A system and technique are presented, for use in remote sensing of acoustic and/or mechanical vibration data from an inspection region. The system comprises: input port for receiving input data comprising a sequence of image data pieces indicative of speckle patterns detected in light returning from an inspection region, at least one processing utility configured for processing and analyzing the input data, the at least one processing utility comprises: a correlation module configured for processing the sequence of image data piece and determining correlation function indicative of spatial correlations between speckle patterns in consecutive image data pieces, said correlation function being indicative of variation in position of points within an inspected region； a filtering module configured and operable for receiving and processing data on the determined correlation function for extracting data indicative on vibration having selected frequency range for determining data indicative of at least one of acoustic signals, movement and tactile vibrations of said inspection region.
