How to upgrade output during input/output synchronized?
Hello
We use an input/output series card m PCI-6289 to provide participants sound while recording the EEG.
Our inputs and outputs are synchronized using the diagram that is attached.
To date our output audio segments have been relatively short. However, now we want to output sounds which last a long time. I've run into shortages of memory by using the current diagram.
Could someone suggest how I could update the audio output, regularly with pieces short 1 sec, in the loop in the diagram attached?
I tried to move the DAQmx Write.vi (point 4 on the diagram) inside the loop, but the output signal was not correct.
Thank you very much for your advice!
Frenk
Hi Frenk,
Can you be more specific about the error that you are experiencing?
Have you heard of the regeneration of analog output? It can be used with a property DAQmx writing node.
Regeneration is the repetition of the data already in the buffer. Standard regeneration is when the PC buffer data are continually downloaded on the FIFO to write. If the data buffer is smaller than the size of the FIFO, it is copied as many times as possible in the FIFO before the start of the generation. This is done to reduce the risk of errors of bandwidth by transferring is not the new data down to the FIFO fairly quickly. Once started, the generation of the copies of the data are no longer manufactured to fill the buffer. New data can be written in the buffer of PC at any time without interrupting the output.
You can also use the FIFO regeneration. With regeneration of the FIFO, the entire buffer is downloaded on the FIFO and regenerated from there. Once the data is uploaded, new data cannot be written to the FIFO. To use the FIFO regeneration, the whole buffer must fit within the size of the FIFO. The advantage of using the FIFO regeneration is that it requires no communication with memory primary host after the operation started, thus avoiding any problems that arise due to the excessive movement of buses.
Take a look at this link which travels with the regeneration: http://www.ni.com/product-documentation/3874/en/
Tags: NI Hardware
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