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Faulty frequencies in Sigma Studio

SigmaDSP & SigmaStudio LA6NCA Feb 4, 2016 00:00 3 replies Original on forum ↗
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LA6NCA Question
Feb 4, 2016 00:00

I have chosen Fs to 48 kHz.

All filters in the Sigma Studio have actually a frequency that is four times the value.

A filter at 250 Hz has really a frequency of 1000Hz.

So I switch the Fs to 192 kHz.

Then all filters were correct.

Why does not 48kHz work corect?

I use an ADAU1701 DSP.

Audio Signal Processors

SigmaDSP Audio Processors

adau1701

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ADIApproved Reply
Feb 5, 2016 00:00

HI Helge:

Changing the Frequency in SigmaStudio doesn't actually change the clock and/or register setting (divider) that you supply to the part. The SigmaStudio frequency is to allow the PC to calculate all filter coefficients. In other words, it only takes care of the SW side of the FS change, not the HW.

Let us know if this is clear to you.

Regards

Miguel

LA6NCA Reply
Feb 6, 2016 00:00

Thank you for the answer.

I found the settings in DSP CORE block.

I've set it to "1X" and everything worked fine.

Thanks for the help.

Helge Fykse

(Here is my amplifier:-)

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ADIApproved Reply
Feb 8, 2016 00:00

Thanks Helge:

What is your amplifier. Is it attached to the speaker?

Thanks

Miguel