02-06-2009 12:53 PM
02-11-2009 10:13 AM
I've been trying to write a program that takes in an audio signal and perform an FFT on it and display the FFT. I've been unsuccessful till now and I really need this program soon. Its a project in school. I am probably missing some knowledge that I don't have. I'm faily new to Labview. I have the updated program attached and if anyone has any idea on how to have an accurate FFT where the time domain is an frequency and the amplitude range changes to volts. I need to learn so please show me and explain.
Thanks in advance
02-11-2009 10:54 AM
post your new program. As I said before. I feel I can not give you more help unless you show me some progress in your learning curve
02-11-2009 06:13 PM
02-12-2009 02:37 AM
You have done something but I am not sure it is a progress. And you have not paid attention to the sample frequency (or rate), or its reciprocal delta t. Here is a golden nugget for you. Always then I need to learn about how functions work in Labview I go help in the toolbar, and then find examples. I suggest you also start with this practice. Search for sound. I am quite sure they have an example reading continuous sound.
02-12-2009 10:31 AM
quick question. I'm trying to connect dynamic data to a cluster of 4 elements. Its from acquire sounds vi to signal generation vi. Is there any way of doing that?
02-12-2009 11:01 AM
Your VI already takes an FFT of the audio signal, but then passes the resulting frequency domain data into several VIs which operate on the time domain. This will probably yield some interesting results at best. You really only need the Spectral Measurements. You might also want to scale the audio data to volts before passing it in to the FFT function, as was suggested earlier in this thread. Also, you do not need the while loop, as it stands it will just keep performing the FFT on the same set of data.
02-12-2009 11:21 AM
Thanks for replying. How would I scale the audio data to volts?
Thanks in advance
02-12-2009 11:43 AM
Randall Pursley explained how to do it on page 2 of this thread.
02-12-2009 12:37 PM
I read it but I don't really understand how to interprete that in labview. All I see are Vi to adjust the time domain but nothing for volts.