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AssigneeUAB Neurotechnology
InventorsOsvaldas Putkis, Gailius Vanagas, Marius Mikolajunas, Darius Virzonis
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The present invention discloses a method for producing parametric sound using parametric sound system which is based on ultrasonic electrostatic transducers. It comprises modulation of a carrier ultrasonic signal with a processed audio signal in audio signal processor comprising adaptive frequency filtering based on the audio signal level, dynamic range compression, square root operation, amplification of the modulated ultrasonic signal using a D-class amplifier, driving an electrostatic transducer and generating modulated ultrasonic waves into the air. The electrostatic transducer for the parametric sound system comprises a specific back plate structure that improves electromechanical efficiency of the transducer and also enables realization of a phased array on a single back plate. The disclosed manufacturing method of the electrostatic transducer comprises producing sets of electrodes on the surface of the back plate forming individual cells.
A method for generating parametric sound comprising modulation of an ultrasonic signal with a processed input audio signal and driving an electrostatic transducer with a modulated ultrasonic signal characterised in that, the processing of an input audio signal comprises steps of:
Parametric audio system for generation of parametric sound by driving an electrostatic transducer with ultrasonic signal modulated with processed audio signal comprising an audio signal source, an ultrasonic signal source, an audio signal processor, a modulator, an amplifier, and at least one electrostatic transducer characterised in that the audio signal processor comprises a high and/or low pass filter with parameters controlled by audio signal level, a dynamic range compressor, a peak detector, a means for summing, and a means for square root operation.
Electrostatic transducer comprising:
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Dependencies are inferred from the claim text.