NOISE REDUCTION FOR AN ACOUSTIC COOLING SYSTEM

摘要

The present invention relates to an acoustic cooling system (1) arranged for cooling by generating sound waves, said system (1) comprising a transducer (2) and a control unit (6) configured to generate a drive signal (S1) for exciting said transducer (2), wherein said drive signal is a multi-harmonic drive signal comprising at least one higher harmonic (A2-A5) selected to reduce the presence of at least one corresponding higher harmonic (B2-B5) comprised in the sound waves. The system is advantageous in that noise-reduction can be achieved without the need of incorporating a second transducer, thereby enabling a compact acoustic cooling system at a low cost.