Systems and methods of audio processing and control for improved audibility and performance in a parametric loudspeaker system. The parametric loudspeaker system includes a parametric loudspeaker providing a capacitive load, an output stage having a plurality of switches interconnected in a bridge configuration and connected to the capacitive load of the parametric loudspeaker, and a controller operative to generate a series of pulse width modulation (PWM) pulses, and to generate a plurality of control signals synchronized with the series of PWM pulses for switchingly controlling the plurality of switches in the bridge configuration, thereby driving the capacitive load of the parametric loudspeaker.

Systems and methods of audio processing and control for improved audibility and performance in a parametric loudspeaker system. The parametric loudspeaker system includes a parametric loudspeaker providing a capacitive load, an output stage having a plurality of switches interconnected in a bridge configuration and connected to the capacitive load of the parametric loudspeaker, and a controller operative to generate a series of pulse width modulation (PWM) pulses, and to generate a plurality of control signals synchronized with the series of PWM pulses for switchingly controlling the plurality of switches in the bridge configuration, thereby driving the capacitive load of the parametric loudspeaker.

An assembly of a transformer and an electrostatic sound generator is especially efficient if the resonance frequency of the diaphragm is in the frequency range in which the generator is operated, such as in the interval of 1-20 kHz. Then, a smaller transformer with a winding ratio of 5000 or less may be used for feeding the sound generator, making the assembly suitable for hearing aid purposes or in-ear products such as for pro audio use.

An assembly of a transformer and an electrostatic sound generator is especially efficient if the resonance frequency of the diaphragm is in the frequency range in which the generator is operated, such as in the interval of 1-20 kHz. Then, a smaller transformer with a winding ratio of 5000 or less may be used for feeding the sound generator, making the assembly suitable for hearing aid purposes or in-ear products such as for pro audio use.

Techniques described herein generally relate to generating an audio signal with a speaker. In some examples, a speaker device includes an acoustic medium; and at least one ultrasound source coupled to the acoustic medium through at least one time-varying acoustic coupler. The acoustic coupler is configured to be electrically activated to operate at its mechanical resonance so as to generate an audio signal.

Techniques described herein generally relate to generating an audio signal with a speaker. In some examples, a speaker device includes an acoustic medium; and at least one ultrasound source coupled to the acoustic medium through at least one time-varying acoustic coupler. The acoustic coupler is configured to be electrically activated to operate at its mechanical resonance so as to generate an audio signal.

This disclosure provides systems, methods, and device associated with an electrostatically driven graphene speaker. In one aspect, the device includes a graphene membrane having a diameter of about 3 millimeters to about 11 millimeters, and a first electrode proximate a first side of the graphene membrane, the first electrode being electrically conductive. The device is a microphone or a loudspeaker.

This disclosure provides systems, methods, and device associated with an electrostatically driven graphene speaker. In one aspect, the device includes a graphene membrane having a diameter of about 3 millimeters to about 11 millimeters, and a first electrode proximate a first side of the graphene membrane, the first electrode being electrically conductive. The device is a microphone or a loudspeaker.

A MEMS speaker that may include a membrane positioned in a first plane, wherein the membrane may be configured to oscillate at a first frequency thereby generating an ultrasonic acoustic signal; and an acoustic modulator that may include a blind and a shutter; wherein the blind may be positioned in a second plane; wherein the shutter may be positioned in a third plane; wherein the first plane, the second plane and the third plane may be substantially separated from each other; and wherein the acoustic modulator may be configured to (a) receive or generate a shutter control signal and a blind control signal, and (b) modulate, in response to the shutter control signal and the blind control signal, the ultrasonic acoustic signal such that an audio signal may be generated.

A MEMS speaker that may include a membrane positioned in a first plane, wherein the membrane may be configured to oscillate at a first frequency thereby generating an ultrasonic acoustic signal; and an acoustic modulator that may include a blind and a shutter; wherein the blind may be positioned in a second plane; wherein the shutter may be positioned in a third plane; wherein the first plane, the second plane and the third plane may be substantially separated from each other; and wherein the acoustic modulator may be configured to (a) receive or generate a shutter control signal and a blind control signal, and (b) modulate, in response to the shutter control signal and the blind control signal, the ultrasonic acoustic signal such that an audio signal may be generated.