Filter Boost Gain is wrong

SigmaDSP & SigmaStudio Hermione Apr 10, 2024 00:00 4 replies Original on forum ↗

Thread Summary

The user observed a -5dB difference from expected gain settings in the Filter Module using Sigma Studio version 4.5. The support engineer confirmed this as a bug fixed in version 4.6. To resolve, delete the filter block and re-add it in the updated version.
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Hermione Question

Apr 10, 2024 00:00

Dear Team,

We are using the following Filter Module

When using the Filter , we have observed that when setting the gain in the slider , there is always a -5dB difference from expected. Can you confirm if this is a bug, if yes , what is the fix for this.

Regards,

Hermione

Audio Signal Processors

software

ADAU1466z

Sigma Studio v4.5

SigmaDSP Audio Processors

adau1466

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Harishgowtham Reply

Apr 10, 2024 00:00

Hello Hermione,

I'm getting the expected results out of this block. Please look below.

2.8Vp-p is the output sensitivity of the eval board for a 0dBFS signal. I set the filter for -6dB, so it's a half of 0dBFS. please look at the output waveform for 0dB and -6dB below.

So, could you please explain how and where you measured the difference?

A step-by-step instruction of what you tried and how did you come up with those results would be helpful to simulate the same.

Regards,

Harish

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Hermione Reply

Apr 12, 2024 00:00

Dear Harish ,

Please confirm you are using Sigma Studio version 4.5 for this.

Regards,

Hermione

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Harishgowtham Reply

Apr 15, 2024 00:00

Hello Hermione,

Sorry, I realized that this is a bug in the SS 4.5, and it has been fixed in SS 4.6. Please look below.

One little thing to note is, the project (with that bug) which was created in SS 4.5, now if you are running the same project in SS 4.6/SS 4.7, then please delete that filter block and drag and drop it again and connect it. it will work as expected.

Regards,

Harish