Patent ID: 8620133

Claim:
An audio amplifier, comprising: an AV signal acquisition unit that acquires an AV (Audio/Video) signal that includes a video signal and an audio signal; a television connection unit to which a television receiver is connected; a first audio amplifying circuit to which a speaker is connected; and a control unit that determines an output destination of the audio signal of the AV signal acquired by the AV signal acquisition unit, wherein the control unit transmits to the television receiver a command to shut off power for a second audio amplifying circuit of the television receiver when the control unit has determined that the output destination of the audio signal is the first audio amplifying circuit so that the video signal of the AV signal is output from the television connection unit toward the television receiver and the audio signal of the AV signal is input to the first audio amplifying circuit, and the control unit shuts off power for the first audio amplifying circuit when the control unit has determined that the output destination of the audio signal is the second audio amplifying circuit so that the video signal and the audio signal of the AV signal is output from the television connection unit toward the television receiver.