Multi-functional electro-acoustic apparatus has a bending wave panel
loudspeaker, an input device (11) forming part of the surface of the bending
wave panel (5), and means (13) for providing force feedback to the
input device. An electro-acoustic transducer (15) attached to the bending
wave panel excites bending waves in the panel to produce an acoustic output. The
panel (5) provides several functions and may be considered to be a hyper-functional
surface (HFS).
