In all cases where an active sensing tablet or a magnetic field source/sensor pair is used to sense the orientation of the input device, the input device is very expensive. As such, an input device that can sense its orientation without expensive sensing equipment is needed. ...
Using the new technology of E-field sensors disclosed here and supported in previous patent applications, we can replace the telecoil and FM transceiver with a wire antenna on the audio jack or the audio output of the microphone, use an E-fields sensor in the listening device. Even audio ...