FFT of the signal

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• How to measure/estimate bias of the signal

  Dear Sir

  I play the FFT of the signal that collects in real time of the hall effect current tranceducer SCT-013-005. I need to measure/estimate bias of this signal. Can you please guide me how I can do it. (My vi which is developed in LabVIEW 2012 is attached)

  I'll be grateful to you for your attention and consideration.

  Kind regards

  Urfee

  Hi tronoh,.

  What about using the function 'Basic average DC & RMS' on your periodic signal?

• Amplitude of the Signal after the FFT analysis

  I'm currently trying to find the amplitude of a signal after running a FFT analysis. I use this for image analysis MTF. I take the profile of the line of fire (with an alternation of black and white bars) and convert it to a signal. This signal is then introduced to a FFT Mag/Phase VI extent and output of the FFT. My program then enter the amplitude to frequency of alternating black and white bars.

  My problem is that the amplitude seems to be scaling by a factor. I would like to find the exact amplitude of the signal of my analysis. Anyone know the factor of scale or any problem with my program? I joined the program and the image that must be analyzed. Just browse to the image in the VI and run the program and you will see the MTF chart resulting.

  Thank you

  Ronak

  
  

• low Harmonic frequencies in the signal strength

  Hi all

  I try to know what are the causes of noise in my signal, whether it's a faulty hardware or my lack of knowledge.

  The system that I'm actually consist of two engines not to not (parker HV232) that provide the uprising due to frost harmonic + pitch motion with phase shift of 90 degrees (a kind of movement of fish tail beat). I have a load cell 3 - axes attached to the shaft of the motor, pitch, and it measures up, drag and torque on a plateau which oscillates in the tunnel water (oscillation is provided by these two Steps). Tunnel to provide the incoming stream.

  Signals of strength are captured through SG-23 + PXI-6221 daq card, I put the gain on the last of them to +/-200 mV for better resolution.

  When the engines are turned off, the noise level on the static signal is the threshold of resolution, and nothing strange is not shown in the signal, and its ghosts.

  The problems begin when I initialize the motion on the steppers, FFT of the watch signal of the low frequency spikes that are exact multiplies the frequency of oscillation, I have attached a PDF for example.

  Disengage amplifier/filter which was suggested by manufacturing, and suspect I have observed could be due to this I'm not sure at 100%. The VI I use filter band-pass data in the 0.2 to 6 Hz, but somehow I can still see noise beyond 6 Hz.

  I was wandering perhaps someone has experience with similar issues and can suggest a solution on how to get rid of these harmonics.

  Thanks in advance

  I'm not an expert in the dynamics of the tunnel, but from what you say, it looks like they can't be noise but components generated due to the rotation of a mechanical Assembly. Normally people refer to these harmonics in the form of 'order', which means that they are a multiple of the frequency of rotation.

  So maybe it's the attacker

  1. check by an expert (the one that includes the mechanical system that you are using) that to the point where you measure the force will not get the components of the order.

  2. understand what exactly is the measurand. What exactly do you want to do with the measured signal (RMS, FFT etc..) Then you will be able to figureout if components of the order may affect your measurement.

  Oleks wrote:

  Disengage amplifier/filter which was suggested by manufacturing, and suspect I have observed could be due to this I'm not sure at 100%. The VI I use filter band-pass data in the 0.2 to 6 Hz, but somehow I can still see noise beyond 6 Hz.

  During filtration, the attenuation in the band determines how fast the signals will be thinning of the hard shoulder.

• FFT of a signal display

  Hello

  I have a noisy signal to process (Please find attached an image of the signal) and I would like to use the FFT function on my signal to remove noise and recover the clean signal using the inverse of the FFT.

  I have trouble when I use FFT because I don't have a single peak while I'm supposed to have a curve and the noise on higher frequencies.

  Thank you

  Take a look at the clip and see what I've added.  Change the window size will change the threshold for filtering.  I offset the result by one just to make it easier to see in the waveform graph.

• FFT of the data in a table

  I would like to perform an FFT on a digital signal periodic sampling.  For the moment, my signal is stored as an array of 16-bit integers (0-65534) item 8192.

  I tried to connect this table directly at the entrance of the fft.vi X, but the data that comes out of the FFT {X} seem little logic (table length 8192 with spikes, the beginning and the end of it).

  Any advice would be much appreciated.

  Okay, that's better

  The reason why you don't see the desired result of FFT is easy:

  (a) you have a shift of 8000 to your signal. He is peaking at 0.

  (b) your signal includes approximately 2.6 times. Given that the FFT concatenates virtually your signal from - inf to + inf in the time domain, your signal a 'jump' inside that create spikes in your field of frequency 'somewhere '. To prevent this, you can either use windowing or cut the signal of your time domain to contain a whole number of periods (which would then along 6400 samples).

  hope this helps,

  Norbert

• App to determine the "Signal strength" airport

  I have 1 Airport Extreme Base Station (5th generation) in my house.

  I have a 2nd Airport Extreme Base Station (also 5th generation) in a separate building in my back yard.

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  I'm sure I used to have an App on my iPhone that would check the 'intensity of the airport Signal' as opposed to the 'speed '.

  Maybe it was on my old iPhone 4S & it was never transferred to the iPhone 6 Plus?

  Whatever it is, I can't seem to find the app anywhere.

  Does anyone have an idea on what this app can have been called or who made it?

  Any help would be greatly appreciated.

  iOS does not allow access to the wifi signal measures last I checked...

  However, I can recommend the app Netspot (PC/Mac friendly) to measure the signal wireless throughout your home.

• 40TL933F - lost the signal while turning on Xbox or ADSl box TV

  Hello everyone,

  I just bought a 40TL933F yesterday and I watch TV via an antenna: everything is good, but when I turn my xbox or my router, the signal is lost. He then reappears when I turn my xbox.

  Does anyone have an idea to explain and fix it?
  Thanks for your answers,

  Socrate25

  Would it be possible that your TV will automatically switch to the channel where the Xbox is connected?

  I have another TV and something similar happens to me if I turn on my blue ray player.
  The TV detects the blueray drive and will automatically switch to the HDMI port where is connected the BD player.

• Apple Watch heart rate monitor, the signal can be shared with other devices such as the Garmin Edge 520?

  Apple Watch heart rate monitor, the signal can be shared with other devices such as the Garmin Edge 520?

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  No, that it is not currently possible.

• Qosmio G30-220: HD-DVD via HDMI - error message Impossible to export the signal

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  When I play a HD-DVD on my G30-220 LCD_panel, it works like a charm (with the Toshiba HD - DVD player software).

  When I switch to dualview to export the signal through HDMI to my LCD TV (HDCP), I get an error message:

  ' Cannot implement the signal. Please switch to the internal display "(this is not the exact English message. I get the error message in Dutch and I've translated).

  Hello

  As much as I know the dual display is not possible. Either watch you on LCD display or on the TV. The two of them at the same time will not work. Reason because it's the protection against copying, and also because of very high data transfer.

  I tested it with Qosmio friends on my LCD HD-ready TV.

• Have signal via Qosmio player, but failed to retrieve the signal on WMC

  I have to be halfway there, but after connecting my NTL cable box to the Qosmio and who received advice to get my signal through the reader and the F2 key, I can't then the signal in Windows Media Center.

  As I am only interested in recording TV shows, I really need find a signal through WMC. Please can someone help I think I ever recover calls promised from the technical support line. Oh, I followed all the instructions, but the analysis through Windows Media Center does not give any signal.

  ADMISI,

  Exactly how do you connect your NTL cable box to your Qosmio?

  Willow

• My Toshiba 22EL833G ceases to receive the signal from my Satellite U300 - 13H

  Hello

  When I connect my laptop to the TV and turn it on, I first receive signal at the entrance to loading windows, but when it comes to enetring my password, stops the TV receives the signal. I'm sure that problem comes from the TV as when you use another screen, everything is ok.

  Does anyone know what I can do?

  Thank you all for your time

  Hello

  What password do you mean exactly?

  If you think the troublemaker is your TV then you're in big trouble.
  Why? Because there's not a lot of parameters that could be changed.

  You must ensure that you use HDMI right channel (I assume you are using HDMI connection). From my point of view, it is one and only parameters that must be set for television.

• ConfigFree does not show the intensity of the signal

  ConfigFree works properly - except that the Wifi strength is displayed at the highest level for all sources, regardless of how effective. (as it is deducted from the source location and the signal strength indicated by the utility windows)
  I.e. all access points are on the inner ring.

  I am running Vista on a Portege M400 with Configfree version 7.0.0.24 and Intel 3945abg driver 11.1.0.86. I got the Intel proset utility loaded, but they would not show the signal strength at all. So I unloaded it.

  I tried rolling back the drivers for the driver Wifi and Configfree with no change in behavior.

  Any suggestions at all would be welcome.

  Rod Laird Australia

  Hello Rod

  I use Vista on my Satellite last Vista designed ConfigFree utility, but I never noticed the signal WIFI is displayed there. Can you please explain exactly where this signal must be shown?

  When connected to WIFI, you can see the small symbol in the task bar but this symbol belongs to Vista and the symbol of the strength of the signal is also visible in Vista network and sharing Center.

  Sorry but I do not see this symbol in Configfree directly. When my laptop is connected to WIFI all I see in ConfigFree is connected (blue) status and the connection between PC icon and black (marked as G) WLAN. It is also interesting that the small blue animation moves along that black line.

  All that s!

• Tecra A8-143 - can I pushed the signal strength?

  I have Intel Pro Set Wireless driver on my Toshiba Tecra A8-143 and signals I have recive in my neigborghoud is very week.

  It is possible to push the signal strength somehow? There is an amplifier of signal to the Bay, or something?

  Hello

  > and signals I have recive in my neigborghoud is very week.
  Laughing out loud
  Why do you want to receive the signal of your neighborhood?

  Unfortunately, you can boost the signal t. This is possible on the router directly and there is no improvement for the wireless network adapter.

• How to test the signal strength of an Airport Express, which extends a network?

  I am trying to understand how my Airport Express is actually help to expand my network, and if I should move somewhere different. Any help would be appreciated!

  Current situation: my base station is an AirPort Extreme in our apartment computer room; for the internet, which is plugged into the wall. The wifi network is extended in the living room via an AirPort Express (version 7.6.4). There are on the same cabinet as the AirPort Express to Apple TV. The Airport Express has an optical cable connecting to a sound bar (which has an additional HDMI connection to the TV).

  I don't really know if the AirPort Express Terminal, he does something useful. The network is set to be extended, best I can tell: Airport Extreme network Mode is "Create a wireless network", and network Mode of the AirPort Express is "extend a wireless network. But still, the wifi on my iPad and iPhone signal strength seem to fall much in the living room. Apple TV usually broadcasts music from my desktop computer (in the computer room) well enough, but if I try to play music from my computer via the Apple Express at the soundbar, the connection is terrible and fall. (Which could be a problem with wifi, or could be an aging Airport Express question, could be a cable problem or might be a sound bar problem...)

  An example of what worries me: if I go to the Airport utility on my iPhone and a glance at the Airport Extreme, it has 4 Wireless, including Apple TV clients. But if I look at the AirPort Express, there sometimes a client wireless (iPhone), but never shows the Apple TV: even if the Apple TV is about 30 cm of the Airport Express. It's as if the 30cm distant to the Airport Express connection is weaker than the connection of two-rooms-distant Airport Extreme, but I am probably wrong that.

  In any case, is there a way to test what speed is through the AirPort Express, compared to through the extreme? I tried to use applications like CloudCheck on my iOS devices, but those only measure the speed of my network, and it is unclear whether or not he uses the Extreme or Express.

  Thanks in advance and all apologies if I used (almost inevitably) 'Express' when I should have used "Extreme", or vice versa, somewhere at the top.

  One way to see the strength of the signal is the Alt (option) key while clicking on the WiFi icon in the menu bar.

  But you see not directly related to the airport of arrival. Also the Airport utility does not give much information.

  You can see a lot more with the free app (Appstore) called "WiFi Scanner".

  The problem could be that the place you have chosen for the Airport Express can be better: it should be somewhere in halfway (in force) between the Real and where you sit with the iPad/iPhone.