Get the minimum frequency of three signals FFT

Similar Questions

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  Hello

  I'm trying to calculate the median frequency of a simple sEMG signal through a standard DAQ VI in LabVIEW without using the tool of biomedical research, but I'm unable to know where to start with a power spectrum. Any tips?

  Thank you

  
  

• What is the best way to get the minimum or maximum of a table of numbers value?

  Let's say I have a table of numbers: [2,3,3,4,2,2,5,6,7,2]
  
  What is the best way to find the minimum or maximum value in the table?
  
  Now, just get the maximum, I'm a loop in the table and reset a variable to the value if it is greater than the existing value:
  

  What I ended up doing was sorting table (descending to MAX) upward for MIN and then grabbing the first element of the array. Works like a charm in very few lines of code.

  Thank you.

• How can I get the minimum of a paricular data field?

  Hi all

  I used directly as a minimum of data below field.

  But the result is false.

  How do I get there?

  <? xdoxslt:minimum (VOUCHER_ID)? >

  Thanks in advance

  during the insertion of the field dialog box make sure that the mode of calculation is selected as Minimum.

  Thank you

  ~ KKT ~.

• Get the minimum and maximum values

  Hi all
  
  Please, how can I solve the problem below.
  

  WITH DT1 AS
  (
  SELECT 'A' ID,  3 MIN_VAL FROM DUAL UNION ALL
  SELECT 'B' ID, 25 MIN_VAL FROM DUAL UNION ALL
  SELECT 'C' ID, 55 MIN_VAL FROM DUAL
  ),
  DT2 AS
  (
  SELECT 21 MAX_VAL FROM DUAL UNION ALL
  SELECT 37 MAX_VAL FROM DUAL UNION ALL
  SELECT 41 MAX_VAL FROM DUAL UNION ALL
  SELECT 51 MAX_VAL FROM DUAL UNION ALL
  SELECT 67 MAX_VAL FROM DUAL UNION ALL
  SELECT 76 MAX_VAL FROM DUAL
  )
  SELECT ID
       , MIN_VAL
       , MAX_VAL
    FROM DT1
       , DT2

  expected result
  --------------------
  ID  MIN_VAL  MAX_VAL
  A         3       21
  B        25       51
  C        55       76

  Kind regards

  Using the analytical function LEAD:

  SQL> WITH DT1 AS
    2  (
    3  SELECT 'A' ID,  3 MIN_VAL FROM DUAL UNION ALL
    4  SELECT 'B' ID, 25 MIN_VAL FROM DUAL UNION ALL
    5  SELECT 'C' ID, 55 MIN_VAL FROM DUAL
    6  ),
    7  DT2 AS
    8  (
    9  SELECT 21 MAX_VAL FROM DUAL UNION ALL
   10  SELECT 37 MAX_VAL FROM DUAL UNION ALL
   11  SELECT 41 MAX_VAL FROM DUAL UNION ALL
   12  SELECT 51 MAX_VAL FROM DUAL UNION ALL
   13  SELECT 67 MAX_VAL FROM DUAL UNION ALL
   14  SELECT 76 MAX_VAL FROM DUAL
   15  )
   16  SELECT ID, MIN_VAL, (select max(max_val)
   17                         from DT2
   18                        where max_val
  

  Max
  [My Italian blog Oracle | http://oracleitalia.wordpress.com/2010/01/07/creare-documenti-office-da-plsql/]

• Help to get the minimum date of a table which is equal to given date

  Hello
  
  My table is as below
  
  Col1 Col2
  22 14 MARCH 09
  22 17 MARCH 09
  22 APRIL 14 09
  33 16 APRIL 09
  33 17 APRIL 09
  33 12 APRIL 09
  33 14 APRIL 09
  
  I want the query that returns the date min Col2 and if the date min is equivalent to 14 March 09
  
  This is Min 22 14 March 09 Min 33-12 April 09, I want to just below the result
  
  Col1 col2
  22 14 MARCH 09
  
  Kindly help me solve this problem

  Hello

  Welcome to the forum!

  user11834123 wrote:

  I want the query that returns the date min Col2 and if the date min is equivalent to 14 March 09

  I think that Artacus missed the part about March 14 09.

  Assuming col2 is a DATE:

  SELECT    col1
  ,        MIN (col2)     AS earliest_col2
  FROM       foo
  GROUP BY  col1
  HAVING       MIN (col2) = TO_DATE ('14-MAR-2009', 'DD-MON-YYYY')
  ;
  

  Remember that the DATEs always include hours, minutes and seconds. The above query displays a line only if the col2 earlier in the Group was exactly at midnight (00:00:00) on March 14. If you want any time March 14, change the HAVING clause:

  HAVING       TRUNC (MIN (col2)) = TO_DATE ('14-MAR-2009', 'DD-MON-YYYY')
  

• RMS / amplitude and phase to the fundamental frequency

  Hi, does anyone know how to find the RMS or amplitude and phase to the fundamental frequency of a signal measured in Labview?

  I tried with the Analyzer for harmonics of buit - in, but he can't give the values of the phase angle. I also tried the FFT VI spectrum, but I don't think the results are good.

  Thank you.

  Hi again

  Harmonic distortion Analyzer is a polymorphic VI, this means that if you connect a single signal in and then you get a unique signal, and if you connect a table of signals in out you a table.

  The VI I is not polymorphic, but you can easily change to work with multiple signals. If you look at the standard implementation for the harmonic distortion Analyzer N-channel then, he simply called the channel 1 harmonic distortion Analyzer a loop for. So you can easily call my VI in the same way. See attached screenshot:

  

  Best regards

  Anders Rohde

  Technical sales engineer

  National Instruments Denmark

• Take the minimum value for table data

  I'm storing test data in a table, with the hope that I can output the minimum value of the data. So far, I have used the table of max/min but can't make it work how I want. The test runs continuously in a loop of the holder. I get the minimum values in the table, but I would like to change the number of samples that the table contains, before it generates a minimum. The other option is that I run the test for a period of time (e.g. 3 seconds) and the table stores the data for this time then output 1 minimum value for the entire period.

  My current configuration VI is attached.

  Very appreciated

  Chris

  The size of the array in your VI is determined by the number of samples that you collect in your DAQ assistant, who is now 100 samples.  Never more, never less.

  How many samples do you want before you determine the minimum?

  Maybe what you really want to do is to build the table in the while loop and store it in a shift register, and when the loop has repeated enough times, then you take the minimum of built table.

• Get the frequency of a graph in real time of the waveform trace

  Hello

  I want to get the frequency of the graphics path in real time. The data comes from a connected to an Arduino UNO ADXL345. I use LINX to read data.

  I separated given x, y, z in order to plot separately and later to get their respective frequencies as well.

  Here is an excerpt of my VI as well as the front panel.

  

  I used a the Measurment file for each axes entry so I have a copy of the data.

  Before posting, I tried the LabView Spectral tutorial first. But it's different from what I want to happen because you know the exact frequency in this tutorial.

  I have also attached my VI.

  Thank you!

  If all you want is to know the spectral content of a signal in the time domain, there are a number of examples show how to do it. I would start by looking at the functions of the FFT.

  Mike...

• How to find the ratio between the two frequencies in the fft

  Hi, I'm Jean,

  I need to find the ratio of the frequencies of 1st and 2nd graph fft.

  Already, I received information of this site only. Mr. Alten helped me.

  Now, I have to continue the same problem and need to find the ratio of the frequencies.

  Please someone help me guys...

  I will attach my vi file and the text file.

  John,

  Should you report the frequencies or the report of the amplitudes of the components at these frequencies?

  The Information.vi of your multiple for the Signal Processing, extract > range of measures of waveform should do what you want.

  The frequency resolution is not very good because you have cycles relatively little waveforms (2 ~ for the lower frequency). I added a few zeros to improve resolution, even if a larger sample of data would be better.

  Lynn

• Get the value at a specific frequency

  Hello

  I'm new to LabView. Now I have a task to develop a vi that can add value at a specific frequency automatically.

  There are two channels of signals. These data are produced by an external generator with scan function. These signals, therefore, with a different frequency. My task is to get the amplitude of the signal at a different frequency in the following table. That is, the vi can be recorded 450,9 the vi "detect" the frequency of the signal is 100 kHz. And then output a table as follows. The attached VI is to mimic the signals swept as the following table. So how can I do?

  Any help will be much appreciated.

  See you soon

  Yang

  V1out	V2out	Frequency (kHz)	Ratio
  450,9	444.5	100.0	0.99
  447,4	445,7	200.0	1.00
  445,3	445,1	300.0	1.00
  444,8	458,7	400,0	1.03
  440.9	460,7	500.0	1.04
  437.0	468,7	600,0	1.07
  429,1	488.2	700,0	1.14
  417.0	496.4	800,0	1.19
  397,6	511.7	900.0	1.29
  378.0	535,4	1000.0	1.42

  Hi Yang

  I'll send your VI with a few changes, I hope that you are looking for and I hope that this can help you!

  Concerning

• minimum frequency of the square wave generator?

  I am trying to generate waves with a frequency lower than one, but it doesn't seem to be possible for some reason any. If I put it to 0.5 (for example), I just get a flat line. Tried to turn around the details of sampling (frequency 1 and Fs to 500) but still no go. Is it possible to generate frequencies below 1? Thanks in advance

  Assuming you are using the square wave function, simply set the number of samples to twice the sampling frequency of a.5 Hz signal. The default value of 1000 samples/s and 1000 samples gives you of course, 1 second of a data value. Pour.5 Hz, you must display 2 seconds to see the whole pulses (1/.5).

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  Na'amat salvation,

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  Tiara Product Support Engineer

  National Instruments

• Get the value of the frequency of the power spectrum

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  If it is the dominant frequency you are looking for you can use the vi extracted a single signal. You can also change this vi to include the details of the search if it isn't the dominant frequency, I have not included it in my example, but you can check it in the help file.

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