An innovative new take on the traditional speaker has been presented at the Hacker Hotel conference in the Netherlands, with an ultrasonic parametric speaker design from developer [Orange_Murker]
The design operates in a similar way to a radio, by taking an ultrasonic carrier signal and modulating it with the desired audio input, as a nonlinear medium in the air then demodulates the signal to produce audible sound frequencies
The developer drives the speaker using a 40kHz PWM signal via an H bridge, with the actual speaker consisting of an array of ultrasonic transducers emitting in-phase signals, allowing the device to project an extremely narrow beam of sound over a significant distance
The complete project is relatively simple to build and is outlined in full, along with video demonstrations, via the developer’s GitHub repository.
