Devices such as smartphones and televisions are beginning to employ screens as both a video display and a loudspeaker. This multimodal device is well suited for object-based encoding of audio, where audio objects may be rendered at the location corresponding to the visual images. The audio object renderer must be configured to account for variations in panel behavior at different excitation frequencies. This research proposes a multiband crossover network for the audio object renderer that separates the signal for each audio object into low, midrange, and high-frequency bands. Each band is then reproduced on the panel using a different vibration rendering technique. The different rendering techniques are realized by employing a combination of actuator array processing and the natural vibration localization characteristics of point-driven panels. The cutoff frequencies for each band are determined by the physical properties of the panel. Experiments on a prototype panel employing the multiband crossover system demonstrate that the vibration response behaves as predicted in each frequency range. This system provides a platform for rendering spatial audio on devices when listeners are close to the screen, and where there are restrictions related to weight, power consumption, and form-factor.
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