Fig. 6: Demonstrated application for the eco-friendly flexible loudspeakers.
From: Scalable and eco-friendly flexible loudspeakers for distributed human-machine interactions
a Photo illustrating four rectangle loudspeakers (50 × 40 cm2) playing music integrated behind the curtain. b Loudspeakers with or without fractal spacer. c Photo illustrating a rectangle loudspeaker (50 × 40 cm2) playing music at the distance of 50 meters away. d Photo illustrating a loudspeaker driven by a self-made micro-voltage amplifier working with an audio signal source (laptop). e Sound wave and acoustic spectrogram of original audio of “University of Macau” (top), audio played by a mobile phone (middle), and audio played by our loudspeaker (bottom).
