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Miscellaneous click and pops with delay block

Category: Software
Product Number: SigmaDSp
Software Version: 4.6

I have been tyring to implement a simple chorus effect on the ADAU1701 using a voltage-controlled fractional delay, and a couple of sinusoidal oscillators.

When I download and run the attached SigmaDSP program, the ADAU1701 outputs click and pops even with no signal present. These can actually be seen using the real-time display, as shown in the screen grab.

I don't understand the source of the problem, but I do know that when the oscillators are turned off, the clicks and pops stop.

I would love help from anyone who could explain what I'm doing wrong.

Thanks.

Delay1.dspproj

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  • Hello markscohen,

    Do you have a system controller "talking" to the part?

    I do not see any traffic on the Capture window so it does not look like you are sending communications using SigmaStudio. 

    You listed that you are using Rev 4.6. I do not think that is the issue. What hardware are you using?

    Feel free to upload your project. 

    Dave T

  • Thanks, Dave, so much for your quick response.

    I am running the program on a “ADAU1701 / ADAU1401 DSP mini board” of a type widely available online (unfortunately the forum doesn’t allow me to include the link”. A search on that phrase, or on “ADAU1401/ADAU1701 DSPmini Learning Board” will find the devices quickly at places like Walmart and AliExpress.

    The only possible communication traffic would be over the USBi that I’m using the tune the code. I can try to run without that connected, though I obviously would not be able to show the artifacts in the real-time display. Otherwise, the only connections are audio in and out.

    Notably, the problem goes away when I uncheck the enable boxes on the oscillators, so I don’t think that network traffic is the likely problem.

    Yes, I happen to be running on SigmaStudio 4.6, I do have 4.7.

    I did upload the project in my original post. If it’s not immediately readable, please let me know, and I can try to send it again.

Reply
  • Thanks, Dave, so much for your quick response.

    I am running the program on a “ADAU1701 / ADAU1401 DSP mini board” of a type widely available online (unfortunately the forum doesn’t allow me to include the link”. A search on that phrase, or on “ADAU1401/ADAU1701 DSPmini Learning Board” will find the devices quickly at places like Walmart and AliExpress.

    The only possible communication traffic would be over the USBi that I’m using the tune the code. I can try to run without that connected, though I obviously would not be able to show the artifacts in the real-time display. Otherwise, the only connections are audio in and out.

    Notably, the problem goes away when I uncheck the enable boxes on the oscillators, so I don’t think that network traffic is the likely problem.

    Yes, I happen to be running on SigmaStudio 4.6, I do have 4.7.

    I did upload the project in my original post. If it’s not immediately readable, please let me know, and I can try to send it again.

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