Win key) with an ASCII code? It is possible to send Ctrl+Something as an ASCII code, so I wonder ...
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267 views

No HDMI signal with i3 + Denon amp

My setup used to worked perfectly : Windows 10 + i3 4330 --HDMI--> Denon amplifier --HDMI--> Samsung TV One day, I got a power outage. But once it went back, my HTPC stopped sending signal to my ...
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2answers
31 views

How to know if I have this signals in my area?

How to know if I have this signals in my area? GSM, GPRS, EDGE, 3G, 4G, HSDPA, HSPA+ and LTE I don't have any smartphone but I have a laptop.
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1answer
701 views

Why does the monitor lose signal when I turn off/on my monitor on Windows 7?

Ever since I installed Windows 7 on my machine, my monitor has been acting strangely. When I boot my machine, my monitor starts up and receives signals fine. However, no matter what if I decide to ...
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1answer
431 views

Why screen no signal only on first boot? how to fix?

Every day is the same. I arrive to the room, I turn on the PC, screen no signal. If I shut down the PC and boot again, the signal recovers, until the next boot hours later. I've had this problem for ...
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0answers
744 views

Monitor displays “no signal detected” message

I recently bought a new monitor but when I connect it to my PC I only get a "no signal detected" message. The monitor works fine when I connect it to my laptop, and my PC also works otherwise. I tried ...
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2answers
2k views

How do I connect a computer far away from the monitor?

I have an architectural practise where we use relatively powerful computers that are difficult to replicate on lap tops. Flexibility in the office is key, so I was wondering if it is possible to place ...
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0answers
31 views

Intel integrated audio signal path

I have a Dell Latitude C840 laptop. It has Intel Integrated Audio. Intel 82801 CA/CAM AC'97 Audio Controller. It has been giving me problems. Sometimes I get chopped or truncated audio, or strange ...
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2answers
212 views

Can I use a router to distribute an internet connection from a laptop?

I want to take the signal from one router, using a laptop. From this laptop, send it to another router, and distribute the aforementioned signal throughout another wireless network. I even have a ...
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1answer
1k views

Noise coming from HDD or CPU in headphones

I hear weird high sounds coming from my headphones. It is obvious that it has something to do with HDD or CPU because it's highlight sounds are heard when I it is writing data on HDD but also many ...
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2answers
29k views

Restart process on linux by its pidn number with kill command, how?

Well, I want to be able to restart processes on linux and so I looked into kill manpages for that. Apparently kill -l would list all the signals I could send to a process to do what I need, which are:...
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3answers
521 views

Why is zero treated as positive sign?

In signed int or in binary digit Zero is treated as positive sign and 1 is treated as negative sign. For example :- 1000 0000 0000 0110 = -6 0000 0000 0000 0110 = 6 But in pulse form 1 is ...
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508 views

Don't interrupt script in sh (“try-finally” for sh scripts)

I'm trying to make a simple script to wrap a command in such a way that it runs with a swapped screen. The main target is top but I wanted it to be a general wrapper. I got it running fine with bash ...
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2answers
223 views

WIFI connection?

I would like to ask a question about how WIFI connection works. I couldn't find an answer on the internet. If both devices are within WIFI range of each other, there, of course, would be a connection. ...
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1answer
75 views

What's the soonest I can send a signal to a background process (trap)?

I have a script from which I run a second script in a subshell. What's the soonest that can send a signal to the second script? script1: ./script2 & kill -SIGCONT $! script2: echo "~~ ENTRY" ...
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1answer
165 views

How do I pinpoint why wifi access is dropping

I am in a public building (ie. library) with wifi. I am trying to to pinpoint why a wifi signal keeps dropping...or find a why to work around it. My boss often uses the wifi and recently she has ...