negative reaction sigma delta

[altenbach]

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sorin83 wrote:
I am a begginer in labview.Please make me this in a simple interface becouse i don't understand this.
Something simple just a waveform chart .My input single is audio from the microphone.It is a 16 bit single ,I am not sure about this.

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One way or another you need to learn some basics of LabVIEW. My code is very simple and you should be able to re-use most of it. If you don't want to learn, we cannot help you. What good is code that you don't understand? If this is for a class and you think we do your homework for you, you're out of luck. 😉

It does not matter where your data comes from, it's simply a set of values. In order to transform it into a bit stream, you just need to decide on an output bit rate time that is significantly faster that your sound sampling rate. You don't say what you want to do with the output. Is this just a learning exercise?

As I said before, this is typically done in hardware as a means of AD conversion. Once you already have your sound as a waveform, it seems silly to convert it into a bit stream. Why???

[sorin83]

Look what I have done.

Run continous for viewing the  waveform.

It is ok?

Please help me to learn labview.

Message Edited by sorin83 on 03-23-2008 08:08 PM

[altenbach]

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sorin83 wrote:

It is ok?

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It is only OK if it produces the expected result. Does it? I don't think so. 😮

No, it makes no sense. You only get one bit for the original data array, which is not enough to reproduce the data. You set N to 100000, but your array is only 128 samples long. Since you are autoindexing at the loop boundary, the loop will only run 128 times. Wiring to N is not needed and makes no difference in this case.

[sorin83]

How can I make this?

please i need help.

[CarlaU]

Hi sorin83,

From your question, it seems that altenbach's solution should do almost exactly what you need to do. I would suggest to start with what he created (re-build it in LabVIEW) and then if you have specific things that you have questions about, go ahead and post those questions here so we can help you out. I think with more specific questions about certain parts of the code, we can help you understand how the code works.

Carla

[Travis_M.]

Hello sorin83,

I think you will need to contact your local sales representative to discuss how to obtain a licensed copy of LabVIEW.  The version you are working with is a pre-release build and may have many problems that are not in the shipping version of the product.  I do not think that this is what is causing you problems here, but you need to have a licensed copy for National Instruments to assist you.  After speaking with your local representative you can ask to speak to a support engineer directly who will be able to give you lots of direct help on any NI-related question you may have.  Please contact your local office.

Thanks,

[Mystogan]

im pretty new with LABVIEW, and I needed to find a Delta Sigma Modulation example. And then I found this example from Altenbach. Thank you very much for this wonderful example.