How to have Sound Input Read VI read .wav in sections

Hi,
I'm trying to read audio data from my laptop's soundcard, and it's really slowing down my VI's processing power. I read on the NI website to read the .wav file in sections instead of as a whole, but I have no idea how to do that. Any suggestions? My VI is attached.
Thanks!
Attachments:
signalgen.vi ‏56 KB

You have set the sample rate for the sound card to 100000 samples pr second. That is a sample rate your sound card will not be able to handle. Hence a error will occur. And you will not get any data from the sound card. Some sound cards may support samplerates in 1 Hz step but most sound cards do only support some rates. The latter is most typical. All sound cards do support 44100 Hz sample rates but typical sample rates are 44100,22050,11025, and 8000. Some sound card do also support higher sample rates than 44100. Refer to your sound card documentation for this. Your way of using the Daq card by reading 1 sample on each iteration, using software timing is also a Daq NO-NO. Read data in chunks and do not do to many updates pr second, and always use HW timing. If you need the waveform to appear "live", or "real-time" 10 updates pr second is more than enough.
I have included a sample vi. I suggest that you use that as your workhorse from this point. At least if you want more help from me
Tip Labview is shiped with many very useful examples. Then you are stuck. Go to toolbar->help->fFind examples. As one example the Daq setup is from the "Cont Acq&Chart Samples-Int Clk.vi" vi example
Besides which, my opinion is that Express VIs Carthage must be destroyed deleted
(Sorry no Labview "brag list" so far)
Attachments:
workhorse.vi ‏37 KB

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On my computer I have discovered some strange behavior then reading data from the sound card. Then the buffer size is 2x samples to read everything is as expected. But since I read the sound card 10 times pr second I feel a .2 second buffer is to small. I am using XP, and XP is not a RTOS so with a buffer set to 0.2 seconds I may lose data. Therefore I set the buffer size (number samples/ch on Sound Input Configure.vi) to be in range of 2 seconds. The result then is that then reading from Sound input.vi, a reading often take more than 0.1 second. On my computer it is often 500mSec. Then the next 5 read follows with almost zero interval. I do not loose data. But on my front panel the graphs looks like an very early silent movie. This error was introduced in Labview 8.x. To be honest I think the labview 7.x sound system was much better in many ways.
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Message Edited by Coq Rouge on 09-07-2009 10:54 AM
Besides which, my opinion is that Express VIs Carthage must be destroyed deleted
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Attachments:
Continuous Sound Input with timing.vi ‏23 KB

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If you take a moving average of the 0.2s buffer vs. 3s buffer at an update rate of 10, then they are the same (just under 100ms), so the average refresh rate is the same. I agree that is odd behaviour that the time between sound reads go to zero quite a lot then take a long time once in a while (presumably to fill the buffer
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How to have Sound Input Read VI read .wav in sections

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