Patent ID: 8806077

Claim:
A data transmission device, comprising: an acquisition unit which acquires identification information indicating whether or not a data reception device operating by a first digital interface is compatible with a second digital interface other than the first digital interface, the identification information being stored in a storing unit of the data reception device and being acquired via the first digital interface of the data reception device and via the second digital interface of the data transmission device operating by the second digital interface; and a distinction unit which distinguishes whether the data reception device is compatible with the second digital interface based on the identification information acquired by the acquisition unit, wherein the identification information is Enhanced Extended Display Identification Data (E-EDID) stored in the storing unit, the distinction unit (i) distinguishes whether the Enhanced Extended Display Identification Data (E-EDID) is an EDID Data Block Header Byte, (ii) in response to the Enhanced Extended Display Identification Data (E-EDID) being the EDID Data Block Header Byte, distinguishes whether a tag code of a Vendor Specific Data Block (VSDB) described in the EDID Data Block Header Byte is a predetermined value, and (iii) in response to the tag code of the Vendor Specific Data Block (VSDB) being the predetermined value, distinguishes whether the data reception device is compatible with the second digital interface based on a Registration Identifier contained in the Vendor Specific Data Block (VSDB), and the data transmission device transmits differential signals unidirectionally to the data reception device on a single channel during at least one of a horizontal blanking interval or a vertical blanking interval and transmits TMDS clocks inserted into the single channel in a common mode, such that the differential signals and the TMDS clocks are transmitted on the same single channel.