Cont Analog input and Analog output in waveform

[128]

Dear mates,

I am using PCI 6229 card to cont analog input a signal measured from a microphone, and phase-shifted, and cont output this shifted signal to drive a loudspeaker.

I am using the example of 'Con Gen Voltage Wfm-Int Clk', which is combined with Con Acq Voltage Wfm-Int Clk'.

Sampling rate is 10000 samples/second.

Samples per channel is 1000.

is  Analog 2D waveform is better than 2D DBL?

When I try to run this program more than 2 minutes, the analog output signal has some 'spikes' (it should be a smooth sine wave, since the analog input signal is purely a sine wave.). There is no error shown up and so, I don't think this is a buffer problem.  why the spikes happened (please see the attached picture)?

Many Thanks,

Cheers

Dan

[Prashant M]

Hi there,

Thanks very much for your post.  I have had a look at it and I was wondering if it would be possible for you to post the VI that you are using, on the forum so that I can take a closer look at the problem.  I was wondering, have you modified the example?

Please could you also tell me the number of cycles per buffer that you are using and also which version of LabVIEW that you have and what type computer and operating system you are running it all on. 

Thanks very much.

Kind regards,

Prashant

Applications Engineer

NI UK & Ireland

Message Edited by Prashant M on 03-17-2008 09:31 AM