Host communication circuit, client communication circuit, communication system, sound reproducing device and communication method

A client communication circuit that is adapted to be connected to a host communication circuit by means of a clock wire, a selection wire, a first data wire and a second data wire, the client communication circuit being configured

• to receive a digital selection signal over the selection wire from the host communication circuit, the selection signal determining either an audio transmission mode or a client communication mode;
• and
• to receive digital audio data of a first channel and a second channel over the first and the second data wire from the host communication circuit in the audio transmission mode, and to perform bidirectional client communication over the first and the second data wire in the client communication mode.

A communication method for communication between a host side and a client side that are coupled by means of a clock wire, a selection wire, a first data wire and a second data wire, the method comprising

• transmitting, from the host side, a digital selection signal over the selection wire to the client side, the selection signal determining either an audio transmission mode or a client communication mode;
• and
• transmitting digital audio data of a first channel and a second channel over the first and the second data wire from the host side to the client side in the audio transmission mode, and to perform bidirectional client communication between the host side and the client side over the first and the second data wire in the client communication mode.