Time Frequency Analysis

Is there any way to perform time-frequency analysis(spectrogram ) in DIAdem? Ideally, I got like to play the waveform in one section of the VIEWER and other section of the VIEWER would have the spectrogram of the data within the band cursor.
Does anyone think this is possible in DIAdem?

Hi Neuropotential,
What you're asking for is possible, but it's not an out of the box feature. We have a posted example application for doing joint time frequency analysis in REPORT at
http://zone.ni.com/devzone/cda/tut/p/id/3549
You could set the same sort of thing up in VIEW with the new 3D Contour Area available in VIEW in DIAdem 11.1. I'm curious how you'd like the interactive part to work in VIEW and also how large your data sets are.
Brad Turping
DIAdem Product Support Engineer
National Instruments

Similar Messages

Joint time frequency analysis in Signal Express?

Is it possible to do joint time frequency analysis in Signal Express? I didn't see it in the Analysis section, so I'm assuming it's a separate tool that has to be added, if even possible in Signal Express. Help?
Solved!
Go to Solution.

SignalExpress does not natively support joint time frequency analysis. However, check out the Sound and Vibration toolkit which expands upon SignalExpress. It may do what you want.
This account is no longer active. Contact ShadesOfGray for current posts and information.

Frequency analysis of time varying data

I want to add a routine for frequency analysis of before and after strong impulse on a body.
Some vibration sensors will be attached to the body.
In this case, I was told I need to use a time-varying method like wavelet or any other to analysis instead of simple FFT.
I installed wavelet package but I have no idea how to use it.
(Wavelet method seems to be popular in reduction of noise.)
Only what I want to know is the frequency elements in dynamics.
Can you recommend any tools (functions) for my purpose?
Are there some LabVIEW examples?
I am using LV2009 and some extra toolkits (developer suites).
labmaster.

labmaster wrote:
I want to ask some curious things.
1. I have to analysis the spectrum of frequency in dynamic signal.
In case of presenting dB, how to know the frequencies?
2. In high sampling rate (1MHz), the low frequency element can't be analyzed. (too small window for 60Hz in my last example).
If so, generally, do I have to down sampling to ~1kHz for the 1MHz in wavelet or short time FT?
Take a look on how the Express VI you are using are made. The Express VI you are using is located here
C:\Program files\National Instruments\LabVIEW 2010\vi.lib\addons\Time Frequency Analysis\_express\_TimeFrequencySpectrogramConfig.llb
The VI you need to open is the configure.vi. Copy this VI to your user.lib folder before doing any work on it.
To answer your first question. The dB setting will change the Y axis scaling, and not the X axis scaling. Which is the frequncy axis
The step between each frequncy bin will be( number of Frequency bins/(Fsample/2)). So using 1 MHz may reduce resolution. Perhaps 10 KHz will be bettter for you to use.
Besides which, my opinion is that Express VIs Carthage must be destroyed deleted
(Sorry no Labview "brag list" so far)

Frequency Analysis on Adobe Audition CS5.5 for bioacoustics research

Hi everyone,
In need of some help.
I research whale/dolphin sounds, and have previously used Raven Pro for analysis. Ive found Adobe Audition produces a much better spectrogram (think it must be the FFT algorithm) and allows me to visualize a lot of whale calls that I may have missed previously by visual inspection on other software.
I need to measure these calls. Basically I need the duration (seconds), minimum frequency (kHz), maximum frequency (kHz) etc.
I have played around with the Frequency Analysis tool in Adobe Audition, and this cannot compute these figures for me at all. In Raven, it was extremely user friendly, and all you had to do was highlight the call by moving your cursor over and selecting the call, and in the left hand window, it would tell you the min F and max F and duration for that swatch that you had highlighted. Is there any way of doing this in Adobe? I know you can visually see on the right hand side the Frequency axis- but it doesn't give you the exact frequency i.e. I need it to be to 2 decimal places eg. 2.12 kHz minimum etc.
I have inserted a screen grab of what I mean when you "highlight the call".
Is there any way of doing this? I would be incredibly surprized if Adobe Audition does not have the ability to do so. But I have read through the manual and gone through a lot of threads and just can't find any information on it. Any help would be greatly appreciated!!!!!!!
Thankyou so much in advance
Bec.
p.s. Whilst Im asking, is there anyway to change the time format in the "Selection/View" box? Ive seen you can display it many many ways, but I need it in seconds, and the most sensible time format is mm:ss.ddd. Is there anyway I can change it to just ss:ss? There are a bunch of options for frame times, but nothing else for actual time.

becbioacoustics wrote:
I need to measure these calls. Basically I need the duration (seconds), minimum frequency (kHz), maximum frequency (kHz) etc.
I have played around with the Frequency Analysis tool in Adobe Audition, and this cannot compute these figures for me at all. In Raven, it was extremely user friendly, and all you had to do was highlight the call by moving your cursor over and selecting the call, and in the left hand window, it would tell you the min F and max F and duration for that swatch that you had highlighted. Is there any way of doing this in Adobe? I know you can visually see on the right hand side the Frequency axis- but it doesn't give you the exact frequency i.e. I need it to be to 2 decimal places eg. 2.12 kHz minimum etc.
I have inserted a screen grab of what I mean when you "highlight the call".
Is there any way of doing this? I would be incredibly surprized if Adobe Audition does not have the ability to do so. But I have read through the manual and gone through a lot of threads and just can't find any information on it. Any help would be greatly appreciated!!!!!!!
When you highlight a section, in the bottom right corner of the screen you'll find the timing section, and in there the box marked 'duration' will show you exactly how much time you've highlighted. In Frequency Analysis, the way to note highest and lowest frequencies is, unfortunately, manual and involves finding them with the cursor and noting the cursor information (under the display). If you open the advanced window, you'll get more information, including the level of the frequency at the cursor position. Also there's a bug in the display (or more to the point, the way it's calculated) which means that if you highlight just one section in the spectral view, this isn't what the Frequency Analysis display shows - I'm reporting that one.
p.s. Whilst Im asking, is there anyway to change the time format in the "Selection/View" box? Ive seen you can display it many many ways, but I need it in seconds, and the most sensible time format is mm:ss.ddd. Is there anyway I can change it to just ss:ss? There are a bunch of options for frame times, but nothing else for actual time.
No I'm afraid there isn't. I did try a cheat to see if I could at least get the timeline to do this, but that won't work either. Yes I think it should be there as an option too...

Frequency Analysis? How do I get frequency characteristics of a signal given in .wav format ?

I am new to Labview would really apprecite your time and help...
frequency Analysis? How do I get frequency characteristics of a signal given in .wav format ?
I have attached the signal I am trying to analyze.
Have nothing to offer in return but gratitude
Cheers !
Message Edited by Komal Khalid on 04-11-2010 10:59 PM

If you have labview 8.x or 9.x you can do this. Go to help in the toolbar. Select "Find Examples" and then search for sound. Locate the "Sound File to Sound Output.vi" This example will help in your task. Remember that Labview is shipped with a lot of useful examples. That can help you in your learning process
Good luck
Ps you can also read wav files, and find examples in Labview 7.x. But I do not know the name of the similar examples in 7.x
Edit: Please use zip files then you are not able to attach files. Do not link to sites outside. The site you linked to was very annoying. Could not download
Message Edited by Coq Rouge on 04-12-2010 02:38 PM
Besides which, my opinion is that Express VIs Carthage must be destroyed deleted
(Sorry no Labview "brag list" so far)

Zoom Frequency in Frequency Analysis

Is there a way to zoom in on a range of Frequencies in the Frequency Analysis? I'm looking for noise below 200 Hz but would like to know more specifically which frequencies are involved.
Thanks,
David

You need the Zoom Panel.
Click on the third icon from the left in the second row - this has a + with up/down arrows. The more times you click, the greater the zoom in on the frequency spectrum.
You can drag up or down in the right hand end of the display - where the frquency is displayed - to pull the frequency range that you are interested in into the frame.

Frequency analysis freeze

Since I use Audition 3 to do analyses of sound/music, I often use the frequency analysis window to compare slightly different versions of the same waveform. Normally, you can do this by getting the freq anal for one version assigning it a color from the four colors on the top right hand corner of the freq anal window. Then you put the cursor in the same place on the second waveform, and compare it with the colored spectrum you made from the first version.
But every once in a while, the frequency analysis freezes and refuses to change when you move the cursor anywhere. Strangely enough, it will move to show the spectrum in real time as the cursor passes over the wave form. But if you want to put it in a single place to compare spectra, the freq anal window doesn't change.
I think this must be a setting problem, but I don't know which. Can anyone help?

I know this has happened to me before, but I couldn't tell you exactly how to fix it. All I can remember is that fiddling with the advanced options made it work again somehow...

Automatic lot creation based on time Frequency

Hi,
For 01 inspection incoming inspection ,
F or certified vendors, without inspection , material is getting posted to UUS without lot creation. ( QI info record settings).
but for this case , business requirement is to get automatic lot creation based on time like 6 months once .
Automatic lot to be created for this certified vendor on time frequency basis. how to trigger this Lot creation based on time.
Help.
VV.

Hi,
In std SAP we dont have option of generating Automatic lot creation based on periodic basis. But we can provide some workaround soultion.
Option 1:
USe Source Insepction concept. Here Inspection lot will be created for every P.O. Here u can relase P.O line items in QI07 which can sceduled in Job planning on periodic basis. Use Skip inspection lot concept to skip unwanted lots. This has direct relation with Q-Info record.
Option 2:
U can generate automatic lot creation based on Stability study concept. Here are the following steps
Initiate Stablility study
Create Initial sample
Perform intial test
Confirm initail sample
stability planning
Define storage condition
create testing schedule
store stability sample
define cycle start
schedule
complete stability study.
Option 3:
To get Automatic lot creation u can use BAPI QPL1_INSPECTION_LOT_CREATE . When a due date come for inspection,it created a lot of 01 / Z-01 inspection type automatically through QA01( call the program ,enter the inspection lot origin & material,vendor & save). Create Z-T code which has vendor material plant combination.
Execute the above T-code based on Periodic basis.
Explore above 3 options and choose best one according to ur requirements.
Edited by: Lokesh K on Oct 12, 2010 11:27 AM

Time series analysis

I'm studying at University and currently working on a time series analysis in assistance with Oracle 10g R2. The aim of my analysis is the comparison of two time series tables, each table contains two columns, 1st column comprises the date and the 2nd column comprises the value (price). The standard functionality within Oracle (this includes also the statistical functionality) doesn't support any time series analysis.
I’m searching for a code or script in PL/SQL which supports the analysis I’m doing such as cross correlation or others. Any help I’ll get in this regard is highly appreciated.
Thanks in advance

Well, maybe your real problem is more complex, but on provided dataset, would it not be sufficient?
SQL> with table1 as(
2          select DATE '2007-03-30' dt,72.28 price from dual union all
3          select DATE '2007-03-29',72.15 from dual union all
4          select DATE '2007-03-28',72.13 from dual union all
5          select DATE '2007-03-27',71.95 from dual union all
6          select DATE '2007-03-26',72.00 from dual union all
7          select DATE '2007-03-23',72.00 from dual union all
8          select DATE '2007-03-22',72.02 from dual union all
9          select DATE '2007-03-21',71.13 from dual union all
10          select DATE '2007-03-20',70.75 from dual union all
11          select DATE '2007-03-19',70.38 from dual ),
12 table2 as(
13          SELECT DATE '2007-03-30' dt ,33.28 price from dual union all
14          select DATE '2007-03-29',31.73 from dual union all
15          select DATE '2007-03-28',33.74 from dual union all
16          select DATE '2007-03-27',32.21 from dual union all
17          select DATE '2007-03-26',32.50 from dual union all
18          select DATE '2007-03-23',33.79 from dual union all
19          select DATE '2007-03-22',34.04 from dual union all
20          select DATE '2007-03-21',32.18 from dual union all
21          select DATE '2007-03-20',42.15 from dual union all
22          select DATE '2007-03-19',38.10 from dual)
23 select
24 t1.dt,t1.price p1,t2.price p2,
25 corr(t1.price,t2.price) over() correlation
26 from table1 t1,table2 t2
27 WHERE t1.dt=t2.dt
28 /
DT                          P1         P2 CORRELATION
30.03.2007 00:00:00      72.28      33.28 -.73719325
29.03.2007 00:00:00      72.15      31.73 -.73719325
28.03.2007 00:00:00      72.13      33.74 -.73719325
27.03.2007 00:00:00      71.95      32.21 -.73719325
26.03.2007 00:00:00         72       32.5 -.73719325
23.03.2007 00:00:00         72      33.79 -.73719325
22.03.2007 00:00:00      72.02      34.04 -.73719325
21.03.2007 00:00:00      71.13      32.18 -.73719325
20.03.2007 00:00:00      70.75      42.15 -.73719325
19.03.2007 00:00:00      70.38       38.1 -.73719325which shows rather negative correlation - by rising prices in table 1, prices in table 2 decreases?
Best regards
Maxim

Time series analysis in Numbers

Has anyone done any chart showing time series analysis in Numbers? I could not find a way to change the axis to reflect the right data series.

Hi sanjay,
Yes, Numbers has a different style. Instead of a single large, multi-purpose table, Numbers uses several small tables, each with a purpose.
To plot a time series (or any Category graph) the X values must be in a Header Column. Here is a database of measurements over time as a tree grows:
That database can be left alone. No need to juggle with it. You can even lock it to prevent accidental edits.
A table to pull data and graph them:
Formula in B1
=Tree Data::B1
Formula in B2 (and Fill Down)
=Tree Data::B2
Next graph, pull some other data
(Scatter Plots do not require X data to be in a Header Column. Command click on each column to choose.)
Regards,
Ian.

Issues with Single Frequency Analysis

Hi all,
I recently installed multisim 13 on a new computer. I went to do a simple single frequency analysis of an RC circuit and got some funny results. The magnitude of the voltages measured by the probes seem to be off, and I have never experienced this on any other computer I have used. I have tested it in multiple circuits and always get the same problem. I was wondering if there is some setting I am missing that will change this, but I have searched forums for two days now and haven't come across this particular issue. I have attached some images to show what I'm describing.
Thank you
Attachments:
circuit.JPG ‏33 KB
output.JPG ‏56 KB

It looks to me like it's working properly for the default source "AC analysis magnitude" (1Vp). How did you get the source to say "VRMS"? What version of Multisim are you using?

Frequency analysis of vibrations

Hey guys,
I have a "little" problem.
An emetted vibration is captured (with a laservibrometer) and the signal should be analysed so that
the emitting source can be recongnised (Quality contol)
How could I perform a frequency analysis of the signal in order to find out its caracteristics.
See the example of signal below
Thx
Lauvia LabView V. 7.1
Attachments:
test[1].vi ‏146 KB

There are several FFT VI's. Probably the best for your case would be a power spectrum.
-Matt Bradley
************ kudos always appreciated, but only when deserved **************************

I am using a DAQ board to get the singnal now i need to perform frequency analysis and this system doesn't employ any filters etc it's just a signal

Iam using AT-MIO-16E-2 board to retrieve the signal now i need to perfrom a frequency analysis and this process doesn't employ any filters etc.

There are a lot of shipping examples that you can look at. They're under Analyzing and Processing Signals>Signal Processing. There are software filters and window functions that you can use but if you are having aliasing problems, then the only thing you can do is add hardware filtering.

Problems with Frequency analysis

I use the frequency analysis a lot for comparing specific points on similar tracks. Every once in a while, the freq anal will stop live-updating. In fact, it will not register a changing in the cursor position on the edit or spectral freq view at all. Has anyone had this problem and found a solution?
Thanks,
Senluga
ps, I have tried lowering the FFT size to no effect.

If you want to have the 'good frequencies', you must set your dt.
if you use LV6 and waveform, the dt is the inverse of your sampling
frequency.
If you use older version, you can set your dt buy bundling dt value and the
array of point. you also can set the multiplier value in the
attribute/propertie node.
dt is always the inverse of the sampling frequency.
Jerome LANGE
Strasbourg
[email protected]
"Colt" a écrit dans le message news:
506500000005000000EB7B0000-1021771306000@exchange.ni.com...
> When I make for example an FFT, i want to see the frequencies on the
> x-axis which are in the signal.But in my Labview Diagramm the values
> on the x-axis have nothing to do with the frequencies in
my signal.The
> FFT seems to be correct,but the x-axis doesn't show what I want to
> see.I don't know what I have to change. In some NI examples it
> works,but I can't see why.

Adobe's Frequency Analysis-VST VERSION

I really like the way you did about frequency monitoring in AA 2 or 3. And, to be honest, I'm used to it pretty quickly.
But, for some reasons, I am moved to another DAW. I have tried a LOT spectrum analyzers, tried all the best vst in this direction, and all they did not come close to subject.
So my predictable question to Adobe's developers: Can you make VST version of frequency analysis, that contained in Adobe Audition 2/3? I'm really sure, that this idea will become popular and will get high demand. Thanks, I look forward to your wisdom.

]i[ona wrote:
Yeah, I see. Strategy for profit. But if take a look on the other side, it could've been the most powerful and popular plug-in in spectrum analysis, which could earn more money than AA that losing popularity to date.
Since Audition's sales figures appear to be rising, not falling, and nobody else seems to be that desperate for another spectrum analyser, I don't see the argument...

Time Frequency Analysis

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