Coefficient série de fourier

Bonjour,
Existe-t-il une solution sous labview pour obtenir les coefficients an et bn de la série de fourier d'un signal ?
La FFT donne la valeur efficace de chaque harmonique mais j'aimerais obtenir les coefficents an et bn.
Merci pour votre réponse.
Cordialement

You can use the “Spectral measurements” express VI. With this VI you choose whether the coefficients are returned in RMS, peak, power spectrum or power spectral density. Also you can choose between linear and dB. I hope this is helpfull.

Similar Messages

Mesures sous formes d'équation

Bonjour,
Je suis en stage et je programme sous LabView.
Cependant j'ai rencontré un problème ces derniers jours! Le but de mon stage est de faire un banc d'essai pour des palmes, programmer avec un LV exécutable, or une fois que j'ai réaliser l'acquisition de mes mesures et afficher la pente de ma droite j'ai besoin d'avoir l'équation sous la forme y(x)=ax+b, par exemple, pour ensuite la dérivée deux fois et obtenir y''(x), soit le moment d'inflection en méanique.
D'ou ma question, Comment écrire une équation qui pourra être dérivé a partir de valeurs sans que l'utilisateur n'est a saisir la pente de la droite ou au pire qu'il doit saisir dans la face avant ?
Car pour l'éditeur d'équation je suis obligé d'écrire à la main l'équation dans le diagramme ce qui est embétant..
Merci d'avance,
Cordialement

Une approximation par un polynôme d'ordre N .... d'accord,
mais une Série de Fourier, si ma mémoire est bonne, cela concerne uniquement les fonctions périodiques.
oops ... tout cela a été étudié ... mais il y a déjà quelques années
heuuu ... personne n'a besoin de la fonction de raisonance d'un circuit LC ? ... ça je sais !

Nota Fiscal Modelo 11A com numeração zerada e série em branco

Prezados,
bom dia!
Estou em uma implementação de SAP onde o cliente continua emitindo Nota Fiscal de Serviço em formulário 1/1A.
Quando na J1B3N gero a saída neste processo a Nota Fiscal não está recebendo o NFNUM e nem a série. Ela aparece na J1BNFDOC porém sem número e série.
Estamos implementando NFe aqui também, mas não para este processo.
Já chequei as seguintes configurações:
Define Nota Fiscal Types
Define Number Groups
Maintain Number Ranges
Assign Numbering and Printing Parameters
Processing Programs
Condition Records
Condition Types
Output Determination Procedure
E a Tabela:
J_1BAA
E mesmo assim não encontrei nada de anormal.
Alguém teria uma sugestão do que pode ser?
Desde já agradeço
Cristina

Cristina,
As transações são relevantes para gerar o número da NF via transação J1B3N. Se todas as configurações estiverem de acordo com a documentação da localização brasileira, nós precisaremos verificar o problema no ambiente. Neste caso,
por favor, envíe chamado para a SAP com os dados relevantes para teste e com a conexão e dados de acesso válidos.
Obrigado
Paulo

Como receber meu número de série para Creative Cloud?

Olá boa tarde a todos, I DON`T SPEAK ENGLISH.
Comprei a Creative Cloud para fotógrafos, dia 30/09/2014. Até hoje, dia 11/11 não recebi um número de série para os produtos Photoshop CC e Lightroom CC. Gostaria de saber como proceder, uma vez que o suporte online é muito confuso, e também não existe suporte via telefone. Também não consigo contato direto com a Digital River do Brasil. No gerenciamento da minha ID Adobe não aparece que eu comprei a Creative Cloud. Mas eu recebi confirmação de compra do [email protected] no mesmo dia em que a compra foi efetuada com cartão de crédito. A cobrança está ok! Mas não tenho o serial number para ativação dos produtos. O que devo fazer? Estou prestes a cancelar minha compra e voltar a utilizar os softwares por meios alternativos. O que seria para facilitar e regularizar meu trabalho profissional na área da faotografgia, acabou se tornando um problema. Agora preciso que alguém me ajude, por favor! Aguardo. Um abraço a todos. Lucas Ferreira. Curitiba-PR / Brasil

Lucas your Creative Cloud membership has not been applied to your account. I would recommend contacting our support team directly at Contact Customer Care regarding the difficulties you are facing with your order.

Validação XML 3.10 (campo série)

Boa tarde pessoal.
Estou com um problema aqui um pouco estranho.
Estamos fazendo a configuração do XML 3.10, e agora está acontecendo um erro.
Durante a chamada da função /XNFE/OUTNFE_CREATE, que cria a nota de saída no GRC, é chamada a função /XNFE/OUTNFE_VALIDATION. Essa função faz a validação dos campos da nf-e de acordo com as regras existentes na tabela /XNFE/XMLVALID.
Quando essa função vai validar o campo SERIE, o mesmo retorna erro na validação.
A expressão regular da expressão é:
0|[1-9]{1}[0-9]{0,2}
O valor da Série é "001".
Teoricamente essa expressão regular permite utilizar esse valor, pois ela permiti ou o literal "0" apenas, ou valores com pelo menos 1 dígito obrigatório de 1 à 9, com até dois dígitos (não obrigatórios) de 0 à 9.
Essa expressão deveria permitir, "1 ", "001", " 01", " 1", etc.
Eu testei a expressão em sites da internet com esta regex, e funcionou perfeitamente.
Testei alterar a expressão (teste em programa Z) para 0|[0-9]{1}[0-9]{0,2}, e ai sim a expressão funcionou. Parece que o ABAP está considerando que é obrigatório que o primeiro campo da série seja diferente de 0.
Att,
Matheus Goulart

Ola Matheus ,
   Tivemos o mesmo problema em um cliente, se você desativar o validador do GRC vai e enviar o xml request (versão 3.10) para SEFAZ de origem você vai ter um erro de falha do xml.
   Verifique no xml da versão 2.0 o valor da tag <serie>. Mesmo enviando para o GRC a serie "001" o valor no xml ficava como <SERIE>1</SERIE>.
   Em resumo: Fizemos fizemos um ajuste na BADI CL_NFE_PRINT no metodo HEADER e retiramos os "zeros a esquerda" da série da nota fiscal e não tivemos mais problemas.
BR
Allan Pizaia

Imprimir Número de série do item na Nota Fiscal - usando o PLD

Boa Tarde.
Estou desenvolvendo um layout de Nota fiscal para itens que possuem garantia, então é necessário que seja impresso, juntamente com a descrição do Item o número de série. Já tentei imprimir o número colocando um field com OSRI:IntrSerial, mas ao invés dele trazer apenas os números de série relacionados na NF, ele tráz todos os números de séries cadastrados no estoque para o item.
Alguém já desenvolveu uma NF com Número de Série em PLD? Poderia por favor me ajudar?
Abraços,
Bruno Cassaro
Edited by: Bruno Cassaro on May 5, 2009 7:16 PM

Oi Bruno
A versão 2007B não tem a tabela do campo de número de séries exposto para o PLD.
Paulo Calado
SAP Business One Forums Team
Edited by: Paulo Calado on Sep 11, 2009 4:35 PM

My iphone 4 is stuck on the reboot logo, ive ried holding both home and power to shut it off snd then keep holding home to let you plug it into itunes but it doesnt work. what do i do?

my iphone 4 is stuck on the reboot logo, ive ried holding both home and power to shut it off snd then keep holding home to let you plug it into itunes but it doesnt work. what do i do?

Did you try rebooting the iPad? You will need to have some battery power for this.
Reboot the iPad by holding down on the sleep and home buttons at the same time for about 10-15 seconds until the Apple Logo appears - ignore the red slider - let go of the buttons.
This may be helpful
iPhone, iPad or iPod touch: Not responding or does not turn on
Frozen or unresponsive iPad - Apple
iPad: Unable to update or restore

How should I set up my VI so that I can use the linear fit coefficient data analysis program, when my values are coming from while loops within a sequence structure?

I'm attempting to create a calibration program, using the printer port, and a Vernier Serial Box by modifying a calibration program designed for the serial box.
There are six calibration points, and to collect them, I have it controlled by while loops so that the numbers are taken when a button is pushed, and this is inside a sequence structure so that I can get the six different points. I feed these numbers into two different arrays (for x and y values) and then try to use the linear coefficient analysis on these points, but the values for the slope and intercepts it returns are not correc
t.
If I cut out the array and coefficient analysis, and feed the same numbers in directly without the while loop and sequence structures, it produces the proper values... I don't know why the numbers it is producing are different, and I'd really like to know.
Thanks,
Karinne.

I would use a data manager sub-vi that would be called by each from of the sequence structure that produced a data point. The data manager sub-vi could auto append new items or could place items in a specific entry of an array. Later on when you want to calculate the linear fit, call the sub-vi to return the array of values.
Stu

Exchange rate coefficient on the basis of latest posting date in invoice.

Hi,
I have one query on posting date(picking of exchange rate coefficient from TCURR table) in invoice verification. Please help.
Conditions are--
vender and company code are not in same currencies(ex-USD and INR). exchange currencies are maintained perfectly on every month 1st ie co-efficients in TCURR table ie OB08
Query---
1.At the time of parking invoice suppose i enter the date 20th august and i have posted that invoice as parking. It is converting the local currency as per 8th month exchange rate.
2.And at the time of final posting the invoice supose i posted that date as 10th September. Business wanted that converting the local currency as per 9th month exchange rate But now local currency is converting on the basis of initial entry of posting date ie 8th month only.
Please advise and guide what configeration that i have to set for picking the exchange rate coefficient on the basis of latest posting date in invoice verification.
Thanks & Regards,
MadhuBabu.

Hi
I dont think it is possible as once you enter posting date while in parking invoice screen, on that date exchange rate will be calculated and it wil not be different at time of posting invoice. Instead of parking, you have to directly post with current posting period.
Thanks

Numéro de série Adobe Photoshop CS6 Extended avec le CD dans une boite carton.

je viens de recevoir CS6 dans sa boite, impossible de trouver le numéro de série!! merci de votre aide

Comment faire, alors ?
Puis-je réinstaller une CS3 avec le numéro de série d'origine et considérer qu'ayant acquis une CS4, je suis en règle ?
Je n'ai pas l'intention d'acquérir une mise à jour pour mes deux autres licences (besoin non avéré).
Dois-je considérer qu'il vaut mieux changer d'outil car adobe ne permet pas le downgrade ?
Merci.

éventement PinChanged port série

Hello,
My project is to establish a communication interface between my pc and motion control (MCS 32EX SERAD) via a serial port.
I realized the interface with C #, for testing the communication I used a Hyper terminal and it works for now I can send and receive data, but when I try them with motion control that does not work, I not connect. So I thought may be so at the port configuration
(leds RTS, CTS, DSR, XonXoffOut, XonXoffIn)
Can you explain the Pinchangerd event with a short code, I end search google but I do not really understand ?????
sorry for my english
here is my code:
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.IO.Ports;
using System.IO;
using System.Threading;
namespace Communicatio_1
public partial class Form1 : Form
public byte[] bBufferBytes; //buffer a envoyer
public delegate void myDelegate(byte sData);
//public event SerialDataReceivedEventHandler DataReceived;
public enum LogMsgType { Incoming, Outgoing, Normal, Warning, Error };
public bool RtsEnable { get; set; }
public Form1()
InitializeComponent();
this.Refresh();
private void Form1_Load(object sender, EventArgs e) //l'événement Form_Load nous lire tous les ports série disponibles et nous assigner les valeurs à la liste déroulante.
//on commence par lister les voies séries présentes
String[] ports = SerialPort.GetPortNames(); //fonction statique
//string [] ports = System.IO.Ports.SerialPort.GetPortNames ();
for (int i = 0; i < ports.Length; i++) //on ajoute les ports au combo box
portBox.Items.Add(ports[i]);
private void button_charger_Click(object sender, EventArgs e)
openFileDialog1.Title = "Chargement";// Titre
openFileDialog1.FilterIndex = 1;
if (openFileDialog1.ShowDialog(this) == DialogResult.OK) // Ouverture boite de dialogue OpenFile
textBox1.Text = string.Empty; // On vide le TextBox
backgroundWorker1.RunWorkerAsync();// executer le Background worker doWork()
// timer1.Start();
StreamReader sr = new StreamReader(openFileDialog1.OpenFile(), Encoding.Default); // Ouverture du fichier sélectionné
// son nom est dans openFileDialog1.FileName
private void button_connecter_Click(object sender, EventArgs e)
serialPort1.PortName = portBox.SelectedItem.ToString();
serialPort1.BaudRate = 9600;
serialPort1.Parity = Parity.None;
serialPort1.StopBits = StopBits.One;
serialPort1.DataBits = 8;
serialPort1.Handshake = Handshake.None;
serialPort1.PortName = portBox.Text;
serialPort1.RtsEnable = true;
serialPort1.DtrEnable = true;
// serialPort1.Open();
serialPort1.DataReceived += new SerialDataReceivedEventHandler(serialPort1_DataReceived);
try
serialPort1.Open(); //Ouvrez le SerialPort
StatusLabel1.Text = "serialPort1 : " + portBox.Text + " Opened";//Mettre à jour le StatusStrip
MessageBox.Show("Opened");
catch (Exception ex)
MessageBox.Show("Failed: " + ex.Message);
button_connecter.Enabled = false;
button_deconnecter.Enabled = true;
textBox1.ReadOnly = false;
textBox2.ReadOnly = false;
radioButton.Enabled = true;
radioButton.BackColor = Color.Black;
private void button_deconnecter_Click(object sender, EventArgs e)
try
serialPort1.Close(); //fermer le SerialPort
StatusLabel1.Text = "serialPort1 : " + portBox.Text + " Closed"; //Mettre à jour le StatusStrip
MessageBox.Show("Closed");
catch (Exception ex)
MessageBox.Show("Failed: " + ex.Message);
button_connecter.Enabled = true; // activer le button connecter
button_deconnecter.Enabled = false;// desctiver le bitton deconnecter
textBox1.ReadOnly = true;
textBox2.ReadOnly = true;
radioButton.BackColor = Color.White;
private void button_recevoir_Click(object sender, EventArgs e)
StatusLabel1.Text = "Appuyez sur 'F6' de la commande numérique puis patientez...";
textBox2.SelectedText = string.Empty;
//textBox2.AppendText(DataReceived.ToString());
private void serialPort1_DataReceived(object sender, SerialDataReceivedEventArgs e)
//string vide
string value = "";
//tant qu'il y a des données entrée on continue
while (serialPort1.BytesToRead > 0)
// on crée un char de 255 caractere
char[] buffer = new char[255];
//lecture du buffer jusqu'a sa longeur buffer.Length
int longueur_bytes_read = serialPort1.Read(buffer, 0, buffer.Length);
//tes characteres sont contenus dans buffer.
//on remplit notre string value byte par byte par notre tableau de charactere buffer, le += fait que l'on écrase pas les données qui sont inserées, mais on les ajoutes.
for (int i = 0; i < longueur_bytes_read; i++)
value += buffer[i];
//la methode toString passe tes bytes en characteres lisibles.
safeInput(value.ToString());
private void safeInput(string msg)
MethodInvoker method = delegate
// on efface la textbox
textBox2.SelectedText = string.Empty;
// on met les données dedans en string (conversion char->string)
textBox2.AppendText(msg.ToString());
if (InvokeRequired)
BeginInvoke(method);
else
method.Invoke();
private void button_envoyer_Click(object sender, EventArgs e)
StatusLabel1.Text = "Appuyez sur 'F6' de la commande numérique puis patientez...";
// serialPort1.Write(bBufferBytes, 0, bBufferBytes.Length);
// serialPort1.WriteLine("");
StreamReader sr = new StreamReader(openFileDialog1.OpenFile(), Encoding.Default);
try
string data = sr.ReadLine();
// bBufferBytes = System.Text.Encoding.ASCII.GetBytes(data); //Place le contenu dans un buffer d'octets (ASCII: 1 char = 1 octet) (UNICODE: 1 Char = 2 octets)
while (data != null)
bBufferBytes = System.Text.Encoding.ASCII.GetBytes(data); //Place le contenu dans un buffer d'octets (ASCII: 1 char = 1 octet) (UNICODE: 1 Char = 2 octets)
textBox1.AppendText(data + "\r\n");
data = sr.ReadLine();
serialPort1.Write(bBufferBytes, 0, bBufferBytes.Length); // Ecrit le buffer complet sur le SerialPort
StatusLabel1.Text = "Transfert en cours...";
finally
if (sr != null)
sr.Close();
StatusLabel1.Text = "Transfert Fini ";
private void backgroundWorker1_DoWork(object sender, DoWorkEventArgs e)
for (int i = 0; i <= 100; i++ )
backgroundWorker1.ReportProgress(i);
System.Threading.Thread.Sleep(100);
private void backgroundWorker1_ProgressChanged(object sender, ProgressChangedEventArgs e)
progressBar2.Value = e.ProgressPercentage;
StatusLabel1.Text = e.ProgressPercentage.ToString()+ "%" + "Télechargement en court...";
private void backgroundWorker1_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
StatusLabel1.Text = ("Télechargement Fini");

Je ai ajouté ce morceau de code, mais il ne fonctionne pas
private void serialPort1_PinChanged (object sender, SerialPinChangedEventArgs e){if (e.EventType == SerialPinChange.Break){serialPort1.BreakState = serialPort1.BreakState;}else if (e.EventType == SerialPinChange.CDChanged){}else if (e.EventType == SerialPinChange.CtsChanged){}else if (e.EventType == SerialPinChange.DsrChanged){}else if (e.EventType == SerialPinChange.Ring){
et l'initialisation:
serialPort1.PinChanged + = new SerialPinChangedEventHandler (serialPort1_PinChanged);
Help me

Why not use Fourier transforms for filtering?

Are there any resources for constructing filters using discrete Fourier transforms (DFTs)? Or is it as easy as it seems. For example, for lowpass filtering I obtain the DFT of my signal, zero out components above the selected cutoff frequency and then transform back to get my signal minus the high frequency (noise) components. It seems to behave correctly for the signal I've applied it to, but am I missing something. Upsides would appear to be (1) no time delay between the input and output and (2) the filter is sharp with no transition band. Downside is that this method is slower than using impulse filters, but are there other upsides, downsides, or considerations I'm missing?

The technique of filtering using frequency domain truncation and IFFT is used in specific areas where computation time is essential (to avoid the time domain convolution with a long impulse response), like image processing. However the technique also has some downsides you should be aware of.
The frequency domain filtering performed on a data record is totally equivalent to a circular convolution made on your time signal with the impulse response of your ideal low-pass filter (typically a sin(x)/x function). The fact what we are doing a circular convolution will result in unwanted artifacts and you'll see some "parts" of the beginning of your signal at the end of the filtered signal and vice-versa.
Try for example to create a short signal (like a sharp pul
se) and extend it with zeros. After filtering you will see a sort of "pre-shoot" of your original signal at the very end of your signal. If you then rotate your time signal you'll discover that the signal is actually continuous (in a circular way).
You can reduce the problem by, for example, adding "some" zeros at the beginning and at the end of your signal (zero-pad) before your filtering operation (before the FFT) and then remove these additional samples again from you filtered signal (after the IFFT).

How to create fourier transform properties using labview

Hi everyone
i am a new user to Labview and i only have 2 weeks left to complete an assignment.
This assignment involves the implementation of the various types of fourier transform properties using Labview. These properties include linearity, time shifting, frequency shifting, time scaling,
I do not really know how to implement them using Labview
PLS HELP!!!
Thanks

i am refering to the fourier transform properties listed below:
A) time shifting
x(t-a) ------- > exp (-jwa) X(w)
For the time shifting property above, i have problem creating the exponential term using labview
B) time scaling
x(at)-----------> 1/a X (w/a)
C) Time convolution
Y(w) = F[h(t) * x(t)] = H(w)X(w)
where * stands for the convolution operation and F stands for fourier transform
Please provide diagrams if possible. Thank you
PLEASE HELP!!!!!!!! THANKS!!!!!!!

Enregistrer 2 ports série en même temps LV 8.5

Bonjour à tous,
j' aimerais enregistrer les données de 2 ports série en même temps en utilisant NI VISA, après des recherches je pense qu'une boucle producteur/consommateur serait le bon choix mais je suis débutant en labview et je ne comprend pas comment marche le système de file d'attente, ni qui doit être producteur (est ce qu'il faut 2 boucles en parallèle qui lisent chacune un port série différent et le consommateur est une boucle qui traite et enregistre le tout ?)
Quelqu'un pourrait il m'aider à débuter ce programme, merci pour tout.

Un exemple sur le COM1 (paramètre).
Luc Desruelle | Voir mon profil | LabVIEW Code & blog
Co-auteur livre LabVIEW : Programmation et applications
CLA : Certified LabVIEW Architect / Certifié Architecte LabVIEW
CLD : Certified LabVIEW Developer / Certifié Développeur LabVIEW
Pièces jointes :
VISA Read.vi ‏77 KB

Labview : Communication série avec un périphérique

Bonjour,
Sous Labview, j'essaie de communiquer via un port série à un périphérique. En parallèle, j'essaie de recevoir et d'envoyer des données. Je voudrais me placer en mode écoute (Activer la réception sur ce port : Visa read) puis envoyer une commande (Visa write). De ce fait, en se plaçant en écoute avant l'envoie de la commande, je suis sûr de recevoir la réponse du périphérique.
Je veux donc envoyer un caractère tout en écoutant sur le même port com la réponse de mon périphérique (J'ai déjà un doute à ce sujet. Avec un port série, on peut lire et écrire en même temps ? )
Mon problème est le suivant : En lançant ce programme sous Labview, il se place en écoute mais n'envoie pas le caractère de commande (montage en parallèle). Après le timeout de l'écoute (Visa read), le programme écrit bien le caractère (Visa write) comme un fontionnement série.
Comment réaliser des tâches multiples en parallèle sur LabView ? Auriez-vous un exemple ou plus d'information à ce sujet ?
Merci,
Jérémy

Bonjour,
je confirme le fait qu'un UART ne peut pas travailler en "parallèle".
Pour dialoguer avec un équipement, il faut envoyer une commande "Write" si besoin, pour que le produit te réponde.
Tu récupères ensuite la réponse avec un "Read".
Pour dimensionner le nombre de données à lire, plusieurs méthodes par la suite se présente à toi.
- Attendre un certain temps : Interruption de la lecture sur timeout
- Attendre un caractère de terminaison \A : 0xD par défaut.
- Lire un certain nombre d'octet : Utilisation du noeud de propriétés nbre de bytes sur la liaison fortmeent conseillé.
Si après une manipulation simple, tu ne relies pas de données, n'hésites pas à mettre une temporisation de 100 ms entre ta requête et ton écoute, il n'est pas rare d'avoir des équipements avec un temps de réponse de l'ordre de 50ms sur port série (spécification présente dans la documentation de l'équipement en général).
Bonne journée,
Michael

Coefficient série de fourier

Similar Messages

Maybe you are looking for