Patent ID: 8902713

Claim:
An electronic device, comprising: a component portion; a hollow pliant structure defining an air chamber therein having a corresponding volume; a driver disposed in the component portion at a first port between the component portion and the hollow pliant structure; a frequency detector disposed in the component portion at a second port between the component portion and the hollow pliant structure; and a control circuit operable with the driver and the frequency detector and configured to: determine a frequency of peak pressure variations in the air chamber with the frequency detector, frequency of peak pressure variations are a function of the corresponding volume and are responsive to signals produced by the driver; correlate the frequency of peak pressure variations determined with a user input; and perform an operation based upon the user input; wherein the frequency of peak pressure variations is proportional to a length of the air chamber defined by a distance through the air chamber from the driver and a point of compression of the hollow pliant structure.