Determining spectral density of poisson process (carson theorem)

Has anyone ever determined code for working out the spectral density (or
equivalent) of a Poisson process, based on Carson theorem (or a variant
thereof)? It doesn't have to be in Labview, but that would be the easiest (or VB).Message Edited by Jo on 05-01-2005 11:34 PM

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Power Spectral Density.vi

Can someone tell me what the parameter "ENBW" stands for and what it really means in Window Parameters.vi (in Scaled Time Window.vi) (used for Power Spectral Density.vi). See attached.
Is it "envelope bandwidth?" I checked some of my signal processing books but came up with no definite answer.
Thanks,
Don
Attachments:
enbw.png ‏283 KB

It's the equivalent noise bandwidth of the window.
From the help file (LV8) on Scaled Time Domain Window:
"You can use eq noise BW to divide a sum of individual power
spectra or to compute the power in a given frequency span. "
and more from:
Scaling Smoothing Windows
Applying a smoothing window to a time-domain signal multiplies the
time-domain signal by the length of the smoothing window and introduces
distortion effects due to the smoothing window. The smoothing window changes the
overall amplitude of the signal. When applying multiple smoothing windows to the
same signal, scaling each smoothing window by dividing the windowed array by the
coherent gain of the window results in each window yielding the same spectrum
amplitude result within the accuracy constraints of the window. The following
plots are the result of applying scaled smoothing windows to the time-domain
signal.
An FFT is equivalent to a set of parallel filters with each filter
having a bandwidth equal to Δf. Because of the spreading effect of a
smoothing window, the smoothing window increases the effective bandwidth of an
FFT bin by an amount known as the equivalent noise-power bandwidth (ENBW) of the smoothing
window. The power of a given frequency peak equals the sum of the adjacent
frequency bins around the peak increased by a scaling factor equal to the ENBW of the smoothing
window. You must take the scaling factor into account when you perform
computations based on the power
spectrum.
The table below lists the scaling factor, also known as coherent
gain, the ENBW, and
the worst-case peak amplitude accuracy caused by off-center components for
several popular smoothing windows.
Window
Scaling Factor (Coherent Gain)
ENBW
Worst-Case Amplitude Error (dB)
Uniform (none)
1.00
1.00
3.92
Hanning
0.50
1.50
1.42
Hamming
0.54
1.36
1.75
Blackman-Harris
0.42
1.71
1.13
Exact Blackman
0.43
1.69
1.15
Blackman
0.42
1.73
1.10
Flat Top
0.22
3.77
<0.01
Here's another discussion on it:
http://forums.ni.com/ni/board/message?board.id=230&message.id=2637&requireLogin=False
Message Edited by Jonnie 5 on 04-06-2006 10:55 AM
2006 Ultimate LabVIEW G-eek.

Power spectral density

Hello,
I cannot seem to change the "desired units" of the SVT Power Spectral Density.vi in the sound and vibration toolkit. It is still possible to switch between EU^2/Hz and EU/sqrt(Hz) on the Power Spectral Density function?
Regards,
Raoul Enning

Hello Beat,
thanks for your help in this matter, I really do appreciate it. First and foremost let me mention that I am working with SVT version 3.1- maybe quite antiquated; i un- and reinstalled it just to make sure that no one here in my lab had fooled with it. On that note, my spectrum units.vi looks somewhat different to yours (see attachment). The relevant portion of the naming of the y-axis variables comes in the "svl_Modify Unit Label for Spectrum Type and Spectral Density.vi". If we look in this VI (also attached) we see that the larger outer conditional, which defines if the units are X^2 / Hz or X / sqrt(Hz), has itself a condition that only allows free movement when the input is linear. When the input is in dB, the conditional is always false, which amounts to forced labeling the Y-axis with X / sqrt(Hz). I actually see the same conditional in the VI you posted.
In addition to this, the data doesnt change either. This is because of the sv_Linear to dB.vi (also in attachment). when switching between EU^2/Hz and EU/sqrt(Hz), the "input signal" data switches between either 1 set of data, or that same set of data squared. so far so good. However, the calculation that is done here when EU/sqrt(Hz) is selected (i.e. magnitude) is 20log(Vin/Vref) which is equivalen to 10log(Vin^2/Vref^2). So, this returns us to power and not magnitude, converting the data right back to how it is when EU^2/Hz. Now I can imagine that programmers have done this to maintain the definition of the dB in electrical engineering, but I will argue that when I select EU/sqrt(Hz) (this cannot be called power spectral density anymore) I want the units in Volts, and not in Volts squared.
Regardless of the semantics of the data computation, the units reported on the y-axis are always wrong when dB is active. Following the computation of the data in sv_Linear to dB.vi, they should always be EU^2/Hz, and not the other way around.
In order to fix this, I am compelled to convert the 20log(Vin/Vref) computation to 10log(Vin/Vref) and to remove the "linear" condition in the svl_Modify Unit Label for Spectrum Type and Spectral Density.vi.
What do you think of this idea? Am I completely wrong in my thoughts?
Regards,
Raoul Enning
Attachments:
spectrum units.JPG ‏67 KB
unit label.JPG ‏77 KB
Linear to dB.JPG ‏120 KB

Cross power spectral density

Hello
I can not figure out how to use "Cross Power Spectral Density" (CPSD)
in Labview. I know that Labview has something about
"Cross Power Spectrum" but I need Cross Power Spectral
Density, because I am going to measure the coherence which
needs CPSD as far as I know.
Thaks for your help.

The following example code should be helpful. Please take a look, thanks!
Analyzing Two Input Signals Using the Cross Power Spectrum VI

Warning message during batch determination while doing GR for process order

Hi Experts,
During delivery against process order for all SFGs and FGs, we are getting warning message u201CInvalid batch according to selection criteria in batch determinationu201D.
Following settings maintained for batch determination in process order.
Condition table for order/material type maintained
Access sequence maintained for order/material type
In strategy type above access sequence has been maintained. The common class and sort sequence created for all materials in the plant have also been assigned to this strategy type. In batch split changes allowed box has been checked and quantity proposal maintained as 1.
In search procedure control maintained for order/material type. Search procedure has been assigned to all process order types and check activated.
In spite of the above when GR for order is taking place , system is throwing warning message.
GI of components is being done through backflush and without any warning message.
Please advise how to ensure proper batch determination during GR against order.
Regards
Sm.

Issue resolved by removing required indicators from characteristics which were not being valuated but were maintained in the class assigned to SFGs/FGs.
Regards
Sm.

Leg determination in in import purchase process

Hello freinds,
Scenario: I want to capture the shipment costs for import purchases. Suppose i want to capture freight costs from foreign vendor plant to foreign Port(leg1) from Foreign port to indian port(leg 2) and indian port to plant(leg3).
How to map it in single route?
Can system determine the route automatically in Purchase process(In Inbound delivery) If it possible how it is?
After that, if we capture shipment costs of all three legs, how system will copy to delivery costs after GR.
At present we are capturing the shipment costs for domestic purchases(all are direct legs), We used one condition type in PO for copying the ship.costs to material costs.
Now i think we have to maintain more than one condition type in PO for carying the different costs.
The transporter are different in three legs.
With regards
Lakshmikanth

Hi Lakki,
I am looking for the same solution
kindly help if u have done with.

Batch determination for raw materials in process order

I have defined a sort rule, batch search strategy and assiigned this strategy to process order type.classification for batch is also defined with charecterstic mentioned in sort rule.But when i am doing BD for raw materials in Process order , it is barnching into some other screen saying, no selection criteria and no strategy info defined. what are the necessary settings to make BD possible for all the materials having batch management.

Hi
Config Setting In Batch Management
This will help you for config setting:
Logistics general - Batch Management
1.1. Specify Batch Level
Menu Path Enterprise Structure> Logistics General> Batch Management --> Specify batch level and activate batch status management Transaction OMCT
1.2. Batch Number - Activate Internal Number Assignment
Menu Path Enterprise Structure> Logistics General> Batch Management --> Batch Number Assignment --> Activate internal batch number assignment Transaction OMCZ
1.3. Batch Creation - for Goods Movements
Menu Path Enterprise Structure> Logistics General> Batch Management --> Creation of new batches --> Define batch creation for goods movements Transaction
1.4. Characteristic Value Assignment -- Update Standard Characteristics
Menu Path Enterprise Structure> Logistics General> Batch Management --> Characteristic Value Assignment --> Update Standard Characteristics Transaction
1.5. Activate Batch Classification for Goods Movements in Inventory Management
Menu Path Enterprise Structure> Logistics General> Batch Management --> Characteristic Value Assignment --> Valuation for goods movements --> Activate Batch Classification for goods movements in Inventory Management Transaction OMCV
1.6. Batch Determination u2013 Condition Table(Cross Client)
Menu Path Enterprise Structure> Logistics General> Batch Management --> Batch Determination & Batch Check --> Condition Tables --> Define production order condition tables Transaction OPLB
1.7. Batch Determination u2013 Condition Table(Cross Client)
Menu Path Enterprise Structure> Logistics General> Batch Management --> Batch Determination & Batch Check --> Condition Tables --> Define SD condition Tables Transaction V/C7
1.8. Batch Determination u2013 Access Sequence(Cross Client)
Menu Path Enterprise Structure> Logistics General> Batch Management --> Batch Determination & Batch Check --> Access Sequences --> Define Production Order Access Sequences Transaction OPLF
1.9. Batch Determination u2013 Access Sequence(Cross Client)
Menu Path Enterprise Structure> Logistics General> Batch Management --> Batch Determination & Batch Check --> Access Sequences --> Define SD Access Sequences Transaction V/C2
1.10. Batch Determination u2013 Strategy Types
Menu Path Enterprise Structure> Logistics General> Batch Management --> Batch Determination & Batch Check --> Define Production Order Strategy Types Transaction OPLE
1.11. Batch Determination u2013 Strategy Types
Menu Path Enterprise Structure> Logistics General> Batch Management --> Batch Determination & Batch Check --> Define SD Strategy Types Transaction V/C1
1.12. Batch Determination u2013 Batch Search Procedure
Menu Path Enterprise Structure> Logistics General> Batch Management --> Batch Determination & Batch Check --> Define IM   Search Procedure Transaction OMCY
1.13. Batch Determination u2013 Batch Search Procedure
Menu Path Enterprise Structure> Logistics General> Batch Management --> Batch Determination & Batch Check --> Define Production order Search Procedure Transaction OPLG
1.14. Batch Determination u2013 Batch Search Procedure
Menu Path Enterprise Structure> Logistics General> Batch Management --> Batch Determination & Batch Check --> Define SD Search Procedure Transaction V/C3
1.15. Batch Determination u2013 Batch Search Procedure Allocation
Menu Path Enterprise Structure> Logistics General> Batch Management --> Batch Determination & Batch Check --> Allocate IM search procedure/activate check Transaction OMCG
1.16. Batch Determination u2013 Batch Search Procedure Allocation
Menu Path Enterprise Structure> Logistics General> Batch Management --> Batch Determination & Batch Check --> Assign Search procedure to production order Transaction OPL8
1.17. Batch Determination u2013 Batch Search Procedure Allocation(SD)
Menu Path Enterprise Structure> Logistics General> Batch Management --> Batch Determination & Batch Check --> Allocate SD Search procedure Transaction V/C5
1.18. Batch Determination u2013 Activate Automatic Batch Determination(SD)
Menu Path Enterprise Structure> Logistics General> Batch Management --> Batch Determination & Batch Check --> Activate Automatic Batch Determination in SD -->For delivery item categories Transaction V/CL
1.19. Batch Determination u2013 Batch Selection Class
Menu Path Enterprise Structure> Logistics General> Batch Management --> Batch Determination & Batch Check --> Define Selection Classes Transaction CL01
1.20. Batch Determination u2013 Sort Rule
Menu Path Enterprise Structure> Logistics General> Batch Management --> Batch Determination & Batch Check --> Define Sort Rules Transaction CU70
1.21.   Batch Determination u2013 Make Settings for Batch Where-used list
Menu Path Enterprise Structure> Logistics General> Batch Management --> Make Settings for Batch Where-used list Transaction OMBB
regards
Faisal

How to determine from PL/SQL which processes are running

Hi,
I would like to find out which processes are runing. Is there any way how to determine this directly from PL/SQL? I know I can run external C libraries, but if there is another way, that would be great.
Thanks for help, Dan

Rahul India wrote:
YOu might want to check these
http://www.dba-oracle.com/plsql/t_plsql_v$.htm
http://www.dba-oracle.com/t_plsql_monitoring.htm
Please DO NOT post links to commercial websites. It is a breach of the Terms of Use of the forums.
Such websites tend to provide snippits or excerpts of information in order to try and get people to purchase their products (books or whatever) or services.
There are plenty of good resources out there, including the Oracle documentation, other threads on these forums with similar questions and solutions, or expert's blogs or websites that are not trying to sell something.

Plot Power spectral density of a signal from myDAQ.

Hello,
I need to plot the power spectrum of a signal acquired using myDAQ. I have already been able to acquire and plot the input signal. The example given in Labview for power spectrum uses a pre-defined sine wave and replacing the sine wave by the input signal does not get the work done..
Please Help...
Thanks
Solved!
Go to Solution.
Attachments:
example psd.vi ‏117 KB

Why have the second loop? Looks like you should have what you want with just the first loop. Here's a cleaned up version of your code. I only removed the second loop and then did some slight rearranging to make it easier to read.
There are only two ways to tell somebody thanks: Kudos and Marked Solutions
Unofficial Forum Rules and Guidelines
Attachments:
example psd.zip ‏70 KB

Recording data for power spectral density

Hello
I need to record the power spectrum for a duration of 2 weeks for 2 hours per day. I can get the averaged power spectrum for the 2 hour duration per day as it is embedded in the Power Spectrum Function. Is there a possiblity of saving the data to some Excel file and later calculating the averaged power spectrum for the whole 2-week duration..
Please Help. Thank you.

I was save the data into a TDMS file. The API is fairly simple and there is a free add on to view the data in Excel.
You can later also read the TDMS file and do whatever averaging, etc you want to do with the data.
There are only two ways to tell somebody thanks: Kudos and Marked Solutions
Unofficial Forum Rules and Guidelines

Batch Determination in Process Order Creation - COR1

Hi All
I have a requirement wherein i have to map the standard sap methodology of batch determination that happens in a process order. Currently, in the tcode COR1, whenever a user selects a component material and triggers batch determination, sap determines a list of eligible batches based on the search strategy & condition records
defined in the config.
What i want to know is that whether this list of batches can be generated in a custom program, using some standard FM, BAPI etc? or if i have to manually implement the logic, how to go about incorporating the search strategy & condition records in the logic.
Any pointers will be appreciated.
Regards
Ravish Garg

HI Madhuri
It is not directly possible to use this FM to to evaluate all new batches and compare the Batch results with the batch search strategy.
To be able to use this FM properly, its necessary to pass the correct structures to its importing parameters, which can be determined using 2-3 FM's before this and fetching data from the standard tables.
Cheers
Ravish

Intercompany invoice not getting created in third party processing

Dear Gurus !
I am facing a problem in creating the intercompany invoice in case of third party order processing.
In our organisation , for any type of sale two billing documents are creared :
1) Commercial Invoice under the co. code for which sales org. is maintained at the sales order bookin level .
2) Intercompany Invoice under the co. code in which plant is maintained which is used at the sales order level as delivering plant.
So, as per the configuration req. for third party processing , i have created Sales order ( with automatic Purchase requistion generated ) , Purchase order creation with reference to the Purchase requisition , goods reciept ( MIGO ) and invoice reciept ( MIRO ) , then billing doc. or commercial invoice ( VF01 ) with the generation of accounting document and finally the intercompany invoice ( VF01 ) .
But i am facing the problem in final stage , that is , intercompany invoice creation .
Error Message : No open billing quantity has been determined .
I have checked the copy control for sales order to intercompany invoice and still not able to resolve it .
Please reply which setting needs to be done for this .
Awaiting your response , that what copy control settings is required .
Thanks .....

Hi Buddi / Mahesh / Kiran ,
It ' s good to see all of your opinion . But my problem has not been resolved .
I am implementing third party processing in my organisation , where the customer is an export customer ( outside India ) . Hence , this is a merchant export .
All the configurations / Customisations have been done for this process .
The process is running fine till commercial invoice , but the problem is in intercompany billing doc. creation.
I am again repeating - Error message : No open billing quantity has been determined.
Explanation of the process :
1) The order has been booked with item category TAS alongwith the item cat. group as BANS for the material used in the order .
2) The sales area is 1020 / 30 / 35 . Here , 1020 is sales org . under company code 0079 , 30 is export's distribution channel and 35 is the division for components .
3) The delivering plant used in the sales order is 1009 which is under co. code 0077. The price / condition record maintained for this material is in USD / EUR as it is a case of merchant export .
4) The purchase requisition is generated automatically when the order is saved . It can be seen at VA02 - > Item details - > Schedule Lines .
5) With the help of this PR no. , i have created a purchase order for vendor which is maintained under co. code 0077 asking for material in plant 1009 which we need to export / supply to the customer.
6) The value of material per piece in the P.O. is coming from the material master record -> Accounting 1 view - > Moving av. Price .
7) Now, the Purchase order is saved . With the help of this P.O. no. , goods reciept ( MIGO )is done .
8) After MIGO , Invoice reciept or MIRO is done under company code 0077.
9) After MIRO , customer ' s invoice is created through VF01 .
Remember : This is an order relevant billing , no delivery or PGI will happen here because the material is not coming into the plant 1009 .
10)The billing document ( order - related billing doc.) is created and the accounting document is also created under co. code 0079 in USD .
Till this stage , everything is running successfully as per business requirement , but i am facing the problem in the final stage , that is creation of intercompany invoice under co. code 0077 which is in INR .
In all other sales document types used in our industry , the process is same , that is : a) Sales order creation b) Delivery and PGI c) Billing doc. creation with accounting doc. under co. code 0079 and finally d) Intercompany invoice with accounting doc. under co. code 0077 and excise invoice creation with reference to intercompany invoice.
In the above, problem is not there becuase orde is delivery relevant , hence copy control is maintained for interco. billing to delivery type.
But in the new process , that is , third party processing , sales order relevant billing is done . so i suppose there will be a copy control for intercompany billing and sales doc. type , but i am not able to resolve it .
Hence , please understand the process before suggesting .
Thanks and awaits reply........

Account determination analysis in sales order

Hi there,
in a sales order processing (VA02/VA03) I'd like to know which accounts will be determined prior to invoincing it.
I find the "account determination analysis" tool through the menù path: "Environment" -> "Analysis" -> "Account Determination" (FCODE = 'KTPR'), but it shows an empty screen
The same tool shows the desired data during an invoice processing (VF02/VF03).
How can do to see the account determination analysis in sales order processing, and not in invoice processing ?
This tool shows an empty screen even if the order is invoiced, or not.
So I'm asking: which is the meaning of this tool inside sales order processing ?
Hope I've explained correctly my problem.
Thanks in advance.
Andrea

Hi Nagaraj,
the sales order amount is > 0, but the account determination analysis tool still show me an empty screen
It seems this tool runs only into invoice processing.
I try to follow the ABAP debugger and at a certain point it uses the "account determination procedure" (KOFI00), that in the sales order is missing ... maybe this is the problem ...
Best regards
Andrea

No receiver found in Receiver Determination

Hello Experts,
Sub: Calling integration process (which in software component1) from sender service interface_Out (which is in another software component2) in Receiver Determination Fails.
       There are two software components, S/W C1, S/W C2,
        In S/W C1,->
        Integration process (IP1)created in S/W C1, with name space NS1,
        Service interface1(abstract) SI1 with message type MT
        In S/W C2,->
        Sender service interface2 SI2(outbound) with message type MT with namespace: NS2
(MT message type, in both service interface holding the same,
used SI1 In receive step in IP1.
Interface Determination from BS2,SI2,NS2<->   IP1,SI1(No mapping).)
In Receiver Determination,
Business system BS2;
Sender Service Interface: SI2;
Name space: NS2,
In Receivers : IP1
Problem is : do not find this receiver.
I have to call this process, like this. Please help on this.
Use case is:
single Soap request is coming, many application are using the same using common Receiver determination( which in S/W C2),
Now i have to use the same receiver determination to send this message in IP1 which is in SW C1;
-> any alternative solutions for this
Thanks,
Deviprasad.

hi,
when you use Integration Process the configuration in the ID must be
Receiver Determination 1:
Sender System: XXX
Enterprice Services (outbound)
Namespaces
Target System: Integration Processes
No Mapping requiered in Interface Determination
Line:
Receiver Determination 2::
Sender System: Integration Process
Enterprice Services (Abstract)
Namespace
Target System: YYYY
No Mapping requiered in Interface Determination
Sender Agreement=1
Receiver Agreement=2
Interface Determination=2
Communication Channels=2
Take in mind that in the Interface determination you have to define as receiver structure the Service Interface (Enterprice Service in PI7.1) type Abstract. if you cant select it delete all filter in the popup qhen you have to select the Inteface in the reciver structure.
Check the Integration PRocess if you define the SI_XXX_abs in the reciver step.
check all changes in the ESR were activated
Check this out and let me know
Edited by: Rodrigo Alejandro Pertierra on Sep 3, 2010 2:42 PM

Word processing within a text component

Although this is a potentially great application, I am at present prevented from using it to create a website due to the lack, as far as I can determine, of any form of processing individual text within the text components e.g. making individual words or word groups bold or italic or giving them COLORS.
I have large informatory text areas on my pages which need this sort of processing in order to avoid client eyestrain as well as my own.
Of course one can get around this to some extent by using multiple components but for long texts this quickly becomes very tedious and error prone, especially if one wants to copy from another source.
The Static Text component, which I presume is meant for this sort of text, in it's present simple form allows word wrap but no line formatting. The basic Text Area component (multiple lines) has no word wrap but does allow line formatting. However when one sets the Read Only property, it seems that any self created line formatting is duly destroyed. This is strangely not the case with the old Standard Mutliline Text Area component.
I may be missing something but if not I hope that these features may yet be incorporated.
Regards,
Dave

You can use static text to render pure HTML, just set "escape" property to false.
Note that the HTML text must be well former.
Regards.

Determining spectral density of poisson process (carson theorem)

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