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ADAU1787 Sigma and Fast core numbering formats

SigmaDSP & SigmaStudio larmac Mar 30, 2021 00:00 2 replies Original on forum ↗
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larmac Question
Mar 30, 2021 00:00

Hello,

watching values coming from the fast core to the sigma core I can notice data range [-1...1] like on the picture below.

Is there something wrong with my configuration or the fast core is using different numbering format ?

Thanks in advance !

values.png
values.png
larmac Reply
Mar 31, 2021 00:00

Hello,

the answer is: "All inputs and outputs to the FastDSP are 24 bits (1.23 format)". It's the reason of the data range limiting/saturating to [-1..1].

Best regards

Mariusz

DaveThib Reply
Apr 2, 2021 00:00

Hello Mariusz,

Yes, all the data paths between cores and ASRCs and SRCs are all 24 bits. There is more headroom in the cores but you need to get the signal back to a 24 bit number when exiting the cores.

Dave T