Coercian dot on the power spectrum

Similar Questions

• 'power' and 'size' in the power spectrum?

  When I choose "power at the stage of the power spectrum, numbers in my data were negative. I don't understand why. What is the difference between "power" and "ten factor"?

  And what are the "dB" and "linear" in the average of actual size selection? "DB" means the following equation? Vnorm = 20 * log10 (Vnorm)? 'Linear' means greatness?

  Thank you very much!

  
  

• Unit of the y-axis of the power spectrum

  Hello

  I am acquisition of acceleration of an IEPE accelerometer. Units of the axis y of the signal in the time domain are in (g). The signal in the time domain is then injected into the Spectral VI Express measures to obtain the power spectrum of the signal. In the Spectral Measurements Express VI, I put the results of linear and the window (Hanning). My very basic question is: what will be the units of the axis y with the linear option power spectrum and how can convert their return to unit (g). If you provide an example of calculation that would be very appreicated. One of my simple code is attached.

  Concerning

  Unit Conversion VI spectrum lie in LabVIEW palettes: functions > Signal Processing > spectrum analysis

  

• BER in the power spectrum

  Hello

  I have a question about BER and SNR and I would appreciate your help.

  I have a power Spectrum (live with the presence of interference) and I would like to know in what parts of the spectrum, I can achieve a target BER (lets say 10th-3)

  My suggestion was to first determine the signal investment ratio on the graph (for BPSK) and then search for available positions in the spectrum that can give me this SNR

  So say for 10-3 BER, en No. DB 9 (on the graph)

  If Eb (dB) = 9 (dB) + No. (dB) or Eb (dBm) = 39 (dBm) + No. (dBm)

  now my questions are?

  1 - instead of BER can I focus on NRS and are my calculations correct?

  2-noise background in my power spectrum is observed from BDP-110-130 dBm is not a value constant .what should I do in this situation to find Eb?

  3. What about interference? because WLAN is perhaps the received power - 50dBm in this situation that the SNR appropriate therefore to achieve this BER?

  is it correct to say Eb should be = - 50 + 39 (dBm)

  I thik find positions them avaiable in the spectrum (especially 2.4 GHz) to achieve a certain BER or SNR should not be as easy as I think.

  Hi tintin99, the calculation seems to me.

  For the second question, I don't know what application you are considering, so it is difficult to answer. If you measure performance to highlight, I'd go for the peak noise. To help us to give an exact answer, you provide more information about your application. For example, NEITHER-6115. The following link will be useful: NOR-6115 noise floor.

  In case you're only interested in theoretically calculate the background noise, please check for the radio receiver noise floor. According to the definition, you can calculate the background noise as follows:

  Background noise =-174 + NF + 10 log bandwidth

  Where NF is the noise figure.

  I hope my answers help. Still once, for questions related to the concepts of communications, please try discussion forum, I mentioned above. RF meter of NOR, please post to measure RF devices

• How to increase frequency resolution in the power spectrum?

  All,

  I work on the analysis of data GET vi, and manage mucho when it comes to display a simple power spectrum which gives a precise simulation of sine wave frequency I use now.  Most of the brain waves are between 1 to 50 Hz, and so I try to get a resolution of at least 1 Hz frequency.  However, no matter what I do (increase the sampling frequency, use different sub vi and blocks), the chart plot only in frequency of 10 Hz increments.  I know this must be a simple problem, but I can not find good documentation on this and would appreciate any advice anyone could give on this problem.  I'm racking my brain here!

  Nick

  You need to acquire a second data to get the 1 Hz resolution.  The increase in sampling rate only increases the bandwidth that covers the FFT.

  Frequency resolution = 1/sampling

  Scale of frequency rate of sampling/2 =

  For your application, you will need to have a sample of at least 100 Hz rate.  At this rate, you must purchase 100 samples to get the 1 Hz resolution.  At the 1 kHz sampling rate, you will need to acquire 1000 points for the 1 Hz resolution.

• Collect data from specific frequency of the power spectrum

  Hello

  I want to know how to collect data from specific frequency of power spectrum file. I'm trying to separate data from specific frequency of the original file.

  This will depend on much how your data is stored. You will need a way to read the file in LabVIEW and then a way to identify the data you want. I often record data in a .csv file, then I use "Reading worksheet" to get the data in a table. Then, you can simply use 'Index Array' to get the datapoints you need.

• Get the value of the frequency of the power spectrum

  I'm rather new to LabView and want to measure the frequency of the peak in a spectrum of power of a real signal. In addition, I want this value of frequency and amplitude to save to a file. Right now I am able to trace a spectrum of power using an express VI, which gives me the correct frequency value in the graph.

  However, I'm not able to extract the value of the frequency with different screws, I found in LabView after browsing through the various discussions in this forum. Can someone tell me please in the right direction? I use a digitizer NI PXI-5124 to record the signal in a rack of NOR.

  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.

  Ian

• Output power of the frequency spectrum

  Hello

  I have a pretty simple question. I m using the power spectrum of FFT and PSD vi. and have trouble understand output frequencies. If I understand the first line is DC-value and delta frequency then describe the following frequencies. But when I put for example in 8 points say sampling frequency of 4 Hz = 2 seconds of data to analyze, I'll be back 4 lines of data (including 0). If the first is DC, then the 2nd should be 1 / 2 Hz 1 Hz = 3rd place and 4th place = 3 / 2 Hz, but what about the frequency of 2 Hz Nyquist, why Don t I get this one? or is there something I don't understand?

  I also tried the example of Units.vi of FFT spectrum and can understand, but I still Don t get it.

  Help, please!

  Best

  Jesper

  FFT returns to power in frequency bins. The frequency of the bins is determined by the Fs (sampling frequency) divided by N (number of points), from DC (0Hz). For your case, the table returned would be:

  Bin 0: 0-0.5 Hz

  Bin 1: 0, 5 - 1 Hz

  Tray 2: 1-1.5 Hz

  Bin 3: 1.5 - 2 Hz

  So effectively Bin 3 holds the power of 1.5 to 2 Hz (which contains your Nyquist frequency).

• the power of the spectrum graph and butterworth filter

  Hello

  I am beginner in labview, I want to see the power spectrum of the sound samples, I want to see if there is any reason in these samples.

  I use spectral measure, and then I filtered with butterworth filter samples. For output I using waveform graphs.

  Before filtering the signal, I'm in the x axis of the graph between 0-22500 and the data mostly in 0-2500.

  I've tried to filter using these values (fs = 1000 Hz, 0.125 hz = fl and fh = 500 hz) and the graphics almost the same thing but the axis of the graph is between 0-0, 5.

  issues related to the:

  What is the x axis properties? Why is different, but the graphics are the same?

  Make the mistake with the program?

  Hi Limavolt,

  You have a problem with the bandpass filter VI, this VI generates only the signal of value i.e. table DBL. The signal is a cluster.

  solution 1: you need to calculate 'dt' using the sampling frequency and use VI waveform construction to generate a signal's own scaling. 

  Normally, dt = sampling frequency/No. samples

  Solution 2: replace the VI butterworth filter with filter VI express, this will produce signal without scaling.

  

• bandwidth of the function "power spectrum".

  I use signalexpress 2009. To analyze the acquired time signal from the area of the previous step in the same project, I applied the power spectrum function.

  DAQmx Aquire step is configured as follows:

  Acquisition mode: continuous samples

  samples read: 1024

  Rate (Hz): 1024

  With this configuration, I expect a bandwidth of 0-512 Hz power spectrum analysis. Instead, the function of the power spectrum gave me 0-820 Hz frequency components.

  How can I trust the result of 512Hz on?

  I've attached screenshots of:

  (1) my application project configuration

  (2) result of frequency domain

  Very useful information, thanks to you both for helping!

• Does not power spectrum HP ENVY Ultrabook 13-2057nr of the battery (at the level of 93% charge)

  Greeting,

  I have an unusual problem with my HP ENVY spectrum XT Ultrabook 13-2057nr.
  

  I bought this recently used computer.  The battery seems to be dead, so I replaced it with a new battery, which seems to be charge (to 93%).

  However, the computer will usually not market unless the AC adapter is plugged in.

  As a general rule, the laptop will not be under voltage battery (charged to 93%).  It will work normally if connected to the power adapter.

  From time to time, if the computer has been loading for 15 minutes or more, it will be under the battery voltage. However, if it is off, it will be only re-power-on if connected to the adapter.

  If someone had a similar problem or have thoughts?

  Thanks - Ric

  Hello Rico88,

  Welcome to the HP Forums!

  I understand that the battery does not load to 100% and has a strange behavior. To start, please try test and calibrate the battery. You should be able to know if the battery has problems.

  If the battery seems to be good, you can try to improve the performance of your battery.  For more information about improving the performance of the battery, please consult the following document: improve the performance of the battery (8 Windows 7, Vista).

  If none of this helps, you can try purchasing a spare battery if the computer is not in the warranty. If this is the case, you should be able to get a replacement in the HP support by phone. You can use this Web site for information about how to contact HP properly, based on your region: Contact HP worldwide

  Please let me know if you have any questions or concerns, and if it has helped. Thank you for choosing the HP Forums. Have a great day!

  Mario

• How to show the output of the signalexpress power spectrum in data dashboard

  Hey guys.

  I made a program that collect analog data from two sensors in vibration, and then I use the signalexpress power spectrum to get in the frequency domain.

  I would like to show the signals and the FFT in dashboard of data.

  It is not possible to display the data directly because the XY graph in data dashboard supports only the two figures on the right cluster table?

  Is it possible to convert data from the spectrum of power signalexpress table of cluster of two numeric values?

  Or any other ideas would be appreciated

  

  
  

• Save the wave shape of power spectrum

  Hey labview masters, I need help! I'm developing a labview program to calculate the power of a waveform spectrum injected into a signal acquisition interface 4461. The program gets the fft of the captured signal and return the array of power, as well as background noise spectrum. He is then sent to the host via a TCP connection.

  Everything works fine except that I can't record the signal power spectrum more he sent to the host. I tried to trace all the x / y values via the command waveform.vi in the field, except that I can't add the axis labels.

  Can you tell me how to trace the full spectrum of power, add labels and save it in the pc?

  Thank you guys

  João Matos

  Export image is an Invoke node, not a property node.

  Right-click on the graphic terminal of waveform and select Create > invoke node > export Image.

  Lynn

• How to get the normalizede power spectrum or spectrum of amplitude in laview?

  Hi, I'm recently analyze and compare the different beep power spectrum to various different sounds. In order to avoid the effect of the amplitude (which changes to different requirement, even for the beep even), I want to use the standard power spectrum or spectrum of amplitude standardized by deviding the power of each frequency components of total power of the sound signal at this time. So, how can I achieve this in labview?

  Thanks in advance

  What is the data type? If it is an array, you can just divide by the sum of the powers. This value can be designated independently, or you can just divide by the sum of all elements in the array (use Add the elements of the array).

• Spectrum X 360 (N1W02PA #UUF): best practices for the use of the power supply battery for laptop (spectrum X 360)

  Hello.

  I know the best practice to use the power supply to charge the battery? I heard that keep charging your battery while using Notepad deteriorate autonomy. I don't know if that's true, but I do not charge my spectrum X 360 at 20% power level.

  Kindly need some expert advice. Thank you.

  Hello:

  My recommendation is to follow the instructions provided in this document from HP to address... paying particular attention to the info listed according to the recommended battery care practices.

  http://h20564.www2.HP.com/hpsc/doc/public/display?docid=c00596784