Hi Antonio,
As Bob mentioned, the users in the Sharc forum can probably help you with this particular issue.
However, you may still find this helpful as a reference for changing the system sample rate in SigmaStudio:
FAQ: How do I change the samplerate of my SigmaStudio system?
This FAQ is SigmaDSP-specific. There may be some additional steps required for the Sharc use case.
