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I found some objects and blocks such as LockInPLL, LockInDemodulatorSettings, LockInDemodulatorMC and ... to build the "Digital Lock in amplifier" by LabVIEW.
In the small description of that blocks, I see this text "For more in-depth discussion about the filter and its options please see the filter section in the lock-in Demo User's manual" but I couldn't find that manual