A method and apparatus for notifying a user of an incoming cellular
telephone call are provided. The apparatus includes a cellular telephone
body having at least a back surface, a first transducer positioned within
said cellular telephone body perpendicular to the back surface and adapted
to generate a first acoustic field, and a second transducer positioned
coaxially to the first transducer and adapted to generate a second
acoustic field. A first frequency generator is coupled with the first
transducer to drive the first transducer to generate the first acoustic
field and a second frequency generator is coupled with the second
transducer to drive the second transducer to generate the second acoustic
field in response to an indication that an incoming cellular telephone
call has been received. The first and second acoustic fields overlap. The
overlapping fields generate a vibrational sensation from a difference of
frequency from unequal frequencies generated by the first and second
transducers. The vibration sensation being maintained from the overlapping
fields at a user's tissue, thereby indicating to a user that an incoming
cellular telephone call has been received. A corresponding method for
implementing the apparatus is also provided in accordance with the
invention.
