Transformed Hilbert phase shift of 90 degrees

Similar Questions

• phase shifted PWM with Ni 9401 and Crio

  Hello

  Do you have an idea of pwm shifted 180 degrees?

  (duty cycle frequency and variable difficulty)

  I tried a design, but it seems in the graphics design works on the realtime.vi but it does not work with the fpga.

  Graphic output pwm FPGA are distinguished by the real time as you can see in the pictures.

  On the other hand, VI Fpga produce two pwm, as seen in the oscilloscope when the fpga VI runs.

  However, there is no phase shift between the PWM waves.
  It is a part of my thesis, but I'm stuck in this problem, so I need assistance on your part.

  Thank you.

  Best regards;

  My hardware:

  cRIO-9024 and cRIO-9118 chassis

  NOR-9223, 9263 - nor, nor-9401, or-9474

  two nor-9225 and nor-9227

  Hi Maurice

  Thank you for your help.

  Yes I want to that they will be moved with the right variable and 10 kHz. I put 49% maximum duty.

  I put the output into the same output block.

  Square wave generator does not accept 'loop' while.

  I have attached a simple FPGA project file. Could you please tell me what is my fault?

  The resulting Pwm frequency is 10 kHz, the only problem is always the shifters.

  So, I always need assistance.

• Phase shift a channel and display

  Hello

  I'm working on a project for which I have to display the I-Q constellation plot and normalize the data to fit a circle of unit RADIUS.

  I'm able to do this, but the problem is sometimes the signal in one of the channels is very low and therefore, the plot moves close to the routes (Please find attached the file, this is the best position, if a channel has a weak signal, the movements from point to one of the axes). When this happens, I want to add a phase shift of the signal (45 degrees and multiples of it) to bring to the back for the best position. I tried to use the extracted tone vi phase go, add 45 degrees, but how to rebuild the spirit of the new signal phase?

  Can someone help me please?

  Thank you very much

  Despres

  
  

• Align the two signals and measure the Phase Shift

  Hello

  I do an experiment in which I use the NI USB-6221 DAQ card. The jury is able to make 250 k samples/second. I want to measure two voltages in a circuit and find the phase shift between them at frequencies between 1 and 10000. First I ouputted a wave sinusoidal frequency variable through the Commission and applied to a test circuit. Then I used the Board to measure the two tensions consecutively (thus reducing the maximum sampling frequency at 125 k). I used the signals align VI and measured the two phases and then calculates the phase shift (VI attached in Phase 1). It worked well for the test circuit I built in which the phase shift went way logarithmique.20 degrees ~84.5 degrees and then stabilized. At frequencies above 5 000 Hz phase shift must have remained constant, but it varies more or less 1 degree. When the phase shift is 84.5 degrees, present a degree of variability is not particularly explicit. When I asked my program on the circuit that I really wanted to measure, the phase shift went from-. 5 degrees up to about 1.2 degrees. The change in the values of phase shift at high frequencies (> 3000) was environ.2 degrees. Given the small phase shift, this variation is unacceptable. Now I tried to use a sequence to each blood individually (increase the maximum sampling frequency to 250 k) and then align the two signals and measure the phase of each shift. When I use align it and re - sample Express VI to realign the two signals, I get the message "error 20333 analysis: cannot align two waveforms with dt even if their samples are not clocked in phase." Is it possible to align two signals I describe here? I enclose the new VI as Phase 2

  Matthew,

  I think I have an idea for at least part of the problem.

  I took your program data and deleted stuff DAQ.  I have converted the Signal on the chart control and looked then what was going on with the signal analysis.

  The output of the Waveforms.vi line has two waveforms, like the entry.  However, arrays of Y in the two waveforms are empty!  It does not generate an error. After some head scratching, reading the help files and try things out, that's what I think is happening: the time t0 two input signals are 1,031 seconds apart. Since the wavefoms contains 1,000 seconds of data, there is no overlap and may not align them.

  I changed the t0 on two waveforms are the same, and it lines up.  The number of items in the tables is reduced by one. Then I increased the t0 of 0.1 seconds on the first element. The output had both greater than the entry by dt t0 t0 and the size of the arrays was 224998.  Reversing the t0 two elements shifts the phase in the opposite direction.

  What that tells me, is that you can not reliably align two waveforms which do not overlap.

  I suggest that you go to 2-channel data acquisition and that it accept the reduced sample rate.  You won't get the resolution you want, but you should be able to tell if something important happens.

  You may be able to improve the equivalent resolution by taking multiple steps with a slight phase shift. This is similar to the way that old oscilloscopes of sampling (analog) worked. Take a series of measures with the signal you are currently using.  The make enough average to minimize changes due to noise. Then pass the phase of the signal of excitement to an amount that is smaller than the resolution of phase of sampling rate and repeat the measurements.  Recall that I calculated that for a 5 kHz signal sampled at 125kHz, you get a sample every 14.4 degrees. If shift you the phase of 1 degree (to the point/mathematical simulation), you get a different set of samples for excitement.  They are always separated by 14.4 degrees.  Take another series of measures. Transfer phase another degree and repeat.  As long as your sampling clocks are stable enough so that frequency does not drift significantly (and it shouldn't with your equipment), you should be able to get near resolution of what you need.  The trade-off is that you need to perform more measurements and may need to keep track of the phase shifts between the various measures.

  Lynn

• Two synchronized USRPs receive the same sine wave emitted by an another USRP, there is a phase shift random and obvious between the signals received from the 2 receivers

  Hello world!

  First of all, I use a USRP as a transmitter to emit a sine wave (the signal is exp(j2*pi*f*t)), and then I use the external clock to synchronize the two USRPs (Ref as PPS in are connected to the clock) as receivers. Receivers are in sync, and they are at the same distance from the transmitter, I thought that the signal they receive should have a nearly the same phase. However, in practice, the phase shift is big enough, and this problem really confuses me.

  It's the received signals of 2 receivers.

  Yes. What you observe is expected.

  Near the bottof of this document read the area 'alignment Phase vs Phase coherence '.

  http://www.NI.com/white-paper/14311/en/

  And also, for the alignment phase, see the following 'Angle of arrival detection with NI USRP '.

  https://decibel.NI.com/content/docs/doc-25716

  Erik

• With the help of a Butterworth filter without phase shift

  Hello

  I found this reference to the use of a Butterworth filter without phase shift http://zone.ni.com/devzone/cda/epd/p/id/2775 but I can't open the sample with LabView 2011.  Can anyone help?  The referenced file is attached.

  Is there another or the best way to do this?

  Thank you

  Attached is a version saved in LV2009.

  In such cases, you can validate the vi to the discussion of queries VI Upconvert.

  Ben64

• variable phase shift between two analog output signals

  Hey! I would drive two different piezo elements with an sine - / square signals and have a phase shifted output signals. After some trail and error, I was able to get a second analog output on my card PCI-6221 (using LabView 8.2) also allowed me to have different amplitudes for both signals. However, I could not output signal having a frequency different and most importantly to my request to have one of the signals variably shifted phase.

  Thanks for the very useful suggestion. I have attached the file .vi installation I've run so far.

  Hello!

  A way to generate waveforms is using the analog waveform Toolbox. I created an example VI that is attached and that shows you a way to use the base generating function VI. I saved for LabVIEW 8.2.

  I hope this helps!

• Phase Shift Key: Modulation Toolkit

  I am trying to simulate a phase shift key, I have followed an example of OR. the example worked fine and I used the same code but does not work my didi. The number of symbol is not correct.

  I have attached the VI, I could not know what the problem was. The chart of the constellation should remain constant, rather than moving and the number of symbol in the chart must be equal to the symbol on the control.

  Thanks for any help.

  Hello ade77

  Thanks for your post. It seems that your Eb/NO (10 dB) value is not high enough to get the right number of symbols in the right place. Try to increase this number and see if that helps. See the screenshot of your attached code.

  Let us know if this helps!

  See you soon!

  Corby_B

  http://www.NI.com/support

• Butterworth filter without phase shift

  Hello

  I would like to design a 6 without a phase shift of order butterworth filter on my signal. A cutoff frequency of 500 Hz was chosen with a sampling rate of 10K Hz

  Solved! Thank you ADE77

  

• Phase shift USRP N210 WBX has not remained constant

  Hello

  Here's the anouced;

  After setting the RF front end, each local oscillator can have a random phase offset by separators in the VCO/PLL channels. This shift will remain constant after initialization of the device and will remain constant until the device is closed or re-look.

  However,.

  I found the phase shift has not remained constant for some USRP N210 with WBX in system of synchronized receivers USRP N2x0 20 minutes.

  I'm currently building the measurement system of synchronized phase using USRP N200 x 2, x 2 OCTOCLOCK N210.

  CH1 and ch2 is connected with the MIMO cable

  Ch3 and ch4 is connected with the MIMO cable

  CH2 and ch4 is connected OCTCLOCK wiith 10 MHz and PPS.

  All entries were coupled to the SG not sincronized exit.

  attached screenshot shows the results observed for 200 minutes. .

  

  Right end indicates derivative of phase offset for 200 minutes;  white line is ch2 - ch1, red line is ch3 - ch1, green line is ch1 - ch4.

  It seems that each pair MIMO has kept the same phase offset but pairs diffreent MIMO.

  Is - this results?

  Here's the configulation in LabVIEW Block diagram.

  

  I tried like and found my phase USPR N210 WBX offset remains constant.

  http://forums.NI.com/T5/USRP-software-radio/USRP-time-and-phase-synchronization-for-source-localizat...

  My vi can be a bad thing.

  Sorry for the bad because of my misunderstanding infromation display.

  After fixing my mistakes of Vi, I'll show them.

• Meter with two adjustable phase shift

  Hello

  In this experimental device, I have a print head a TTL pulse-controlled piezoelectric ink jet delivering uniform droplets on a surface. I use the "time" version of the counter output vi (high-/ low-time) because it allows me to very easily change the characteristics of the droplets. I use a strobe approach for imaging the droplets as they are ejected. Basically, a strobe LED light is pulsed at a frequency that exactly matches that of the inkjet printhead. A CCD camera is used in order to imager droplets, who seem "frozen" on the screen due to the stroboscopic effect. Strobe LED is triggered by a train of pulses TTL (two pulse trains come from exits of meter on my USB-6353 X Series DAQ board).

  Of course, I could trigger both the inkjet Printhead and the strobe light with the same output of counter, which would ensure that their frequencies match. But it's really nice to have a 'strobe delay' that allows adjustment of the phase shift between the strobe triggers and printhead. The hardware supplied with the print head has this feature of strobe delay as an external button. It is useful, because you can basically lead through time by turning the button and view the formation of droplets when it leaves the end of the nozzle.

  I have a vi that may trigger sometimes the printhead and the flash, but I can't understand how to adjust a phase shift between the two, while the program is running. It should be possible, but I can't get it. I would really appreciate help with this. Attached is the draft code and a diagram which may help to explain what I want to do

  Thank you very much

  -Matt

  No - forget the INITIAL DELAY.  It's only for the (first) INITIAL pulse.

  You already want to adjust the time / low-time already, no?

  So having a new control called PHASE SHIFT, from scratch.

  Have a variable called OFFSET PHASE CURRENT, from scratch.

  When the PHASE SHIFT is modified (by the user), understand the difference between where he wants to be and where you are (control - PHASE CURRENT OFFSET) and add a lot of time the low TIMES, but only during a cycle.  Basically you're stretching of a cycle.  Store the new value in the course of PHASE SHIFT variable for next time.

• How can I do a phase shift and amplitude change on wavefile which is read in

  Hello all

  I have a wavefile which has two channels, left and right, I would make a phase

  SHIFT and amplitude change on one of the channels.  Can I split each channel

  in the tables, but I don't know how to do a phase shift and amplitude change on the

  Table to get the new signal.

  TIA sal22

  Hi Sal,

  Here's a way to implement the phase change:

  

  In regards to the change of amplitude, you could just multiply all of the table with the desired value.

• Record sound with mic, phase shift 180 degrees, then play?

  I'm looking to record something with a microphone, dephasing it (up to 180 degrees), then read it in a speaker.

  Is there a way to do this in Labview?

  I have several cards DAQ (NI 9233) and a microphone, more Sound and Vibration and a PC with speakers.

  In LabVIEW > help > find examples... search 'his', there are a few examples.

• 9225 and 9227 Module Constant phase shift (Drift)

  Hello

  I wrote a large VI and the am acquisition voltage and current with the 9225 and 9227. The phase of the voltage and current constantly derivatives. Its not just for phase a bit for all of the portion; the phase constantly cycles from 0 to 360 degrees. I have an excel file with locations showing what I mean. Series 1 = voltage 2 = current

  I wrote a small VI to do the same thing with nothing extra. I have not yet add the data record. I just use a graph to plot the voltage and phase. The voltage and current were still off!

  What do you think. Timers are bad on the modules? Slow computer? DAQ assistants are not good? IM using the internal timers in the modules.

  Synronizing at the beginning does not help because the signals would still go out of phase when even later. The load is a piezoelectric tube.

  I'm using Labview 2011 and NEITHER cDAQ-9178:
  9225 3CH 300 Vrms 24 BIT simultaneous AIN
  9227 4CH 24-BIT simultaneous AIN 5Arms

  See you soon

  I forgot to change to continuous. I do usually. The major difficulty that I did was remove the trigger "Start Digital Edge" completely. The trigger wasn't working properly with what I put it in, "PFI0"... Once I took it out, I got a sample invaded. I played with the numbers of the sample for the clock sampling and playback. I don't know why to use 25000 everywhere has not worked. But when I dropped the numbers to 6250 or something of this magnitude, the VI finally worked.

  The VI works with or without the clock I specified (Mod7/AI/sampleclock), which is great news! Thanks for this tip!

  The current and voltage are finally in sync. They will never out of sync! Finally I can calculate the POWER!

  This digital trigger was the worst headache... Thanks for the tips!

  I write the VI and the code snippet to my completed solution.

  

• measurement of phase shift between two periodic signals acquired

  Hello

  I don't know how to explain my problem, but I'll give it my best shot. I'm two signals from sensors in tension. Two periodic signals have the same frequency, but a different amplitude. Normally they have a difference of phase of 0 or 180 degrees. The thing I have to let labview to check is if the signals are completely in phase or out of phase (180 degrees) completely. I am acquiring the wizard scene DAQ in a while loop. Does anyone have an idea how I can do this?

  To summarize: are the two things I need to know

  -l'amplitude (maybe just pick max max min distance)

  -If both signals are moving in the same direction (when the two signals are in phase) or if they move in the opposite direction (counter phase) - the exact phase angle value is not so important

  THX

  Thanks for the reply. After a night to think about the problem, I came up with a home-made solution. I used the point by point max and min vi to calculate the distance from crest to crest of my signals. Then, I used the time derivative of point by point to calculate the variation of the signal of the two signals. If the signals are in phase (both are increasing or decreasing at the same time with the other), then the two derivatives have the same sign (accept on the summits, of which I have excluded from the comparison). If the signals are out of phase (when one increases, the other is decreases and vice versa) then the two derivatives are opposite in sign. According to this, I can get all information that I need. If anybody should know a better way to achieve the same result, please say, but to know that it seems to work.