Transmitting apparatus, power supply switching method for transmitting apparatus, receiving apparatus, and power feeding method for receiving apparatus

A receiving apparatus comprising:

• a signal receiving unit that receives a video signal, which is sent over a cable in the form of differential signals on a plurality of channels, from a transmitting apparatus;
• a power obtaining unit that obtains power fed from the transmitting apparatus over the cable;
• a power circuit;
• an information receiving unit that receives request information which is sent from the transmitting apparatus over the cable in order to request feed of power;
• and
• a power feeding unit that feeds power fed from the power circuit to the transmitting apparatus over the cable along with the reception of the request information by the information receiving unit.

A receiving apparatus comprising:

• a signal receiving unit that receives a video signal, which is sent over a cable in the form of differential signals on a plurality of channels, from a transmitting apparatus;
• a power obtaining unit that obtains the power fed from the transmitting apparatus over the cable;
• a power circuit;
• an information receiving unit that receives request information which is sent from the transmitting apparatus over the cable in order to request feed of power;
• and
• a power feeding unit that feeds the power fed from the power circuit to the transmitting apparatus over a first line included in the cable, and that when the request information is received by the information receiving unit, feeds the power fed from the power circuit to the transmitting apparatus over a second line included in the cable.

A power feeding method for a receiving apparatus including a signal receiving unit that receives a video signal, which is sent over a cable in the form of differential signals on a plurality of channels, from a transmitting apparatus, a power obtaining unit that obtains the power fed from the transmitting apparatus over the cable, and a power circuit, comprising:

• a first power feeding step of feeding the power fed from the power circuit to the transmitting apparatus over a first line included in the cable;
• an information receiving step of receiving request information which is sent from the transmitting apparatus over the cable in order to request feed of power;
• and
• a second power feeding step of, while the power fed from the power circuit is fed to the transmitting apparatus over the first line included in the cable, when the request information is received at the information receiving step, feeding the power fed from the power circuit to the transmitting apparatus over a second line included in the cable.

A receiving apparatus comprising:

• a signal receiving unit that receives a video signal, which is sent over a cable in the form of differential signals on a plurality of channels, from a transmitting apparatus;
• a power circuit;
• a power feeding unit that feeds power fed from the power circuit to the transmitting apparatus over a first line included in the cable;
• and
• a power obtaining unit that obtains the power fed from the transmitting apparatus over a second line included in the cable.