INTERFACE CIRCUIT FOR TRANSMITTING AND RECEIVING DIGITAL SIGNALS BETWEEN DEVICES

摘要

A video signal and an audio signal are TMDS transmitted from a source device to a sink device. Through a reserved line and a HPD line provided separately from a TMDS transmission line, an Ethernet™ signal is bidirectionally transmitted, and also, a SPDIF signal is transmitted from the sink device to the source device. The Ethernet™ signal bidirectionally transmitted between Ethernet™ transmitter/receiver circuits is differentially transmitted by an amplifier and is received by the amplifier. The SPDIF signal from a SPDIF transmitter circuit is common-mode transmitted from an adder and is received by the adder to be supplied to the SPDIF receiver circuit.

主权项

1. An output device, comprising:
a first transmitting section for transmitting a first signal as a differential signal to a first external device through a first transmission line; a second transmitting section for transmitting a second signal, being multiplexed to the first transmission line, as a common-mode signal to the first external device; a communication unit for communicating with the first external device via a pair of differential transmission lines included in the first transmission line, the communication unit notifying the first external device of a connection status of its own device by at least one of direct current bias potentials of the pair of differential transmission lines; a receiver for receiving an audio signal from the first external device through a second transmission line; and an analog terminal for outputting the audio signal to a second external device.