Patent ID: 8467742

Claim:
A communications apparatus for communicating with an external apparatus via a wearing body that functions as a transmission medium, the apparatus being worn by the wearing body, the wearing body contacting the external apparatus, the apparatus comprising: an electrode group including at least three electrodes that are held in contact with or in proximity of the wearing body when the apparatus is worn by the wearing body; an electrode selection section configured to designate a plurality of driving electrode pairs, each driving electrode pair being a combination of a first driving electrode and a second driving electrode, the first driving electrode including at least a single electrode included in the electrode group, the second driving electrode including at least a single electrode, which is included in the electrode group but not included in the first driving electrode, designate a driving electrode pair group, which includes at least two driving electrode pairs that have mutually different directional vectors, each directional vector being a vector linking a position of a gravity center of the first driving electrode with a position of a gravity center of the second driving electrode, and select a single driving electrode pair from among the driving electrode pairs included in the driving electrode pair group; and a transmission section configured to transmit a signal to the wearing body via the driving electrode pair selected by the electrode selection section when the apparatus is worn by the wearing body, wherein at least one of the first driving electrode and the second driving electrode constituting the driving electrode pair is constituted by a plurality of electrodes included in the electrode group, the apparatus further comprising: a directionality adjustment section configured to change a directionality of the driving electrode pair group by varying a phase or an amplitude of a signal supplied to the plurality of electrodes constituting the at least one of the first driving electrode and the second driving electrode.