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• MacBook Pro - 7200 vs 5400 rpm drives - Heat and Noise

  - by webworm

  I am looking at a new 15" MacBook Pro for development purposes. I am planning to run a Virtual Machine for about 50% of my work (Windows 7 x64, IIS, SQL Server, and VS 2010). The upgrade from a 5400 rpm drive to a 7200 rpm is only $45. From what I understand the faster rotational speed of the 7200 rpm drive will help virtual machine performance. However, I am concerned that additional heat and fan noise might be an issue. I will be running mostly on A/C power so decreased battery life is not a major concern for me. Since I would be running with a Core i7 processor which gives off a fair amount of heat already I was wondering if it might be best to stay at 5400 rpm for the hard drive. What do you all think? Thanks!

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• Codec problem: Video noise / squares blinking as it play

  - by Havenard

  Its a weird and intermittent problem, it comes and goes with time. I thought I could fix it rebooting, but it seems that is not always. Take a look: This noise keeps blinking at the screen the entire movie. If I give up and try again an hour from now, it will be fine... weird! I have K-Lite Codec Pack installed, in my machine and many others. Its very cool, everything works perfect... but mine is the only one that does it. Do anybody know whats going on? Edit: Apparently they've just release the very latest version of K-Lite today (lol), with some bug fixes. I'll be testing it. Last time I reainstalled K-Lite the problem was gone, but came back again...

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• CPU fan making noise

  - by superb1

  CPU fan is making noise. I figured out some reasons: Cable coming out of fan is vibrating. And maybe also CPU fan is loose causing vibration. Suggest options. I cleaned the fan. But found that there is no heatsink compound /paste between processor and the fan. Is it OK? My processor is P4 2.4 GHz. Motherboard Intel 845 GVSR.

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• Weird noise while scanning, using scanimage and a Canon Lide 35

  - by Manu

  I'm trying to scan a bunch of images, using xsane's scanimage : scanimage --format=tiff --batch --batch-prompt This command scans the first picture perfectly, but as soon as I press enter, the scanner makes a weird noise, and the scanning "arm" moves very, very slowly. If I stop scanimage and start again, it scans normally again. Is there another scanimage option that I need to add? I've checked the man page, but can't see what I'm missing. Edit: the problem seems to be that the scanning "arm" doesn't go back to it's original position after the first scan.

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• MacBook Pro - 72k vs 54k rpm drives - Heat and Noise

  - by webworm

  I am looking at a new 15" MacBook Pro for development purposes. I am planning to run a Virtual Machine for about 50% of my work (Windows 7 x64, IIS, SQL Server, and VS 2010). The upgrade from a 54000 rpm drive to a 72000 rpm is only $45. From what I understand the faster rotational speed of the 72000 rpm drive will help virtual machine performance. However, I am concerned that additional heat and fan noise might be an issue. I will be running mostly on A/C power so decreased battery life is not a major concern for me. Since I would be running with a Core i7 processor which gives off a fair amount of heat already I was wondering if it might be best to stay at 54000 rpm for the hard drive. What do you all think? Thanks!

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• Sun T1000 Fan Noise - Big Issue

  - by Ed Austin

  Long and short, the T1000 makes more noise than 7 HP Servers combined. Firmware updated to latest version. PICL running under Solaris OK. Diagnostics all OK. It is driving us mad. We have a server room in our small office and we can hear this baby through thick concrete.... I cannot believe Sun doesn't mention how loud they are.... thought this was an environmentally friendly server.. Help really appreciated before it drives us all mad.

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• ADSL2+ - High sync-rate, good line attenuation, but low noise margin and slow speeds

  - by Mark Pim

  I've been with my ISP (IdNet) for a few months and have been getting some good speeds, but in the last week the speed has dramatically decreased (from 15 Mbps+ to around 0.2 Mbps). This happens at all times of day, not just peak periods. Obviously I've done all I can to isolate problems my end - only one PC is connected to the router (via ethernet cable) and no other background programs are using the network etc. I've raised the issue with the ISP and they've suggested trying a new ADSL filter to see if that is casuing the problem, but I thought it would also be good to get the opinion of superuser on possible causes or other troubleshooting I can do. Here are the juicy stats :) My router (Netgear DGN1000) reports: Downstream Upstream Connection Speed 17602 kbps 1062 kbps Line Attenuation 17.9 db 8.6 db Noise Margin 6.0 db 6.1 db I used RouterStats and it seems to show those figures stay fairly consistent all the time I ran the BT speedtest and it reported: download speed of 164 kbps, out of a max achievable of 21000 kbps upload speed of 859 kbps, out of 1048 kbps DSL connection rate 17719 kbps down and 1048 kbps up IP Profile of 15000 kbps Is there any more troubleshooting I can do? Does this look like a problem with my equipment / wiring or with BT's line? Any advice would be great :)

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• Sample uniformly at random from an n-dimensional unit simplex.

  - by dreeves

  Sampling uniformly at random from an n-dimensional unit simplex is the fancy way to say that you want n random numbers such that they are all non-negative, they sum to one, and every possible vector of n non-negative numbers that sum to one are equally likely. In the n=2 case you want to sample uniformly from the segment of the line x+y=1 (ie, y=1-x) that is in the positive quadrant. In the n=3 case you're sampling from the triangle-shaped part of the plane x+y+z=1 that is in the positive octant of R3: (Image from http://en.wikipedia.org/wiki/Simplex.) Note that picking n uniform random numbers and then normalizing them so they sum to one does not work. You end up with a bias towards less extreme numbers. Similarly, picking n-1 uniform random numbers and then taking the nth to be one minus the sum of them also introduces bias. Wikipedia gives two algorithms to do this correctly: http://en.wikipedia.org/wiki/Simplex#Random_sampling (Though the second one currently claims to only be correct in practice, not in theory. I'm hoping to clean that up or clarify it when I understand this better. I initially stuck in a "WARNING: such-and-such paper claims the following is wrong" on that Wikipedia page and someone else turned it into the "works only in practice" caveat.) Finally, the question: What do you consider the best implementation of simplex sampling in Mathematica (preferably with empirical confirmation that it's correct)? Related questions http://stackoverflow.com/questions/2171074/generating-a-probability-distribution http://stackoverflow.com/questions/3007975/java-random-percentages

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• Any way to disable specific CPU sleep modes?

  - by Philippe

  I just got a new Toshiba Tecra S11 notebook, which has a Core i5 520M CPU, and it appears to suffer from a well-known problem: a high pitched noise when the CPU is idle. Googling around revealed that this is caused by a specific power-saving mode in the CPU. In most cases, C4 mode is blamed for the noise. So my question is: is it possible to disable C4 mode (or any other "sleep" mode) using some utility or BIOS setting? I don't mind if it hurts battery life. I'd appreciate any advice on this matter. It's driving me crazy.

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• Valgrind 'noise', what does it mean?

  - by Chris Huang-Leaver

  When I used valgrind to help debug an app I was working on I notice a huge about of noise which seems to be complaining about standard libraries. As a test I did this; echo 'int main() {return 0;}' | gcc -x c -o test - Then I did this; valgrind ./test ==1096== Use of uninitialised value of size 8 ==1096== at 0x400A202: _dl_new_object (in /lib64/ld-2.10.1.so) ==1096== by 0x400607F: _dl_map_object_from_fd (in /lib64/ld-2.10.1.so) ==1096== by 0x4007A2C: _dl_map_object (in /lib64/ld-2.10.1.so) ==1096== by 0x400199A: map_doit (in /lib64/ld-2.10.1.so) ==1096== by 0x400D495: _dl_catch_error (in /lib64/ld-2.10.1.so) ==1096== by 0x400189E: do_preload (in /lib64/ld-2.10.1.so) ==1096== by 0x4003CCD: dl_main (in /lib64/ld-2.10.1.so) ==1096== by 0x401404B: _dl_sysdep_start (in /lib64/ld-2.10.1.so) ==1096== by 0x4001471: _dl_start (in /lib64/ld-2.10.1.so) ==1096== by 0x4000BA7: (within /lib64/ld-2.10.1.so) * large block of similar snipped * ==1096== Use of uninitialised value of size 8 ==1096== at 0x4F35FDD: (within /lib64/libc-2.10.1.so) ==1096== by 0x4F35B11: (within /lib64/libc-2.10.1.so) ==1096== by 0x4A1E61C: _vgnU_freeres (vg_preloaded.c:60) ==1096== by 0x4E5F2E4: __run_exit_handlers (in /lib64/libc-2.10.1.so) ==1096== by 0x4E5F354: exit (in /lib64/libc-2.10.1.so) ==1096== by 0x4E48A2C: (below main) (in /lib64/libc-2.10.1.so) ==1096== ==1096== ERROR SUMMARY: 3819 errors from 298 contexts (suppressed: 876 from 4) ==1096== malloc/free: in use at exit: 0 bytes in 0 blocks. ==1096== malloc/free: 0 allocs, 0 frees, 0 bytes allocated. ==1096== For counts of detected errors, rerun with: -v ==1096== Use --track-origins=yes to see where uninitialised values come from ==1096== All heap blocks were freed -- no leaks are possible. You can see the full result here: http://pastebin.com/gcTN8xGp I have two questions; firstly is there a way to suppress all the noise? --show-below-main is set to no by default, but there doesn't appear to be a --show-after-main equivalent.

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• Reduce unwanted noise

  - by Rajeev

  In the below code sometimes when microphone is not connected some noise is generated and the system just keeps on buzzing the same sound.Whats wrong with the code below and how to reduce the unwanted noise. Should i set myMic.setLoopBack(false) in the below code <?xml version="1.0" encoding="utf-8"?> <mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute" width="300" height="100" creationComplete="init()"> <mx:Script> <![CDATA[ import mx.controls.Alert; import flash.net.NetStream; private var myMic:Microphone; private var recordingState:String = "idle"; private function init():void { myMic = Microphone.getMicrophone(); myMic.setSilenceLevel(0); myMic.rate = 44; myMic.gain = 100; myMic.setUseEchoSuppression(true); micLevel.visible = true; //Security.showSettings(SecurityPanel.MICROPHONE); myMic.setLoopBack(true); if (myMic != null) { myMic.setUseEchoSuppression(true); micLevel.setProgress(myMic.activityLevel, 100); addEventListener(Event.ENTER_FRAME, showMicLevel); //micLevel.setProgress(myMic.activityLevel, 100); } } private function showMicLevel(event:Event):void{ switch (recordingState){ case "idle" : micLevel.setProgress(myMic.activityLevel, 100); break; } } ]]> </mx:Script> <mx:ProgressBar x="0" y="36" mode="manual" id="micLevel" label="" labelPlacement="bottom" width="100" fontSize="10" fontWeight="normal"/> </mx:Application>

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• Using Matlab to find maxima for data with a lot of noise

  - by jimbo

  I have noisy data set with three peaks in Matlab and want to do some image processing on it. The peaks are about 5-9 pixels wide at the base, in a 50 x 50 array. How do I locate the peaks? Matlab is very new to me. Here is what I have so far... For my original image, let's call it "array", I tried J = fspecial('gaussian',[5 5], 1.5); C = imfilter(array, J) peaks = imregionalmax(C); but there is still some noise along the baseline between the peaks so I end up getting a ton of local max that are really just noise values. (I tried playing with the size of the filter, but that didn't help.) I also tried peaks = imextendedmax(C,threshold); where the threshold was determined visually... which works but is definitely not a good way to do it since it's not that robust obviously. So, how do I locate these peaks in a robust way? Thanks.

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• Headset for phone calls in the datacenter

  - by Cakemox

  Datacenters are noisy places. On occasion it is necessary for an administrator or technician to troubleshoot a problem in the datacenter while on a phone call or conference call. Unfortunately, these can be long, drawn out conversations, depending on the issue at hand. Mobile phones are pretty lousy in these circumstances: the person in the datacenter can't easily hear over the noise, and the mic tends to make things unpleasant for the listeners. In-ear monitors make it easier for the person in the datacenter to hear, but don't do a whole lot for the people listening on the other end. What headset options are there for making phone calls in the noise of the datacenter less noticeable for all involved?

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• Any way to disable specific CPU idle (Cx) states?

  - by Philippe

  I just got a new Toshiba Tecra S11 notebook, which has a Core i5 520M CPU, and it appears to suffer from a well-known problem: a high pitched noise when the CPU is idle. Googling around revealed that this is caused by a specific power-saving mode in the CPU. In most cases, C4 mode is blamed for the noise. So my question is: is it possible to disable C4 mode (or any other "sleep" mode) using some utility or BIOS setting? I don't mind if it hurts battery life. I'd appreciate any advice on this matter. It's driving me crazy. FYI: I'm running Windows 7 64-bit

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• Notebook MSI GT640 - noisy fan - Ubuntu 11.10 x64

  - by pablo

  I have all time this issue when using Ubuntus, the fan (fans?) runs most off the time and between 60%~100% even in idle which is weird. The GPU temperatures are mostly around 80 degrees and I don't think it's right :( I always use Jupiter with power saving preset and add the line in linux default like this: quiet splash pcie_aspm=force i915.i915_enable_rc6=1 So it helps a little (fan just doesn't run all the time 100%...) What else can I do? The notebook spec is: Core i7-720 (8 threads) NVIDIA GTS250M So it's rather one of the first, not so silent and cold notebooks;), with Core i7 family and without optimus technology (as nvidia GPU is the only graphic card built-in) but anyway I don't have theese strange hot times in Windows 7.

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• Fan speeds up and slows down annoyingly on a Dell Latitude 5520

  - by user38175

  I' ve just bought a dell latitude 5520 and installed 11.10, my trouble is that the fan is noisy which is not regular. It is quiet for 1 minute and then speeds up and slows down every 4 seconds for 1 minute : it's very annoying. I tried i8fan things on the Internet but i didn't solve my problem, it seems to work better in windows 7 but i don't use it a lot. Dell technician came and changed the motherboard and the fan but it's still the same. I have to put music on when i'm on my computer... Anyone have the same problem or a solution?

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• Her microphone produces white noise, after a while?

  - by Wolfpack'08

  When my friend Skypes with me or gets on FB Video with me, her sound works fine... at first. After a bit, it starts sounding like loud static. It happens more frequently as we restart video chats, until it happens as soon as we open video chats. We usually restart her PC to fix the issue. Is there a process we could kill, maybe? Skip that question, if you will, and jump to these two: How do we fix this? Why is this happening?

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• HDD Producing high pithched beep noise

  - by POTHEN

  Recently I had an upgrade on one of my PC I added a 512Mb Nvidia Graphic card and 500GB seagate 7200Rpm HDD, Now the new HDD is producing a high pitched squeek/beep i cant really tell and on reboot my XP sector 63 gets corrupted, so I get reboot error. I gave the HDD for replacement but the replaced one too makes the noice, yet the HDD does not produce sound on my gaming rig.

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• Avoiding syslog-ng noise from cron jobs [closed]

  - by Eyal Rozenberg

  Possible Duplicate: How can I prevent cron from filling up my syslog? On my small Debian squeeze web server, I have syslog-ng installed. Generally, my logs are nice and quiet, with nice -- MARK -- lines. My syslog, however, is littered with this Sep 23 23:09:01 bookchin /USR/SBIN/CRON[24885]: (root) CMD ( [ -x /usr/lib/php5/maxlifetime ] && [ -d /var/lib/php5 ] && find /var/lib/php5/ -type f -cmin +$(/usr/lib/php5/maxlifetime) -delete > /dev/null) Sep 23 23:09:01 bookchin /USR/SBIN/CRON[24886]: (root) CMD ( [ -d /var/lib/php4 ] && find /var/lib/php4/ -type f -cmin +$(/usr/lib/php4/maxlifetime) -print0 | xargs -r -0 rm > /dev/null) Sep 23 23:17:01 bookchin /USR/SBIN/CRON[24910]: (root) CMD ( cd / && run-parts /etc/cron.hourly) kind of garbage. What's the clean way to avoid it?

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• Making Noise with Python

  - by Elliot

  I am trying to get python to make noise when certain things happen. Preferably, i would like to play music of some kind, however some kind of distinctive beeping would be sufficient, like an electronic timer going off. I have thus far only been able to make the system speaker chime using pywin32's Beep, however this simply does not have the volume for my application. Any ideas on how I can do this?

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• matlab noise cleaning

  - by gil

  how can i clean image from noise? i have a program that create images, and i have noises in the images, like a shadow of the object that in the image. how can i clean it? i tried to use a level, but i didn't work.

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• Htpc aka "Media Center": cheap and *silent*?

  - by Unknown

  It may be me, or the place I live (Italy), but it seems pretty hard to get a build or a prebuilt nettop or a laptop that fits the need. I need something silent able to playback all h.264 fullhd content without stuttering, and well (and not loosing the hw acceleration because of softsubs...) silent not ugly silent and (possibly) cheap. I'm going the linux route, therefore i'm moving towards a cpu-based or nvida-integrated solution (i don't think ati hw accelerated playback - or the intel "hd" acceleration - is useable yet). Ion nettop; it's either the Acer Revo (but here it's incredibly pricey and it's hard to find the dualcore version) or the Asrock Ion 330, that in the current version is rated "silent" at 26Db. 26. Sounds pretty noisy to me!!! the previous version was even worse. was this product really aimed at htpc market?? the Dell Zino - i think it's ATI based unfortunately. Laptop: correct me if I'm wrong: sub 600€/$ units are quite loud under full load (because of the tiny fans). ULW laptops are indeed quite similar: tiniest fans = high pitched noise and the cpu still lacks power for non hd-accelerated video decoding Handmade build: little money can be saved with underpowered cpus, a low-midrange cpu would help in the case of non-hw-accelerated content the cases are quite pricey the PSU one has to get ranges between 100/150 €/$ minimum to keep the noise down a low-mid build, all included, sums up to over 650 €/$ for a still-looking-ugly-unit, without the blu-ray drive. Please help. What do you advise on this? ;) Am I ignoring laptops too much, maybe? Are low-priced Acers that noisy/high pitched under full load?

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• Filtering accelerometer data noise

  - by Faiz

  Hi How do I filter noise of the accelerometer data in Android? I would like to create a high-pass filter for my sample data so that I could eliminate low frequency components and focus on the high frequency components. I have read that Kalman filter might be the best candidate for this, but how do I integrate or use this method in my application which will mostly written in Android Java? or can it be done in the first place? or through Android NDK? Is there by any chance that this can be done in real-time? Any idea will be much appreciated. Thank you!

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• eliminating noise/spikes

  - by tgv

  I have a measurement data with similar positive and negative values which should be like: ReqData=[0 0 -2 -2 -2 -2 -2 -2 0 0 0 -2 -2 -2 -2 0 0 2 2 2 2 2 2 0 0 2 2 2 2 2 0 0 2 2 2 2 2 0 0 2 2 2 0 0]' However, there are some measurement noises in the data - so the real data is like this: RealData=[0 0 -2 -2 -2 -2 -2 -2 0 0 0 -2 -2 -2 -2 0 0 2 2 2 2 -4 -1 0 0 2 2 2 2 -7 0 0 2 2 2 2 -1 0 0 2 2 2 0 0]' How do I remove the end noise from the RealData and convert it into ReqData using Matlab? How do I find the start and stop indexes of each set of positive or negative data and split them using Matlab? For instance, ansPositive = [3,8, 12, 15]' and ansNegative = [18, 23, 26, 30, 33, 37, 40, 42]'.

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• No audio from USB device on iMac

  - by brandon

  My computer froze the other day and started a buzzing noise. After I restarted in the middle of it, the buzzing persisted. A few restarts later, the buzzing stopped, but I can't get audio to come from my audio interface setup anymore. I'm using an M-Audiophile USB to connect to studio monitors, and there's absolutely no audio. I've tried restarting many times and unplugging - still nothing. Any help would be appreciated.

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