speedy-33 feedback loop

[Alantino]

Hi, i'm using speedy-33 as my DSP target and i wish to perform a feedback loop. i tried the example found in the NI website but it shows error that the array size is mismatch. Does anyone know how the data flows? Let say when i create an analog input, it is a 1-D array. Inorder to create a feedback loop i need to create an array of known size 1st, am i right to say that?? From there onwards, wat are some of the ways that i can can my array size or when do i need to alter my array? Can anyone pls help?? Thanks

[Steven_C]

Hi Alantino,

Thanks for your post. You are correct to say that you cannot dynamically allocate memory when using LabVIEW DSP module targets. I am not sure exactly what example you are referring to but here are some addtional details on this that may help you better understand and workaround this constraint:

How Can I Be Successful With Arrays In the LabVIEW DSP Module?

http://digital.ni.com/public.nsf/websearch/684D71E7BFD4D56C8625700E00662BF7 

Why Do I Receive an Error When I Use Stacked Shift Registers in My DSP VI?

http://digital.ni.com/public.nsf/websearch/0B37248F9063664D8625700E006A9E64 

I hope this helps. Thanks Alantino and have a great day!

Best regards,

Steven C

[Alantino]

Hi steven,

Thanks for the reply,

Using labview 8.2, DSP target speedy-33

Currently i'm trying to get a feed back from my sample delay function then add back to my signal to create a reverberation effect.

problem

1)the waveform i see from my waveformchart are square wave.

2)I try to set my frame size at 1024 but the programm just run for a few sec and stop.

3)my audio signal sounds like transformer singing!! 

can someone help me point out where my problem lies on??

Thanks in advance.