Patent ID: 9674627
Date: 2017-06-06
CPC Classifications: H04R

Claim:
1. A sound reproduction system comprising: an electrostatic sound transducer comprising a moveable membrane structure and an electrode structure; and a controller configured to receive an input signal representing a sound to be reproduced and to generate a control signal for the electrostatic sound transducer, the controller being configured to generate a modulation signal on a basis of the input signal and to amplitude-modulate a carrier signal having a frequency substantially at a resonance frequency of the electrostatic sound transducer for producing an amplitude-modulated carrier signal, the controller being further configured to apply the amplitude-modulated carrier signal to an interdigitated comb drive of the sound transducer, the interdigitated comb drive being configured for causing a resonant or near-resonant excitation of the moveable membrane structure of the sound transducer to thereby displace a fluid adjacent to the moveable membrane structure in accordance with the amplitude-modulated carrier signal.