Any simple method to detect noise level of a wave

As the attached wave, is there any simple method to detect noise level of a wave.
The sampling rate is 100M, the time duration is 20ms.
Any suggestion, thanks.
Attachments:
wave.png ‏11 KB

Take your data and make a histogram of your values to get a feeling for the distributuion. Mostly a gaussians bell shape
Calc the mean and the standard deviation. 3 times the standard dev. (say an educated guess ) should be a good starting point.
or
Apply a light (5 point) median filter (filter the spikes) and look for the min/max ....
or
Get to know more about your noise and do more math ...
Greetings from Germany
Henrik
LV since v3.1
“ground” is a convenient fantasy
'˙˙˙˙uıɐƃɐ lɐıp puɐ °06 ǝuoɥd ɹnoʎ uɹnʇ ǝsɐǝld 'ʎɹɐuıƃɐɯı sı pǝlɐıp ǝʌɐɥ noʎ ɹǝqɯnu ǝɥʇ'

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Is there any native method for converting String value to Hungarian notat..

Hello. there.
This might be very simple question. but I'm just curious about this.
I am wondering if Java API offer the any native method for converting uppercased string value to lowercase which obey the Hungarian notation.
What I'm going to do is using Reflection for excuting RFC function on SAP. I was found it is very similar to JDBC Programming.
Please refer to blow codes.
//mTable
JCoTable mTable = function.getTableParameterList().getTable(rtnTblNm);
    for (int i = 0; i < mTable.getNumRows(); i++) {
     mTable.setRow(i);
     HashMap tmpData = new HashMap ();
          for (int j=0; j < mTable.getNumColumns(); j++) {
                 // I want to set key String [userNo] instead of [USER_NO] here.
          tmpData.put(mTable.getMetaData().getName(j).toLowerCase(), mTable.getString(j));
          result.add(tmpData);
} Basically, The idea was from ibatis framework [com.ibatis.common.beans.classInfo] dropcase();
Any idea would be very helpful for me. Thank you.
Edited by: hosung.seo on Aug 30, 2009 10:42 PM
Edited by: hosung.seo on Aug 30, 2009 10:50 PM

ejp wrote:
Hungarian notation is a representation of logical/arithmetic expressions in postfix form. Not what you're talking about.
So your title is very confusing to the people here who know what it means, which is probably all of them, because people read threads based on their title.From now on, I will pay more attention when I post an question.
If the titile as " +Is there any native method for converting String value to camelcase?"+ would be easier to what i'm pointing at.
As I mentioned in above sorce code, converting [USER_NO] to [userNo] isn't relevant Hungarian notation. yes, it was ambiguous. Agree! :)
But some answer wasn't fit to converting case or recognizing "underscore" delimiter. I was expecting toCamelCase() such as blew. Thanks.
    public static String toCamelCase(String name) {
        String lowerName = name.toLowerCase();
        String[] pieces = lowerName.split("_");
        if (pieces.length == 1) {
            return lowerName;
        StringBuffer result = new StringBuffer(pieces[0]);
        for (int i = 1; i < pieces.length; i++) {
            result.append(Character.toUpperCase(pieces.charAt(0)));
result.append(pieces[i].substring(1));
return result.toString();

Fan noise levels

Our MacBooks fan seems somewhat noisy, especially when working hard. We're looking to get a second desktop machine for a gameloader and Linux box, and the Mac Mini is one of our options. However, I understand that it uses the same hardware as the MacBooks. Unfortunately, the tech specs for the MacBook do not give any indication of the actual dB levels at idle or at full CPU usage, and neither do the specs for the 'Mini. Are these specs available somewhere? I've failed to find any thirdparty tests with them either, though I have't looked at all test sites out there yet... Also, the lack of dB info means we can't tell if the level of noise we're getting indicates something wrong with the machine or is just as expected.
Thanks in advance,
-Lars

Have had the same problem! I did a new OS instalation because of a remote control/front row issue. I did the upgrading of the system first and then installing the security update (3) and all the software updates. After this the problem was gone. Maybe you could run the 10.4.6 Combo updater again. I read on [email protected] this solution:
FIRST AID
- restart
- check/fix the filesystem.
- make sure you're not running out of free space on the boot volume.
- repair permissions.
- create a new user account, and see if the problem persists there.
- disable Application Enhancer, if you're running it.
- clear system & user caches.
- unplug all USB, Firewire devices except Apple mouse.
- startup in SafeBoot mode, and see if the problem persists there.
- zap PRAM.
MORE SERIOUS TROUBLESHOOTING
- unplug 3rd Party PCI cards.
- reinstall the latest combo updater.
- check the hard drive for bad blocks.
- take out 3rd party RAM.
- run the Apple hardware diagnostic CD.
But what do you mean with this one:
Secondly, the fan cycles on and off. It's very quiet, but still noticeable in a silent room
Does it mean somthing like this?
<i.e. in sleep mode or completely powered off - there is a very high pitched noise (I would guess around 15kHz) from the back of the iMac.
From: <a class="jive-link-external-small" href="http://">http://discussions.apple.com/thread.jspa?threadID=448896&tstart= 0

SRW2008MP noise level

Is it really dangerous to disconnect the internal fan ?
The noise level is very too high for a personnal home use.

Yes! Disconnecting the fan would not only cause the unit to overheat and fail but would also void any warranty you have the product. There is a Cisco Small Business Managed Switch that is fanless and thus makes no noise, but it's only an 8-port switch. Is a 24-port switch a requirement for your home use? If not, take a look at the SFE1000P.

Any simple method to detect noise level of a wave

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