PIEZOELECTRIC-MEMS HIGH DIRECTIONAL LOUDSPEAKER AND BEAM STEERING METHOD THEREOF

Beam steering precision enhanced loudspeaker

This technology concerns a piezoelectric MEMS-based superdirectional loudspeaker and beam steering method.

In the case of audible sound, the frequency is low, so the sound is transmitted in all directions unless the transducer is very large, so this technology proposes a piezoelectric MEMS-based super-directional loudspeaker capable of precise steering of the sound wave beam using a parametric array in the air.

This technology enables independent driving of the transducer by implementing the transducer in a three-dimensional connection structure, improving beam steering precision by precisely controlling the phase and amplification gain of the driving signal. In addition, the performance of the loudspeaker can be improved by minimizing wiring length deviation and ensuring the precision of the driving signal.

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Key Features:

• The core principle of piezoelectric MEMS using a parametric array including multiple transducers that generate ultrasonic waves
• Obtained by measuring the output of each transducer while applying the same reference voltage to multiple transducers
• Modulating the input signal into a driving signal corresponding to each transducer using a carrier wave signal
• The driving signal applied to each transducer using a plurality of power amplifiers connected one-to-one amplification

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