Audible clicks of noise generation/acquisition vi

Hey everybody!

Fast facts:

I'm doing a vi to perform measurements of room acoustics.  The goal is to apply white noise octave band filtered in a room until a level of balance is reached, then turn off the sound source and measure the decay of the sound field in the room.  So, my vi generates white noise, filter by octave specified parameters, at the same time sends the output and begins data acquisition using DAQ assistant 2 blocks (both caused by an external function generator).  I put the exit exit DAQ assistant N samples (same number as generated by the simulation signal block) and the acquisition of input data is set to acquire more samples that block signalling simulation generates so that I continue to acquire the signal after speaker cuts wide and measure the sound field decomposition in the room.

The problem:

The vi works perfectly except that when the speaker pauses at the end of the N samples is a notable very audible click, which must correspond to a kind of tip in the single output at the end of my example output N.  It is a big problem because it will change my measurements of the disintegration of his field. (see Appendix 1 for a screenshot of my vi)

I tried unsuccessfully to solutions:

(1) I thought that the click can be caused by sharply cutting the signal of excitement, so I tried to insert a block window to give a smooth envelope at the beginning and end of my signal.  The envelope fainted at the volume at well, but there was still a noticeable click and the end of the exit (after closing fade).

(2) I tried to zero-pad to the end of the signal, thinking that I might be able to output a signal of amplitude zero while I measure the decay curve and I hope to delay the inevitable apparently, then click on until I have capture my data.  However, when I do this, my production Assistant DAQ gives me an error that the sample rate is 1 and the valid range of sampling frequencies are 800 1000 to 204.  Apparently the DAQ output is sent a single sample of my table of output data.  (see 2nd screenshot below)

I'm really puzzled, so any help would be greatly appreciated.  Be it a way to correctly implement my solution #2 from above, a new method to get rid or delay the click, or if someone can point me to an existing vi that will perform the functions of noise-excitation/acquisition that I need.

FYI, the material is a PXI-4461.

Thanks in advance!

Michael K

Here's the code to 9.0. As I said I have not tested, because I have no data on this PC acquisition unit

Tags: NI Software

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