Patent ID: 11910150
Assignee: WAVES AUDIO LTD.
Field: Audio-visual technology (Electrical engineering)
Classification: CPC H  G | IPC G  H

Claim 10:
11. A method performable to control an electrostatic acoustic device including an audio signal input, a membrane, a first electrode and a second electrode, wherein the first electrode is disposed parallel to the membrane, wherein the membrane is configured to respond mechanically to a varying first electric field in accordance with an electric potential applied between the first electrode and the membrane, wherein the second electrode is disposed parallel to the membrane opposite from the first electrode, wherein the membrane is configured to respond mechanically to a varying second electric field in accordance with an electric potential applied between the second electrode and the membrane; wherein the first and second electrodes have through-holes configured for acoustic transmission to and from the membrane, the method comprising:
detecting a current or charge signal from the electrostatic acoustic device, the current or charge signal including an audio signal varying at audio frequencies, thereby producing an audio output signal varying at audio frequencies;
transforming the audio output signal to produce a feedback signal;
comparing an input audio signal at the audio signal input to the feedback signal to produce an error signal;
responsive to the error signal, inputting a control signal to the electrostatic acoustic device and controlling thereby acoustic transparency of the electrostatic acoustic device, from outside space through the through-holes of the first electrode, across the membrane and through the through-holes of the second electrode.