FFT window and sample
I use Signal Express but this issue applies to any software. I hope someone can help us with that. I use a card OR-9233 to measure acceleration. I put my 25K sampling rate and put a filter of 10K. I use the software to trigger.
My setup is the accelerometer mounted at the back and the back of the handle of a hammer (down where you would hold it). I was asked to measure the outcome when a small steel ball fell (slightly) to the shock of the hammer head. The accelerometer is a PCB brand 1000g pezioresistive accelerometer, (mechanical BW around 10 kHz).
My question is this: is it possible to perform an FFT when you are just going to "hit" the hammer and measure the result? I'm not measuring the real impact, only the vibrations after it is hit. When I taste, let's dire.5 seconds, I get a nice time signal, and then I apply a FFT. When I shorten the time of acquisition to 40 milliseconds, I'm obviously only enter the beginning and my looks different FFT (highest magnitude), so I started to wonder what is "real"? Operational entities designated and required a repetitive signal of the FFT? Is there a limit to how many "small" or "large" of a time signal that I have?
Looking for some general guidance as my name of field time - frequency domain skills are so right now.
I have the ability to use a sensor to measure impact energy impact, but it is a large sensor. My accelerometer is small. I'm up to the side of the accelerometer AFAIK. I'm wasting my time with a FFT?
Ok. You have a definition of the problem: say the guy marketing you can measure a difference between the two handles.
I guess that both use the same head and the head is solid metal and the handles are of different materials.
You have a way to generate a coherent stimulus. If you always to clear the ball from the same point, you should get a fairly coherent excitation of the hammers. It is possible that the way in which the hammers are hung in the framework could affect the results, but my guess is that this will be a minor effect.
I guess that the answer of the head is a complex resonance excited by the impulse produced by the ball. It will be complicated because the form of the hammer head is asymmetric (unless it's a hammer) and due to the load produced by the handles.
I'll try to measure the reaction of the accelerometer in a few places on the head of the hammer (places where he could not get hit by the ball!). If you can get something that's fairly consistent between the two hammers here, so you have a reference for comparison purposes joint entry. If the answers of the heads are very different, so it will be harder.
Then, I would look at the response of the handles in comparison to the heads. Two accelerometers, an on the head and the other on the handle, measured at the same time are ideal. I would look for differences in depreciation. In other words, the ring die down more quickly on a handful than the other? It is a measure of time, but it may require that the filter to select a unique resonance at a time. I think you want to get as much data as possible, the second half or more as you mentioned earlier. Short segments may be more difficult to interpret and not have al the information you want.
If you can post data, a person may be able to give some other ideas.
Tags: NI Software
I'm trying to make a transition from Matlab to Labview signal processing needs... Specifically, I need to smooth out and quantify a randon, two-phase sampling signal ~ 128000 in length... In matlab, I so calculate the RMS with a length of 100 samples window and no window of 1 sample to smooth.linear evelope signal; do my calculations of amplitude...
I have a problem to do in Labview... The matlab code that I would use normally is:
Variables to assign % RMS
x = signal of interest;
window_length = 100;
window_step = 1;
Calculation of % RMS
EMG = x ^ 2.
index = 0;
nWindows = floor (nrows - (window_length - window_step)) / window_step;
EMG_rms = zeros (nwindows, matches); % The pre-allocating memory
j = 1:window_step:length (EMG) - window_length + 1;
index = index + 1;
EMG_rms (index, = sqrt (average (EMG (j: j + window_length-1,));))
I tried many times with the loop for, but no luck... Ingore smileys... They must be a colon (:, to indicate all lines) followed by a)...
I have an IMAc running on the latest version of El Capitan. MY blutooth followed pad has a mind of its own - opening windows and text highlighting / deletion. In addition to this my screen keeps freezing and the spinning ball will appear.
I have an IMac running on El Capitan 10.11.6. My bluetooth followed pad has a mind of its own - opening windows and text highlighting / deletion. In addition to this my screen keeps freezing and the spinning ball will appear - I have to hold down the back of the screen to force it to close. This message of the 2 line took almost an hour to type as I have no control on the touchpad.
Thank you for reaching out to the Community Support from Apple. I know how important it must be able to count on your devices work as expected, and I have a few steps that should help resolve the behaviors you see.
I would recommend to go by resetting your management system (SCM) controller. MSC helps control and regulate different material on your Mac, including Bluetooth systems. This article will guide you in this process: reset the management system (SCM) controller on your Mac.
If you still experience the issue after the test, you can test the behavior to a test user. This will help us to determine if the problem is systemic or isolated to your user account. This article will guide you in this process: How to test a question in another account on your Mac user
If the behavior is duplicated to the test user, I'd recommend reinstalling El Capitan. This will not delete your data. To reinstall using the recovery mode, take a look at this article: How to reinstall OS X
If you experience any problems or have any questions, please let us know. The entire community is here to help.
I don't think that you have respect for those who use Firefox. Do you understand how many of us work for the House and need this platform to work for our COMPANY? I think you play games with users, at our expense.
So furious that I must try to solve your problems when I have to work. Last night you gave me a message to try to refresh. You said that everything would be saved.
I TRUSTED YOU. Available on the page at the top has been terrible, and I don't know where my addons went. Still, it seems impractical. but at least my tabs were all there.
Today, you have LOST ALL MY TABS except the ones pinned. All the windows gone, too. I copied the sqlt places of my old Firefox Desktop data to the new folder AppData profile several times. Never worked. FF just kept coming back to show me the pinned tabs.
Really, you evaluate these things first? I want to completely delete this useless refresh and come back when things worked.
Please, take a deep breath. Now:
There is no way one click to cancel a refresh, but here is a procedure to return to your prior to refresh the data. It takes 5 minutes, but it's perhaps faster than the recovery of individual files and load those into your new profile.
Check in the folder 'Old data Firefox' update adds a folder with a random semi name on your desktop. If there is only one, that probably has your old settings and Add-ons. If there is more than one, you'll want to work with one who has been updated recently.
Once you have identified the profile folder, that you want to restore, here is my "old profile resurrection suggested procedure:
Here are the steps described in more detail below:
- Create a new Firefox profile
- Delete all of this profile folder
- Copy in all of the old profile folder
Create a new profile for Firefox (Windows)
Exit Firefox completely and start up in the Profile Manager by pasting the following text in the search box of the start menu, or the start > Run dialog box and pressing ENTER:
Note: any time want to switch profiles, exit Firefox and return to this dialog box.
Click on the button create a profile, give it a name like OldSettings and skip the option to change the location of the folder. Select the new profile from the dialog box, and then start Firefox.
Open the new profile folder in Windows Explorer
Firefox in the new profile should look like a new installation of the plant. Open the troubleshooting information page by using either:
- button "3-bar" menu > "?" button > troubleshooting information
- Menu help > troubleshooting information
- type or paste everything: in the address bar and press Enter
In the first table, click on the view file"" button. Firefox will launch your new profile folder in Windows Explorer.
This folder open, switch back to Firefox and get out by using either:
- "3-bar" menu button > button "power".
- (menu bar) File > Exit
Firefox is closed, the profile folder must be front and Center, or you can activate it by using the taskbar.
Copy old data instead of new
In this new profile folder you just popped open - NOT the one on your desktop - select all content (you can use Ctrl + a) and delete (you can press Delete on the keyboard).
Leave this window open, open or switch to your folder of old data of Firefox. Consult your old profile folder. At this level, you should see a folder named bookmarkbackups among other things.
Select all (Ctrl + a) and copy (or right-click > copy or Ctrl + c).
Switch to the empty profile folder in another window and paste (or right-click > paste or Ctrl + v). This may take a few minutes because some files are large.
Firefox should start in this 'new' profile with the old resurrected profile data. Success?
I just reinstalled windows and I lost the bookmarks. I had windows old folder and I read them there. I was not able to get to the app - data and by the time wherever I did, I lost the link to the path, in that these data can be.
The Firefox profile folder is here:
- C:\Users\ < user > < profile > \AppData\Roaming\Mozilla\Firefox\Profiles\.
"AppData" (XP: Application data;) Mac: ~ / library. Linux: ~/.mozilla) is a hidden folder.
You must restore the places.sqlite file and the folder bookmarkbackups.
Make sure you remove existing places.sqlite - shm and files temporary places.sqlite - wal.
You can use this button to go to the current Firefox profile folder:
- Help > troubleshooting information > profile directory: see file (Linux: open the directory;) Mac: View in the Finder)
Question: Although my option is to show my home page at startup, Firefox still displays my my windows and tabs from last time.
I use Microsoft Surface Pro 3 with Windows Pro 10 and Firefox v 40.0.2
I chose option to start Firefox to display my home page. Please see attached screenshot. The homepage is the Mozilla Firefox Start Page. However I tried other sites such as www.cognizant.com, www.cnn.com.
I also tried to start by selecting a blank page. Always on starting Firefox displays the windows and tabs from last time.
I also deleted the (renamed) prefs.js file and restarted firefox. This step NOT solved this problem.
Help, please. Thank you
You can check if you have a user.js file in the Firefox profile folder that affects the pref browser.sessionstore.resume_session_once true value.
The user.js file will be present if you or a other software created this file and normally will not present.
You can check its contents with a text editor (right click: 'Open with'; do not double-click).
The user.js file is read whenever Firefox is started and initializes the preferences to the specified value in this file, so the preferences set via user.js can be changed temporarily for the current session.
You can remove the user.js file if you do not create this file yourself.
You can use this button to go to the current Firefox profile folder:
- Help > troubleshooting information > profile directory: see file (Linux: open the directory;) Mac: View in the Finder)
Windows hides certain default file extensions.
Among them .html and .ini and .js and .txt, and you can see only a file name without file extension.
You can check the file extension (type) in the file properties in Windows Explorer via the context menu.
In "General", "Startup", "when Firefox starts:" it does not select ' show my windows and tabs from last time. " It allows you to 'Show my home page' and 'white page '. If it is not resolved, I'm going to change browsers.
It's sad to hear that you are facing this problem. We would love to hear form you that how long you are facing this problem and what time you have updated your browser.
Please reply so that we can help you in the best possible way.
Is - this now of paramount importance that Adobe Flash Player, will also be installed on Windows and Internet Explorer? After decades of semi - master the computer, I find this embarrassing question for me. Lately, Adobe Flash Player (Shockwave) has become a pariah for many due to its hostile structure and arrogance from Adobe to help! Up-to-date facilities have been substantially no problem. Now, speaking on behalf of all the tortured, are we not all exhausted trying to fix things? Yes! Well, if is my madness of query, or is there a grain of truth? Earlier that apply forward. Thank you!
IE uses an ActiveX version while web browsers such as Firefox and SeaMonkey uses the base plugin version.
Before this version of Firefox 36.0.1, the < textarea > HTML worked in my forms. View Cart returns. In the version of 36.0.1 that they no longer work correctly. However, when I enter a carriage return, it displays a space instead of a line break. I went to test basic textarea
< textarea > name = cols 'comments' = 20 rows = 10 < / textarea >
to make sure that I was not introducing anything with other languages.
I use Windows Pro 8.1. I drove back to 35.0 Firefox and everything works fine. I installed 36.0.1 and it stops working.
I have access to another laptop also running the same version of windows and Firefox and it seems to be done as well strange things. I'm suspicious because I started to notice this immediately after a windows update last night. The laptop also known issues that he immediately after a windows update last night.
I still have another computer running a different version of windows and Firefox and it works very well. It seems that the issue is where there are windows Pro 8.1 and Firefox 36.0.1.
Guys do you have an idea what is happening here?
The current version supports the white-space for a text box property and it is possible that the Web site uses spaces: pre instead of spaces: pre wrap.
The former will prevent Firefox of text wrapping.
You can check that out in the Inspector via the context menu.
The white-space property is currently working on HTML < textarea > (bug 82711) elements.
- [1050456/questions/1050456] Problems of film to 36.0
I had just updated my KMPlayer and the new drive installed an add-on to find key that ruined my whole internet browsers...
affecting Firefox, IE key home page - find the page, I tried to change the homepage on a show, my last session one and it always return to the home page, which is the key - find page:
and after I uninstalled it, it is always to have the effect it
so I thought to change the regedit, but I can only change which opened in my home page, the home page is more key-find page, I changed it to www.google.com
But the problem persists again, tried to change the home page to "show my windows and tabs from last time" he'll always recover option from the home page...
anyway to help me clean this mess up? It's bad because I can't use my last session tabs because it is faster than clicking on bookmarks...
changed my mind, after a reboot of the PC is fixed, the add-on find key required a reboot
I put "Options/général" to display the tabs from last time. very suddenly earlier this week Firefox (I use Version 31) stop n apparent reason and since my tabs are is no longer registered despite article in the 'general' still reading of "save windows and tabs from last time '. How can I fix this? I tried one of the suggestions - remove the tick in the box next to 'do not load the tabs until you have chosen', but this made no difference. What I need to change something in the ' subject: config ' file?
As well as to happen, my favorites have changed as well. Initially, the Bookmarks imported from Internet Explorer, and those created in Firefox was in a continuous string. There is now a separate file containing bookmarks to Internet Explorer. Is it possible to combine the two sets of bookmarks in a game as they were before?
I know that the 31 Version has been updated, but the reason that I have not updated my current setup is that whenever I update Firefox something unexpected or undesirable occurs.
It is best to not double-click the .js files: flowing through a shell script from Windows with potentially unpredictable consequences. To display as text, you can right-click > edit the .js file. (However, these files contain data which are difficult to interpret.)
When the restoration of previous Session is grayed out, it can mean that Firefox (1) already restored your previous session or Firefox (2) did not find a historic session file. In this case, it seems that the #1 is more likely.
The session history works in real time? I mean, if you right click on a link and open it in a new window, then close this window, the menu history lists it as a window, you can restore?
So if you exit Firefox and restart it upward, is the closed window still listed in the history as a window menu, you can restore?
I used to have my settings set to "display windows and tabs from last time." For some reason, it does not. Whenever I close my tabs, Firefox warns you me I close many tabs, and when I reopen it Firefox, I only get my home page.
In the menu options, I put 'windows and tabs from last time' options, and in private life, I have "Firefox will remember history", so I do not think it is related to my settings.
I saw a thread on 'browser.sessionstore.enabled' must be true about: config, but I don't have even a name preference that says "browser.sessionstore.enabled. Maybe that's the problem? If so, I have NO IDEA how to fix this. I only am not at all computer savvy.
If someone could find a solution to this very annoying problem, I would be very grateful. If it takes a lot of work of programming/techno, please be VERY descriptive (pretend I'm a 5 year old child in giving directions).
Browser.sessionstore.Enabled is no longer used, worry not if you can't find it.
In case you use "clear history of Firefox closing:
- do not erase browsing history – which will prevent the restoration of the work session.
- Tools > Options > privacy > Firefox will be: "Use the custom settings for history": [X] 'Clear history of Firefox closing' > settings
Note that compensation "Preferences of Site" clears all exceptions for cookies, images, pop-up windows, installation of software, passwords, and other specific data from Web site.
Deletion of cookies will delete all specified (selected) cookies, including cookies with an exception allowing you want to keep.
You can check the prefs of . browser.sessionstore * including browser.sessionstore.resume_from_crash on the topic: config page and reset the browser.sessionstore prefs that are correct (in bold) user via the context menu in the default value to make sure that the Session Restore is enabled and functional.
FF 32.0.1. Move between the tabs that are already open, clicking on which I opened before forced to close and open in a new window, which is a real pain. It seems to happen when I have 4 or 5 tabs open, rather than 2 or 3.
Only, this happened last week, once reinstalled a clean Windows.
I searched and found a lot of people have problems with the new windows that open when they want just a new tab, but this seems to be on the opening of the fresh rather than return to already open tabs, so I can't find the same problem I describe.
This can happen if you drag a tab slightly downwards in the browser window by clicking.
Firefox has a feature called tabs
You can detach a tab in the current window and open in a new window by dragging a tab in the browser window.
You can also do this via the context menu of a tab: switch to the new window
You can drag the tab to the tab bar in the original window to cancel this detachment.
I'm using Linux Mint and Windows 7 dual-boot. I have TB 31.0 installed on each operating system. TB Linux has a capacity of calendar; in Windows, there is nothing (by nothing, I mean no calendars - I can't see their properties, for example, access somehow).
I should add that Windows and Linux TB programs share the same profile folder (located on a separate partition), therefore, all of the same modules, passwords, etc.
The error console records the following:
Error: Components.classes['@ [cid] is undefined
Source file: resource://calendar/modules/calUtils.jsm-> file:///P:/PortableApps/ThunderbirdPortable/Data/profile/extensions/%7Be2fda1a4-762b-4020-b5ad-a41df1933103%7D/calendar-js/calUtils.js
There are a variety of flow on the errors related to this.
My apologies for posting this in this way; I intend to submit this via the crashreporter, but I can't get the program crash with this error earlier.
An answer to my own question: it turns out that, while sharing a profile works quite well for most of the cases, with lightning, he does not, like the extension has different versions of Linux and Windows. The problem is solved very simply: by not using is not the same profile for each version.
Glad to see that no one takes on this one (except me, of course).
I am in yahoo mail and there is a window that has the windows displayed and I can click on one of the images of a window and it will restore the window how to access this window (size full one who possesses a collection of previous windows in a complete graph/no format)?
The window that I write the topic is a collection of previous windows images in a smaller size.
Firefox has a feature to view all your open tabs in one or more groups of tabs. You can show and hide this screen by pressing Ctrl + Shift + e. Is this the one you see, or something different?
If you ended up with more than a group of tabs and you want to consolidate them, you can drag the thumbnail images all in one group.
More information: use tab groups to organize a large number of tabs.
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