Electronic toy or game playing apparatus

摘要

Electronic toy or game playing apparatus comprises one or more transmit aerials (4) associated with a playing region. One or more playing pieces each contain a transponder (2) and are movable within the playing region. An oscillator (3) provides an input signal to the or each aerial (4) at a predetermined input oscillation frequency. A monitor (5) is provided for simultaneously monitoring the power output by the aerial (4). Each transponder includes a receive area (6) to receive signals from the selected transmit aerial (4) and a circuit (7, 8) which draws power from the transmit aerial (4) in a variable manner thereby modulating the power output by the transmit aerial (4) in the same variable manner, whereby the presence of a piece in the playing region can be determined.