| 摘要 |
To determine a category of a transmission cable easily and at a low cost. A predetermined voltage is applied to a predetermined pin of a receptacle, which has a plurality of pins for connecting a plug of a transmission cable, to determine a category of the transmission cable. A novel HDMI cable has a resistance connected between the predetermined pin and the shield shell of the plug. Upon application of a voltage, it is detected that current flows to decide that the transmission cable is the novel HDMI cable. A current HDMI cable does not have a resistance between the predetermined pin and the shield shell of the plug, and upon application of a voltage, no current flows. |
