analog signal comparison

[Joncombat]

I have a voice chip that I need to verify during production testing?  Is it possible to record a baseline message from a "golden Sample" unit and compare it to production units.  Can this be done with the MFIO card?  If so, do examples exist that demonstrate this?

[Now_With_Underscores]

Hey Jon,

This is entirely possible.  You would more than likely want to use one of our DSA hardware cards for this application, as they are designed towards acquiring sound and vibration measurements.  What we would need to do is record your 'golden Sample' into our device and then record each production unit's output and compare the signals in LabVIEW using our Sound and Vibration software .  If you'd like to speak with a sales representative, I can have someone contact you about your application.  Post back if you have any questions!

[Now_With_Underscores]

Hey Jon,

Yes, we do have lots of examples that ship with the sound and vibration toolkit.  Tell me a little more about your golden signal and I'll look into an example for your application.

[Joncombat]

The device being test is part of an alarm system.  When an input is tripped the voice chip annouces the zone in trouble followed by a 1K-1.2K pulsing siren (on time 3-5 sec off time 1-2 sec).  We currently use PXI and CVI for our test equipment.  The current cards available in our test system are the 4070 dmm, 6070 mfio, 6533 digital i/o, 2503/2565 relays, rs-232/485).  I would like to use the cards available if necessary to perform this task.

Jon K.

[Jason_D]

Jon,

If you don't have Sound and Vibration or DSA hardware like John recommended it should still be possible, but not easy.  With our E series card a phase delay is going to be introduced for comparing the two signals so you will have to manually compensate for that.  As this is not the recommended method for performing this analysis there is no "easy to use example" for this project if you want to get started I would suggest using the Waveform»Analog Waveform»Waveform Measurements»Waveform Monitoring Palette that should have the VI's you need.