Communication system, communication apparatus, image reception system, and communication method

1. An image reception system for carrying out two-way wireless data communications of multimedia content between devices, the image reception system comprising:

a child unit; and

a parent unit operable to communicate with the child unit;

the child unit including:

a power switch for turning power to the child unit on/off;

a signal generator operable to issue a power control signal for turning power to the parent unit on/off in response to turning the power switch on/off;

a first data communication unit operable to carry out two-way wireless data communications with the parent unit; and

a secondary display for playing back the multimedia content; and

the parent unit including:

a receiving unit operable to receive the power control signal from the signal generator of the child unit;

a power controller operable to turn power to the parent unit on/off in response to reception of the power control signal from the receiving unit;

a second data communication unit operable to carry out two-way wireless data communications with the child unit; and

a primary display for playing back the multimedia content.

2. The image reception system according to claim 1 , wherein

the signal generator of the child unit includes an interlock switch that is actuated in response to operation of the power switch, and a light emitting unit operable to emit the power control signal as infrared light in response to actuation of the interlock switch; and

the receiving unit of the parent unit includes a light receiving unit operable to receive the power control signal as infrared light from the child unit.

3. The image reception system according to claim 1 , wherein

the signal generator of the child unit includes a determination unit operable to determine whether the power switch of the child unit is turned on or off, and a light emitting unit operable to issue the power control signal as infrared light based on a result of the determination by the determination unit; and

the receiving unit of the parent unit includes a light receiving unit operable to receive the power control signal as infrared light from the child unit.

4. The image reception system according to claim 1 , wherein

the signal generator of the child unit includes a transmitter operable to transmit the power control signal as an electric wave in response to operation of the power switch; and

the receiving unit of the parent unit includes a receiver operable to receive the power control signal as an electric wave from the transmitter of the child unit.

5. The image reception system according to claim 1 , wherein the parent unit further includes a content reception unit operable to receive the multimedia content; and

the power controller of the parent unit is further operable to supply or interrupt a driving voltage to at least the second data communication unit and the content reception unit when the receiving unit receives the power control signal from the child unit.

6. The image reception system according to claim 5 , wherein

the child unit further includes a primary display switch for turning power to the primary display on/off;

the signal generator of the child unit is further operable to issue a primary display power control signal when the primary display switch is turned on/off; and

the power controller of the parent unit is further operable to supply or interrupt a driving voltage to the primary display and to a section that performs processing for the primary display based on the primary display power control signal when the receiving unit receives the primary display power control signal from the signal generator of the child unit.