Filtering of the signal

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• How to acquire the signal to very high sampling frequency

  Hello world

  My name is Luke Ho. I am trying to acquire the signal with Labview (Sthelescope). The signal comes from sensor acoustics, then filters and amplifiers to adapt to ADC rank (0 - 5V). Thus, the maximum frequency of the signal is 40 kHz.

  According to the Nyquist theorem, I sampled at least 80 Khz signal.

  Is there a sampling frequency devices like that? or y at - it another way of better? I used the Arduino before, but it was about 10 kHz.

  I need your advice.
  Thank you all and have a nice day.

  holucbme wrote:

  Thanks for your recommendation

  But is it possible without USB Data Acquisition, it is quite expensive for me.

  This is the cheapest option to NEITHER. I tried to look for options to other companies, but more I found in the same price range, or not answering is not your condition of sample rate.

• How to calculate the signal / noise from the graph?

  In my current project, I read a periphera voltage signal. the signal lead noise even after filtering.  So, to identify the necessary data, I averaged the signal.

  I have attached the file with an image of graphics. In this graph, the recorded data are drawn black and medium online graph is plotted in red. Now, I have to calculate the ratio of signal to noise to specify with these peak values. How to do?

  As the signal passes through zero, be careful in the way you set the signal / noise.  For sinusoidal signals, that ratio is defined as the RMS value of the noise (the signal with the desired sinusoidal signal deleted) divided by the effective value of sinusoidal component.

  First of all I would like to subtract the average value of the raw signal.  The difference is the noise.  You can set the signal / noise.  A RMS calculation might work.  If you have a mathematical model for the desired signal, a fitting for this model can be useful too.

  Lynn

• filter the peaks on the signal from ECG pulse!, help!

  Hello

  I have RCV of the ECG signal. I filtered the ECG signal and get the resource (interval between each pulse of ECG) records.

  

  The source of the signal have noise I use a threshold but sometimes spikes of failure. Like the previous capture. Normally, if you get a pic of fault detected, I'll try to find this index to add to the left or right of the peak, normally I add to the lower value. This works if it has only a bad impulse between 2 good.

  The problem come when I have more than a ridge between the two coupons.

  Also, when the impulse of R a loss threshold I have trying to find the index and get 2 new reading making division 2 peak value.

  I have attached the method I've used to adapt it. I only works if I have 1 Ridge added on real measures of R or pulse 1 loss R, when I have several pics no work.

  I would like to hear an idea to make it work better. I don't like the idea of removing the value interval, I have 2 hours of reading and if I remove the values I have lower data outoput is why I tried to summarize or division of values to get the correct reading without losing any data.

  Perhaps, there is any better filter for ECG of entry, so I have a R-own pulse and less noise between ECG pulses.

  Any advice is welcome.

  Best regards, Fred.

  Almost.  in the last step, you have extracted the real part of the complex waveform.  Instead, you must retrieve the extent.

  

  BTW, this idea isn't mine.  I got from this article

  http://www.ScienceDirect.com/science/article/PII/S0010482501000099

  

• Generating the signal as shown in the picture in labview

  Hello

  I'm using labview in 2011 and want to generate the second signal as shown in the picture attached in labview as I want to use it as input to implement adaptive filtering, if the first signal in the image represents the output of the adaptive filtering area.

  May I know how to generate a second signal.

  Thank you.

  
  

• Which is the correct Point on the waveform of the Signal?

  Hello

  Please see attached image.

  I have labview software which is to measure the load of a load cell output. According to me, that the reading is accurate, except with the software Labview, we get up to 50 lbs less when we read it with the oscilloscope technician.

  What I see is that the technician measure the amplitude of the signal at the top and when there is little noise reading of the oscilloscope is even higher because the placement of the cursor is higher.

  I see that LabView is more or less because when we place the cursor oscilloscope in the middle of the measurement at the center of the signal signal not top it it reads then the same my labview program. I also have a low bypass filter in labview software.

  Which are the correct measure points waiting for oscilloscope to measure? in the picture as an attachment the white slider is positioned correctly, or is the correct red cursor?

  It's just an example of image zoom to see better.

  Thanks to you all.

  JCollado

  If I understand you correctly the width of the track to noculars represents 50 lbs of difference as? If you think about how works a noculars, then the center of the line displayed is probably the most accurate. The line width is determined by a few things, noise superimposed on the signal being a. So, with a noise filtering in your LabVIEW its 'width of the line"program will be closer / diluent, as it will have removed some of the noise component. Place the cursor in the middle of the path displayed in the noculars is an approximation of this, sort of looking for the point where the noise is "average" out 1/2 top / in-1/2 under the cursor, which is about the signal of 'data '. It is difficult to make measurements of accuracy of a noisy signal with a noculars for this reason, where do you put the trace? If you were to remove the filter program LP you would probably get the equivalent of the "wide trace flag" which would be a series of values that plotted close the underlying signal, but with high and low variations equivalent to the width of the track.

  So after all this verbiage, I would read the trace Center, perform an average of noise 'eyeball '.

• App to determine the "Signal strength" airport

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  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

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  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?
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  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?

  Hello

  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,

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

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  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.