Amplitude and level measurements for stereo signal

Hi,
If I input my attached stereo file into Express Amplitude and level measurement (blue icon) it does not give me output value as an array. I want to measure peak to peak value for both left and right channels. I get only left channel value. (No array)
But if I use amplitude and levels.vi I get array as an output for both channels. So i have what I need but I thought I would just post here anyways.
I have attached my audio file.
Sheetal
Thanks.
CVI 2010
LabVIEW 2011 SP1
Vision Builder AI 2011 SP1
Attachments:
AUX_HP1_RSA_OFF.zip ‏13 KB

Sheetal,
The output of that express vis is of dynamic data type. You need to convert it to a waveform (use the "from ddt.vi") which will then give you the waveform data type. You can then use the "Get Waveform components" to access the "Y" array data.
Post to let us know if this helped out.
Chris C
Chris Cilino
National Instruments
LabVIEW Product Marketing Manager
Certified LabVIEW Architect

Similar Messages

Amplitude and level measurement two signals

Hello,
I am delveloping a data aquisition VI, I am using the DAQmx and it works fine. I am using the amplitude and measurement express vi to obtain data such as peak to peak etc... I can aquire up to eight channels using the DAQmx, just by selecting the physical channels, but the amplitude and level measurement vi only seems to give me the value of one of the signals (the first one aquired), even though two are being displayed on the graph or even three. How can I display all the peak to peak values for all waveform simultaneously. I am aware that the measurement express is a dynamic data type and conversting the output into an array would work, but I keep on getting errors. Any advice. Attached is the VI and a snapshot of the VI. I also tried splitting the signal with no luck.
Thank you
Attachments:
run.JPG ‏152 KB
Cont-Acq-and-Graph-Voltage-Int-Clk6.vi ‏144 KB

HI Tareq,
Well I think I tired what you said but it is still not working, here is a snapshot of my VI and the VI itself. I still get the same output
Thank you for your help
Alloush
Attachments:
Cont-Acq-and-Graph-Voltage-Int-Clk7mod.vi ‏145 KB
run.JPG ‏160 KB

Amplitude and level

Dear sir
What is the difference between amplitude & level measurement with vibration level measurement? I found both has measurement such as RMS and Peak value, but it gave a quite different value when I try it simultaneously.
Can I used the amplitude & level measurement to measure vibration level?

Product differences:
Amplitude and Levels Step is activated by SignalExpress
Vibration Level Step is activated by Sound and Vibration
Functional differences:
Amplitude and Levels Step gives a new result for every block (Step will hold peaks if you check that option)
Amplitude and Levels Step supports measurement of DC
Vibration Level Step always returns the result from the last reset
Vibration Level Step does not measure nor remove DC component; instead this step assumes vibration around equilibrium and/or that the data was acquired with AC coupling
Vibration Level Step supports time-domain integration (to convert acceleration --> velocity --> displacement) prior to the level computation.
Vibration Level Step supports industry-standard (fast, slow, impulse) and custom time constants for exponential level measurements.
What types of vibration are you trying to measure?
Vibration during shock event --> Amplitude and Levels
RMS level of an arbitrary signal --> Amplitude and Levels
Machine or structural vibration --> Vibration Level
In many cases, both steps can be used simultaneously Amplitude and Levels Step outputs can be used for trigger conditions. Vibration Level output (such as Exponential Level and Max-Min) can be used for logging and tracking of industry-standard levels.
Doug
NI Sound and Vibration

Error 20312 with Amplitude and Levels vi

Hello,
       I have been having a frequent error with a VI in a program I am using. The specific error is:
Error-20312 occurred at "ma_ptmFetch.vi" when called from "Amplitude and Levels N chan.vi"(waveform index 0 of 4)
Possible reasons: The input waveform is zero.
I am using the amplitude and Levels vi to measure the amplitude of 4 current waveforms that are being read into the DAQ card. The error message occurs usually right when the program begins to run, but does not always occur. The DAQ card that is being used for this measurement is a PCI-6071E, and it initially measures many curents and voltages, and then splits them up before sending them to the amplitude and levels vi. When the error does not come up the vi works properly and measures the correct current, so I am not sure what the problem is. If anyone could give me any insight as to what may be the cause of this error, or how to troubleshoot it it would be greatly appreciated.
Thanks,
Steve

Hello Mike,
       I believe you are right, and that this error occurs because the vi is receiving an empty set. When using the generate signal vi, I receive no errors at all, its only when trying to take input from the DAQmx read. I am reading continuous samples from multiple channels in a waveform, and then splitting it up into different sets. I made a small program to bar out any other factors from the large program it is in, and the problem still persists. Also, I tried changing to read only 1 channel. The problem still occurs at this setting, but less frequently than when using multiple channels.
       I believe I have found a workaround for this problem, but I'm not sure if there is a better way to go about doing this. I made a sequence with the Start Task vi in the first frame, and the while loop and clear task in the 2nd frame. The while loop contains the DAQmx read vi and the amplitude and levels vi. If I place a Wait vi in the first frame for a short amount of time, say 50ms, the problem disappears. Is it possible the Amplitude and Levels vi is trying to read values before the DAQ is finished starting the task and reading?
       I can attach a copy of the small test program I made if you want to see for yourself as well.
Thanks,
Steve

Pulse measurement for 500hhz signal

I am using USB 6251 daq card. I need to measure the number of pulses arrived with in some start time and end time. the saignal can vary upto 500k hz.Also i need the pulse arrival time for all pulses.
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Go to Solution.

I suppose what you are reffering to is the timestamp. when you use the low level VI's of DAQmx you can obtain the signals as waveform data type, which has the initial sample time t0, the sampling intervals dt as well the sample values array Y. You can do the rest by obtaining each of the parameters in waveform pallette.
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Large display for real signals

Hi everyone
I would like to show the values of my signal with a large display.
I have Signal express 2011
It is possible to do so?
Do I have to convert the signal to other format, Double?
Thanks in advance
Signal Express 2011, WinXP, NI PCI 6221, Ni cDAQ 9174, Ni 9235

You can use a digital display to show a simple numeric of your data, assuming your data is a scalar. If it is a waveform, you can either show it in a table (probably not what you want) or run it through a step, such as Amplitude and Levels, which extracts a scalar measurement from your waveform data, then show it or a digital display. You can change the type of display by right clicking the viewer, selecting View As and picking what you want.
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I'm measuring with SCXI Temperature Scan

You will want to use the best measurement system to take your thermocouple measurements. The following Knowledge Base article covers our recommended hardware to perform thermocouple measurements.
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Hi all!
Can Anyone please explain me with an example, how to create a custom measure for each level for a dimension? I dont mine if you use
one or more measures.
thanks in advance
hope someone helps me.

For example:I create a dimension for product_dim witch has 4 levels:total, class, family and item:
d_aben18
n1_aben18
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TRAP ON CLEANUP
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:D_ABEN18_long_description,-
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:D_ABEN18_long_description,-
:APPEND D_ABEN18, :D_ABEN18_H_aben18_HIERDEF,:D_ABEN18_N4_aben18_LEVELDEF,:D_ABEN18_parentrel,-
:D_ABEN18_long_description,-
"SAVE THE CHANGES
UPDATE
COMMIT
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SQL CLOSE c1
SHOW 'KK2'
Then I create a cube with use compression off, and in rules sum for example.
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VRB D_RETURN DECIMAL
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I report the measure, or I report the program, but then how can I see the values of the measure?
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Solved!
Go to Solution.

Hi CracKatoA.
Take a look at the link bellow:
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Amplitude and level measurements for stereo signal

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