A pair of sensors are used for detecting an air pressure change signal within an ear of a person caused by the person's initiating action (thought, movement, biological function and/or speech). One of the microphones is placed at least partially within an ear of the person and the other is placed adjacent to and external to the ear, to produce two electrical signals, respectively corresponding to internally detected and to externally detected changes in air pressure. Comparison of the unmodified signal strength difference between these two signals is used to distinguish an initiating action component of each signal from an external source component of each signal. The electrical signals are processed to produce an output signal corresponding to the initiating action, which signal is then recognized by a neural network or speech recognizer, and used for control or communication.
Sensor pair for detecting changes within a human ear and producing a signal corresponding to thought, movement, biological function and/or speech