signal is a sequence of states in a communication system that encodes a message.
1
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0answers
16 views
ssh: propagate signal to remote process
This is the general version of: Send SIGTERM signal to a process running inside ssh
It is possible to send Ctrl-C to the remote process if the process gets a pty (-tt):
# Runs for 5 seconds
(sleep ...
0
votes
1answer
81 views
What are likely causes of this wifi signal noise that could be causing dropped connections?
Seeing a reverse sawtooth-shaped noise spike in OS X Wi-fi Diagnostics that is associated with wireless connection drops. My wireless router is old, so it might just be dying. It seems to be somewhat ...
1
vote
1answer
207 views
How can I kill a parent process only?
I have the following processes.
ParentProcess
-- ChildProcess
-- ChildProcess
-- ChildProcess
How can I kill the parent process only? I want the children processes not to be killed. If I try to ...
1
vote
0answers
61 views
Router in repeater mode
We have a Buffalo AirStation WHR-HP-G300N as the main router. We also have an Asus RT-N53 router located one floor higher. I've set the Asus router to act as a repeater for the Buffalo. There is a ...
0
votes
1answer
28 views
Signal Loss over Length
This is in regards to coaxial cable...
I'm looking at low loss Cable to run a wireless receiving antenna to an outdoor wireless bridge rated to handle extreme cold. So far, what I'm trying to decide ...
0
votes
0answers
94 views
HP - monitor suddenly turn to sleep, DVI port show no signal
I'm currently using a HP Z400 Workstation with 3D nvidia quadro 600 graphics. However,recently I have been encountering the problem that either the CPU restart out of sudden, the monitor suddenly show ...
1
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0answers
44 views
Is it possible to make a stopped process survive a shutdown?
I know that a program can receive a STOP signal and just sit there until it receives a CONT signal. Now knowing exactly how this works, I'm curious whether whether there's any way to have a STOPped ...
0
votes
1answer
25 views
Signals: Kernel-generated only?
Can processes really "generate" signals or they just request the kernel to send the signal on their behalf?
And what about hardware interrupts? Do they get translated to software interrupts? Like, ...
0
votes
1answer
119 views
Wifi signal changes over time
I have a trouble about my wireless router signal. My laptop is 25-30 feets (about 8 meters) away from the router. Between them there're 2 walls. Windows reports signal strength is two bars, and ...
0
votes
1answer
114 views
Way to produce “constant” SPDIF audio signal to receiver? After 5 minutes of no audio signal, receiver switches from 5.1 to 2.1 surround
I have a specific problem with my receiver that I have hooked up to my PC. I have the receiver hooked up to my PC using SPDIF digital audio, and the receiver defaults to 2.1 surround mode when playing ...
0
votes
1answer
111 views
Can temperature change affect graphic card or monitor to change analog signal and cause blurry image?
My computer is located near the window, and I noticed that when I open my window, after a minute or two the picture on the screen often gets blurry and I have to press "auto" to make it sharp again. ...
3
votes
1answer
184 views
Inserting gpu in motherboard makes video signal of motherboard dissapear?
Is it normal that when you connect a GPU to a motherboard, the video output from the motherboard connectors disappear, and only the GPU connectors give the video output?
This is relevant to me ...
1
vote
1answer
119 views
Samsung S23A750D 23" 120Hz get no signal
I have a few days ago received this monitor.
Samsung S23A750D 23" 120Hz
I am using it with a Gainward Nvidia GTX570 Phantom GPU via DisplayPort cabling.
The trouble I am having is that the monitor ...
15
votes
6answers
1k views
Can a huge coiled LAN cable have some trouble for transmitting a signal?
Let's say I have a long (> 30m) LAN cable, that connect two (very close) devices.
Could some of the unused wire, disposed as a huge coil, cause any issue ? I'm thinking about the special wire layout ...
2
votes
0answers
44 views
reading a trigger signal
I have a data acquisition card (Matrox Solios) which uses an input trigger signal to trigger a connected camera. This card is connected into the computer through a PCIe port. The device came with a ...
0
votes
1answer
165 views
HDMI Screen loosing signal in Safemode
I recently got a ransomeware at my computer so i decided to start up in safe mode to do a recovery but when I choose safemode my screen turns and the message "No HDMI Signal" appears. I've tried ...
1
vote
1answer
2k views
Asus monitor does not get HDMI signal after “Starting Windows” screen
I have an Asus 247H monitor which I hooked up to a Gigabyte motherboard's (GA-Z77-D3H) on-board VGA port at first. Soon after I got my hands on an HDMI cable, I tried to replace the VGA one with it. ...
1
vote
1answer
3k views
Meaning of line-bars in wifi signal strength, dB and negative values?
If I connect to wifi AP with 1 line of strength, does it mean that I will get only 1/5 of AP's bandwidth?
I mean, do these lines tell me whether I will receive a full bandwidth or only a part of it?
...
3
votes
1answer
1k views
Video “no signal” but computer still running
Update
Not doing anything in particular during these blackouts... Usually just when im doing nothing, sometimes im watching a video, sometimes playing a game... but mostly just whenever. I mostly ...
0
votes
1answer
771 views
Wireless repeater shows 54 mbps G when configured for 300 mbps N
I have an Encore ENHWI-2AN34D as a wireless repeater in my WLAN. The router is a TP-LINK TL-WR1043ND 300 mbps N and the repeater is 300 mbps N too, but when I check signal strength with inSSIDer or ...
0
votes
1answer
261 views
Loss of net access seemingly due to WiFi signal clash with repeater
The apartment I live in has a single corridor opening into rooms A,B,C,D adjacent to each other. The WAN ethernet terminates in room C where I have a Netgear WGR614v7 router installed. This router has ...
0
votes
0answers
131 views
After leaving display on overnight, I cannot get the Windows login screen up on the display, via the DVI cable alone, no matter what I try
When I come back to my computer, after leaving it on overnight, the display gives me a no signal message. I cannot get the Windows login screen up on the display, via the DVI cable alone, no matter ...
2
votes
2answers
3k views
How do I troubleshoot low wireless signal strength on my Dell Studio XPS?
My Dell Studio xps laptop has just started experiencing extremely low signal strength. I did set up a wireless printer the other day, so maybe I screwed something up in the process.
Here's what I ...
1
vote
1answer
654 views
no DVI signal during bootup 'till OS loaded
I connected a new display (ASUS VS229-H) to my computer using the DVI-cable which came with the display. I only see "no signal" on screen until the OS log-in screen is loaded.
The previous display ...
0
votes
0answers
150 views
How can I reverse my router to boost wifi
I have a Linksys N Router model E3200. I do NOT have the internet, but use WiFi on my laptop a MAC Book Pro running Lion. Since my wifi goes in and out all the time. I was wondering how to use this ...
0
votes
1answer
81 views
Why does Unix deliver signals this way?
In Unix, when signals are posted, and the receiving process is running more than one thread, at first a thread is chosen to carry out the signal handling routine.
I don't understand why that is ...
0
votes
0answers
343 views
How to make a Shell Script create a copy and terminate itself?
So far I used
trap " call function" 2
fucntion
{
./test.sh
exit
}
but it never reaches the exit line and a whole bunch of process piles up any one got any idea?
I tried & (bg) but i need to ...
2
votes
1answer
397 views
Does IE10 have an audio API?
Is there any way to do any audio processing(FFT,etc.) with javascript in Internet Explorer ?
Does anyone know if IE10 does/will have any audio processing apis (similar to the Mozilla one) ?
3
votes
1answer
723 views
No signal after log off/ switch user
Periodically my monitor will go black and display "no signal" before turning off (power save mode) when I log off Windows or switch users. It doesn't do this every time, although most of the time the ...
0
votes
1answer
474 views
Trap ctrl-z key to perform cleanup
All,
I have a shell script where I want to call a function to do some cleanup if user presses the ctrl-z key(SIGTSTP signal). I read about the trap command and found an example where I can trap the ...
0
votes
1answer
121 views
In which program I can generate signal with 3 harmonics 1000Hz frequency?
Generate signal with main harmonic - 1000Hz frequency and two other harmonics (second and third) with the same frequency.
I found Audacity but I don't know how to do such there. Help me please.
P.S. I ...
0
votes
0answers
82 views
Monitor loses signal when switching users
Periodically when I log off from Windows my monitor will lose signal. The machine powers down normally when I press the power button on the case so I think it is running normally aside from that.
...
3
votes
3answers
2k views
SIGTERM with a keyboard shortcut
I know that inside a terminal, Ctrl+C keyboard shortcut will send a SIGINT signal to the current foreground process. Is there a way to setup a keyboard shortcut for sending SIGTERM or even SIGKILL to ...
0
votes
1answer
102 views
Where should DVI signal be converted?
I recently read that the only difference between DVI and VGA is that DVI is digital whereas VGA is an analog signal. This means it might gain noise along the way or if the cable is cheap. I currently ...
2
votes
2answers
396 views
Get rid of buzzing noise when playing videos over ethernet-over-power?
Just bought one of these guys, and it's able to stream 1080p video across my house, but now there's a soft buzzing noise coming from my speakers. I'm guessing it's interference from my powerlines? ...
2
votes
1answer
646 views
Are there any softwares on Windows to measure bluetooth signal strength?
I was wondering if there are any softwares on windows that can measure the signal strength of the connected bluetooth device?
0
votes
0answers
78 views
Establishing “SIGWINFOCUS” as a standard [closed]
As a corrolary to this question, which I've been thinking about since reading it, what would it take to get something like SIGWINFOCUS established as a standard signal along with SIGWINCH? Obviously, ...
3
votes
1answer
2k views
What Can I do to Improve Cable Link/Signal Quality?
I have a cable TV and Internet connection which have been suffering from low SNR (Signal-to-Noise Ratio) since late April. I've contacted my provider regarding this problem several times to get it ...
2
votes
2answers
2k views
Will I get a better wireless signal by just replacing the antennas?
One of the antennas was broken on my wireless router (Billion 7800N). It has 3 external antennas and I was wondering whether it is worth replacing all 3 with better/larger ones?
Potential results I ...
3
votes
1answer
195 views
Fedora Linux: Way to use stty (or equivalent) to bind key to raise SIGUSR1 for application?
I'm using FC 14, but this is probably a fairly generic Linux question.
I want to be able to bind a key in the Linux terminal driver that will cause a signal other than SIGINT or SIGQUIT to be raised ...
1
vote
1answer
136 views
Linux: Typical amount time before kill after term?
In linux for a typical reboot/restart what is the standard amount of time given for a process to shutdown once given the term signal before the system kills it?
3
votes
2answers
757 views
Connecting a Wifi router to receivers with a cable instead of antenna?
This is a very strange question--I'd go so far as to say it's a stupid question.
I'm being told that it is possible to, to describe it briefly, use a cable to connect an access point and a receiver ...
0
votes
1answer
908 views
Any microphone testing program? [closed]
I have an idea of testing the microphone quality by playing sound of various frequency in the speaker and compare it with the recorded sound. It should be able to tell you the SNR at different ...
2
votes
2answers
241 views
Redirecting serial port keeping ability to send signals
I have the following scenario: a laptop running Windows XP, connected to a meter through its serial port.
I need to read/write to this serial port from a remote computer (running windows 7). I also ...
1
vote
1answer
533 views
How to increase the strength of my wireless signal? [duplicate]
Possible Duplicate:
Improve Wireless Signal
Hello! I have some wireless connection from my college through the dormitory where i am living. The connection is really strong in the living ...
1
vote
2answers
9k views
Samsung monitor displays only “Check Signal Cable”
I suddenly got a 'Check Signal Cable' after turning on my monitor. It was working this morning I checked the vga cable. Inserted it to another monitor and it worked I have a
Samsung S19A300B
Radeon ...
3
votes
2answers
170 views
How do I decide where to place my AP in order to minimize interference?
We have an AP and I'm wondering if we can reduce interference by moving the AP to another place.
I know that other APs can interfere and I've set the router to use channels that are more free.
But ...
0
votes
2answers
185 views
WiFi router installation/signal problem
I got 2 questions concerning my WiFi router:
I got my D-Link router 3 years ago and recently the signal is getting weaker especially toward the end of the day. Why? Sometime it's so weak that I ...
0
votes
1answer
507 views
Play a WAV through /dev/console
Is there a way to play a WAV through /dev/console? (without being root)
The same way the shell command
/dev/urandom > /dev/console
produces a random sound
cat music.wav > /dev/console
...
8
votes
4answers
2k views
How to block bluetooth signals?
We're developing software for bluetooth devices. We'd like to test the case when the device gets out of range, but don't want to carry the device to the other end of the office for each test.
What is ...
