Generating a control signal based on propagated data

A system for generating a control signal for use in a closed control loop, comprising

• a data propagator for propagating acoustic sensor array data relating to a set of acoustic measurements at a set of sensor positions towards a set of propagated positions to obtain propagated data relating to the set of propagated positions, the set of acoustic measurements relating to an apparatus or a product manufactured using the apparatus;
• and
• a control signal generator for generating a control signal based on the propagated data, wherein
• the control signal generator is operatively coupled to the apparatus and configured to at least partly control the apparatus by means of the control signal to establish the closed control loop,
• and wherein
• the control signal generator comprises a data analyzer for analyzing the propagated data in a spatial frequency domain,
• the data analyzer comprises a spatial frequency selector for separating at least one spatial frequency component of the sensor array data in the spatial frequency domain,
• the control signal is based on information in the spatial frequency domain and on the separated spatial frequency component.